/* 智航未来 ZHIHANG FUTURE — 设计系统（浅色默认 / 深色随系统与手动切换） */

/* ---------- 主题令牌 ---------- */
:root{
  color-scheme:light;
  --bg:#ffffff;
  --bg2:#f3f6fb;
  --panel:#ffffff;
  --panel-hi:#f8fafc;
  --line:rgba(15,23,42,.14);
  --ink:#0f172a;
  --muted:#5b6b80;
  --accent:#0e7490;
  --accent2:#6d28d9;
  --grad:linear-gradient(120deg,#0891b2,#7c3aed);
  --on-grad:#ffffff;
  --danger:#b91c1c;
  --accent-soft:color-mix(in srgb,var(--accent) 9%,transparent);
  --accent-line:color-mix(in srgb,var(--accent) 32%,transparent);
  --card-shadow:0 18px 44px rgba(15,23,42,.1);
  --header-bg:rgba(255,255,255,.85);
  --input-bg:#ffffff;
  --chip-bg:color-mix(in srgb,var(--accent) 7%,transparent);
  --chip-border:color-mix(in srgb,var(--accent) 30%,transparent);
  --chip-text:var(--accent);
  --glow1:rgba(34,211,238,.2);
  --glow2:rgba(139,92,246,.16);
  --grid-line:rgba(15,23,42,.05);
  --footer-bg:#0b1120;
  --footer-ink:#e2e8f0;
  --footer-muted:#94a3b8;
  --footer-line:rgba(148,163,184,.14);
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#05070f;
  --bg2:#0a101f;
  --panel:rgba(255,255,255,.035);
  --panel-hi:rgba(255,255,255,.06);
  --line:rgba(148,163,184,.18);
  --ink:#e8edf7;
  --muted:#94a3b8;
  --accent:#22d3ee;
  --accent2:#8b5cf6;
  --grad:linear-gradient(120deg,#22d3ee,#8b5cf6);
  --on-grad:#04121a;
  --danger:#f87171;
  --accent-soft:color-mix(in srgb,var(--accent) 9%,transparent);
  --accent-line:color-mix(in srgb,var(--accent) 30%,transparent);
  --card-shadow:0 24px 70px rgba(2,6,23,.55);
  --header-bg:rgba(5,7,15,.72);
  --input-bg:rgba(5,7,15,.6);
  --chip-bg:color-mix(in srgb,var(--accent) 7%,transparent);
  --chip-border:color-mix(in srgb,var(--accent) 28%,transparent);
  --chip-text:#cbe9f5;
  --glow1:rgba(34,211,238,.16);
  --glow2:rgba(139,92,246,.16);
  --grid-line:rgba(148,163,184,.06);
}

/* ---------- 基础 ---------- */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;transition:background .3s ease,color .3s ease}
a{color:inherit;text-decoration:none}
img{max-width:100%}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3{line-height:1.25}
.wrap{width:min(1180px,calc(100% - 40px));margin:0 auto;position:relative;z-index:1}

/* ---------- 头部 ---------- */
.site-header{position:fixed;inset:0 0 auto;z-index:50;border-bottom:1px solid var(--line);background:var(--header-bg);backdrop-filter:blur(16px);transition:background .3s ease,border-color .3s ease}
.nav{width:min(1180px,calc(100% - 40px));height:72px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:inline-flex;align-items:center;font-weight:800;font-size:18px;letter-spacing:1px;white-space:nowrap;color:var(--ink)}
.brand .logo-wrap{position:relative;display:inline-block;height:56px;width:156px;flex:0 0 auto;overflow:hidden}
.brand .logo-light,.brand .logo-dark{position:absolute;top:0;left:0;height:56px;width:156px;object-fit:contain}
.brand .logo-dark{display:none}
[data-theme="dark"] .brand .logo-light{display:none}
[data-theme="dark"] .brand .logo-dark{display:block}
.site-footer .brand .logo-light{display:none}
.site-footer .brand .logo-dark{display:block}
.brand em{font-style:normal;font-size:10px;letter-spacing:2.5px;color:var(--muted);display:block;line-height:1;margin-top:2px}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.theme-toggle{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:transparent;color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:16px;transition:border-color .2s ease,transform .3s ease}
.theme-toggle:hover{border-color:var(--accent);transform:rotate(20deg)}
.nav-links{display:flex;align-items:center;gap:26px;color:var(--muted);font-size:14px}
.nav-links a{transition:color .2s ease}
.nav-links a:hover,.nav-links a.active{color:var(--accent)}
.nav-has-sub{position:relative}
.nav-has-sub > a{cursor:pointer}
.nav-has-sub > a::after{content:"▾";margin-left:3px;font-size:11px;opacity:.7}
.nav-sub{position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%) translateY(-6px);min-width:200px;background:var(--bg);border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 36px color-mix(in srgb,var(--ink) 12%,transparent);padding:8px;opacity:0;visibility:hidden;transition:opacity .2s ease,transform .2s ease,visibility .2s ease;z-index:50;display:flex;flex-direction:column;gap:0}
.nav-has-sub:hover .nav-sub,.nav-has-sub.open .nav-sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.nav-sub a{display:block;padding:10px 14px;border-radius:8px;font-size:13.5px;color:var(--ink);white-space:nowrap}
.nav-sub a:hover{background:var(--accent-soft);color:var(--accent)}
.nav-sub .sub-desc{font-size:11px;color:var(--muted);display:block;margin-top:2px;font-weight:400}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:10px;border:1px solid transparent;font-weight:650;font-size:14px;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{color:var(--on-grad);background:var(--grad);box-shadow:0 12px 30px color-mix(in srgb,var(--accent) 24%,transparent)}
.btn-ghost{color:var(--ink);border-color:var(--line);background:var(--panel)}
.btn-ghost:hover{background:var(--panel-hi)}
.nav-cta{min-height:38px;padding:0 16px}
.menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--ink)}
.menu-toggle span{display:block;width:18px;height:2px;margin:4px auto;background:currentColor}

