:root{
  --ink:#0f172a; --ink-2:#475569; --muted:#7b8798; --line:#e5e9f0; --line-2:#d3dae6;
  --bg:#f7f9fc; --card:#ffffff; --soft:#f1f5fb;
  --primary:#2563eb; --primary-2:#4f46e5; --accent:#06b6d4;
  --primary-soft:#eef4ff; --danger:#d7263d; --ok:#0f9d58; --warn:#b45309;
  --radius:18px; --radius-sm:12px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.05);
  --shadow:0 1px 2px rgba(15,23,42,.04), 0 10px 28px -14px rgba(15,23,42,.18);
  --shadow-lg:0 2px 4px rgba(15,23,42,.05), 0 24px 48px -24px rgba(15,23,42,.28);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:var(--bg);
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{letter-spacing:-.01em}
.wrap{width:100%;max-width:1120px;margin:0 auto;padding:0 22px}
.narrow{max-width:780px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:30;
  background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid rgba(15,23,42,.06)}
.header-inner{display:flex;align-items:center;gap:20px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;font-size:17.5px;color:var(--ink)}
.brand:hover{text-decoration:none}
.logo{width:28px;height:28px;color:var(--primary);flex:0 0 auto}
.nav{display:flex;gap:4px;flex-wrap:wrap;font-size:14.5px;margin-left:auto}
.nav a{color:var(--ink-2);padding:7px 12px;border-radius:10px;transition:background .15s,color .15s}
.nav a:hover{background:var(--soft);color:var(--ink);text-decoration:none}
.nav a[aria-current="page"]{color:var(--primary);background:var(--primary-soft);font-weight:650}
.lang-switch{display:flex;gap:6px;font-size:13px}
.lang-switch a{color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:4px 12px;background:#fff;transition:.15s}
.lang-switch a:hover{text-decoration:none;border-color:var(--line-2)}
.lang-switch a[aria-current="true"]{color:var(--primary);border-color:rgba(37,99,235,.35);background:var(--primary-soft);font-weight:600}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:76px 0 60px;
  background:radial-gradient(120% 130% at 78% 0%, #1b3a86 0%, #0d1830 52%, #070d1c 100%);
  color:#fff}
.hero::before{content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(120% 100% at 70% 10%, #000 30%, transparent 78%)}
.hero::after{content:"";position:absolute;width:560px;height:560px;right:-160px;top:-220px;border-radius:50%;
  background:radial-gradient(circle,rgba(59,130,246,.42),transparent 62%)}
.hero .wrap{position:relative;z-index:1}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:.08em;
  text-transform:uppercase;color:#93c5fd;font-weight:650;margin-bottom:18px}
.eyebrow::before{content:"";width:18px;height:1px;background:#93c5fd;opacity:.8}
.hero h1{font-size:clamp(30px,4.6vw,50px);line-height:1.14;margin:0 0 18px;font-weight:800;
  background:linear-gradient(180deg,#fff 30%,#c7d8f8 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:#b9c7de;font-size:17.5px;line-height:1.75;max-width:660px;margin:0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.btn{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:650;
  padding:12px 22px;border-radius:12px;border:1px solid transparent;transition:.16s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,#3b82f6,#4f46e5);color:#fff;
  box-shadow:0 10px 24px -10px rgba(59,130,246,.7)}
.btn-ghost{background:rgba(255,255,255,.08);color:#e6edf9;border-color:rgba(255,255,255,.18)}
.hero-note{margin-top:18px;font-size:13.5px;color:#8fa3c0;display:flex;align-items:center;gap:8px}
.stats{display:flex;gap:34px;flex-wrap:wrap;margin-top:42px;padding-top:26px;
  border-top:1px solid rgba(255,255,255,.12)}
.stat b{display:block;font-size:26px;font-weight:800;letter-spacing:-.02em}
.stat span{font-size:13px;color:#8fa3c0}

/* ---------- sections ---------- */
.section{padding:34px 0}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:14px;
  margin:0 0 20px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.section-head h2{font-size:22px;margin:0;font-weight:750}
.section-head .count{font-size:13.5px;color:var(--muted)}

