/* ===========================================================
   FrontLab 前端技术开发平台  ——  样式表
   暗色 / 亮色双主题，改动 :root 变量即可全站换肤
   =========================================================== */

/* ---------- 主题变量 ---------- */
:root{
  --brand:#38bdf8;
  --brand2:#6366f1;
  --grad:linear-gradient(135deg,#38bdf8 0%,#6366f1 100%);
  --radius:14px;
  --radius-lg:18px;
  --maxw:1200px;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

/* 暗色（默认） */
[data-theme="dark"]{
  --bg:#080b14;
  --bg-alt:#0d1220;
  --surface:#111827;
  --surface-2:#151d2e;
  --line:#1e293b;
  --line-soft:#1a2234;
  --text:#e2e8f0;
  --text-dim:#94a3b8;
  --text-mute:#64748b;
  --head:#ffffff;
  --shadow:0 10px 30px rgba(0,0,0,.45);
  --shadow-lg:0 24px 60px rgba(0,0,0,.55);
  --glass:rgba(17,24,39,.72);
}
/* 亮色 */
[data-theme="light"]{
  --bg:#ffffff;
  --bg-alt:#f6f8fc;
  --surface:#ffffff;
  --surface-2:#f8fafc;
  --line:#e5e7eb;
  --line-soft:#eef2f7;
  --text:#1f2937;
  --text-dim:#4b5563;
  --text-mute:#6b7280;
  --head:#0f172a;
  --shadow:0 8px 24px rgba(15,23,42,.08);
  --shadow-lg:0 22px 50px rgba(15,23,42,.14);
  --glass:rgba(255,255,255,.8);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:74px}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.72;
  -webkit-font-smoothing:antialiased;transition:background .3s,color .3s;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
code,pre{font-family:var(--mono)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 26px;border-radius:999px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.25s ease;white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 22px rgba(99,102,241,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(99,102,241,.44)}
.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-sm{padding:8px 18px;font-size:14px}
.btn-block{width:100%;margin-top:22px}

/* ---------- 导航 ---------- */
.navbar{
  position:fixed;top:0;left:0;right:0;z-index:999;
  background:var(--glass);backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:.3s;
}
.navbar.scrolled{border-bottom-color:var(--line);box-shadow:0 4px 20px rgba(0,0,0,.25)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.logo{display:flex;align-items:center;gap:10px}
.logo-mark{width:34px;height:34px;flex:none}
.logo-text{font-size:17px;font-weight:700;color:var(--head);line-height:1.15;display:flex;flex-direction:column}
.logo-sub{font-size:9.5px;letter-spacing:2.4px;color:var(--text-mute);font-weight:600}
.nav-menu{display:flex;align-items:center;gap:26px}
.nav-link{font-size:14.5px;color:var(--text-dim);position:relative;transition:.2s;padding:6px 0}
.nav-link:hover,.nav-link.active{color:var(--brand)}
.nav-link.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--grad);border-radius:2px;
}
.nav-actions{display:flex;align-items:center;gap:12px;margin-left:8px}
.theme-btn{
  width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:var(--surface);
  color:var(--text);cursor:pointer;font-size:15px;display:flex;align-items:center;justify-content:center;transition:.25s;
}
.theme-btn:hover{border-color:var(--brand);color:var(--brand)}
[data-theme="dark"] .ic-sun{display:none}
[data-theme="light"] .ic-moon{display:none}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:.3s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 首屏 ---------- */
.hero{position:relative;padding:140px 0 90px;overflow:hidden}
.hero-glow{
  position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(680px 380px at 12% 8%,rgba(56,189,248,.22),transparent 62%),
    radial-gradient(620px 420px at 88% 22%,rgba(99,102,241,.24),transparent 62%);
}
.hero-grid{
  position:absolute;inset:0;z-index:0;
  background-image:linear-gradient(var(--line-soft) 1px,transparent 1px),
                   linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
  background-size:52px 52px;
  mask-image:radial-gradient(ellipse at 50% 26%,#000 25%,transparent 72%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 26%,#000 25%,transparent 72%);
}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.02fr .98fr;gap:52px;align-items:center}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:22px}
.tag{
  font-size:12.5px;padding:5px 13px;border-radius:999px;border:1px solid var(--line);
  color:var(--text-dim);background:var(--surface);
}
.tag-blue{color:var(--brand);border-color:rgba(56,189,248,.4);background:rgba(56,189,248,.1)}
.hero h1{font-size:50px;line-height:1.2;color:var(--head);letter-spacing:-.6px}
.hero-desc{font-size:16.5px;color:var(--text-dim);max-width:560px;margin-top:18px}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}

