/* 365Lab PDF Toolbox — brand theme */
:root{
  --brand:#2563eb; --brand-600:#1d4ed8; --brand-700:#1e40af;
  --brand-050:#eff4ff; --brand-100:#dbe6ff;
  --accent:#0ea5e9;
  --ink:#0f172a; --ink-2:#334155; --muted:#5c6b82; --faint:#7d8b9f;
  --line:#e2e8f0; --line-2:#cbd5e1;
  --bg:#f8fafc; --surface:#ffffff; --surface-2:#f1f5f9;
  --field:#ffffff; --appbar:rgba(255,255,255,.85);
  --ok:#059669; --warn:#d97706; --err:#dc2626;
  --radius:16px; --radius-sm:10px; --radius-lg:20px;
  --shadow-sm:0 4px 16px rgba(30,41,90,.06);
  --shadow:0 14px 38px rgba(30,41,90,.08);
  --shadow-lg:0 20px 50px rgba(30,64,175,.18);
  --maxw:1200px;
  --grad-brand:linear-gradient(135deg,#2563eb 0%,#0ea5e9 100%);
  --grad-top:linear-gradient(90deg,#2563eb,#0ea5e9,#22d3ee);
  /* type scale — unified heading rhythm (R14) */
  --fs-hero:clamp(28px,4.6vw,44px);
  --fs-h1:clamp(22px,3vw,28px);
  --fs-h2:clamp(20px,2.6vw,24px);
  --fs-h3:16.5px;
  --fs-lead:15px;
}
/* ---------- Dark theme (manual override, set by head inline script via data-theme) ---------- */
:root[data-theme="dark"]{
  --brand-050:#172554; --brand-100:#1e3a8a;
  /* 文字/图标用的品牌色：暗色下必须提亮，否则深蓝压深蓝（实测 2.59:1） */
  --brand-600:#7db3ff; --brand-700:#93c5fd;
  --ink:#e5eaf3; --ink-2:#c3cddb; --muted:#99a6b8; --faint:#6b7889;
  --line:#1c2a44; --line-2:#2a3b5e;
  --bg:#0a0f1c; --surface:#101a2e; --surface-2:#18263f;
  --field:#1b2a47; --appbar:rgba(10,15,28,.8);
  --shadow-lg:0 18px 48px rgba(0,0,0,.5);
  --shadow:0 6px 20px rgba(0,0,0,.35),0 2px 6px rgba(0,0,0,.25);
  --shadow-sm:0 1px 2px rgba(0,0,0,.3),0 1px 3px rgba(0,0,0,.35);
  color-scheme:dark;
}
/* `color-scheme` must be declared for the LIGHT state too. Without it the value stays
   `normal`, which lets the OS preference win — so a user on a dark OS who selects this
   site's light theme would still get dark native scrollbars / selects / colour pickers.
   Declaring both keeps native UI chrome in lockstep with the chosen theme. */
:root[data-theme="light"]{color-scheme:light}
/* Refined, theme-aware scrollbars. Standard properties (not ::-webkit-* pseudo elements)
   so they inherit into every scroll container and re-use the theme tokens. */
:root{scrollbar-width:thin;scrollbar-color:var(--line-2) transparent}
:root[data-theme="dark"] .site-footer{background:#0b1424;color:#c3cddb;border-top-color:#1c2a44}
:root[data-theme="dark"] .site-footer h4{color:#e5eaf3}
:root[data-theme="dark"] .site-footer a{color:#99a6b8}
:root[data-theme="dark"] .site-footer a:hover{color:#7db3ff}
:root[data-theme="dark"] .foot-desc{color:#99a6b8}
:root[data-theme="dark"] .foot-bottom{color:#6b7889;border-top-color:#1c2a44}
:root[data-theme="dark"] .site-header{background:var(--appbar)}
:root[data-theme="dark"] .tool-hero{background:
  radial-gradient(700px 300px at 90% -20%,rgba(37,99,235,.22),transparent 60%),
  linear-gradient(180deg,#111c33,var(--bg))}
:root[data-theme="dark"] .notice.warn{background:rgba(217,119,6,.12);border-color:#7c4a12;border-left-color:#f59e0b;color:#fbbf24}
:root[data-theme="dark"] .faq summary::after{border-color:#99a6b8}
:root[data-theme="dark"] .faq details[open]{background:rgba(37,99,235,.12)}
:root[data-theme="dark"] .faq summary:hover{color:#7db3ff}
:root[data-theme="dark"] .faq summary:hover::after{border-color:#7db3ff}
:root[data-theme="dark"] .drop.over{box-shadow:0 0 0 4px rgba(37,99,235,.35),var(--shadow-sm)}
:root[data-theme="dark"] .badges span{background:#0e1a30;border-color:#1c2a44;color:#c3cddb}
:root[data-theme="dark"] .badges span:hover{background:rgba(37,99,235,.14);border-color:rgba(125,179,255,.45);color:#7db3ff}
:root[data-theme="dark"] .skip{background:#101a2e;color:#7db3ff}
*{box-sizing:border-box}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-9999px;top:0;z-index:2000;background:var(--surface);color:var(--brand-700);padding:10px 16px;border-radius:0 0 10px 0;box-shadow:var(--shadow);font-weight:700}
.skip:focus{left:0;top:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{animation-duration:.001ms!important;transition-duration:.001ms!important}}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
body::before{content:"";position:fixed;top:0;left:0;right:0;height:4px;background:var(--grad-top);z-index:1000}
a{color:var(--brand-600);text-decoration:none}
a:hover{color:var(--brand-700)}
img,svg{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:900;background:var(--appbar);backdrop-filter:saturate(180%) blur(12px);box-shadow:none;border-bottom:1px solid transparent;transition:box-shadow .25s ease,border-color .25s ease}
.nav{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);font-size:18px;letter-spacing:-.2px}
.brand:hover{color:var(--ink)}
.brand .logo{width:34px;height:34px;flex:0 0 auto;border-radius:9px;background:var(--grad-brand);display:grid;place-items:center;color:#fff;box-shadow:var(--shadow-sm)}
.brand .logo svg{width:20px;height:20px}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.2px;margin-top:-3px}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{color:var(--ink-2);font-weight:600;font-size:14.5px;padding:8px 12px;border-radius:9px}
.nav-links a:hover{background:var(--brand-050);color:var(--brand-700)}
.nav-tools-menu{position:relative}
.nav-actions{display:flex;align-items:center;gap:10px}
.lang-btn,.theme-btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line-2);background:var(--field);color:var(--ink-2);font-weight:700;font-size:13px;padding:7px 12px;border-radius:10px;cursor:pointer;min-height:40px;transition:border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease}
.lang-btn:hover,.theme-btn:hover{border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700);box-shadow:var(--shadow-sm)}
.lang-btn:active,.theme-btn:active{transform:translateY(1px)}
.lang-btn svg,.theme-btn svg{width:15px;height:15px}
.menu-toggle{display:none;border:1px solid var(--line-2);background:var(--field);border-radius:9px;width:40px;height:40px;cursor:pointer;place-items:center}
.menu-toggle svg{width:22px;height:22px;color:var(--ink-2)}
.nav-mobile{display:none}

/* ---------- Header search (icon toggle → centered popup modal) ---------- */
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--line-2);background:var(--field);color:var(--ink-2);border-radius:10px;cursor:pointer;transition:border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease,transform .15s ease}
.icon-btn:hover{border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700);box-shadow:var(--shadow-sm)}
.icon-btn:active{transform:translateY(1px)}
.icon-btn:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}
.icon-btn svg{width:18px;height:18px}
.icon-btn[aria-expanded="true"]{background:var(--brand-600);border-color:var(--brand-600);color:#fff;box-shadow:0 6px 16px -4px rgba(37,99,235,.5)}

/* overlay + modal */
.search-overlay{position:fixed;inset:0;z-index:1000;display:flex;justify-content:center;align-items:flex-start;padding:9vh 16px 16px;background:rgba(15,23,42,.5);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);animation:searchOverlayIn .18s ease}
.search-overlay[hidden]{display:none}
.search-panel{position:relative;width:100%;max-width:680px;background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:0 32px 80px -24px rgba(15,23,42,.55);padding:18px;animation:searchPanelIn .22s cubic-bezier(.2,.7,.3,1)}
@keyframes searchOverlayIn{from{opacity:0}to{opacity:1}}
@keyframes searchPanelIn{from{opacity:0;transform:translateY(-12px) scale(.985)}to{opacity:1;transform:none}}
body.search-open{overflow:hidden}

/* search box (refined, thin border) */
.search-box{position:relative;display:flex;align-items:center;gap:12px;background:var(--field);border:1px solid var(--line-2);border-radius:12px;padding:0 14px 0 18px;height:52px;transition:border-color .18s ease,box-shadow .18s ease}
.search-box:hover{border-color:var(--brand-100)}
.search-box:focus-within{border-color:var(--brand)}
.search-box>svg{flex:0 0 auto;width:21px;height:21px;color:var(--brand-600);transition:color .18s ease}
.search-box:focus-within>svg{color:var(--brand-700)}
.search-box input{flex:1 1 auto;min-width:0;border:0;outline:0;background:transparent;color:var(--ink);font-size:16px;font-weight:500;height:100%}
.search-box input::placeholder{color:var(--muted);font-weight:400}
/* placeholder 对比度：暗色下浏览器默认/--faint 仅 ~3.2–3.4:1，低于 WCAG AA 4.5；
   统一用 --muted（暗 #99a6b8≈5.86:1 / 亮 #5c6b82≈5.31:1），双主题均达标 */
input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}
.search-box input::-webkit-search-cancel-button,.search-box input::-webkit-search-decoration{-webkit-appearance:none;appearance:none;display:none}
.search-clear{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border:0;background:var(--surface-2);color:var(--muted);border-radius:9px;cursor:pointer;transition:background .15s ease,color .15s ease,transform .15s ease}
.search-clear:hover{background:var(--brand-050);color:var(--brand-700)}
.search-clear:active{transform:scale(.94)}
.search-clear svg{width:15px;height:15px}

/* top row: search box + close button */
.search-top{width:100%;margin-top:30px}
.search-close{position:absolute;top:12px;right:12px;width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line-2);background:var(--field);color:var(--ink-2);border-radius:10px;cursor:pointer;transition:border-color .15s ease,background .15s ease,color .15s ease}
.search-close:hover{border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700)}
.search-close:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}
.search-close svg{width:20px;height:20px}

