/* ============================================================
   CodeBox 码盒 — v7 设计系统（科技蓝 · 顶部导航）
   参考 qrfy / myqrcode / the-qrcode-generator 的头部布局：
   顶部导航 + 大 hero + CTA + 信任数据 + 3 步 + 长尾类型 + FAQ
   主色科技蓝 #2f7cf6，深海军蓝底，渐变 CTA，6 工具彩色
   ============================================================ */
:root{
  --bg:#081120;
  --panel:#0d1a2e;
  --panel2:#13233c;
  --line:#1e3350;
  --line2:#33517a;
  --ink:#eef4fd;
  --muted:#9db2d0;
  --faint:#5f7796;
  --accent:#2f7cf6;
  --accent2:#38bdf8;
  --accent-soft:rgba(47,124,246,.14);
  --accent-ink:#ffffff;
  --t1:#38bdf8; --t2:#34d399; --t3:#a78bfa; --t4:#fbbf24; --t5:#f472b6; --t6:#fb7185;
  --grad-blue:linear-gradient(135deg,#38bdf8,#2f7cf6);
  --grad-deep:linear-gradient(135deg,#2f7cf6,#6d28d9);
  --grid:rgba(96,165,250,.025);
  --glow:rgba(47,124,246,.07);
  --mono:'JetBrains Mono','SFMono-Regular',Consolas,'Cascadia Code','Noto Sans SC',monospace;
  --sans:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  --r:14px; --r-s:10px;
  --sh:0 1px 2px rgba(2,8,20,.6),0 1px 1px rgba(2,8,20,.4);
  --sh-lg:0 22px 48px -18px rgba(2,8,20,.9),0 6px 16px rgba(2,8,20,.45);
  --tbh:60px;
}
html[data-theme="light"]{
  --bg:#f4f8fd;
  --panel:#ffffff;
  --panel2:#e9f1fb;
  --line:#d9e5f2;
  --line2:#b9cde4;
  --ink:#101a2b;
  --muted:#54687f;
  --faint:#8497ad;
  --accent:#2563eb;
  --accent2:#0284c7;
  --accent-soft:rgba(37,99,235,.1);
  --accent-ink:#ffffff;
  --t1:#0284c7; --t2:#059669; --t3:#7c3aed; --t4:#b45309; --t5:#db2777; --t6:#e11d48;
  --grad-blue:linear-gradient(135deg,#38bdf8,#2563eb);
  --grad-deep:linear-gradient(135deg,#2563eb,#7c3aed);
  --grid:rgba(30,80,160,.028);
  --glow:rgba(37,99,235,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:clip}
body{
  margin:0;font-family:var(--sans);background:var(--bg);color:var(--ink);
  font-size:14.5px;line-height:1.58;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:clip;
  background-image:
    radial-gradient(1000px 520px at 78% -10%, rgba(47,124,246,.08), transparent 62%),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size:auto,44px 44px,44px 44px;
  background-attachment:fixed;
}
a{color:inherit}
button{font-family:inherit}
svg{display:block}
::selection{background:var(--accent);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--line2);border-radius:8px;border:2px solid var(--bg)}
::-webkit-scrollbar-track{background:transparent}

/* ============================================================
   顶部导航（参考站布局）
   ============================================================ */
/* topbar：每个页面底部都有细线与内容区隔开（stuck 时加深） */
.topbar{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb,var(--bg) 72%,transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:border-color .2s,background .2s;
}
.topbar.stuck{border-bottom-color:var(--line2);background:color-mix(in srgb,var(--bg) 88%,transparent)}
.topbar-inner{max-width:1280px;margin:0 auto;height:var(--tbh);display:flex;align-items:center;gap:16px;padding:0 20px}
.tb-spacer{display:none}

/* brand */
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;flex:none}
.brand .bars{flex:none;width:34px;height:34px;border-radius:9px;background:var(--grad-blue);display:grid;place-items:center;color:#fff;box-shadow:0 4px 14px rgba(47,124,246,.4),inset 0 1px 0 rgba(255,255,255,.35)}
.brand-t{display:flex;flex-direction:column;line-height:1.05}
.bn{font-weight:850;font-size:15px;letter-spacing:.01em;background:linear-gradient(120deg,var(--ink),var(--accent2));-webkit-background-clip:text;background-clip:text}
.bs{font-family:var(--mono);font-size:8.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--accent);font-weight:800;opacity:.85}

/* top nav（桌面）+ 二级下拉（单列，防串列） */
.nav{display:flex;align-items:center;gap:4px;flex:none}
.topbar .nav{margin:0 auto}
.nav-item,.nav-link{
  position:relative;padding:8px 13px;border-radius:9px;font-size:12.5px;font-weight:650;color:var(--muted);
  text-decoration:none;min-height:38px;display:flex;align-items:center;gap:5px;white-space:nowrap;
  transition:color .15s,background .15s,transform .15s,box-shadow .15s;
}
.nav-item::after,.nav-link::after{
  content:"";position:absolute;left:13px;right:13px;bottom:4px;height:2px;border-radius:2px;
  background:var(--grad-blue);transform:scaleX(0);transform-origin:left;transition:transform .22s cubic-bezier(.2,.7,.3,1);
}
.nav-item:hover,.nav-link:hover{color:var(--ink);background:var(--accent-soft)}
.nav-item:hover::after,.nav-link:hover::after{transform:scaleX(1)}
.nav-item:active,.nav-link:active{transform:scale(.97)}
.nav-item.active,.nav-link.active{color:#fff;background:var(--grad-blue);box-shadow:0 4px 14px rgba(47,124,246,.4)}
.nav-item.active::after,.nav-link.active::after{display:none}
html[data-theme="light"] .nav-item.active,html[data-theme="light"] .nav-link.active{color:#fff}
.nav-item svg{flex:none;opacity:.75}