/* ---------- cards ---------- */
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(248px,1fr))}
.card{position:relative;display:block;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:20px 20px 18px;color:inherit;box-shadow:var(--shadow-sm);
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease}
.card:hover{text-decoration:none;transform:translateY(-3px);border-color:#c9d7ee;
  box-shadow:0 18px 36px -20px rgba(15,23,42,.35)}
.card::after{content:"→";position:absolute;right:20px;bottom:18px;color:#c3cfe2;
  font-size:16px;opacity:0;transform:translateX(-4px);transition:.18s}
.card:hover::after{opacity:1;transform:translateX(0)}
.icon-tile{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;
  font-size:21px;background:linear-gradient(135deg,#eef3ff,#e6ecff);border:1px solid #dfe7f7}
.tool-search{display:flex;align-items:center;gap:11px;background:#fff;border:1px solid var(--line-2);
  border-radius:14px;padding:0 16px;height:54px;box-shadow:var(--shadow-sm);transition:.16s}
.tool-search:focus-within{border-color:#7ea6f0;box-shadow:0 0 0 4px rgba(37,99,235,.1)}
.tool-search svg{width:19px;height:19px;color:var(--muted);flex:0 0 auto}
.tool-search input{border:none;outline:none;flex:1 1 auto;font:inherit;font-size:15.5px;background:transparent}
.search-empty{margin:14px 2px 0;font-size:14px;color:var(--muted)}
.card h3{font-size:16.5px;margin:14px 0 8px;font-weight:700;padding-right:18px}
.card p{margin:0;color:var(--ink-2);font-size:13.8px;line-height:1.65}
.card .hot{display:inline-block;margin-top:12px;font-size:11.5px;letter-spacing:.02em;
  color:#1d4ed8;background:#eaf1ff;border-radius:999px;padding:3px 10px;font-weight:650}

/* ---------- tool page ---------- */
.tool-page{padding:28px 0 6px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}
.tool-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:22px}
.tool-head .icon-tile{width:52px;height:52px;font-size:25px;border-radius:16px;flex:0 0 auto}
.tool-head h1{font-size:clamp(23px,3.2vw,32px);margin:4px 0 8px;font-weight:800}
.tool-head p.lede{color:var(--ink-2);margin:0;font-size:16.5px;line-height:1.7;max-width:760px}

.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);margin-bottom:20px;overflow:hidden}
.panel-head{display:flex;align-items:center;gap:10px;padding:16px 22px;
  border-bottom:1px solid var(--line);background:linear-gradient(180deg,#fbfcfe,#f6f8fc)}
.panel-head h2{font-size:15.5px;margin:0;font-weight:700}
.panel-head .tag{margin-left:auto;font-size:12px;color:#0f766e;background:#e7f7f3;
  border:1px solid #c8ece3;border-radius:999px;padding:3px 10px;font-weight:650}
.panel-body{padding:22px}

.drop{position:relative;border:2px dashed #cbd8ea;border-radius:16px;background:
  radial-gradient(120% 120% at 50% 0%, #fbfdff, #f4f8ff 100%);
  padding:44px 20px;text-align:center;color:var(--ink-2);cursor:pointer;transition:.18s}
.drop:hover,.drop.hover{border-color:var(--primary);background:var(--primary-soft)}
.drop svg{width:38px;height:38px;color:#93b0e0;margin-bottom:12px}
.drop strong{display:block;color:var(--ink);font-size:16.5px;margin-bottom:6px;font-weight:700}
.drop small{color:var(--muted);font-size:13.5px}