.search-pop{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:16px}
.search-pop[hidden]{display:none}
.sp-label{flex:0 0 auto;font-size:12px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;color:var(--muted)}
.sp-chips{display:flex;flex-wrap:wrap;gap:8px}
.sp-chip{display:inline-flex;align-items:center;gap:7px;background:var(--surface);border:1px solid var(--line-2);color:var(--ink-2);font-weight:700;font-size:13px;padding:7px 13px 7px 9px;border-radius:999px;cursor:pointer;text-decoration:none;transition:border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease,transform .15s ease}
.sp-chip:hover{border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700);box-shadow:var(--shadow-sm);transform:translateY(-1px)}
.sp-chip:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}
.sp-chip .ic{flex:0 0 auto;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;color:#fff}
.sp-chip .ic svg{width:13px;height:13px}
.search-results{margin-top:14px;display:grid;gap:4px;max-height:min(56vh,440px);overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain}
.search-results[hidden]{display:none}
.sr-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:12px;border:1px solid transparent;cursor:pointer;color:var(--ink-2);text-decoration:none;transition:background .14s ease,border-color .14s ease,transform .14s ease}
.sr-item:hover,.sr-item.active{background:var(--brand-050);border-color:var(--brand-100);transform:translateX(2px)}
.sr-item:focus-visible{outline:2px solid var(--brand-600);outline-offset:-2px}
.sr-item .ic{flex:0 0 auto;width:36px;height:36px;border-radius:10px;display:grid;place-items:center;color:#fff;box-shadow:var(--shadow-sm)}
.sr-item .ic svg{width:17px;height:17px}
.sr-item .sr-meta{flex:1 1 auto;min-width:0}
.sr-item .sr-name{font-weight:700;font-size:14.5px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sr-item.active .sr-name,.sr-item:hover .sr-name{color:var(--brand-700)}
.sr-item .sr-cat{font-size:12px;color:var(--muted);display:inline-flex;align-items:center;gap:6px}
.sr-item .sr-dot{width:7px;height:7px;border-radius:50%;flex:0 0 auto}
.sr-item .sr-en{color:var(--faint);font-size:12px;margin-left:6px;font-weight:500}
.sr-item::after{content:"\2192";margin-left:8px;flex:0 0 auto;color:var(--brand-600);font-weight:800;opacity:0;transform:translateX(-4px);transition:opacity .14s ease,transform .14s ease}
.sr-item:hover::after,.sr-item.active::after{opacity:1;transform:translateX(0)}
.sr-empty{margin-top:14px;padding:22px 12px;color:var(--muted);font-size:14px;text-align:center;background:var(--surface-2);border-radius:12px}
.search-hint{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:16px 2px 0;color:var(--faint);font-size:12.5px}
.search-hint[hidden]{display:none}
.sh-keys{display:inline-flex;align-items:center;gap:6px;margin-left:auto}
.sh-keys kbd{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 6px;background:var(--surface-2);border:1px solid var(--line-2);border-bottom-width:2px;border-radius:6px;font-family:inherit;font-size:11px;font-weight:700;color:var(--muted);white-space:nowrap}
.sh-keys kbd.sh-open{color:var(--brand);border-color:rgba(37,99,235,.35);background:rgba(37,99,235,.10)}
.m-search .search-box{height:46px}
.m-search .search-box input{font-size:15px}
.m-search .search-results{max-height:40vh}
:root[data-theme="dark"] .icon-btn{border-color:#243a5e;background:#13233c;color:#cdd9ee}
:root[data-theme="dark"] .icon-btn:hover{border-color:#2f4f7e;background:#18283f;color:#fff}
:root[data-theme="dark"] .icon-btn[aria-expanded="true"]{background:var(--brand);border-color:var(--brand);color:#fff}
:root[data-theme="dark"] .search-overlay{background:rgba(0,0,0,.55)}
:root[data-theme="dark"] .search-panel{background:#0e1726;border-color:#1c2a44;box-shadow:0 32px 80px -24px rgba(0,0,0,.6)}
:root[data-theme="dark"] .search-box{background:#0d1828;border-color:#243a5e}
:root[data-theme="dark"] .search-box:hover{border-color:#2f4f7e}
:root[data-theme="dark"] .search-box:focus-within{border-color:#3b82f6}
:root[data-theme="dark"] .search-box>svg{color:#7db3ff}
:root[data-theme="dark"] .search-close{background:#0d1828;border-color:#243a5e;color:#cdd9ee}
:root[data-theme="dark"] .search-close:hover{background:#18283f;color:#fff}
:root[data-theme="dark"] .search-clear{background:#18283f;color:#9fb2cc}
:root[data-theme="dark"] .search-clear:hover{background:#243a5e;color:#fff}
:root[data-theme="dark"] .sp-chip{background:#101a2e;border-color:#243a5e;color:#c3cddb}
:root[data-theme="dark"] .sp-chip:hover{background:#15243a;border-color:#2f4f7e;color:#fff}
:root[data-theme="dark"] .sp-label{color:#99a6b8}
:root[data-theme="dark"] .sr-item:hover,:root[data-theme="dark"] .sr-item.active{background:#15243a;border-color:#243a5e}
:root[data-theme="dark"] .sr-item .sr-name{color:#e8eefc}
:root[data-theme="dark"] .sr-empty{background:#0d1828;color:#99a6b8}
:root[data-theme="dark"] .sh-keys kbd{background:#0d1828;border-color:#243a5e;color:#9fb2cc}
:root[data-theme="dark"] .sh-keys kbd.sh-open{color:#7aa2ff;border-color:rgba(122,162,255,.45);background:rgba(37,99,235,.22)}
@media(prefers-reduced-motion:reduce){.search-overlay,.search-panel{animation:none}}

/* tools dropdown */
.dropdown{position:absolute;top:calc(100% + 8px);right:0;width:min(720px,90vw);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:18px;display:none;z-index:950;max-height:min(70vh,560px);overflow-y:auto;overscroll-behavior:contain}
.nav-tools-menu:hover .dropdown,.nav-tools-menu.open .dropdown{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.dropdown a{display:flex;align-items:center;gap:9px;padding:9px 10px;border-radius:10px;color:var(--ink-2);font-weight:600;font-size:13.5px}
.dropdown a:hover{background:var(--brand-050);color:var(--brand-700)}
.dropdown .ic{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;color:#fff;flex:0 0 auto;font-size:15px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:15px;padding:12px 20px;border-radius:11px;border:1px solid transparent;cursor:pointer;transition:.15s;line-height:1.2;text-align:center}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--grad-brand);color:#fff;box-shadow:0 6px 18px rgba(37,99,235,.28);transition:transform .15s ease,box-shadow .15s ease,filter .15s ease}
.btn-primary:hover{filter:brightness(1.06);color:#fff;transform:translateY(-2px);box-shadow:0 10px 26px rgba(37,99,235,.34)}
.btn-primary:active{transform:translateY(0);filter:brightness(.98)}
.btn-ghost{background:var(--field);border-color:var(--line-2);color:var(--ink-2)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-700);background:var(--brand-050)}
.btn-block{width:100%}
.btn-lg{padding:15px 26px;font-size:16px;border-radius:13px}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;filter:none}
.btn-sm{padding:8px 12px;font-size:13px;border-radius:9px}

/* ---------- Hero (landing) ---------- */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1100px 420px at 86% -14%,rgba(37,99,235,.16),transparent 62%),
  radial-gradient(900px 380px at 6% 0%,rgba(14,165,233,.14),transparent 58%);
  padding:56px 0 44px}
.hero-inner{display:flex;flex-direction:column;align-items:flex-start;text-align:left;gap:16px}
.hero h1{font-size:var(--fs-hero);line-height:1.12;margin:0;font-weight:900;letter-spacing:-1px}
.hero h1 .g{background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{font-size:clamp(16px,2.2vw,19px);color:var(--muted);max-width:720px;margin:0}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin-top:6px}
.badges{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-start;margin-top:12px}
.badges span{display:inline-flex;align-items:center;gap:7px;background:var(--surface);border:1px solid var(--line);color:var(--ink-2);font-weight:700;font-size:13px;padding:7px 14px;border-radius:999px;box-shadow:var(--shadow-sm);white-space:nowrap;transition:border-color .15s ease,color .15s ease,box-shadow .15s ease,background-color .15s ease}
.badges span:hover{border-color:var(--brand-100);color:var(--brand-700);background:var(--brand-050);box-shadow:var(--shadow)}
.badges svg{width:16px;height:16px;color:var(--brand-600);flex:0 0 auto}

/* search */
.search-wrap{position:relative;width:min(560px,100%);margin-top:6px}
.search-wrap svg.s-ic{position:absolute;left:16px;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--faint)}

/* ---------- Section ---------- */
.section{padding:56px 0}
.section-head{text-align:left;margin-bottom:32px}
.section-head h2{position:relative;padding-left:15px;font-size:var(--fs-h2);margin:0;font-weight:800;letter-spacing:-.4px;scroll-margin-top:84px}
.section-head h2::before{content:"";position:absolute;left:0;top:5px;bottom:5px;width:5px;border-radius:5px;background:var(--grad-brand)}
.section-head p{color:var(--muted);margin:8px 0 0;max-width:680px}
.eyebrow{display:inline-block;font-size:12.5px;font-weight:800;letter-spacing:1px;text-transform:uppercase;color:var(--brand-600);background:var(--brand-050);padding:5px 12px;border-radius:999px;margin-bottom:12px}