/* top search */
.sb-search{display:flex;align-items:center;gap:7px;background:var(--panel2);border:1px solid var(--line);border-radius:9px;padding:6px 10px;transition:border-color .15s,box-shadow .15s}
.topbar .sb-search{width:170px;flex:none}
.sb-search:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.sb-search svg{flex:none;color:var(--faint)}
.sb-search input{border:0;background:none;outline:none;flex:1;min-width:0;font-size:12.5px;color:var(--ink)}
.sb-search input::placeholder{color:var(--faint)}

/* lang + theme */
.langbar{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;flex:none;background:var(--panel)}
.langbar a{padding:5px 10px;font-size:11px;font-weight:700;font-family:var(--mono);color:var(--muted);text-decoration:none;min-height:30px;display:flex;align-items:center;transition:background .12s,color .12s}
.langbar a:hover{background:var(--panel2);color:var(--ink)}
.langbar a.on{background:var(--grad-blue);color:#fff}
.iconbtn{flex:none;width:34px;height:34px;border-radius:9px;border:1px solid var(--line);background:var(--panel);color:var(--muted);display:grid;place-items:center;cursor:pointer;transition:all .12s}
.iconbtn:hover{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 45%,var(--line));background:var(--panel2)}
.menu-btn{display:none}

/* ============================================================
   移动端抽屉（复用 .sidebar 类，JS 逻辑不变）
   ============================================================ */
.scrim{position:fixed;inset:0;background:rgba(3,10,24,.7);backdrop-filter:blur(2px);z-index:55;opacity:0;pointer-events:none;transition:opacity .2s}
html[data-theme="light"] .scrim{background:rgba(20,40,80,.4)}
.scrim.show{opacity:1;pointer-events:auto}
.sidebar{position:fixed;top:0;bottom:0;left:0;width:min(300px,86vw);z-index:60;
  background:var(--panel);border-right:1px solid var(--line);
  display:flex;flex-direction:column;gap:10px;padding:16px 14px;
  transform:translateX(-103%);transition:transform .22s ease;box-shadow:none;overflow-y:auto}
.sidebar.open{transform:none;box-shadow:var(--sh-lg)}
.sidebar .sb-search{width:100%}
.sidebar .nav{flex-direction:column;align-items:stretch;gap:3px;flex:1}
.sidebar .nav-group{font-family:var(--mono);font-size:9.5px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--faint);padding:10px 9px 5px}
.sidebar .nav-item{display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:9px;font-size:13.5px;font-weight:600;color:var(--muted);text-decoration:none;min-height:40px;border:1px solid transparent;transition:background .12s,color .12s}
.sidebar .nav-item svg{flex:none;opacity:.75}
.sidebar .nav-item:hover{background:var(--panel2);color:var(--ink)}
.sidebar .nav-item.active{background:var(--accent-soft);border-color:color-mix(in srgb,var(--accent) 30%,transparent);color:var(--ink);font-weight:700;box-shadow:inset 3px 0 0 var(--accent)}
.sidebar .nav-item.active svg{opacity:1;color:var(--accent)}
/* mobile accordion (drawer) */
.dgroup{display:flex;flex-direction:column}
.drow{display:flex;align-items:center;gap:2px}
.drow .nav-item{flex:1;min-width:0}
.drow .nav-item span{overflow:hidden;text-overflow:ellipsis}
.dtoggle{
  flex:none;width:34px;height:40px;display:grid;place-items:center;border:0;border-radius:8px;cursor:pointer;
  background:transparent;color:var(--muted);transition:background .12s,color .12s;
}
.dtoggle:hover{background:var(--panel2);color:var(--ink)}
.dtoggle svg{transition:transform .2s}
.dgroup.open .dtoggle svg{transform:rotate(180deg);color:var(--accent)}
.dsub{display:none;flex-direction:column;gap:1px;padding:2px 0 4px 14px;margin-left:17px;border-left:1px solid var(--line)}
.dgroup.open .dsub{display:flex}
.dsub-i{padding:7px 10px;font-size:12.5px;min-height:34px}
.dsub-i.active{background:var(--accent-soft);color:var(--ink);border-color:color-mix(in srgb,var(--accent) 30%,transparent);box-shadow:inset 2px 0 0 var(--accent)}
.side-note{padding:11px 13px;background:linear-gradient(135deg,var(--panel2),color-mix(in srgb,var(--accent) 10%,var(--panel2)));border:1px solid color-mix(in srgb,var(--accent) 26%,var(--line));border-radius:10px;font-size:11px;line-height:1.6;color:var(--muted)}
.side-note b{color:var(--accent2);font-family:var(--mono);font-weight:700}