/* 安装条 */
.install-box{margin-top:36px;max-width:520px}
.install-tabs{display:flex;gap:6px;margin-bottom:10px}
.itab{
  padding:6px 16px;border-radius:8px;border:1px solid var(--line);background:transparent;
  color:var(--text-mute);font-size:13px;cursor:pointer;transition:.2s;
}
.itab:hover{color:var(--text)}
.itab.active{background:var(--surface);color:var(--brand);border-color:rgba(56,189,248,.45)}
.install-cmd{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;
}
.install-cmd code{font-size:14px;color:var(--text);word-break:break-all}
.copy-btn{
  flex:none;padding:6px 14px;border-radius:8px;border:1px solid var(--line);background:var(--surface-2);
  color:var(--text-dim);font-size:12.5px;cursor:pointer;transition:.2s;
}
.copy-btn:hover{color:var(--brand);border-color:var(--brand)}
.copy-btn.done{color:#10b981;border-color:#10b981}

/* 终端卡 */
.hero-visual{position:relative}
.term{
  background:#0b1120;border:1px solid #1e293b;border-radius:var(--radius-lg);overflow:hidden;
  box-shadow:var(--shadow-lg);
}
[data-theme="light"] .term{background:#0f172a;border-color:#1e293b}
.term-bar{display:flex;align-items:center;gap:7px;padding:11px 15px;background:#111a2e;border-bottom:1px solid #1e293b}
.term-bar i{width:10px;height:10px;border-radius:50%;background:#ef4444}
.term-bar i:nth-child(2){background:#f59e0b}
.term-bar i:nth-child(3){background:#10b981}
.term-bar span{margin-left:10px;font-size:12px;color:#64748b;font-family:var(--mono)}
.term-status{margin-left:auto;font-size:10.5px;letter-spacing:1px;color:#34d399;font-style:normal}
.term-body{padding:18px 20px;overflow-x:auto}
.term-body pre{font-size:12.8px;line-height:1.9;color:#cbd5e1;white-space:pre}
.c-dim{color:#64748b}.c-ok{color:#34d399}.c-warn{color:#fbbf24}.c-num{color:#fbbf24}
.c-link{color:#38bdf8;text-decoration:underline}.c-cmd{color:#f8fafc}.c-key{color:#c084fc}
.c-str{color:#34d399}.c-attr{color:#60a5fa}.c-fn{color:#fbbf24}.c-tag{color:#f472b6}
.float-chip{
  position:absolute;background:var(--surface);border:1px solid var(--line);border-radius:12px;
  padding:10px 16px;font-size:13px;color:var(--text-dim);box-shadow:var(--shadow);
}
.float-chip b{color:var(--brand);font-size:15px}
.fc-a{top:-20px;right:6px;animation:float 7s ease-in-out infinite}
.fc-b{bottom:-16px;left:-8px;animation:float 9s ease-in-out infinite reverse}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(14px,16px)}}

/* ---------- 区块通用 ---------- */
.section{padding:92px 0}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;max-width:660px;margin:0 auto 54px}
.section-tag{font-size:11.5px;letter-spacing:3px;font-weight:700;color:var(--brand)}
.section-head h2{font-size:34px;color:var(--head);margin:12px 0 12px;letter-spacing:-.4px}
.section-head p{color:var(--text-dim);font-size:15.5px}
.grid{display:grid;gap:22px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}