/* ---------- Tool grid ---------- */
.cat-bar{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-start;position:sticky;top:64px;z-index:60;margin:0 0 24px;padding:10px 12px;background:var(--appbar);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 26px rgba(30,41,90,.07)}
.cat-chip{border:1px solid var(--line-2);background:var(--field);color:var(--ink-2);font-weight:700;font-size:13.5px;padding:8px 15px;border-radius:999px;cursor:pointer;transition:border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease}
.cat-chip:hover{border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700)}
.cat-chip.active{background:var(--grad-brand);border-color:transparent;color:#fff;box-shadow:0 4px 12px rgba(37,99,235,.28)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:18px}
.tool-card{position:relative;display:flex;flex-direction:column;gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 18px 18px;overflow:hidden;color:var(--ink);box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,background .2s ease}
.tool-card::before{content:none}
/* 卡片顶部 4px 强调长条已按需求移除（取消所有卡片上方横线）；保留下方 ::after 淡色晕染 */
.tool-card::after{content:"";position:absolute;inset:0 0 auto 0;height:72%;background:linear-gradient(180deg,var(--card-tint,rgba(37,99,235,.06)),transparent);pointer-events:none}
.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg),0 10px 30px rgba(37,99,235,.18);border-color:var(--brand-100);background:var(--surface)}
.tool-card .ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;color:#fff;background:var(--card-accent,var(--grad-brand));box-shadow:var(--shadow-sm);z-index:1;transition:transform .2s ease,box-shadow .2s ease;position:relative;overflow:hidden}
.tool-card .ic::after{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(135deg,rgba(255,255,255,.38),rgba(255,255,255,0) 52%);pointer-events:none}
.tool-card:hover .ic{transform:scale(1.07);box-shadow:var(--shadow)}
.tool-card .ic svg{width:23px;height:23px}
.tool-card h3{margin:0;font-size:var(--fs-h3);font-weight:800;z-index:1}
.tool-card p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.5;z-index:1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;word-break:break-word}
.tool-card .go{margin-top:auto;color:var(--brand-600);font-weight:700;font-size:13px;display:inline-flex;align-items:center;gap:5px;z-index:1;transition:gap .15s ease}
.tool-card:hover .go{gap:8px}

/* tools collection page — restyled to match txt.365lab.top aesthetic */
.tools-page .cat-bar{margin-bottom:22px;box-shadow:0 12px 30px rgba(30,41,90,.09)}
.tools-page .cat-chip{text-decoration:none;display:inline-flex;align-items:center}
.tools-lead{max-width:760px;margin:6px auto 34px;text-align:center;color:var(--muted);font-size:14.5px;line-height:1.7}
.tool-group{margin-bottom:40px;padding-top:6px}
.tool-group:first-of-type{margin-top:0}
.tool-group:last-child{margin-bottom:0}
.group-head{display:flex;align-items:center;gap:12px;margin:0 0 18px}
.group-head h2{position:relative;padding-left:15px;margin:0;font-size:clamp(19px,2.4vw,21px);font-weight:800;letter-spacing:-.3px;display:flex;align-items:center;gap:8px;scroll-margin-top:84px}
.group-head h2::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:5px;border-radius:5px;background:var(--grad-brand)}
.sh-emoji{font-size:.95em;line-height:1;filter:drop-shadow(0 1px 1px rgba(15,23,42,.08))}
.group-head .count{margin-left:auto;background:var(--surface-2);color:var(--muted);padding:3px 11px;border-radius:12px;font-size:12px;font-weight:700;border:1px solid var(--line)}
.tools-page .grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}

/* ---------- Pagination (25 cards / page = 5 rows × 5 cols) ---------- */
.pager{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:30px 0 6px}
.pager[hidden]{display:none!important}
.pg{min-width:38px;height:38px;padding:0 10px;border:1px solid var(--line-2);background:var(--surface);color:var(--ink-2);font-weight:700;font-size:14px;border-radius:10px;cursor:pointer;transition:border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease}
.pg:hover:not(:disabled){border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700)}
.pg.active{background:var(--grad-brand);border-color:transparent;color:#fff;box-shadow:0 4px 12px rgba(37,99,235,.28)}
.pg:disabled{opacity:.45;cursor:not-allowed}
@media (max-width:480px){.pg{min-width:34px;height:34px;font-size:13px}}

/* recent */
.recent{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.recent a{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-weight:700;font-size:13.5px;color:var(--ink-2);transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease,background .15s ease}
.recent a:hover{transform:translateY(-2px);border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700);box-shadow:var(--shadow-sm)}
.recent a .ic{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;color:#fff;flex:0 0 auto}
.recent a .ic svg{width:16px;height:16px}

/* feature strip */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feature{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow),0 10px 30px rgba(37,99,235,.16);border-color:var(--brand-100)}
.feature .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;background:var(--brand-050);color:var(--brand-600);margin-bottom:14px}
.feature .ic svg{width:24px;height:24px}
.feature h3{margin:0 0 6px;font-size:var(--fs-h3);font-weight:800}
.feature p{margin:0;color:var(--muted);font-size:14px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;position:relative;counter-reset:st}
.step{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px 24px;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;overflow:hidden}
.step::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--grad-brand);opacity:0;transition:opacity .18s ease}
.step:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg),0 10px 30px rgba(37,99,235,.18);border-color:var(--brand-100)}
.step:hover::before{opacity:1}
.step .n{width:44px;height:44px;border-radius:13px;background:var(--grad-brand);color:#fff;font-weight:800;font-size:18px;display:grid;place-items:center;margin-bottom:16px;box-shadow:0 8px 18px rgba(37,99,235,.28)}
.step h3{margin:0 0 7px;font-size:var(--fs-h3);font-weight:800;letter-spacing:-.2px}
.step p{margin:0;color:var(--muted);font-size:14px;line-height:1.6}
.steps-n2,.steps-n4{grid-template-columns:repeat(2,1fr)}
@media (min-width:900px){
  .steps{gap:36px}
  .step::after{content:"";position:absolute;top:50px;left:100%;width:36px;height:2px;background:linear-gradient(90deg,var(--line-2),transparent);transform:translateX(-100%)}
  .step:last-child::after{display:none}
}

/* faq */
.faq{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:0 18px;overflow:hidden;transition:border-color .15s,box-shadow .15s}
.faq details[open]{border-color:var(--line-2);box-shadow:var(--shadow-sm);background:var(--brand-050)}
.faq summary{cursor:pointer;font-weight:700;font-size:15.5px;padding:16px 0;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--ink);border-radius:8px;transition:color .15s ease}
.faq summary:hover{color:var(--brand-700)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";width:12px;height:12px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .25s ease,border-color .15s ease;flex:0 0 auto}
.faq summary:hover::after{border-color:var(--brand-700)}
.faq details[open] summary::after{transform:rotate(-135deg)}
.faq .a{padding:0 0 18px;color:var(--ink-2);font-size:14.5px;line-height:1.7}

/* FAQ page (dedicated /faq/) */
.faq-cats>h2{margin-top:34px}
.faq-cats>h2:first-child{margin-top:4px}
.faq-cats .faq{max-width:none;margin:0}

/* ---------- Footer ---------- */
.site-footer{background:#f6f7fb;color:var(--ink-2);margin-top:20px;border-top:1px solid var(--line);position:relative}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad-top)}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px;padding:46px 0 30px}
.site-footer h4{color:var(--ink);font-size:14px;margin:0 0 16px;letter-spacing:.3px;position:relative;padding-bottom:9px}
.site-footer h4::after{content:"";position:absolute;left:0;bottom:0;width:22px;height:2px;border-radius:2px;background:var(--grad-brand);opacity:.75}
.site-footer a{color:var(--muted);display:block;font-size:13.5px;padding:6px 0;transition:color .15s ease,transform .15s ease}
.site-footer a:hover{color:var(--brand-700);transform:translateX(3px)}
.foot-brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;font-size:18px;margin-bottom:12px}
.foot-brand .logo{width:32px;height:32px;border-radius:8px;background:var(--grad-brand);display:grid;place-items:center}
.foot-brand .logo svg{width:18px;height:18px}
.foot-desc{font-size:13.5px;color:var(--muted);max-width:340px}
.foot-bottom{border-top:1px solid var(--line-2);padding:18px 0;font-size:13px;color:var(--faint);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- Tool page ---------- */
.tool-hero{background:
  radial-gradient(900px 360px at 88% -30%,rgba(37,99,235,.16),transparent 60%),
  radial-gradient(800px 320px at 8% -10%,rgba(14,165,233,.14),transparent 58%);
  border-bottom:1px solid var(--line);padding:28px 0 22px;position:relative;overflow:hidden}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px;display:inline-flex;gap:7px;flex-wrap:wrap;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px 14px;box-shadow:var(--shadow-sm)}
.crumbs a{color:var(--muted);text-decoration:none;padding:3px 7px;border-radius:6px;transition:color .15s ease}
.crumbs a:hover{color:var(--brand-600);text-decoration:underline;text-underline-offset:2px}
.crumb-sep{opacity:.55;color:var(--line-2)}
.crumbs span:last-child{color:var(--brand-600);font-weight:800}
.tool-hero-in{display:flex;align-items:center;gap:16px;min-width:0}
.tool-hero-in>div{min-width:0;flex:1 1 auto}
.tool-hero .tic{width:56px;height:56px;border-radius:15px;background:var(--grad-brand);display:grid;place-items:center;color:#fff;flex:0 0 auto;box-shadow:var(--shadow)}
.tool-hero .tic svg{width:28px;height:28px}
.tool-hero h1{margin:0;font-size:var(--fs-h1);font-weight:900;letter-spacing:-.4px}
.tool-hero .lead{margin:4px 0 0;color:var(--ink-2);font-size:var(--fs-lead);max-width:760px}
/* R65: unify individual tool-hero with the brand depth + title signature used by .hero and .tool-hero--index */
.tool-hero::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.9;background-image:radial-gradient(rgba(37,99,235,.13) 1px,transparent 1.6px);background-size:22px 22px;mask-image:radial-gradient(700px 300px at 80% 0%,#000,transparent 72%);-webkit-mask-image:radial-gradient(700px 300px at 80% 0%,#000,transparent 72%)}
.tool-hero .container{position:relative;z-index:1}
.tool-hero h1{position:relative;padding-bottom:13px}
.tool-hero h1::after{content:"";position:absolute;left:0;bottom:0;width:58px;height:4px;border-radius:99px;background:var(--grad-brand)}
:root[data-theme="dark"] .tool-hero::before{background-image:radial-gradient(rgba(120,170,255,.20) 1px,transparent 1.6px)}
.hero-badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:13px}
.hero-badges .hb{display:inline-flex;align-items:center;gap:6px;background:var(--surface);border:1px solid var(--line);color:var(--ink-2);font-size:12.5px;font-weight:700;padding:6px 12px;border-radius:999px;box-shadow:var(--shadow-sm);white-space:nowrap}
.hero-badges .hb svg{width:13px;height:13px;color:var(--brand-600);flex:0 0 auto}
@media (max-width:820px){
  .hero-badges{flex-wrap:nowrap;overflow-x:auto;margin-top:10px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .hero-badges::-webkit-scrollbar{display:none}
  .hero-badges .hb{flex:0 0 auto;font-size:12px;padding:5px 10px}
}