/* ============================================================
   HERO — 居中大标题 + CTA + 信任数据 + QR 背景
   ============================================================ */
main{display:flex;flex-direction:column;min-height:calc(100vh - var(--tbh))}
.content{flex:1;width:100%;max-width:1180px;margin:0 auto;padding:0 24px 56px}
.hero{
  position:relative;overflow:hidden;
  padding:64px 24px 40px;margin:0 -24px;
  display:flex;flex-direction:column;align-items:center;text-align:center;
}
.hero::before{
  content:"";position:absolute;left:0;right:0;bottom:0;height:90px;
  background:linear-gradient(transparent,var(--bg));pointer-events:none;z-index:1;
}
.hero::after{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;z-index:2;
  background:linear-gradient(90deg,transparent,var(--accent) 30%,var(--accent2) 70%,transparent);opacity:.8;
}
.hero-inner{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center}
.hero .eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent2);background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 40%,transparent);padding:6px 15px;border-radius:99px;margin-bottom:20px;box-shadow:0 0 22px rgba(47,124,246,.18)}
html[data-theme="light"] .hero .eyebrow{box-shadow:none}
.hero .eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent2);animation:blink 2.2s ease-in-out infinite;box-shadow:0 0 8px var(--accent2)}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}
.hero h1{
  margin:0;font-size:clamp(32px,5.2vw,56px);line-height:1.1;font-weight:900;letter-spacing:-.03em;max-width:16em;text-align:center;text-wrap:balance;
  background:linear-gradient(115deg,var(--ink) 20%,var(--accent2) 55%,var(--accent) 85%);
  background-size:170% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:titleShift 9s ease-in-out infinite alternate;
}
@keyframes titleShift{0%{background-position:0% 0}100%{background-position:85% 0}}
.hero p{margin:16px 0 0;color:var(--muted);font-size:15.5px;max-width:62ch;text-align:center}
.hero-cta{position:relative;z-index:2;display:flex;gap:10px;margin-top:26px;flex-wrap:wrap;justify-content:center}
.cta{
  display:inline-flex;align-items:center;gap:8px;text-decoration:none;
  font-size:14.5px;font-weight:800;letter-spacing:.01em;
  padding:12px 26px;border-radius:11px;color:#fff;
  background:var(--grad-blue);border:1px solid transparent;
  box-shadow:0 8px 26px rgba(47,124,246,.4),inset 0 1px 0 rgba(255,255,255,.35);
  transition:transform .15s,box-shadow .15s,filter .15s;
}
.cta:hover{transform:translateY(-2px);box-shadow:0 12px 34px rgba(47,124,246,.55),inset 0 1px 0 rgba(255,255,255,.4);filter:brightness(1.06)}
.cta svg{transition:transform .15s}
.cta:hover svg{transform:translateX(3px)}
.cta.ghost{background:transparent;color:var(--ink);border:1px solid var(--line2);box-shadow:none}
.cta.ghost:hover{border-color:var(--accent);color:var(--accent2);box-shadow:0 0 0 3px var(--accent-soft);transform:translateY(-2px)}
.stats{position:relative;z-index:2;display:flex;flex-wrap:wrap;justify-content:center;gap:10px 34px;margin:30px auto 0;padding:14px 26px;background:color-mix(in srgb,var(--panel) 90%,transparent);border:1px solid color-mix(in srgb,var(--accent) 22%,var(--line));border-radius:var(--r-s);box-shadow:var(--sh),inset 0 1px 0 rgba(255,255,255,.05);backdrop-filter:blur(6px)}
.stat{display:flex;align-items:baseline;gap:8px}
.stat b{font-family:var(--mono);font-size:16.5px;font-weight:800;color:var(--accent2);font-variant-numeric:tabular-nums}
.stat span{font-size:12px;color:var(--muted)}

/* hero QR matrix（动态背景，居中偏后） */
.hero-qr{
  position:absolute;z-index:0;
  top:46%;left:50%;transform:translate(-50%,-50%);
  width:min(560px,64vw);height:auto;color:var(--accent);
  opacity:.16;
  filter:drop-shadow(0 0 30px rgba(47,124,246,.35));
  -webkit-mask-image:radial-gradient(90% 90% at 50% 50%, #000 30%, transparent 75%);
  mask-image:radial-gradient(90% 90% at 50% 50%, #000 30%, transparent 75%);
}
.hero-qr .fq{stroke:var(--t1);stroke-width:14;opacity:.65}
.hero-qr .fq:nth-of-type(2){stroke:var(--t3)}
.hero-qr .fq:nth-of-type(3){stroke:var(--accent2)}
.hero-qr .fi{fill:var(--t1);opacity:.65}
.hero-qr .fi:nth-of-type(2){fill:var(--t3)}
.hero-qr .fi:nth-of-type(3){fill:var(--accent2)}
.hero-qr .dc{fill:var(--accent)}
.hero-qr .dc.a{fill:var(--t1);animation:pulse 3.6s ease-in-out infinite}
.hero-qr .dc.b{fill:var(--t3);animation:pulse 3.6s ease-in-out 1.2s infinite}
.hero-qr .dc.c{fill:var(--accent2);animation:pulse 3.6s ease-in-out 2.4s infinite}
.hero-qr .dc.t{opacity:.22}
@keyframes pulse{0%,100%{opacity:.1}50%{opacity:.85}}
.hero-qr .beam{animation:beam 5.5s linear infinite}
@keyframes beam{0%{transform:translateX(-30px)}100%{transform:translateX(410px)}}