/* 能力卡 */
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:28px 24px;transition:.3s;position:relative;
}
.card:hover{transform:translateY(-6px);border-color:rgba(56,189,248,.45);box-shadow:var(--shadow)}
.card-icon{
  width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  margin-bottom:18px;color:#fff;
}
.card-icon svg{width:22px;height:22px}
.c-blue{background:linear-gradient(135deg,#38bdf8,#0ea5e9)}
.c-purple{background:linear-gradient(135deg,#a78bfa,#6366f1)}
.c-green{background:linear-gradient(135deg,#34d399,#059669)}
.c-orange{background:linear-gradient(135deg,#fbbf24,#f97316)}
.c-red{background:linear-gradient(135deg,#fb7185,#e11d48)}
.c-cyan{background:linear-gradient(135deg,#22d3ee,#0891b2)}
.card h3{font-size:18px;color:var(--head);margin-bottom:9px}
.card p{font-size:14.5px;color:var(--text-dim)}
.mini-list{margin-top:16px;display:flex;flex-direction:column;gap:7px}
.mini-list li{
  font-size:12.8px;font-family:var(--mono);color:var(--text-mute);
  padding-left:14px;position:relative;
}
.mini-list li::before{content:"›";position:absolute;left:0;color:var(--brand)}

/* ---------- 工作流 ---------- */
.pipeline{
  display:grid;grid-template-columns:repeat(6,1fr);gap:0;position:relative;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px 20px;
}
.pipe-step{position:relative;padding:0 16px;text-align:center}
.pipe-step+.pipe-step::before{
  content:"";position:absolute;left:-6px;top:22px;width:12px;height:2px;background:var(--line);
}
.pipe-dot{
  width:44px;height:44px;margin:0 auto 14px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:800;color:#fff;background:var(--grad);
  box-shadow:0 6px 16px rgba(99,102,241,.3);
}
.pipe-step h4{font-size:15.5px;color:var(--head);margin-bottom:7px}
.pipe-step p{font-size:13px;color:var(--text-mute);line-height:1.6}

/* ---------- 快速开始 ---------- */
.qs-wrap{display:grid;grid-template-columns:.72fr 1.28fr;gap:22px}
.qs-tree,.qs-code{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.tree-title{
  padding:13px 18px;font-size:12.5px;letter-spacing:1.4px;color:var(--text-mute);
  border-bottom:1px solid var(--line);background:var(--surface-2);
}
.tree{padding:16px 12px;font-family:var(--mono);font-size:13px}
.tree li{padding:5px 8px;border-radius:6px;color:var(--text-dim);transition:.2s}
.tree li:hover{background:var(--surface-2);color:var(--text)}
.tree .dir{color:var(--brand);font-weight:600}
.tree .file span{margin-left:10px;color:var(--text-mute);font-size:11.5px;font-family:inherit}
.deep-1{padding-left:26px!important}
.deep-2{padding-left:44px!important}
.code-tabs{display:flex;gap:4px;padding:10px 12px;border-bottom:1px solid var(--line);background:var(--surface-2);overflow-x:auto}
.ctab{
  padding:7px 15px;border-radius:8px;border:0;background:transparent;color:var(--text-mute);
  font-size:13px;font-family:var(--mono);cursor:pointer;transition:.2s;white-space:nowrap;
}
.ctab:hover{color:var(--text)}
.ctab.active{background:var(--surface);color:var(--brand)}
.pane{display:none;padding:20px;overflow-x:auto;position:relative}
.pane.active{display:block}
.pane pre{font-size:13px;line-height:1.95;color:var(--text);white-space:pre}
.pane .c-str{color:#34d399}
.copy-corner{margin:0 20px 20px}