/* ===== Tool-index hero（「全部工具」页头部）: 卡片化 + 点阵纹理 + 渐变强调条 ===== */
.tool-hero--index{position:relative;overflow:hidden;border-bottom:0;padding:24px 0 10px;
  background:radial-gradient(900px 340px at 86% -34%,rgba(37,99,235,.11),transparent 62%),
             linear-gradient(180deg,rgba(14,165,233,.05),transparent 76%)}
.tool-hero--index .container{position:relative;z-index:1}
.tool-hero--index::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.9;
  background-image:radial-gradient(rgba(37,99,235,.13) 1px,transparent 1.6px);background-size:22px 22px;
  mask-image:radial-gradient(700px 300px at 80% 0%,#000,transparent 72%);
  -webkit-mask-image:radial-gradient(700px 300px at 80% 0%,#000,transparent 72%)}
.tool-hero--index .tool-hero-in{align-items:flex-start;position:relative;overflow:hidden;
  background:linear-gradient(135deg,rgba(37,99,235,.10),rgba(14,165,233,.045) 46%,var(--surface) 86%);
  border:1px solid var(--line);border-radius:20px;padding:24px 26px 22px;box-shadow:var(--shadow-sm)}
.tool-hero--index .tool-hero-in::after{content:"";position:absolute;right:-80px;top:-100px;width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,rgba(37,99,235,.20),transparent 66%);pointer-events:none}
.tool-hero--index .tool-hero-in>div{position:relative;z-index:1}
.tool-hero--index h1{position:relative;padding-bottom:13px}
.tool-hero--index h1::after{content:"";position:absolute;left:0;bottom:0;width:58px;height:4px;border-radius:99px;background:var(--grad-brand)}
.tool-hero--index .sub{margin:13px 0 0;color:var(--ink-2);font-size:15px;line-height:1.7;max-width:780px}
.tool-hero--index .hero-badges{margin-top:16px}
:root[data-theme="dark"] .tool-hero--index{background:radial-gradient(760px 300px at 88% -24%,rgba(37,99,235,.24),transparent 62%)}
:root[data-theme="dark"] .tool-hero--index::before{background-image:radial-gradient(rgba(120,170,255,.20) 1px,transparent 1.6px)}
:root[data-theme="dark"] .tool-hero--index .tool-hero-in{background:linear-gradient(135deg,rgba(37,99,235,.22),rgba(14,165,233,.07) 48%,var(--surface) 88%);border-color:#243a5e}
@media (max-width:820px){.tool-hero--index .hero-badges{flex-wrap:wrap;overflow:visible;margin-top:14px}.tool-hero--index .hero-badges .hb{white-space:normal}}
@media (max-width:600px){.tool-hero--index .tool-hero-in{padding:20px 18px 18px;border-radius:16px}.tool-hero--index h1::after{width:46px}}

/* tool page SEO copy — features & tips */
.sec-about{background:linear-gradient(180deg,var(--surface),var(--bg))}
/* tool-page SEO copy: match work-area width + coordinate headings with hero (left-aligned) */
.sec-about .container{max-width:var(--maxw)}
.sec-how .section-head,.sec-faq .section-head,.sec-rel .section-head{text-align:left;margin-bottom:30px}
.sec-how .section-head p,.sec-faq .section-head p,.sec-rel .section-head p{margin:8px 0 0;max-width:720px}
.about-p{font-size:15.5px;line-height:1.85;color:var(--ink-2);max-width:760px}
.sec-h-ic{display:inline-grid;place-items:center;width:29px;height:29px;border-radius:8px;background:var(--brand-050);color:var(--brand-600);vertical-align:-7px;margin-right:9px}
.sec-h-ic svg{width:16px;height:16px}
.section-head .sec-h-ic{width:34px;height:34px;border-radius:9px;vertical-align:-9px;box-shadow:var(--shadow-sm)}
.section-head .sec-h-ic svg{width:18px;height:18px}
.feat-list{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.feat-item{display:flex;gap:11px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 15px;box-shadow:var(--shadow-sm);transition:transform .15s,box-shadow .15s}
.feat-item:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.feat-item .fi-ic{width:26px;height:26px;flex:0 0 auto;border-radius:8px;background:var(--brand-050);color:var(--brand-600);display:grid;place-items:center}
.feat-item .fi-ic svg{width:15px;height:15px}
.feat-item h3{margin:0 0 3px;font-size:14px;font-weight:800;color:var(--ink)}
.feat-item p{margin:0;font-size:13px;line-height:1.55;color:var(--muted)}
.tip-list{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tip-list>.tip-item:last-child:nth-child(odd){grid-column:1/-1}
.tip-item{display:flex;gap:10px;align-items:flex-start;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;font-size:13.5px;line-height:1.6;color:var(--ink-2)}
.tip-item svg{width:16px;height:16px;flex:0 0 auto;color:var(--warn);margin-top:2px}
.tip-item span{min-width:0}
.sec-how{background:linear-gradient(180deg,var(--bg),var(--brand-050))}
.sec-faq{background:var(--bg)}
.sec-rel{background:linear-gradient(180deg,var(--surface),var(--bg))}
.sec-rel .section-head{margin-bottom:24px}
.sec-rel{padding-top:8px}
/* R66: 工具页内容四区块与首页统一的发丝渐变分隔线，统一区块节奏语言 */
.sec-how,.sec-faq,.sec-rel{position:relative}
.sec-how::before,.sec-faq::before,.sec-rel::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--line) 16%,var(--line) 84%,transparent);pointer-events:none}
@media (max-width:820px){.feat-list{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.feat-list,.tip-list{grid-template-columns:1fr}}

.workwrap{padding:28px 0 8px}
/* Reserve vertical space for the JS-mounted tool UI (#mount starts empty) to prevent a layout-shift (CLS) that pushes the sections below it down on load. */
#mount{min-height:520px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:24px}
.drop{border:2px dashed var(--line-2);border-radius:var(--radius);padding:40px 24px;text-align:center;background:var(--surface-2);cursor:pointer;transition:border-color .15s,background .15s,box-shadow .15s,transform .15s}
.drop:hover{border-color:var(--brand);background:var(--brand-050)}
.drop.over{border-color:var(--brand);background:var(--brand-050);box-shadow:0 0 0 4px var(--brand-100),var(--shadow-sm);transform:translateY(-2px)}
.drop .dic{width:54px;height:54px;border-radius:14px;background:var(--field);box-shadow:var(--shadow-sm);display:grid;place-items:center;margin:0 auto 14px;color:var(--brand)}
.drop .dic svg{width:26px;height:26px}
.drop h4{margin:0 0 4px;font-size:16px;font-weight:800}
.drop p{margin:0;color:var(--muted);font-size:13.5px}

.file-list{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}
.file-row{display:flex;align-items:center;gap:12px;background:var(--surface-2);border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.file-row .fi{width:38px;height:38px;border-radius:9px;background:var(--brand-050);color:var(--brand-600);display:grid;place-items:center;flex:0 0 auto}
.file-row .fi svg{width:20px;height:20px}
.file-row .fm{min-width:0;flex:1}
.file-row .fn{font-weight:700;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-row .fs{font-size:12px;color:var(--muted)}
.file-row .up,.file-row .rm{border:1px solid var(--line-2);background:var(--field);border-radius:8px;width:32px;height:32px;display:grid;place-items:center;cursor:pointer;color:var(--ink-2);flex:0 0 auto}
.file-row .up:hover,.file-row .rm:hover{border-color:var(--brand);color:var(--brand-600)}
.file-row .up svg,.file-row .rm svg{width:16px;height:16px}

.opts{display:flex;flex-direction:column;gap:16px;margin-top:18px}
.opt{display:flex;flex-direction:column;gap:7px}
.opt.row{flex-direction:row;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.opt label,.opt .lb{font-weight:700;font-size:13.5px;color:var(--ink-2)}
.opt .hint{font-size:12.5px;color:var(--muted);font-weight:400}
input[type=text],input[type=number],select,textarea{font:inherit;color:var(--ink);background:var(--field);border:1px solid var(--line-2);border-radius:10px;padding:10px 12px;width:100%;transition:border-color .15s ease,box-shadow .15s ease,background .15s ease}
input[type=text]:hover,input[type=number]:hover,select:hover,textarea:hover{border-color:var(--brand-100)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-100)}
input[type=range]{width:100%;accent-color:var(--brand)}
input[type=checkbox],input[type=radio]{accent-color:var(--brand);width:18px;height:18px;min-width:18px;vertical-align:middle;cursor:pointer}
select{appearance:none;-webkit-appearance:none;-moz-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:34px;cursor:pointer}
/* Dark theme: the chevron's stroke is baked into the data-URI, so swap in a theme-appropriate light grey instead of the fixed slate-400 (token hygiene, R69). */
:root[data-theme="dark"] select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%239fb1c4' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
/* Number stepper (R54, style unification): Chromium paints native up/down spin buttons inside
   <input type=number>. They are UA chrome that ignores our theme — in dark mode they render a
   light-grey pill inside the navy field (visually broken), and in every theme they clash with the
   site's refined SVG iconography. Hide the native stepper so numeric fields match text/select.
   Keyboard Up/Down still steps the value; range sliders remain for coarse input. */
input[type=number]{-moz-appearance:textfield;appearance:textfield}
input[type=number]::-webkit-outer-spin-button,input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;appearance:none;margin:0}
/* Color fields (R53, style unification): a raw <input type=color> renders with square corners and a
   native border/background, clashing with the rounded, theme-aware text/select/textarea fields. Unify
   its chrome here; per-call-site sizing (optColor: full-width 44px; toolbars: compact swatch) stays inline. */
input[type=color]{height:38px;padding:3px;border:1px solid var(--line-2);border-radius:10px;background:var(--field);cursor:pointer;transition:border-color .15s ease,box-shadow .15s ease}
input[type=color]:hover{border-color:var(--brand-100)}
input[type=color]::-webkit-color-swatch-wrapper{padding:0}
input[type=color]::-webkit-color-swatch{border:0;border-radius:7px}
input[type=color]::-moz-color-swatch{border:0;border-radius:7px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{border:1px solid var(--line-2);background:var(--field);border-radius:9px;padding:8px 13px;font-size:13px;font-weight:700;cursor:pointer;color:var(--ink-2);transition:border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease}
.chip:hover{border-color:var(--brand-100);background:var(--brand-050);color:var(--brand-700)}
.chip.active{background:var(--grad-brand);border-color:transparent;color:#fff;box-shadow:0 4px 12px rgba(37,99,235,.28)}
.chip .sw{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px;border:1px solid var(--line-2)}