/* ---------- Hero ---------- */
.hero{position:relative;padding:150px 0 90px;overflow:hidden;background:linear-gradient(160deg,#0a1a2e 0%,#0f2847 55%,#113359 100%);color:#e6eef5}
[data-theme="light"] .hero{background:linear-gradient(160deg,#eaf3fa 0%,#d6e6f2 55%,#c5dbee 100%);color:#0b2340}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:56px 56px;mask-image:linear-gradient(to bottom,rgba(0,0,0,.35),transparent 85%);opacity:.5}
[data-theme="dark"] .hero::before{--grid-line:rgba(255,255,255,.08)}
[data-theme="light"] .hero::before{--grid-line:rgba(14,116,144,.12)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;pointer-events:none}
.hero-bg::before,.hero-bg::after{content:"";position:absolute;inset:0;pointer-events:none}
.hero-bg::before{background:
  radial-gradient(ellipse 600px 400px at 85% 20%,rgba(6,182,212,.25),transparent 60%),
  radial-gradient(ellipse 500px 500px at 15% 80%,rgba(14,116,144,.2),transparent 60%),
  radial-gradient(ellipse 300px 300px at 60% 60%,rgba(99,102,241,.15),transparent 60%)}
.hero-bg::after{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 800 600'%3E%3Cg fill='none' stroke='%2306b6d4' stroke-opacity='.15' stroke-width='1'%3E%3Ccircle cx='700' cy='100' r='120'/%3E%3Ccircle cx='700' cy='100' r='180' stroke-dasharray='4 6'/%3E%3Ccircle cx='100' cy='500' r='100'/%3E%3Ccircle cx='100' cy='500' r='160' stroke-dasharray='4 6'/%3E%3Cpath d='M0 400 Q200 300 400 400 T800 400'/%3E%3Cpath d='M0 420 Q200 320 400 420 T800 420' stroke-dasharray='6 4'/%3E%3Ccircle cx='400' cy='300' r='6' fill='%2306b6d4' fill-opacity='.5'/%3E%3Ccircle cx='700' cy='100' r='4' fill='%2306b6d4' fill-opacity='.6'/%3E%3Ccircle cx='100' cy='500' r='4' fill='%2306b6d4' fill-opacity='.6'/%3E%3C/g%3E%3C/svg%3E");background-size:600px 450px;background-position:center;opacity:.6}
[data-theme="light"] .hero-bg::before{background:
  radial-gradient(ellipse 600px 400px at 85% 20%,rgba(6,182,212,.18),transparent 60%),
  radial-gradient(ellipse 500px 500px at 15% 80%,rgba(14,116,144,.14),transparent 60%),
  radial-gradient(ellipse 300px 300px at 60% 60%,rgba(99,102,241,.1),transparent 60%)}
[data-theme="light"] .hero-bg::after{opacity:.35}
.glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.55;pointer-events:none}
.glow-a{width:480px;height:480px;background:var(--glow1);top:-140px;left:-120px}
.glow-b{width:520px;height:520px;background:var(--glow2);top:-60px;right:-140px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12.5px;font-weight:700;letter-spacing:2.5px;color:var(--accent);text-transform:uppercase}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--grad)}
h1{margin:22px 0 18px;font-size:clamp(30px,4.4vw,54px);font-weight:820;line-height:1.14}
h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{max-width:820px;color:var(--muted);font-size:17.5px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.chip-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.chip{display:inline-flex;align-items:center;gap:8px;min-height:36px;padding:6px 14px;border-radius:999px;font-size:13px;color:var(--chip-text);border:1px solid var(--chip-border);background:var(--chip-bg)}
.chip b{color:var(--accent);font-weight:700}