.controls{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(196px,1fr));margin-top:4px}
.field{display:flex;flex-direction:column;gap:7px}
.field label{font-size:13px;color:var(--ink-2);font-weight:650;letter-spacing:.01em}
.field-hint{font-size:12px;line-height:1.6;color:#64748b;margin:8px 0 0}
input[type=text],input[type=number],select,textarea{
  font:inherit;font-size:15px;padding:10px 12px;border:1px solid var(--line-2);border-radius:11px;
  background:#fff;color:var(--ink);width:100%;transition:border-color .15s, box-shadow .15s}
input[type=text]:focus,input[type=number]:focus,select:focus,textarea:focus{
  outline:none;border-color:#7ea6f0;box-shadow:0 0 0 3px rgba(37,99,235,.12)}
input[type=range]{width:100%;accent-color:var(--primary)}
input[type=color]{width:100%;height:42px;padding:3px;border:1px solid var(--line-2);
  border-radius:11px;background:#fff;cursor:pointer}
input[type=file]{font:inherit;font-size:14px;color:var(--ink-2);width:100%;padding:6px 0}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:20px}
button{font:inherit;font-size:15px;font-weight:650;border-radius:12px;border:1px solid transparent;
  padding:11px 20px;cursor:pointer;transition:.16s}
button.primary{background:linear-gradient(135deg,#3b82f6,#4f46e5);color:#fff;
  box-shadow:0 10px 22px -12px rgba(59,130,246,.8)}
button.primary:hover:not(:disabled){transform:translateY(-1px)}
button.primary:disabled{background:#c3cfe2;box-shadow:none;cursor:not-allowed}
button.ghost{background:#fff;border-color:var(--line-2);color:var(--ink-2)}
button.ghost:hover{border-color:#a9bdd9;color:var(--ink)}
.hint{font-size:13px;color:var(--muted);margin:12px 0 0;line-height:1.6}
.status{margin-top:14px;font-size:14.5px;color:var(--ink-2);min-height:22px}
.status.error{color:var(--danger)}
.status.ok{color:var(--ok)}
.files{list-style:none;padding:0;margin:16px 0 0;display:grid;gap:8px}
.files li{display:flex;gap:11px;align-items:center;background:#fbfcfe;border:1px solid var(--line);
  border-radius:12px;padding:9px 13px;font-size:14px}
.files .nm{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.files .sz{color:var(--muted);font-size:13px;flex:0 0 auto}
.files .cut{color:var(--danger);font-size:13px;flex:0 0 auto}
.thumb{width:44px;height:44px;border-radius:9px;object-fit:cover;background:#eef2f7;flex:0 0 auto}
.preview{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));margin-top:16px}
.preview figure{margin:0;background:#fbfcfe;border:1px solid var(--line);border-radius:12px;
  padding:10px;text-align:center}
.preview img{max-height:170px;border-radius:8px;background:#fff}
.preview figcaption{font-size:12.5px;color:var(--muted);margin-top:8px;word-break:break-all}
.progress{height:8px;border-radius:999px;background:#e8eef7;overflow:hidden;margin-top:14px;display:none}
.progress.show{display:block}
.progress > i{display:block;height:100%;background:linear-gradient(90deg,#3b82f6,#4f46e5);
  width:0;transition:width .2s}
.result-box{margin-top:18px;padding:16px;border:1px solid #cfe9dd;background:#f5fcf8;
  border-radius:14px;display:none}
.result-box.show{display:block}
.trust{display:flex;align-items:flex-start;gap:9px;margin-top:16px;padding:11px 14px;
  background:#f6f9fe;border:1px solid #e3ebf7;border-radius:12px;
  font-size:13px;color:var(--ink-2);line-height:1.6}
.trust svg{width:16px;height:16px;flex:0 0 auto;color:#0f766e;margin-top:2px}

/* ---------- content ---------- */
.content{padding:8px 0 44px}
.content h1{font-size:clamp(24px,3.4vw,32px);line-height:1.32;margin:6px 0 16px;font-weight:800}
.content h2{font-size:20px;margin:34px 0 12px;font-weight:750;padding-left:12px;
  border-left:3px solid var(--primary);line-height:1.4}
.content h3{font-size:16.5px;margin:24px 0 8px;font-weight:700}
.content p,.content li{color:var(--ink-2);line-height:1.8}
.content ol,.content ul{padding-left:22px}
.content li{margin:7px 0}
.content code{background:#f1f5f9;padding:2px 6px;border-radius:5px;font-size:.9em;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#0f172a}
.content blockquote{border-left:3px solid var(--primary);background:#f4f8ff;margin:18px 0;
  padding:13px 17px;border-radius:0 12px 12px 0;color:var(--ink-2)}
.code{background:#0f172a;color:#e2e8f0;padding:17px 19px;border-radius:12px;overflow-x:auto;
  font-size:13.5px;line-height:1.65;margin:18px 0}
.code code{background:none;padding:0;color:inherit;font-size:inherit}
.faq{display:grid;gap:10px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:13px;padding:13px 16px;
  transition:border-color .15s}
.faq details[open]{border-color:#c9d7ee;box-shadow:var(--shadow-sm)}
.faq summary{cursor:pointer;font-weight:650;color:var(--ink);font-size:15px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";display:inline-block;width:18px;color:var(--primary);font-weight:700}
.faq details[open] summary::before{content:"–"}
.faq details p{margin:10px 0 2px;color:var(--ink-2);font-size:14.5px}
.cta{background:linear-gradient(135deg,#f2f7ff,#eef2fb);border:1px solid #dae6f7;
  border-radius:var(--radius);padding:22px;margin:28px 0}
.cta h3{margin:0 0 8px;font-size:17px}
.table-plain{width:100%;border-collapse:collapse;font-size:14.5px;margin:0}
.table-plain th,.table-plain td{border-bottom:1px solid var(--line);padding:10px 9px;
  text-align:left;color:var(--ink-2)}
.table-plain th{color:var(--ink);font-size:13px;font-weight:700;background:#fafbff}
.table-wrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:12px}
.notice{border-left:3px solid var(--primary);background:#f4f8ff;padding:13px 16px;
  border-radius:0 12px 12px 0;color:var(--ink-2);font-size:14.5px;margin:18px 0}
.notice.warn{border-color:var(--warn);background:#fff8ec}
.ad-slot{margin:22px 0;min-height:0}