/* ============================================================
   滚动渐显
   ============================================================ */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---------- section head ---------- */
.sec-head{display:flex;align-items:baseline;gap:12px;margin:40px 0 16px}
.sec-head h2{margin:0;font-size:20px;font-weight:850;letter-spacing:-.01em;display:flex;align-items:center;gap:10px}
.sec-head h2::before{content:"";width:22px;height:4px;border-radius:3px;background:var(--grad-blue);flex:none}
.sec-head span{font-family:var(--mono);font-size:12px;color:var(--faint)}

/* ---------- tool grid（产品前置，彩色卡） ---------- */
.tool-grid-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}
.tool-link{
  position:relative;display:flex;flex-direction:column;gap:11px;
  background:linear-gradient(180deg, color-mix(in srgb,var(--tc,var(--accent)) 10%,var(--panel)) 0%, var(--panel) 170px);
  border:1px solid var(--line);border-radius:var(--r);
  padding:18px;text-decoration:none;box-shadow:var(--sh),inset 0 1px 0 rgba(255,255,255,.05);
  transition:transform .16s,border-color .16s,box-shadow .16s;overflow:hidden;
}
.tool-link::before{
  content:"";position:absolute;top:0;bottom:0;left:-30%;width:26%;
  background:linear-gradient(100deg, transparent, color-mix(in srgb,var(--tc,var(--accent)) 20%,transparent), transparent);
  transform:skewX(-18deg);transition:left .5s ease;pointer-events:none;
}
.tool-link::after{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--tc,var(--accent)),transparent 70%);opacity:0;transition:opacity .18s}
.tool-link:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--tc,var(--accent)) 55%,var(--line));box-shadow:var(--sh-lg),0 14px 34px -12px color-mix(in srgb,var(--tc,var(--accent)) 40%,transparent)}
.tool-link:hover::before{left:110%}
.tool-link:hover::after{opacity:1}
.tool-link .idx{position:absolute;right:14px;top:12px;font-family:var(--mono);font-size:24px;font-weight:800;color:color-mix(in srgb,var(--tc,var(--accent)) 28%,var(--line));letter-spacing:-.02em;transition:color .16s;user-select:none}
.tool-link:hover .idx{color:var(--tc,var(--accent))}
.tool-link .ic{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,color-mix(in srgb,var(--tc,var(--accent)) 28%,transparent),color-mix(in srgb,var(--tc,var(--accent)) 8%,transparent));color:var(--tc,var(--ink));display:grid;place-items:center;transition:background .16s,color .16s,box-shadow .16s}
.tool-link:hover .ic{background:linear-gradient(135deg,var(--tc,var(--accent)),color-mix(in srgb,var(--tc,var(--accent)) 55%,var(--t3)));color:#fff;box-shadow:0 6px 18px color-mix(in srgb,var(--tc,var(--accent)) 45%,transparent)}
.tool-link b{display:block;font-size:15px;font-weight:750;letter-spacing:-.01em}
.tool-link span{display:block;font-size:12.5px;color:var(--muted);line-height:1.55;margin-top:3px}
.tool-link .go{position:absolute;right:14px;bottom:12px;color:var(--faint);opacity:0;transform:translateX(-5px);transition:all .16s}
.tool-link:hover .go{opacity:1;transform:none;color:var(--tc,var(--accent))}

/* ---------- long-tail type chips（长尾类型区） ---------- */
.types-sec{margin-top:34px}
.type-group{display:flex;flex-direction:column;gap:8px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-s);padding:13px 15px;box-shadow:var(--sh)}
.type-group h3{margin:0;font-size:13.5px;font-weight:750;display:flex;align-items:center;gap:8px}
.type-group h3 svg{color:var(--accent2)}
.type-chips{display:flex;flex-wrap:wrap;gap:7px}
.tchip{
  display:inline-flex;align-items:center;font-size:12px;font-weight:600;color:var(--muted);
  background:var(--panel2);border:1px solid var(--line);border-radius:99px;padding:5px 12px;
  text-decoration:none;transition:all .13s;
}
.tchip:hover{color:#fff;background:var(--accent);border-color:var(--accent);box-shadow:0 4px 12px rgba(47,124,246,.35)}
html[data-theme="light"] .tchip:hover{color:#fff}

/* ---------- how-to steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin-top:16px}
.step{
  position:relative;background:linear-gradient(160deg,var(--panel),color-mix(in srgb,var(--accent) 7%,var(--panel)));
  border:1px solid var(--line);border-radius:var(--r-s);
  padding:16px 16px 14px;display:flex;flex-direction:column;gap:5px;overflow:hidden;
}
.step::after{content:"";position:absolute;right:-18px;top:-18px;width:64px;height:64px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 16%,transparent),transparent 70%)}
.step-n{font-family:var(--mono);font-size:20px;font-weight:800;background:var(--grad-blue);-webkit-background-clip:text;background-clip:text;color:transparent}
.step b{font-size:14.5px;font-weight:750;letter-spacing:-.01em}
.step-d{font-size:12.5px;color:var(--muted);line-height:1.6}