/* ---------- 板块 ---------- */
.section{padding:84px 0}
.section.alt{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:760px;margin:0 auto 44px;text-align:center}
.kicker{display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;color:var(--accent);font-size:13px;font-weight:750;letter-spacing:1.5px}
.kicker::before,.kicker::after{content:"";width:26px;height:2px;background:var(--grad)}
.section-head h2{font-size:clamp(26px,3.1vw,40px);font-weight:800;margin-bottom:14px}
.section-head p{color:var(--muted);font-size:15.5px}
.grid-3,.grid-2,.grid-4{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- 卡片 ---------- */
.card{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:26px;transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease}
.card:hover{transform:translateY(-4px);border-color:var(--accent-line);box-shadow:var(--card-shadow)}
.card h3{font-size:17px;margin-bottom:10px}
.card p{color:var(--muted);font-size:14px;margin-bottom:0}
.card .icon{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;background:var(--accent-soft);border:1px solid var(--accent-line);margin-bottom:16px}
.card .meta{margin-top:14px;font-size:13px;color:var(--accent);font-weight:650}
.clean-list{list-style:none;padding:0;margin:0;display:grid;gap:10px}
.clean-list li{position:relative;padding-left:20px;color:var(--muted);font-size:14px}
.clean-list li::before{content:"";position:absolute;left:0;top:.68em;width:7px;height:7px;border-radius:50%;background:var(--grad)}
.clean-list li strong{color:var(--ink)}

/* ---------- 承诺 / 数字 ---------- */
.promise .num{font-size:13px;font-weight:800;color:var(--accent);letter-spacing:1px;margin-bottom:10px;display:block}
.num-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.num-strip > div{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:18px 20px;border-left:3px solid var(--accent);transition:border-color .2s}
.num-strip > div:hover{border-left-color:var(--grad)}
.num-strip b{display:block;font-size:28px;color:var(--ink);font-weight:700;letter-spacing:.5px}
.num-strip span{color:var(--muted);font-size:13px;margin-top:4px;display:block}
.num-strip .kpi-today{border-left-color:#0ea5e9}
.num-strip .kpi-total{border-left-color:#7c3aed}
.num-strip .kpi-visitor{border-left-color:#f59e0b}
.num-strip .kpi-view{border-left-color:#10b981}

/* ---------- AI 智能体汇总页卡片 ---------- */
.agent-card{text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:12px;transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease}
.agent-card:hover{transform:translateY(-3px);border-color:var(--accent-line);box-shadow:var(--card-shadow)}
.agent-card-head{display:flex;align-items:center;gap:14px}
.agent-card-head .icon{flex:0 0 48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;background:var(--accent-soft);border:1px solid var(--accent-line)}
.agent-tag{font-size:11px;color:var(--muted);letter-spacing:1.5px;margin-top:2px}
.agent-feats{list-style:none;padding:0;margin:4px 0 0;display:flex;flex-direction:column;gap:5px}
.agent-feats li{font-size:13.5px;color:var(--muted);padding-left:14px;position:relative}
.agent-feats li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:700;font-size:11px}
.agent-meta{font-size:12px;color:var(--accent);font-weight:600;margin-top:auto;padding-top:6px;border-top:1px dashed var(--line)}