.row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.check{display:flex;align-items:center;gap:9px;font-weight:600;font-size:14px;color:var(--ink-2);cursor:pointer}
.check input{width:18px;height:18px;accent-color:var(--brand)}

.progress{height:10px;background:var(--surface-2);border-radius:999px;overflow:hidden;margin-top:8px}
.progress>span{display:block;height:100%;background:var(--grad-brand);width:0;transition:width .2s}
.status{font-size:13.5px;color:var(--muted);margin-top:10px;min-height:18px}
.status.err{color:var(--err);font-weight:600}
.actions{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}

.results{margin-top:22px;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.res-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--surface);box-shadow:var(--shadow-sm)}
.res-card canvas,.res-card img{width:100%;display:block;background:var(--surface);max-height:300px;object-fit:contain}
.res-card .rb{padding:10px 12px;display:flex;align-items:center;justify-content:space-between;gap:8px}
.res-card .rb .t{font-size:12.5px;font-weight:700;color:var(--ink-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
/* form-merge result table */
.fm-tbl{width:100%;border-collapse:collapse;margin:8px 0 0;background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:13px}
.fm-tbl th,.fm-tbl td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:260px}
.fm-tbl th{background:var(--brand-050);color:var(--ink);font-weight:700;position:sticky;top:0}
.fm-tbl tr:last-child td{border-bottom:none}
.fm-tbl tbody tr:nth-child(even){background:var(--surface-2)}

/* preview grid of page thumbnails (reorder/extract/remove/rotate) */
.page-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:14px;margin-top:18px}
.pg-thumb{position:relative;border:2px solid var(--line);border-radius:12px;background:var(--surface);padding:8px;text-align:center;cursor:pointer;transition:.12s;user-select:none;min-height:76px}
.pg-thumb canvas{width:100%;height:auto;border-radius:5px;box-shadow:var(--shadow-sm)}
.pg-thumb .pn{position:absolute;top:-9px;left:-9px;min-width:22px;height:22px;padding:0 5px;border-radius:11px;background:var(--ink);color:#fff;font-size:12px;font-weight:800;display:grid;place-items:center}
.pg-thumb.sel{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-100)}
.pg-thumb.sel .pn{background:var(--brand)}
.pg-thumb .tools{position:absolute;bottom:6px;right:6px;display:flex;gap:4px}
.pg-thumb .tools button{width:26px;height:26px;border-radius:7px;border:1px solid var(--line-2);background:var(--field);display:grid;place-items:center;cursor:pointer;color:var(--ink-2)}
.pg-thumb .tools button svg{width:14px;height:14px}
.pg-thumb .tools button:hover{border-color:var(--brand);color:var(--brand-600)}

/* seo copy */
.prose{max-width:860px;margin:0 auto}
.prose h2{font-size:clamp(19px,2.4vw,21px);margin:26px 0 12px;font-weight:800;scroll-margin-top:84px;position:relative;padding-left:14px}
.prose h2::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:5px;border-radius:5px;background:var(--grad-brand)}
.prose h3{font-size:17px;margin:18px 0 6px}
.prose p,.prose li{color:var(--ink-2);font-size:15px}
.prose ul{padding-left:22px}
.prose ul li::marker{color:var(--brand)}
.prose a{color:var(--brand-700);text-decoration:underline;text-decoration-color:var(--brand-100);text-underline-offset:2px;font-weight:600}
.prose a:hover{color:var(--brand-600);text-decoration-color:var(--brand-600)}
.prose strong{color:var(--ink);font-weight:800}
.prose blockquote{margin:16px 0;padding:12px 16px;border-left:4px solid var(--brand);background:var(--brand-050);border-radius:0 10px 10px 0;color:var(--ink-2)}
.prose blockquote p{margin:0;color:var(--ink-2)}
.prose table{border-collapse:collapse;width:100%;margin:16px 0;font-size:14px}
.prose th,.prose td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.prose th{background:var(--surface-2);font-weight:700}
.prose .cols{display:grid;grid-template-columns:1fr 1fr;gap:10px 26px}
/* --- about / legal / guide content (R71) --- */
.legal-meta{font-size:13.5px;color:var(--muted);margin:-6px 0 18px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.about-list{list-style:none;margin:10px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}
.about-list li{background:var(--surface-2);border:1px solid var(--line);border-left:3px solid var(--brand);border-radius:var(--radius-sm);padding:12px 14px;font-size:14px;line-height:1.7;color:var(--ink-2)}
.about-list li::marker{content:none}
.about-list li strong{color:var(--ink)}
.about-cta{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:20px 0 10px;padding:18px 20px;background:var(--brand-050);border:1px solid var(--brand-100);border-radius:var(--radius)}
.about-cta-txt{display:flex;flex-direction:column;gap:3px;min-width:0}
.about-cta-txt strong{font-size:16px;color:var(--ink)}
.about-cta-txt span{font-size:13.5px;color:var(--muted)}
.about-meta{font-size:13.5px;color:var(--muted);margin-top:10px}
.prose a.btn{text-decoration:none;font-weight:700}
.prose a.btn-primary{color:#fff}
.prose a.btn-ghost{color:var(--ink-2)}
.toc{border:1px solid var(--line);background:var(--surface-2);border-radius:12px;padding:14px 16px;margin:0 0 26px}
.toc-h{font-size:13px;font-weight:800;color:var(--ink-2);margin-bottom:10px}
.toc a{display:inline-block;margin:4px 10px 4px 0;padding:5px 11px;background:var(--surface);border:1px solid var(--line-2);border-radius:999px;color:var(--brand);font-size:13px;font-weight:600;text-decoration:none;line-height:1.3}
.toc a:hover{border-color:var(--brand);background:var(--brand-050);text-decoration:none}
.rel{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.rel .tool-card{padding:16px;gap:8px}
.rel .tool-card .ic{width:38px;height:38px;border-radius:10px}
.rel .tool-card .ic svg{width:20px;height:20px}
.rel .tool-card h3{font-size:14.5px}
.rel .tool-card p{font-size:12.5px;line-height:1.5}

.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 20px;border-radius:12px;box-shadow:var(--shadow-lg);font-size:14px;font-weight:600;opacity:0;pointer-events:none;transition:.25s;z-index:2000;max-width:90vw}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.err{background:var(--err)}
.notice{display:flex;gap:10px;align-items:flex-start;background:var(--brand-050);border:1px solid var(--brand-100);border-left:4px solid var(--brand-600);color:var(--brand-700);border-radius:12px;padding:12px 14px;font-size:13.5px;margin-bottom:18px;transition:border-color .15s ease,box-shadow .15s ease}
.notice svg{width:18px;height:18px;flex:0 0 auto;margin-top:1px;color:var(--brand-600)}
.notice.warn{background:#fff7ed;border-color:#fed7aa;border-left-color:#f59e0b;color:#9a3412}
.notice.warn svg{color:#f59e0b}

/* ---------- Redact editor (redact / add-links / qr-code / remove-watermark) ---------- */
.redact-wrap{position:relative;display:flex;flex-direction:column;gap:14px;margin-top:18px}
.redact-ed{display:flex;flex-direction:column;gap:10px}
.redact-tools{display:flex;gap:8px;flex-wrap:wrap;align-items:center;padding:12px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.redact-tools textarea{min-width:220px;flex:1 1 260px;width:auto}
.redact-tools .btn{display:inline-flex;align-items:center;gap:6px}
.redact-tools .btn svg{width:15px;height:15px}
.redact-stage{position:relative;margin:2px 0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2);padding:14px;overflow:auto;max-height:76vh;overscroll-behavior:contain}
.redact-stage canvas{display:block;margin:0 auto;max-width:100%;height:auto;border-radius:6px;box-shadow:var(--shadow);touch-action:none;cursor:crosshair}
.redact-num{position:sticky;bottom:0;margin:12px auto -4px;width:max-content;max-width:calc(100% - 24px);background:var(--ink);color:#fff;font-size:12.5px;font-weight:600;padding:6px 14px;border-radius:999px;opacity:.92}
@media (max-width:600px){.redact-tools .btn span{display:none}.redact-tools textarea{min-width:100%}}