/* ---------- trust badges（工具页） ---------- */
.trust{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 0}
.trust span{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.03em;
  color:var(--muted);background:var(--panel2);border:1px solid var(--line);
  border-radius:99px;padding:5px 12px;
}
.trust span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent2);box-shadow:0 0 6px var(--accent2)}

/* ---------- article / seo ---------- */
.article{max-width:880px;margin-top:34px;padding-top:22px;border-top:1px solid var(--line)}
.article h2{font-size:18px;font-weight:800;margin:24px 0 8px;letter-spacing:-.01em}
.article h2:first-child{margin-top:0}
.article h2::before{content:"";display:inline-block;width:14px;height:4px;border-radius:2px;background:var(--grad-blue);margin-right:9px;vertical-align:middle}
.article h3{font-size:14.5px;font-weight:700;margin:16px 0 5px;color:var(--ink)}
.article p{margin:8px 0;color:var(--muted)}
.article ul,.article ol{margin:8px 0 8px 20px;padding:0;color:var(--muted)}
.article li{margin:4px 0}
.article code{font-family:var(--mono);font-size:.9em;background:var(--panel2);border:1px solid var(--line);border-radius:4px;padding:1px 5px}
.article a{color:var(--accent2);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px}
.article a:hover{color:var(--ink)}
.article table{width:100%;border-collapse:collapse;margin:10px 0;font-size:13px}
.article th,.article td{border:1px solid var(--line);padding:6px 9px;text-align:left}
.article th{background:var(--panel2);font-weight:700}

/* variant breadcrumb chips */
.variant-crumb{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin:14px 0 4px}
.variant-crumb>span{font-size:12.5px;color:var(--faint);font-weight:600}
.vchip{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;color:var(--muted);background:var(--panel);border:1px solid var(--line);border-radius:99px;padding:5px 12px;text-decoration:none;transition:all .12s}
.vchip:hover{color:#fff;background:var(--accent);border-color:var(--accent)}
html[data-theme="light"] .vchip:hover{color:#fff}
.vchip.on{background:var(--grad-blue);border-color:transparent;color:#fff}

/* ---------- FAQ ---------- */
.faq-sec{margin-top:30px;max-width:880px}
.faq-sec>h2{font-size:18px;font-weight:850;margin:0 0 12px;display:flex;align-items:center;gap:10px}
.faq-sec>h2::before{content:"";width:14px;height:4px;border-radius:2px;background:var(--grad-blue);flex:none}
.faq-item{background:var(--panel);border:1px solid var(--line);border-radius:10px;margin-bottom:8px;overflow:hidden;box-shadow:var(--sh);transition:border-color .15s,box-shadow .15s}
.faq-item[open]{border-color:color-mix(in srgb,var(--accent) 45%,var(--line));box-shadow:0 8px 22px -10px color-mix(in srgb,var(--accent) 35%,transparent)}
.faq-item summary{cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 15px;font-weight:650;font-size:13.5px;min-height:40px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-plus{flex:none;width:20px;height:20px;border-radius:50%;border:1.5px solid var(--line2);position:relative;transition:all .15s}
.faq-plus::before,.faq-plus::after{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:var(--muted);transition:transform .18s,background .18s}
.faq-plus::before{width:8px;height:1.5px}.faq-plus::after{width:1.5px;height:8px}
.faq-item[open] .faq-plus{border-color:var(--accent);background:var(--accent-soft)}
.faq-item[open] .faq-plus::after{transform:translate(-50%,-50%) scaleY(0)}
.faq-item[open] .faq-plus::before{background:var(--accent2)}
.faq-a{padding:0 15px 13px;color:var(--muted);font-size:13.5px;line-height:1.65}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);margin-top:auto;padding:14px 24px;display:flex;flex-wrap:wrap;align-items:center;gap:6px 18px;font-size:12px;color:var(--faint)}
footer a{color:var(--muted);text-decoration:none}
footer a:hover{color:var(--accent2)}
footer .grow{flex:1}

/* ============================================================
   TOOL PANELS
   ============================================================ */
.tool-head{margin:4px 0 12px}
.tool-head h1{margin:0;font-size:clamp(21px,2.6vw,28px);font-weight:850;letter-spacing:-.02em}
.tool-head h1::before{content:"";display:inline-block;width:16px;height:5px;border-radius:3px;background:var(--grad-blue);margin-right:10px;vertical-align:middle}
.tool-head p{margin:6px 0 0;color:var(--muted);font-size:14px;max-width:66ch}
.tool-grid{display:grid;grid-template-columns:minmax(310px,5fr) minmax(310px,6fr);gap:14px;align-items:start;margin-top:12px}
.card-panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:15px;box-shadow:var(--sh),inset 0 1px 0 rgba(255,255,255,.05)}
.preview-wrap{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:15px;box-shadow:var(--sh),inset 0 1px 0 rgba(255,255,255,.05);display:flex;flex-direction:column;gap:11px}