/* ---------- small widgets ---------- */
.chk{display:flex;align-items:center;gap:9px;font-size:14.5px;color:var(--ink-2)}
.chk input{width:auto;accent-color:var(--primary)}
.field output{font-size:12.5px;color:var(--muted)}
.wm-preview{border:1px solid var(--line);border-radius:12px;
  background:linear-gradient(135deg,#2b3648,#4a5568 55%,#334155);
  height:120px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:6px}
.wm-preview span{font-weight:650;letter-spacing:.5px;white-space:nowrap}
.swatches{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.swatch{border:1px solid var(--line);border-radius:9px;padding:7px 11px;font-size:12.5px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;cursor:pointer;color:#fff;
  text-shadow:0 1px 2px rgba(0,0,0,.5);min-width:78px;text-align:center}
.pick-canvas{max-width:100%;border:1px solid var(--line);border-radius:12px;background:#fff;
  cursor:crosshair;touch-action:none}
.sheet-preview{border:1px solid var(--line);border-radius:12px;background:#fff;max-width:100%}
.rect-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.rect-chip{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:999px;
  padding:5px 8px 5px 12px;font-size:12.5px;color:var(--ink-2);background:#fff}
.rect-chip button{border:none;background:transparent;color:var(--danger);font-size:14px;
  line-height:1;padding:2px 4px;cursor:pointer}
.status-table{width:100%;border-collapse:collapse;font-size:14.5px;margin-top:12px}
.status-table th,.status-table td{border-bottom:1px solid var(--line);padding:10px 8px;
  text-align:left;vertical-align:top}
.status-table th{width:38%;color:var(--ink-2);font-weight:650;font-size:13.5px}

/* ---------- footer ---------- */
.site-footer{margin-top:52px;background:#0b1220;color:#94a3b8;padding:40px 0 44px}
.footer-inner{display:grid;gap:12px}
.footer-brand{font-weight:700;color:#e2e8f0}
.footer-nav{display:flex;gap:18px;flex-wrap:wrap;font-size:14px}
.footer-nav a{color:#94a3b8}
.footer-nav a:hover{color:#e2e8f0;text-decoration:none}
.footer-note,.footer-copy{color:#64748b;font-size:13px;margin:0}

@media (max-width:720px){
  .header-inner{flex-wrap:wrap;min-height:58px;padding-top:7px;padding-bottom:5px;row-gap:2px;column-gap:10px}
  .brand{order:1}
  .lang-switch{order:2;margin-left:auto}
  .nav{order:3;display:flex;width:100%;margin-left:0;gap:0;overflow-x:auto;
    scrollbar-width:none;padding-bottom:2px}
  .nav::-webkit-scrollbar{display:none}
  .nav a{padding:6px 10px;font-size:13.5px;white-space:nowrap}
  .hero{padding:44px 0 38px}
  .hero-note{display:none}
  .hero h1{font-size:clamp(26px,7.2vw,34px)}
  .hero p{font-size:16px;line-height:1.72}
  .hero-actions{margin-top:24px;gap:10px}
  .btn{padding:11px 18px;font-size:14.5px}
  .stats{display:grid;grid-template-columns:1fr 1fr;gap:20px 16px;margin-top:30px;padding-top:22px}
  .stat b{font-size:22px}
  .stat span{font-size:12.5px}
  .panel-body{padding:16px}
  .tool-head{gap:12px}
  .tool-head .icon-tile{width:44px;height:44px;font-size:21px}
  .tool-head p.lede{font-size:15.5px}
  .drop{padding:34px 16px}
  .content h2{font-size:18.5px}
}