/* ---------- 组件预览 ---------- */
.ui-wrap{display:grid;grid-template-columns:230px 1fr;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.ui-side{padding:16px 12px;border-right:1px solid var(--line);background:var(--surface-2)}
.ui-tab{
  display:block;width:100%;text-align:left;padding:10px 14px;border:0;border-radius:9px;
  background:transparent;color:var(--text-dim);font-size:14px;cursor:pointer;transition:.2s;margin-bottom:4px;
}
.ui-tab:hover{background:var(--surface);color:var(--text)}
.ui-tab.active{background:var(--grad);color:#fff;font-weight:600}
.ui-side-note{margin-top:22px;padding-top:16px;border-top:1px dashed var(--line)}
.ui-side-note b{display:block;font-size:12.5px;color:var(--head);margin-bottom:8px}
.ui-side-note code{display:block;font-size:11.5px;color:var(--text-mute);padding:2px 0}
.ui-stage{padding:28px;min-height:330px}
.ui-view{display:none}
.ui-view.active{display:block}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
/* 组件库示例元素 */
.ub{padding:9px 20px;border-radius:9px;font-size:14px;font-weight:600;border:1px solid var(--line);background:var(--surface-2);color:var(--text);cursor:pointer;transition:.2s}
.ub:hover{transform:translateY(-1px)}
.ub-primary{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 6px 16px rgba(99,102,241,.3)}
.ub-default{background:var(--surface-2)}
.ub-dashed{border-style:dashed;color:var(--brand);border-color:var(--brand)}
.ub-text{border-color:transparent;background:transparent;color:var(--brand)}
.ub-danger{background:linear-gradient(135deg,#fb7185,#e11d48);color:#fff;border-color:transparent}
.ub:disabled{opacity:.5;cursor:not-allowed}
.ub-loading{color:var(--brand);border-color:var(--brand)}
.spin{display:inline-block;width:12px;height:12px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;margin-right:7px;vertical-align:-1px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:18px}
.fl{display:flex;flex-direction:column;gap:7px;font-size:13.5px;color:var(--text-dim)}
.fl-full{grid-column:1/-1}
.fi{
  padding:10px 13px;border-radius:9px;border:1px solid var(--line);background:var(--bg);
  color:var(--text);font-size:14px;font-family:inherit;outline:none;transition:.2s;
}
.fi:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(56,189,248,.14)}
.ut{width:100%;border-collapse:collapse;font-size:14px}
.ut th{text-align:left;padding:12px 14px;font-size:12.5px;color:var(--text-mute);font-weight:600;border-bottom:1px solid var(--line)}
.ut td{padding:12px 14px;border-bottom:1px solid var(--line-soft);color:var(--text-dim)}
.ut tr:hover td{background:var(--surface-2)}
.pill{padding:3px 11px;border-radius:999px;font-size:12px;border:1px solid var(--line);color:var(--text-mute)}
.pill-ok{color:#10b981;border-color:rgba(16,185,129,.4);background:rgba(16,185,129,.1)}
.pill-warn{color:#f59e0b;border-color:rgba(245,158,11,.4);background:rgba(245,158,11,.1)}
.pill-err{color:#ef4444;border-color:rgba(239,68,68,.4);background:rgba(239,68,68,.1)}
.chart-box{border:1px solid var(--line);border-radius:12px;padding:20px;background:var(--surface-2)}
.chart-title{font-size:13.5px;color:var(--head);margin-bottom:18px}
.bars{display:flex;align-items:flex-end;gap:14px;height:170px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.bars span{flex:1;border-radius:6px 6px 0 0;height:var(--h);background:var(--grad);opacity:.85;transition:.4s}
.bars span:hover{opacity:1}
.chart-legend{display:flex;gap:18px;margin-top:12px;font-size:12px;color:var(--text-mute)}
.alert{padding:13px 16px;border-radius:10px;font-size:13.8px;margin-bottom:12px;border:1px solid;color:var(--text-dim)}
.alert b{display:inline-block;margin-right:8px;color:var(--head)}
.alert-ok{border-color:rgba(16,185,129,.35);background:rgba(16,185,129,.08)}
.alert-warn{border-color:rgba(245,158,11,.35);background:rgba(245,158,11,.08)}
.alert-err{border-color:rgba(239,68,68,.35);background:rgba(239,68,68,.08)}