/* ---------- Annotate ---------- */
.ann-wrap{position:relative;display:flex;flex-direction:column;gap:12px;margin-top:18px}
.ann-toolbar{display:flex;gap:8px;flex-wrap:wrap;padding:12px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.ann-tb{display:grid;place-items:center;width:42px;height:42px;padding:8px;border-radius:10px;border:1px solid var(--line-2);background:var(--field);color:var(--ink-2);cursor:pointer;transition:.15s}
.ann-tb:hover{border-color:var(--brand);color:var(--brand-700)}
.ann-tb[aria-pressed="true"]{background:var(--brand-050);border-color:var(--brand);color:var(--brand)}
.ann-tb svg{width:19px;height:19px}
.ann-optrow,.ann-optrow2{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.ann-optrow2{margin-top:-6px}
.ann-hrow{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.ann-hrow .btn{display:inline-flex;align-items:center;gap:6px}
.ann-hrow .btn svg{width:15px;height:15px}
.ann-nav{display:flex;align-items:center;gap:8px;margin-left:auto}
.ann-page{font-size:13px;font-weight:700;color:var(--ink-2);min-width:96px;text-align:center}
.ann-stage{position:relative;margin:4px 0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2);padding:14px;overflow:auto;max-height:76vh;overscroll-behavior:contain}
.ann-stage canvas{display:block;margin:0 auto;max-width:100%;height:auto;border-radius:6px;box-shadow:var(--shadow);touch-action:none;cursor:crosshair}
.ann-stage canvas:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.ann-tip{position:sticky;bottom:0;margin:12px auto -4px;width:max-content;max-width:calc(100% - 24px);background:var(--ink);color:#fff;font-size:12.5px;font-weight:600;padding:6px 14px;border-radius:999px;opacity:.92}
.ann-pal{position:absolute;z-index:10;top:calc(100% - 6px);right:14px;display:grid;grid-template-columns:repeat(6,40px);gap:8px;padding:12px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);max-height:260px;overflow-y:auto;overscroll-behavior:contain}
.ann-sym,.ann-emo{width:40px;height:40px;display:grid;place-items:center;border-radius:8px;border:1px solid var(--line-2);background:var(--field);cursor:pointer;transition:.15s;font-size:22px;line-height:1}
.ann-sym svg{width:20px;height:20px;color:var(--ink-2)}
.ann-sym:hover,.ann-emo:hover{border-color:var(--brand);background:var(--brand-050)}
@media (max-width:600px){.ann-pal{grid-template-columns:repeat(4,40px);right:8px;left:8px;width:auto;justify-content:center}.ann-tb{width:38px;height:38px}.ann-hrow .btn span{display:none}.ann-nav{margin-left:0}}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .grid{grid-template-columns:repeat(3,1fr)}
  .features,.rel{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr;gap:24px}
  .recent{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:900px){
  .steps{grid-template-columns:1fr}
  .step::after{display:none}
}
@media (max-width:880px){
  .nav-links{display:none}
  .menu-toggle{display:grid}
  .nav-mobile{display:none;flex-direction:column;gap:2px;padding:10px 20px 16px;border-top:1px solid var(--line);background:var(--surface)}
  .nav-mobile.open{display:flex}
  .nav-mobile a{padding:11px 8px;border-bottom:1px solid var(--surface-2);font-weight:700;color:var(--ink-2)}
  .nav-mobile .m-tools{display:grid;grid-template-columns:1fr 1fr;gap:6px;padding-top:8px}
  .nav-mobile .m-tools{max-height:60vh;overflow-y:auto;overscroll-behavior:contain}
  .nav-mobile .m-tools a{display:flex;align-items:center;gap:8px;font-size:13px;border-bottom:none;padding:8px}
  .nav-mobile .m-tools .ic{width:26px;height:26px;border-radius:7px;display:grid;place-items:center;color:#fff;flex:0 0 auto}
  .nav-mobile .m-tools .ic svg{width:15px;height:15px}
  .steps{grid-template-columns:1fr}
  .row2,.row3,.prose .cols{grid-template-columns:1fr}
  .tool-hero-in{align-items:flex-start}
}
@media (max-width:600px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .features,.rel{grid-template-columns:1fr}
  .recent{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .hero{padding:40px 0 30px}
  .container{padding:0 16px}
  .panel{padding:18px}
  .drop{padding:30px 16px}
}
@media (max-width:600px){
  .btn,.nav-actions .lang-btn,.nav-actions .theme-btn{min-height:44px}
  .cat-chip,.chip{padding:10px 15px}
}
@media (max-width:400px){
  .foot-grid{grid-template-columns:1fr}
  .btn,.nav-actions .lang-btn,.nav-actions .theme-btn{min-height:44px}
  .cat-chip,.chip{padding:10px 15px}
}
@media (max-width:380px){
  .nav{gap:10px}
  .nav-actions{gap:6px}
  .brand{font-size:16px;gap:8px}
  .brand .logo{width:30px;height:30px}
  .nav-actions .icon-btn,.nav-actions .theme-btn,.nav-actions .lang-btn{padding:0 7px;min-width:34px;height:34px}
  .menu-toggle{width:36px;height:36px}
}
/* compare: side-by-side + A/B slider + diff overview */
.cmp{display:flex;gap:14px;flex-wrap:wrap;align-items:flex-start}
.cmp-c{flex:1 1 320px;min-width:260px}
.cmp-c h4{margin:0 0 6px;font-size:13px;color:var(--ink-2);font-weight:700}
.cmp-box{border:1px solid var(--line);border-radius:10px;padding:6px;background:var(--surface);text-align:center;overflow:auto;max-height:72vh}
.cmp-box canvas{max-width:100%;height:auto}
.cmp-slider{position:relative;margin-top:14px;flex:1 1 100%;border:1px solid var(--line);border-radius:10px;background:var(--surface);overflow:hidden;touch-action:none;user-select:none}
.cmp-slider canvas{display:block;width:100%;height:auto}
.cmp-slider-handle{position:absolute;top:0;bottom:0;width:2px;background:var(--brand);cursor:ew-resize;z-index:2}
.cmp-slider-handle::after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:22px;height:22px;border-radius:50%;background:var(--brand);border:3px solid #fff;box-shadow:0 1px 6px rgba(0,0,0,.35)}
.diff-ov{margin-top:14px;border:1px solid var(--line);border-radius:10px;padding:12px;background:var(--surface)}
.diff-ov-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.diff-ov-head h4{margin:0;font-size:14px}
.diff-ov-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px;max-height:52vh;overflow:auto}
.diff-ov-cell{position:relative;border:2px solid var(--line);border-radius:8px;padding:6px;background:var(--surface);cursor:pointer;text-align:center;min-height:60px}
.diff-ov-cell:hover{border-color:var(--brand)}
.diff-ov-cell canvas{width:100%;height:auto;border-radius:4px}
.diff-ov-cell .pn{position:absolute;top:4px;left:4px;min-width:20px;height:20px;padding:0 5px;border-radius:10px;background:var(--ink);color:#fff;font-size:11px;font-weight:800;display:grid;place-items:center}
.diff-ov-cell.diff{border-color:var(--err)}
.diff-ov-cell.diff .pn{background:var(--err)}
.diff-ov-cell .badge{position:absolute;top:4px;right:4px;background:var(--err);color:#fff;font-size:11px;font-weight:800;border-radius:9px;padding:1px 6px}
.diff-ov-cell .ok{position:absolute;top:4px;right:4px;background:var(--ok);color:#fff;font-size:11px;font-weight:800;border-radius:9px;padding:1px 6px}
.btn.active{box-shadow:inset 0 0 0 2px var(--brand);color:var(--brand-600)}
@media print{
  .site-header,.site-footer,.tool-hero .crumbs,.nav,.no-print,.nav-mobile,.actions,.drop,.icon-btn,.theme-btn,.lang-btn{display:none!important}
  body::before{display:none}
  body{background:#fff!important;color:#111!important}
  .panel{box-shadow:none;border:1px solid #ccc;break-inside:avoid}
  .tip-item,.faq details{break-inside:avoid}
  .tool-hero{background:transparent!important;padding:0 0 12px}
  .tool-hero *{color:#111!important}
  .crumbs{display:none!important}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  @page{margin:16mm}
}

/* ===== Home page restyle (scoped to .home so tool pages are untouched) ===== */
.home .hero{
  text-align:center;
  padding:70px 0 56px;
  background:
    radial-gradient(1100px 480px at 50% -30%,rgba(37,99,235,.14),transparent 62%),
    radial-gradient(900px 400px at 50% 130%,rgba(14,165,233,.12),transparent 60%);
}
.home .hero-inner{align-items:center;text-align:center}
.home .hero .badges{justify-content:center}
.home .hero .search-wrap{margin:24px auto 0;width:min(620px,100%)}
.home .hero .search-wrap svg.s-ic{width:22px;height:22px;left:18px}

/* left-aligned section heads with colored accent bar + icon (home only) */
.home .section-head{text-align:left;margin-bottom:28px}
.home .section-head h2{position:relative;padding-left:15px}
.home .section-head h2::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:5px;border-radius:5px;background:var(--grad-brand)}
.home .sh-emoji{font-size:.92em;line-height:1;filter:drop-shadow(0 1px 1px rgba(15,23,42,.08))}
.home .section-head p{margin:10px 0 0;max-width:680px}

/* denser / more compact tool grid on home — 固定一行 5 个（桌面）；窄屏按断点降列 */
.home .grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}
@media (max-width:1024px){.home .grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media (max-width:880px){.home .grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:600px){.home .grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:400px){.home .grid{grid-template-columns:1fr}}
.home .tool-card{padding:16px 15px 15px;gap:9px}
.home .tool-card .ic{width:40px;height:40px;border-radius:11px}
.home .tool-card .ic svg{width:21px;height:21px}
.home .tool-card h3{font-size:15.5px}

/* recent row + clear button */
.home .recent-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:16px}
.home .recent-head .section-head{text-align:left;margin:0}
.home .recent-head h2{font-size:clamp(18px,2.2vw,20px);position:relative;padding-left:15px}
.home .recent-head h2::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:5px;border-radius:5px;background:var(--grad-brand)}
.home .recent-head .sh-emoji{font-size:.9em}
.home #recentClear{flex:0 0 auto}

@media (max-width:600px){
  .home .hero{padding:48px 0 36px}
  .home .hero .search-wrap{margin-top:18px}
  .home .recent-head{flex-wrap:wrap;gap:8px}
}

/* ===== Back to top (injected by ui.js; hidden in print via .no-print) ===== */
.back-top{position:fixed;right:22px;bottom:22px;z-index:60;width:46px;height:46px;display:grid;place-items:center;border:0;border-radius:14px;background:var(--grad-brand);color:#fff;cursor:pointer;box-shadow:0 10px 24px rgba(37,99,235,.34);opacity:0;visibility:hidden;pointer-events:none;transform:translateY(14px) scale(.94);transition:opacity .22s ease,transform .22s ease,visibility .22s,box-shadow .18s ease}
.back-top.show{opacity:1;visibility:visible;pointer-events:auto;transform:none}
.back-top:hover{box-shadow:0 14px 32px rgba(37,99,235,.44);transform:translateY(-2px)}
.back-top:focus-visible{outline:2px solid var(--brand-700);outline-offset:2px}
.back-top:active{transform:scale(.95)}
.back-top svg{width:20px;height:20px}

/* ===== 404 page (hero-404 hook added in gen.js) ===== */
.hero-404{text-align:center;padding:70px 0 58px}
.hero-404 .hero-inner{align-items:center;text-align:center;gap:15px}
.hero-404 .e404-ico{width:66px;height:66px;border-radius:19px;display:grid;place-items:center;background:var(--brand-050);color:var(--brand-600);border:1px solid var(--brand-100);box-shadow:var(--shadow-sm)}
.hero-404 .e404-ico svg{width:30px;height:30px}
.hero-404 h1.e404-code{font-size:clamp(58px,13vw,106px);line-height:1;font-weight:900;letter-spacing:-3px;margin:0;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-404 p.sub{max-width:520px}
.hero-404 .cta{justify-content:center;margin-top:6px}