/* forms */
.form{display:flex;flex-direction:column;gap:10px}
.f{display:flex;flex-direction:column;gap:4px;font-size:12.5px;font-weight:650;color:var(--muted);min-width:0}
.f>span{display:flex;align-items:center;gap:6px}
.f>span b{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--accent2)}
.f input,.f select,.f textarea{font-family:inherit;font-size:13.5px;font-weight:500;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:var(--r-s);padding:8px 10px;transition:border-color .13s,box-shadow .13s,background .13s;width:100%;min-height:36px}
.f textarea{resize:vertical;line-height:1.45}
.f input:hover,.f select:hover,.f textarea:hover{border-color:var(--line2)}
.f input:focus,.f select:focus,.f textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);background:var(--panel)}
.f input[type=color]{padding:3px 5px;width:42px;height:34px;cursor:pointer}
.f input[type=range]{padding:0;border:0;background:none;box-shadow:none;accent-color:var(--accent);min-height:24px}
.f select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 15px) 55%,calc(100% - 10px) 55%;background-size:5px 5px;background-repeat:no-repeat;padding-right:28px}
.frow{display:flex;gap:10px}
.frow .f{flex:1;min-width:0}
.check{display:flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;color:var(--muted);cursor:pointer;min-height:30px}
.check input{width:16px;height:16px;accent-color:var(--accent);cursor:pointer}
.hint{font-size:11.5px;color:var(--faint);margin:2px 0 0;line-height:1.5}
.hint.steps{font-size:12.5px;color:var(--muted);background:var(--accent-soft);border:1px solid var(--line);border-radius:9px;padding:9px 12px;margin:0 0 12px;line-height:1.6}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);opacity:0}
.f .vh{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);opacity:0;margin:0}
/* card template gallery (visual swatches) */
.tpl-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:6px}
.tpl{position:relative;display:flex;align-items:flex-end;min-height:56px;border-radius:8px;border:2px solid var(--line);cursor:pointer;overflow:hidden;padding:0 8px 5px;font:inherit;font-size:11px;font-weight:600;color:var(--muted);text-align:left;background:#fff;transition:border-color .15s,box-shadow .15s,transform .12s}
.tpl::before{content:'';position:absolute;left:0;right:0;top:0;bottom:19px;pointer-events:none}
.tpl:hover{transform:translateY(-1px)}
.tpl.active{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.tpl.t0::before{background:linear-gradient(90deg,#fff 0 74%,#0f766e 74%)}
.tpl.t1{background:#111827;color:#d1d5db}
.tpl.t1::before{background:linear-gradient(90deg,#1f2937 0 74%,#2dd4bf 74%)}
.tpl.t2{background:#fff7ed}
.tpl.t2::before{background:linear-gradient(90deg,#ea580c 0 26%,#fff7ed 26%)}
.tpl.t3{background:#eef2ff}
.tpl.t3::before{background:linear-gradient(90deg,#e0e7ff 0 74%,#4f46e5 74%)}
.tpl.t4::before{background:#fff}
.tpl.t4::after{content:'';position:absolute;left:8px;bottom:26px;width:26px;height:3px;border-radius:2px;background:#2f7cf6}
.tpl.t5::before{background:linear-gradient(135deg,#2f7cf6 0%,#22d3ee 100%)}
.tpl.t6::before{background:linear-gradient(90deg,#0f766e 0 46%,#fff 46%)}
.tpl.t7{background:#f8fafc}
.tpl.t7::before{background:linear-gradient(135deg,#f8fafc 0 62%,#f59e0b 120%)}
/* QR beautifier */
.bq-presets{display:flex;flex-wrap:wrap;gap:7px;margin:4px 0 10px}
.chip{border:1px solid var(--line);background:var(--panel2);color:var(--ink);font:inherit;font-size:12px;font-weight:600;padding:5px 11px;border-radius:999px;cursor:pointer;transition:border-color .15s,background .15s,transform .12s}
.chip:hover{border-color:var(--accent);transform:translateY(-1px)}
.bq-warn{margin:6px 0 0;padding:8px 11px;border-radius:9px;font-size:12.5px;line-height:1.6;border:1px solid var(--line)}
.bq-warn.warn{background:rgba(245,158,11,.1);border-color:rgba(245,158,11,.45);color:#92400e}
.bq-warn.danger{background:rgba(239,68,68,.1);border-color:rgba(239,68,68,.5);color:#b91c1c}
html[data-theme="dark"] .bq-warn.warn{color:#fbbf24}
html[data-theme="dark"] .bq-warn.danger{color:#f87171}
.bq-scanres{margin:10px 0 0;font-size:13px;font-weight:600}
.bq-scanres.ok{color:#15803d}
.bq-scanres.bad{color:#b91c1c}
html[data-theme="dark"] .bq-scanres.ok{color:#4ade80}
html[data-theme="dark"] .bq-scanres.bad{color:#f87171}
#bq-preview svg{max-width:100%;height:auto}
fieldset.plain{border:1px solid var(--line);border-radius:9px;padding:11px 12px 13px;margin:0}
fieldset.plain legend{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);padding:0 7px}
fieldset.qrf{display:none;border:1px solid var(--line);border-radius:9px;padding:11px 12px 13px;margin:0}
fieldset.qrf.on{display:block}
fieldset.qrf legend{font-size:11.5px;font-weight:700;color:var(--ink);padding:0 5px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:8px;padding:8px 13px;font-size:13px;font-weight:650;cursor:pointer;min-height:36px;transition:all .13s;white-space:nowrap}
.btn:hover:not(:disabled){border-color:color-mix(in srgb,var(--accent) 45%,var(--line));background:var(--panel2);color:var(--ink)}
.btn:active:not(:disabled){transform:translateY(1px)}
.btn.primary{
  background:var(--grad-blue);border-color:transparent;color:#fff;font-weight:750;
  box-shadow:0 6px 18px rgba(47,124,246,.35),inset 0 1px 0 rgba(255,255,255,.3);
}
html[data-theme="light"] .btn.primary{box-shadow:0 6px 16px rgba(37,99,235,.28),inset 0 1px 0 rgba(255,255,255,.3)}
.btn.primary:hover:not(:disabled){filter:brightness(1.08);box-shadow:0 8px 24px rgba(47,124,246,.5),inset 0 1px 0 rgba(255,255,255,.35);transform:translateY(-1px)}
.btn:disabled{opacity:.42;cursor:not-allowed}
select.small{min-height:34px;font-size:12px;font-weight:650;color:var(--muted);background:var(--bg);border:1px solid var(--line);border-radius:7px;padding:5px 24px 5px 9px;appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 13px) 55%,calc(100% - 8px) 55%;background-size:4.5px 4.5px;background-repeat:no-repeat}
.mini{font-size:11.5px;font-weight:650;color:var(--muted)}