/* ---------- 基准表 ---------- */
.table-wrap{overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:8px}
.bt{width:100%;border-collapse:collapse;font-size:14.5px;min-width:640px}
.bt th,.bt td{padding:15px 18px;text-align:left;border-bottom:1px solid var(--line-soft)}
.bt thead th{font-size:12.5px;color:var(--text-mute);font-weight:600;letter-spacing:.4px}
.bt td{color:var(--text-dim)}
.bt .hl{color:var(--brand);font-weight:700}
.bt thead .hl{background:rgba(56,189,248,.08)}
.bt tbody tr:hover td{background:var(--surface-2)}
.bt .up{color:#10b981;font-weight:600}
.table-note{text-align:center;margin-top:16px;font-size:13px;color:var(--text-mute)}
.table-note code{color:var(--brand)}

/* ---------- 生态 ---------- */
.eco-wall{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.eco{
  padding:11px 24px;border-radius:11px;border:1px solid var(--line);background:var(--surface);
  font-size:14px;color:var(--text-dim);font-weight:600;transition:.25s;
}
.eco:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-3px);box-shadow:var(--shadow)}

/* ---------- 文档 ---------- */
.doc{
  display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 22px;transition:.3s;
}
.doc:hover{transform:translateY(-5px);border-color:rgba(56,189,248,.45);box-shadow:var(--shadow)}
.doc h3{font-size:16px;color:var(--head);margin-bottom:8px}
.doc p{font-size:13.5px;color:var(--text-mute);min-height:42px}
.doc-go{font-size:13px;color:var(--brand);font-weight:600}

/* ---------- 更新日志 ---------- */
.timeline{max-width:820px;margin:0 auto;position:relative;padding-left:34px}
.timeline::before{content:"";position:absolute;left:9px;top:8px;bottom:8px;width:2px;background:var(--line)}
.tl-item{position:relative;padding-bottom:34px}
.tl-item::before{
  content:"";position:absolute;left:-31px;top:6px;width:12px;height:12px;border-radius:50%;
  background:var(--grad);box-shadow:0 0 0 4px var(--bg-alt);
}
.tl-ver{font-size:16px;font-weight:700;color:var(--head);font-family:var(--mono)}
.tl-date{font-size:12.5px;color:var(--text-mute);margin:2px 0 12px}
.tl-item ul{display:flex;flex-direction:column;gap:9px}
.tl-item li{font-size:14px;color:var(--text-dim);display:flex;gap:10px;align-items:flex-start}
.tl-tag{flex:none;font-size:11px;padding:2px 9px;border-radius:6px;font-weight:600;margin-top:3px}
.tl-new{color:#10b981;background:rgba(16,185,129,.12)}
.tl-opt{color:var(--brand);background:rgba(56,189,248,.12)}
.tl-fix{color:#f59e0b;background:rgba(245,158,11,.12)}
.tl-break{color:#ef4444;background:rgba(239,68,68,.12)}

/* ---------- 价格 ---------- */
.price{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px 26px;position:relative;transition:.3s;
}
.price:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.price-hot{border-color:rgba(56,189,248,.55);box-shadow:0 0 0 1px rgba(56,189,248,.2),var(--shadow)}
.price-badge{
  position:absolute;top:-12px;right:22px;padding:4px 14px;border-radius:999px;
  background:var(--grad);color:#fff;font-size:12px;font-weight:700;
}
.price h3{font-size:18px;color:var(--head)}
.price-num{font-size:32px;font-weight:800;color:var(--head);margin:12px 0 6px}
.price-num small{font-size:13px;font-weight:500;color:var(--text-mute)}
.price-desc{font-size:13.5px;color:var(--text-mute);min-height:26px}
.price-list{margin-top:18px;display:flex;flex-direction:column;gap:10px}
.price-list li{font-size:14px;color:var(--text-dim);padding-left:22px;position:relative}
.price-list li::before{content:"✓";position:absolute;left:0;color:#10b981;font-weight:700}
.price-list li.off{color:var(--text-mute);opacity:.6}
.price-list li.off::before{content:"—";color:var(--text-mute)}