@media (max-width:640px){
  .back-top{right:16px;bottom:16px;width:42px;height:42px;border-radius:12px}
  .hero-404{padding:52px 0 44px}
}

/* ===== dark mode: back to top + 404 ===== */
:root[data-theme="dark"] .back-top{box-shadow:0 10px 24px rgba(0,0,0,.5)}
:root[data-theme="dark"] .back-top:hover{box-shadow:0 14px 32px rgba(37,99,235,.5)}
:root[data-theme="dark"] .hero-404 .e404-ico{background:rgba(37,99,235,.16);border-color:rgba(125,179,255,.32);color:#7db3ff}
/* ===== offline fallback page (hero-offline hook added in gen.js) ===== */
.hero-offline{text-align:center;padding:70px 0 58px}
.hero-offline .hero-inner{align-items:center;text-align:center;gap:15px}
.hero-offline .offline-ico{width:66px;height:66px;border-radius:19px;display:grid;place-items:center;background:#fff7ed;color:#ea580c;border:1px solid #fed7aa;box-shadow:var(--shadow-sm)}
.hero-offline .offline-ico svg{width:30px;height:30px}
.hero-offline h1{font-size:clamp(30px,7vw,52px);line-height:1.1;font-weight:900;letter-spacing:-1px;margin:0}
.hero-offline p.sub{max-width:540px}
.hero-offline .about-p{max-width:540px;color:var(--muted)}
.hero-offline .cta{justify-content:center;margin-top:6px}
.hero-offline .offline-hint{margin:14px 0 0;font-size:13.5px;color:var(--muted);max-width:540px}
@media (max-width:640px){.hero-offline{padding:52px 0 44px}}
:root[data-theme="dark"] .hero-offline .offline-ico{background:rgba(234,88,12,.16);border-color:rgba(251,146,60,.34);color:#fb923c}
@media (prefers-reduced-motion: reduce){.back-top{transition:opacity .01s,visibility .01s}}

/* ===== R15: header scroll shadow + refined focus + selection + section rhythm + dropzone ===== */
.site-header.scrolled{box-shadow:0 6px 24px rgba(30,41,90,.08);border-bottom-color:var(--line)}
:root[data-theme="dark"] .site-header.scrolled{box-shadow:0 8px 28px rgba(0,0,0,.45);border-bottom-color:#1c2a44}

/* refined focus ring for key interactive components (a11y-friendly, softer than hard outline) */
.btn:focus-visible,.chip:focus-visible,.cat-chip:focus-visible,.tool-card:focus-visible,.drop:focus-visible,.lang-btn:focus-visible,.theme-btn:focus-visible{outline:none;box-shadow:0 0 0 3px var(--brand-100),0 0 0 1.5px var(--brand)}
/* brand-tinted text selection */
::selection{background:var(--brand-100);color:var(--brand-700)}
:root[data-theme="dark"] ::selection{background:rgba(37,99,235,.45);color:#eaf1ff}

/* home section rhythm: elegant hairline dividers between content sections */
.home .section + .section{position:relative}
.home .section + .section::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--line) 16%,var(--line) 84%,transparent)}

/* upload dropzone polish */
.drop .dic{transition:transform .2s ease}
.drop:hover,.drop.over{border-color:var(--brand);background:linear-gradient(180deg,var(--brand-050),var(--surface-2))}
.drop:hover .dic,.drop.over .dic{transform:scale(1.06)}

/* ===== R16: brand depth & signature — cat-bar elevation + hero dot-mesh ===== */
/* tools-page sticky category bar gains a soft elevation shadow so it reads as floating */
.tools-page .cat-bar{box-shadow:0 12px 30px rgba(30,41,90,.09)}
.cat-bar{box-shadow:0 10px 26px rgba(30,41,90,.07)}
/* home hero subtle brand dot-mesh for depth (masked to fade, sits behind content) */
.home .hero{position:relative}
.home .hero::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;opacity:.85;background-image:radial-gradient(rgba(37,99,235,.12) 1px,transparent 1.6px);background-size:22px 22px;mask-image:radial-gradient(680px 340px at 50% 24%,#000,transparent 72%);-webkit-mask-image:radial-gradient(680px 340px at 50% 24%,#000,transparent 72%)}
:root[data-theme="dark"] .home .hero::before{background-image:radial-gradient(rgba(120,170,255,.20) 1px,transparent 1.6px)}

/* ===== R17: scroll-reveal motion polish (progressive enhancement) ===== */
/* Use the independent `translate` property so it never fights :hover transforms */
.reveal{opacity:0;translate:0 18px;transition:opacity .55s cubic-bezier(.22,.61,.36,1),translate .55s cubic-bezier(.22,.61,.36,1);transition-delay:calc(var(--i,0) * 55ms);will-change:opacity,translate}
.reveal.is-visible{opacity:1;translate:0 0}
/* Reduced-motion users: show everything instantly, no entrance */
@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1!important;translate:none!important;transition:none!important}
}
/* No-JS safety: the .reveal class is only ever added by JS, but guard anyway */
html:not(.js) .reveal{opacity:1!important;translate:none!important}

/* ===== R18: dark-mode aesthetic & correctness pass ===== */
/* 1) Elements that used light `var(--ink)` as a white-text background became
      near-white-on-white in dark mode → invisible. Give them a dark pill + light text. */
:root[data-theme="dark"] .toast,
:root[data-theme="dark"] .pg-thumb .pn,
:root[data-theme="dark"] .redact-num,
:root[data-theme="dark"] .ann-tip{
  background:#0e1726;color:var(--ink);border:1px solid var(--line-2);
  box-shadow:0 6px 18px rgba(0,0,0,.55);
}
/* 2) Brand-tinted surfaces: light mode pairs dark brand text on light brand bg.
      In dark mode --brand-050 is dark navy, so switch text to a light brand tint. */
:root[data-theme="dark"] .notice:not(.warn){background:rgba(37,99,235,.14);border-color:rgba(37,99,235,.34);border-left-color:#3b82f6;color:#bcd4ff}
:root[data-theme="dark"] .notice:not(.warn) svg{color:#7db3ff}
:root[data-theme="dark"] .eyebrow{background:rgba(37,99,235,.16);color:#9cc4ff}
:root[data-theme="dark"] .feature .ic{background:rgba(37,99,235,.16);color:#8fb6ff}
:root[data-theme="dark"] .feat-item .fi-ic{background:rgba(37,99,235,.16);color:#8fb6ff}
:root[data-theme="dark"] .file-row .fi{background:rgba(37,99,235,.16);color:#8fb6ff}
:root[data-theme="dark"] .sec-h-ic{background:rgba(37,99,235,.16);color:#8fb6ff}
:root[data-theme="dark"] .fm-tbl th{background:rgba(37,99,235,.14);color:#dbe6ff}
:root[data-theme="dark"] .toc a{color:#9cc4ff}
:root[data-theme="dark"] .toc a:hover{background:rgba(37,99,235,.16);color:#cfe2ff}
:root[data-theme="dark"] .fm-tbl tbody tr:nth-child(even){background:#13203a}
/* 3) Dark card depth: subtle lighter border + inset top highlight (signature dark "raised" look;
      box-shadow alone barely reads on dark, so add a 1px top inner highlight + refined border). */
:root[data-theme="dark"] .tool-card,
:root[data-theme="dark"] .feature,
:root[data-theme="dark"] .step,
:root[data-theme="dark"] .panel,
:root[data-theme="dark"] .res-card,
:root[data-theme="dark"] .dropdown{
  box-shadow:inset 0 1px 0 rgba(255,255,255,.05),0 10px 30px rgba(0,0,0,.45);
  border-color:#243a5e;
}
:root[data-theme="dark"] .tool-card:hover{
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06),0 16px 40px rgba(0,0,0,.55),0 10px 30px rgba(37,99,235,.22);
  border-color:#2f4d7d;
}
:root[data-theme="dark"] .feature:hover,
:root[data-theme="dark"] .step:hover{
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06),0 16px 40px rgba(0,0,0,.55),0 10px 30px rgba(37,99,235,.20);
  border-color:#2f4d7d;
}
:root[data-theme="dark"] .cat-bar,
:root[data-theme="dark"] .tools-page .cat-bar{box-shadow:0 12px 30px rgba(0,0,0,.5);border-color:#243a5e}
:root[data-theme="dark"] .fm-tbl{box-shadow:0 8px 24px rgba(0,0,0,.4)}
:root[data-theme="dark"] .pg-thumb{border-color:#243a5e}
:root[data-theme="dark"] .pg-thumb.sel{border-color:#3b82f6;box-shadow:0 0 0 3px rgba(59,130,246,.35)}
/* 4) Primary button gets a soft brand glow in dark */
:root[data-theme="dark"] .btn-primary{box-shadow:0 8px 22px rgba(37,99,235,.5)}
:root[data-theme="dark"] .btn-primary:hover{box-shadow:0 12px 30px rgba(37,99,235,.6)}
/* 5) Smooth theme switch (class toggled by ui.js only on user toggle, never on load,
      and never under reduced-motion) */
html.theme-anim,html.theme-anim *{transition:background-color .25s ease,color .25s ease,border-color .25s ease,box-shadow .25s ease!important}
@media (prefers-reduced-motion: reduce){html.theme-anim,html.theme-anim *{transition:none!important}}

/* ===== R19: reading-comfort typography + interaction feedback states ===== */

/* --- Reading comfort: balanced headings & comfortable prose --- */
/* `text-wrap:balance` gives headings a tidy, book-like ragged edge;
   `text-wrap:pretty` avoids orphan words at the end of paragraphs. */
.hero h1,.tool-hero h1,.section-head h2,.group-head h2,.prose h2,.prose h3,
.tool-card h3,.feature h3,.step h3,.recent-head h2{text-wrap:balance}
.prose p,.tool-hero .lead,.hero p.sub,.about-p,.feat-item p,.tip-item span{text-wrap:pretty}