/* previews */
.preview{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:260px;padding:14px;background:
  linear-gradient(45deg,var(--panel2) 25%,transparent 25%,transparent 75%,var(--panel2) 75%),
  linear-gradient(45deg,var(--panel2) 25%,var(--panel) 25%,var(--panel) 75%,var(--panel2) 75%);
  background-size:16px 16px;background-position:0 0,8px 8px;
  border:1px dashed var(--line2);border-radius:9px;overflow:auto}
.preview svg{display:block;max-width:100%;height:auto}
.empty{color:var(--faint);font-size:13px;display:flex;align-items:center;justify-content:center;min-height:inherit;padding:16px}
.meta-line{font-size:11.5px;color:var(--muted);display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.payload-box{font-family:var(--mono);font-size:11.5px;background:var(--bg);border:1px solid var(--line);border-radius:7px;padding:8px 10px;max-width:100%;word-break:break-all;color:var(--ink);user-select:all}
.actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center}

/* batch / label sheets */
.sheet-wrap{overflow:auto;background:var(--bg);border:1px solid var(--line);border-radius:9px;max-height:560px}
.sheet-holder{position:relative;margin:12px auto}
.sheet-empty{margin:34px auto;max-width:360px;text-align:center;color:var(--muted);background:var(--panel2);border:1px dashed var(--line2);border-radius:10px;padding:24px 20px;font-size:14px;line-height:1.7}
.sheet-pg{position:absolute;top:1.6mm;right:2.2mm;font-size:8px;color:#999;z-index:2}
.sheet{position:absolute;top:0;left:0;background:#fff;transform-origin:0 0;box-shadow:0 3px 14px rgba(0,0,0,.45)}
.sheet .qrcell{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2mm}
.sheet .qrcell svg{display:block}
.sheet .qrcell span{font-size:2.6mm;color:#111;margin-top:1.4mm;word-break:break-all;text-align:center;max-width:100%}
.sheet.cards .cardbox{position:absolute;width:85mm;height:54mm}
.label{position:absolute;background:#fff;display:flex;flex-direction:column;justify-content:center;padding:2.5mm;overflow:hidden;border:.12mm solid #ddd}
.ltitle{font-weight:800;font-size:4.2mm;line-height:1.25;color:#111}
.lsub{font-size:2.9mm;color:#555;margin-top:.8mm}
.lline{font-size:3mm;color:#222;margin-top:1.6mm;word-break:break-all}
.lcode{margin-top:auto;padding-top:1.6mm}
.lcode svg{display:block;max-width:100%}
.batch{display:flex;flex-direction:column;gap:0}

/* scanner */
.dropzone{border:2px dashed var(--line2);border-radius:10px;padding:24px 16px;text-align:center;color:var(--muted);font-size:13.5px;cursor:pointer;transition:all .15s;background:var(--bg)}
.dropzone:hover{border-color:var(--accent);color:var(--ink);box-shadow:0 0 18px var(--accent-soft)}
.dropzone.over{border-color:var(--accent);background:var(--accent-soft)}
.scan-video-wrap{margin-top:10px;border-radius:9px;overflow:hidden;position:relative;background:#000;min-height:0}
.scan-video-wrap video{display:block;width:100%;max-height:280px}
.cam-err{position:absolute;inset:0;display:grid;place-items:center;color:#d4d4d4;font-size:12.5px;padding:14px;text-align:center}
.scan-item{display:flex;gap:10px;align-items:flex-start;background:var(--panel);border:1px solid var(--line);border-radius:9px;padding:10px 12px;margin-top:8px;max-width:100%}
.scan-item img{width:52px;height:52px;object-fit:cover;border-radius:6px;flex:none;border:1px solid var(--line)}
.scan-item .txt{font-family:var(--mono);font-size:12px;word-break:break-all;user-select:all;color:var(--ink)}
.scan-item .btn{margin-top:6px}

/* lib warn */
.lib-warn{display:none;background:var(--accent-soft);color:var(--ink);border:1px solid color-mix(in srgb,var(--accent) 35%,var(--line));border-radius:9px;padding:10px 13px;font-size:12.5px;margin-bottom:12px}