/* ---------- CTA ---------- */
.cta-section{background:linear-gradient(180deg,var(--bg) 0%,var(--bg-alt) 100%)}
.cta{text-align:center;max-width:720px;margin:0 auto}
.cta h2{font-size:32px;color:var(--head);margin-bottom:12px}
.cta>p{color:var(--text-dim);font-size:15.5px}
.cta-form{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap;justify-content:center}
.cta-form input{
  flex:1;min-width:200px;max-width:250px;padding:12px 16px;border-radius:11px;
  border:1px solid var(--line);background:var(--surface);color:var(--text);font-size:14.5px;
  font-family:inherit;outline:none;transition:.2s;
}
.cta-form input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(56,189,248,.14)}
.form-tip{font-size:13.5px;margin-top:14px;min-height:20px}
.form-tip.ok{color:#10b981}
.form-tip.err{color:#ef4444}
.cta-meta{display:flex;gap:26px;justify-content:center;flex-wrap:wrap;margin-top:28px;font-size:13px;color:var(--text-mute)}

/* ---------- 页脚 ---------- */
.footer{background:var(--bg-alt);border-top:1px solid var(--line);padding:60px 0 22px}
.footer-inner{display:grid;grid-template-columns:1.5fr 2fr;gap:48px;padding-bottom:36px;border-bottom:1px solid var(--line)}
.footer-brand p{margin-top:16px;font-size:14px;color:var(--text-mute);max-width:320px}
.footer-status{display:inline-flex;align-items:center;gap:8px;margin-top:16px;font-size:13px;color:var(--text-dim)}
.dot-ok{width:8px;height:8px;border-radius:50%;background:#10b981;box-shadow:0 0 0 4px rgba(16,185,129,.16)}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.footer-links h4{color:var(--head);font-size:14.5px;margin-bottom:14px}
.footer-links a{display:block;font-size:13.5px;color:var(--text-mute);padding:5px 0;transition:.2s}
.footer-links a:hover{color:var(--brand);transform:translateX(3px)}
.footer-bottom{display:flex;justify-content:space-between;gap:14px;padding-top:20px;font-size:12.5px;color:var(--text-mute);flex-wrap:wrap}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:24px;bottom:24px;width:42px;height:42px;border-radius:50%;border:0;
  background:var(--grad);color:#fff;font-size:17px;cursor:pointer;
  box-shadow:0 8px 22px rgba(99,102,241,.35);opacity:0;visibility:hidden;transition:.3s;z-index:998;
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{transform:translateY(-3px)}

/* ---------- 动画 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:46px}
  .hero{padding:120px 0 70px}
  .hero h1{font-size:38px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .pipeline{grid-template-columns:repeat(3,1fr);gap:26px 0}
  .pipe-step+.pipe-step::before{display:none}
  .qs-wrap{grid-template-columns:1fr}
  .ui-wrap{grid-template-columns:1fr}
  .ui-side{display:flex;gap:8px;overflow-x:auto;border-right:0;border-bottom:1px solid var(--line)}
  .ui-tab{width:auto;white-space:nowrap;margin-bottom:0}
  .ui-side-note{display:none}
  .footer-inner{grid-template-columns:1fr;gap:32px}
}
@media (max-width:768px){
  .nav-toggle{display:flex}
  .nav-menu{
    position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--glass);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;opacity:0;transition:.3s;padding:0 24px;
  }
  .nav-menu.open{max-height:460px;opacity:1;padding:10px 24px 22px}
  .nav-menu .nav-link{padding:12px 0;border-bottom:1px solid var(--line)}
  .nav-menu .nav-link.active::after{display:none}
  .nav-actions{margin:14px 0 0;justify-content:space-between}
  .hero h1{font-size:29px}
  .section{padding:60px 0}
  .section-head h2{font-size:25px}
  .grid-4,.grid-3{grid-template-columns:1fr}
  .pipeline{grid-template-columns:repeat(2,1fr);padding:24px 10px}
  .form-grid{grid-template-columns:1fr}
  .float-chip{display:none}
  .cta h2{font-size:25px}
  .footer-links{grid-template-columns:repeat(2,1fr)}
  .cta-form input{max-width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}