/* Comfortable reading rhythm inside long-form SEO copy */
.prose p{line-height:1.85;margin:0 0 15px}
.prose p:last-child{margin-bottom:0}
.prose h2 + p,.prose h3 + p{margin-top:10px}

/* inline code in prose (correct treatment if present) */
.prose code{background:var(--brand-050);color:var(--brand-700);padding:1px 6px;border-radius:6px;font-size:.9em;border:1px solid var(--brand-100);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
:root[data-theme="dark"] .prose code{background:rgba(37,99,235,.18);color:#bcd4ff;border-color:rgba(59,130,246,.4)}

/* ordered-list markers match the brand treatment of bullets */
.prose ol{padding-left:24px}
.prose ol li::marker{color:var(--brand);font-weight:700}

/* keep long unbroken strings (URLs, hashes) from blowing out the layout */
.prose,.about-p,.tool-hero .lead{overflow-wrap:break-word}

/* --- Interaction feedback: tactile press + safe disabled --- */
/* smooth, subtle press on chips/cards/nav so clicks feel responsive */
.cat-chip,.chip{transition:transform .08s ease,border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease}
.cat-chip:active,.chip:active{transform:translateY(1px)}
.btn-ghost:active{transform:translateY(1px)}
.tool-card:active{transform:translateY(-1px)}
.nav-links a{transition:transform .08s ease}
.nav-links a:active{transform:translateY(1px)}

/* Disabled buttons must NOT show hover lift/brighten.
   Previously :hover on .btn-primary still applied a brighter box-shadow to disabled. */
.btn:disabled,.btn:disabled:hover{transform:none!important;cursor:not-allowed}
.btn-primary:disabled,.btn-primary:disabled:hover{filter:none;box-shadow:0 6px 18px rgba(37,99,235,.18)}
.btn-ghost:disabled,.btn-ghost:disabled:hover{background:var(--field);border-color:var(--line-2);color:var(--muted)}

/* busy/loading affordance (progressive; tools toggle aria-busy during processing).
   Show a unified spinner so the "working" state is obvious even where no progress bar exists. */
.btn[aria-busy="true"]{position:relative;color:transparent!important;cursor:progress;opacity:1;pointer-events:none}
.btn[aria-busy="true"]::after{content:"";position:absolute;left:50%;top:50%;width:16px;height:16px;margin:-8px 0 0 -8px;border:2px solid rgba(255,255,255,.45);border-top-color:#fff;border-radius:50%;animation:btnSpin .6s linear infinite}
.btn-ghost[aria-busy="true"]::after{border-color:rgba(37,99,235,.32);border-top-color:var(--brand)}
.btn[aria-busy="true"] svg{visibility:hidden}
@keyframes btnSpin{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){.btn[aria-busy="true"]::after{animation:none}}

/* ===== R20: tool workspace polish (upload → processing → result) ===== */

/* 1) Progress bar: shimmer sweep on the fill (live processing feedback) */
.progress{height:10px;background:var(--surface-2);border-radius:999px;overflow:hidden;margin-top:8px}
.progress>span{position:relative;overflow:hidden;display:block;height:100%;background:var(--grad-brand);width:0;transition:width .2s}
.progress>span::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.45),transparent);transform:translateX(-100%);animation:progShimmer 1.1s ease-in-out infinite}
@keyframes progShimmer{100%{transform:translateX(100%)}}
@media (prefers-reduced-motion: reduce){.progress>span::after{animation:none}}

/* 2) File rows: tactile elevation + button emphasis on hover */
.file-row{transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}
.file-row:hover{transform:translateY(-1px);box-shadow:var(--shadow-sm);border-color:var(--brand-100)}
.file-row .up,.file-row .rm{transition:border-color .15s ease,color .15s ease,transform .15s ease}
.file-row .up:hover,.file-row .rm:hover{transform:translateY(-1px)}

/* 3) Result cards: hover lift + thumbnail zoom (clipped by overflow:hidden) */
.res-card{transition:transform .2s ease,box-shadow .2s ease}
.res-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.res-card img,.res-card canvas{transition:transform .25s ease}
.res-card:hover img,.res-card:hover canvas{transform:scale(1.04)}

/* 4) Toasts: success/warning variants + refined base shadow */
.toast{box-shadow:0 12px 34px rgba(0,0,0,.28)}
.toast.ok{background:var(--ok)}
.toast.warn{background:var(--warn)}

/* 5) Status: from plain text to a tidy inline status pill */
.status{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;background:var(--surface-2);border:1px solid var(--line);color:var(--ink-2);font-weight:600;margin-top:10px;min-height:18px}
.status:empty{display:none}
.status.err{background:#fef2f2;border-color:#fecaca;color:var(--err)}
:root[data-theme="dark"] .status.err{background:rgba(220,38,38,.16);border-color:rgba(248,113,113,.4);color:#fca5a5}

/* 6) Page thumbnails: lift on hover (page-selection grid) */
.pg-thumb{transition:transform .14s ease,box-shadow .14s ease,border-color .14s ease}
.pg-thumb:hover{transform:translateY(-2px);box-shadow:var(--shadow)}

/* ===== R21: mobile touch comfort & responsive refinement ===== */

/* 1) Global touch comfort (kill tap-flash, stop auto font scaling,
      contain overscroll bounce, smooth anchor scrolling) */
html{-webkit-tap-highlight-color:transparent;-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
html,body{overscroll-behavior-y:contain}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}

/* 2) Dynamic viewport for the mobile nav drawer (no URL-bar jump) */
@media (max-width:880px){
  .nav-mobile.open{min-height:100dvh}
}

/* 3) Touch targets reach ~44px on mobile (WCAG 2.5.5) */
@media (max-width:600px){
  .file-row .up,.file-row .rm{min-width:40px;min-height:40px}
  .pg-thumb .tools button{min-width:30px;min-height:30px}
  .btn-sm{min-height:38px}
  .cat-chip,.chip{min-height:40px;display:inline-flex;align-items:center}
  .nav-mobile a,.nav-mobile .m-tools a{min-height:44px;display:flex;align-items:center}
  .ann-tb{min-width:42px;min-height:42px}
  .back-top{bottom:calc(16px + env(safe-area-inset-bottom))}
  .home .hero .search-wrap{width:100%}
}

/* ===== 卡片标题移到图标右侧（图标 + 标题同行，描述整行） ===== */
.tool-card{display:grid;grid-template-columns:auto minmax(0,1fr);align-content:start;column-gap:11px;row-gap:10px}
.tool-card .ic{grid-column:1;grid-row:1;align-self:center}
.tool-card h3{grid-column:2;grid-row:1;align-self:center;min-width:0}
.tool-card p{grid-column:1 / -1;grid-row:2}

/* ===== R25 工具工作台「控制条 / 选项组」排版布局美化（2026-09-16）===== */
/* ① 控制条内的「页面范围」输入不再被拉伸：
   原先 .opt 带内联 flex:1 + 全局 input{width:100%} → 输入框会撑满整行（约 740px），
   左右失衡。改为定宽弹性（200–400px），由 tools.js 的 .opt-range 类承接。 */
.opt-range{flex:0 1 340px;min-width:200px;max-width:400px}

/* ② 页面选择控制条（含范围输入）卡片化：内容垂直居中 + 左右分组，读起来是一个整体 */
.actions:has(.opt-range){
  align-items:center;
  background:var(--surface-2);
  border:1px solid var(--line);
  border-radius:14px;
  padding:13px 16px;
  gap:10px 14px;
  box-shadow:var(--shadow-sm);
}
.actions:has(.opt-range)>.hint{
  flex:1 1 auto;
  min-width:112px;
  font-weight:700;
  font-size:13.5px;
  color:var(--ink-2);
  font-variant-numeric:tabular-nums;
}
.actions:has(.opt-range)>.btn{flex:0 0 auto}

/* ③ 缩略图 / 结果网格在小屏更紧凑：原 120px 最小宽在手机上仅 2 列且留白过多 */
@media (max-width:600px){
  .page-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
  .pg-thumb{padding:6px}
  .pg-thumb .pn{top:-7px;left:-7px}
  .results{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  .actions:has(.opt-range){padding:12px 14px}
  .actions:has(.opt-range)>.hint{flex:1 1 100%;min-width:0}
  .actions:has(.opt-range)>.opt-range{flex:1 1 100%;min-width:0;max-width:none}
}
@media (max-width:400px){
  .page-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ④ 暗色回退（卡片底/描边） */
:root[data-theme="dark"] .actions:has(.opt-range){background:#0e1a30;border-color:#1c2a44}

/* ===== R27: 页面范围输入框即时校验提示 ===== */
.opt .range-warn{margin-top:5px;font-size:12px;line-height:1.45;color:var(--err);
  display:flex;align-items:flex-start;gap:5px}

/* ===== R67: 微交互动效语言统一 =====
   问题根因：scroll-reveal 的 .reveal 规则（transition:opacity .55s,translate .55s）与卡片
   .tool-card/.feature/.step 自身 transition 同为 (0,1,0) 特异度、且 .reveal 定义在后，
   覆盖了卡片 hover 用的 transform 过渡，导致 hover 抬升（translateY(-4px)）瞬间硬跳、无缓动。
   这里在 .reveal 之后重设卡片 transition：保留入场 opacity/translate .55s，并恢复 hover 用的
   transform/box-shadow .18s 缓动，使全站动效语言一致。另给 .drop 的 .over 抬升补 transform
   过渡，统一拖拽区反馈。 */
.tool-card, .feature, .step {
  transition: opacity .55s cubic-bezier(.22,.61,.36,1),
              translate .55s cubic-bezier(.22,.61,.36,1),
              transform .18s ease,
              box-shadow .18s ease,
              border-color .18s ease,
              background .2s ease;
}
.drop { transition: border-color .15s ease, background .15s ease, box-shadow .15s ease, transform .15s ease; }
.opt .range-warn::before{content:"!";flex:0 0 auto;width:14px;height:14px;margin-top:1px;
  border-radius:50%;background:var(--err);color:#fff;font-size:10px;font-weight:700;
  display:inline-flex;align-items:center;justify-content:center}
.opt input[aria-invalid="true"]{border-color:var(--err)}
:root[data-theme="dark"] .opt .range-warn{color:#fca5a5}
:root[data-theme="dark"] .opt input[aria-invalid="true"]{border-color:#f87171}