/* ============================================================
   右侧悬浮工具条（联系我们 / 回到顶部）
   ============================================================ */
.dock{position:fixed;right:18px;bottom:24px;z-index:80;display:flex;flex-direction:column;gap:9px;
  opacity:0;transform:translateY(10px);pointer-events:none;transition:opacity .25s,transform .25s}
.dock.show{opacity:1;transform:none;pointer-events:auto}
.dock-btn{
  position:relative;width:42px;height:42px;border-radius:12px;border:1px solid var(--line2);
  background:color-mix(in srgb,var(--panel) 90%,transparent);backdrop-filter:blur(8px);
  color:var(--muted);display:grid;place-items:center;cursor:pointer;text-decoration:none;
  box-shadow:var(--sh);transition:all .15s;
}
.dock-btn:hover{color:#fff;background:var(--grad-blue);border-color:transparent;transform:translateY(-2px);
  box-shadow:0 8px 20px rgba(47,124,246,.45),inset 0 1px 0 rgba(255,255,255,.3)}
html[data-theme="light"] .dock-btn:hover{color:#fff}
.dock-btn:active{transform:translateY(0) scale(.96)}
.dock-tip{
  position:absolute;right:calc(100% + 10px);top:50%;transform:translate(4px,-50%);
  background:var(--ink);color:var(--bg);font-size:11.5px;font-weight:650;white-space:nowrap;
  padding:5px 10px;border-radius:7px;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;
}
.dock-tip::after{content:"";position:absolute;left:100%;top:50%;transform:translateY(-50%);
  border:5px solid transparent;border-left-color:var(--ink)}
.dock-btn:hover .dock-tip{opacity:1;transform:translate(0,-50%)}

/* toast */
.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,16px);background:var(--ink);color:var(--bg);font-size:12.5px;font-weight:600;padding:9px 17px;border-radius:99px;opacity:0;pointer-events:none;transition:all .22s;z-index:100;box-shadow:var(--sh-lg);max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* print */
#printRoot{display:none}

/* ---------- search results ---------- */
.sr-list{display:flex;flex-direction:column;gap:8px;margin-top:14px}
.sr-item{display:flex;gap:12px;align-items:flex-start;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:13px 15px;text-decoration:none;box-shadow:var(--sh);transition:all .14s}
.sr-item:hover{border-color:color-mix(in srgb,var(--accent) 45%,var(--line));transform:translateY(-1px)}
.sr-item .ic{flex:none;width:36px;height:36px;border-radius:9px;background:var(--accent-soft);color:var(--accent2);display:grid;place-items:center}
.sr-item b{display:block;font-size:14px;font-weight:700;margin-bottom:2px}
.sr-item span{font-size:12px;color:var(--muted);line-height:1.5;display:block}
.sr-item .tag{font-family:var(--mono);font-size:10px;font-weight:700;color:var(--accent2);letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1240px){
  .topbar .nav .nav-item,.topbar .nav .nav-link{padding:7px 9px;font-size:12px}
  .topbar .sb-search{width:130px}
}
@media (max-width:1080px){
  .topbar .nav{display:none}
  .menu-btn{display:grid}
  .topbar .sb-search{width:110px}
  .tool-grid-cards{grid-template-columns:repeat(2,1fr)}
  .tool-grid{grid-template-columns:1fr}
  .content{padding:0 18px 44px}
  .hero{margin:0 -18px;padding:44px 18px 30px}
  footer{padding:12px 16px}
}
@media (max-width:860px){
  .topbar .sb-search{display:none}
  .hero h1{font-size:clamp(27px,7vw,38px)}
  .hero p{font-size:14px}
  .hero{padding:36px 14px 26px}
  .hero-qr{opacity:.1}
  .stats{gap:6px 18px;padding:10px 16px}
  .steps{grid-template-columns:1fr}
  .step{flex-direction:row;align-items:baseline;gap:10px}
  .step::after{display:none}
  .step-d{order:3}
  .tool-grid-cards{grid-template-columns:1fr}
  .frow{flex-wrap:wrap}
  .actions .btn{flex:1 1 auto;justify-content:center}
  .preview{min-height:210px}
  .content{padding:0 12px 40px}
  .article,.faq-sec{max-width:none}
  .article h2{font-size:16.5px}
  .faq-item summary{font-size:13.5px;padding:11px 12px}
  .langbar a{padding:5px 8px;min-height:32px}
  .hero-cta .cta{width:100%;justify-content:center}
}
@media (max-width:420px){
  .frow .f{flex:1 1 100%}
  .stats{flex-direction:column;align-items:center;gap:5px}
  .bs{display:none}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}
@media print{
  .topbar,footer,.article,.faq-sec,.stats,.sec-head,.hero,.toast,.scrim,.trust,.steps,.sidebar,.types-sec,.dock{display:none!important}
  main{margin-left:0}
  .content{padding:0;max-width:none}
  .tool-head{display:none}
  .card-panel,.actions,.lib-warn{display:none!important}
  .tool-grid{grid-template-columns:1fr}
  .preview,.sheet-wrap{border:0;background:none;min-height:0;max-height:none;overflow:visible}
  .preview svg{max-width:100%}
  #printRoot{display:block!important}
  #printRoot .sheet{position:relative;box-shadow:none;transform:none!important}
  body{background:#fff}
}