/* ---------- Hero 轮播 ---------- */
.hero-slider{position:relative;overflow:hidden}
.slides{position:relative;min-height:420px;display:flex;align-items:center}
.slide{position:absolute;inset:0;display:flex;flex-direction:column;gap:14px;opacity:0;transform:translateY(12px);transition:opacity .6s ease,transform .6s ease;pointer-events:none}
.slide.active{opacity:1;transform:translateY(0);pointer-events:auto;position:relative}
.slider-kpis{display:flex;gap:14px;margin:6px 0 4px;flex-wrap:wrap}
.slider-kpis span{display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:10px 16px;border:1px solid var(--accent-line);border-radius:10px;background:var(--panel);font-size:12px;color:var(--muted)}
.slider-kpis b{font-size:20px;font-weight:800;color:var(--ink)}
.slider-progress{display:flex;justify-content:center;gap:10px;margin-top:22px;align-items:center}
.slider-progress .track{position:relative;width:48px;height:4px;border-radius:3px;background:rgba(255,255,255,.18);cursor:pointer;overflow:hidden;transition:background .3s ease}
[data-theme="light"] .slider-progress .track{background:rgba(14,116,144,.18)}
.slider-progress .track .fill{position:absolute;inset:0;border-radius:3px;background:var(--brand);transform-origin:left;transform:scaleX(0);transition:transform .1s linear}
.slider-progress .track.active .fill{animation:fillSlide 5s linear forwards}
@keyframes fillSlide{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.slider-progress .track.paused .fill{animation-play-state:paused}
.slider-progress .num{position:absolute;top:-18px;right:-14px;font-size:10px;font-weight:700;color:rgba(255,255,255,.5);font-variant-numeric:tabular-nums}
[data-theme="light"] .slider-progress .num{color:rgba(14,116,144,.5)}

/* ---------- 案例墙 ---------- */
.case-wall{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.case-item{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:18px 20px;transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease}
.case-item:hover{transform:translateY(-3px);border-color:var(--accent-line);box-shadow:var(--card-shadow)}
.case-ico{flex:0 0 40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;background:var(--accent-soft);border:1px solid var(--accent-line)}
.case-body{flex:1;min-width:0}
.case-tag{display:inline-block;font-size:12px;color:var(--accent);font-weight:700;margin-bottom:6px;letter-spacing:.5px}
.case-item h3{font-size:14.5px;font-weight:600;line-height:1.5;color:var(--ink);margin:0}

/* ---------- 三步流程 ---------- */
.steps-3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- 后台统计页 ---------- */
.stats-section{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:18px 20px;margin-top:16px}
.stats-section > h3{font-size:14px;color:var(--ink);margin:0 0 12px;display:flex;align-items:center;gap:8px}
.stats-section > h3::before{content:"";width:4px;height:14px;background:var(--grad);border-radius:2px}
.stats-section .hint{margin-top:10px}
.stat-bar{display:grid;grid-template-columns:46px 1fr auto;gap:10px;align-items:center;padding:5px 0;font-size:13px;color:var(--muted)}
.stat-bar .bar-date{color:var(--muted);font-variant-numeric:tabular-nums;text-align:right}
.stat-bar .bar-wrap{height:10px;background:var(--panel-hi);border-radius:5px;overflow:hidden}
.stat-bar .bar-fill{display:block;height:100%;background:var(--grad);border-radius:5px}
.stat-bar .bar-text{font-size:12.5px;color:var(--muted);white-space:nowrap}
.stats-table{width:100%;border-collapse:collapse;font-size:13px}
.stats-table th{text-align:left;padding:9px 12px;border-bottom:2px solid var(--line);font-size:12px;color:var(--muted);font-weight:600;letter-spacing:.5px;text-transform:uppercase}
.stats-table td{padding:9px 12px;border-bottom:1px solid var(--line);color:var(--ink);vertical-align:top}
.stats-table tbody tr:last-child td{border-bottom:0}
.stats-table tbody tr:hover td{background:var(--panel-hi)}
.stats-table td.num{text-align:right;font-variant-numeric:tabular-nums}
.stats-table td.engine{white-space:nowrap}
.stats-table td.kw{color:var(--ink)}
.stats-table td.empty{text-align:center;padding:24px 12px;color:var(--muted);border-bottom:0}

/* ---------- 痛点 ---------- */
.pain-quote{border-left:3px solid var(--danger);padding:12px 18px;background:color-mix(in srgb,var(--danger) 7%,transparent);border-radius:0 10px 10px 0;color:var(--danger);font-size:15px;margin:18px 0}
.pain-item{display:flex;gap:12px;align-items:flex-start;padding:14px 0;border-bottom:1px dashed color-mix(in srgb,var(--danger) 25%,transparent)}
.pain-item:last-child{border-bottom:0}
.pain-item .x{color:var(--danger);font-weight:800;flex:0 0 auto}

/* ---------- 流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;counter-reset:step}
.step{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:20px}
.step b{display:block;color:var(--accent);font-size:13px;letter-spacing:1px;margin-bottom:8px}
.step h4{margin:0 0 8px;font-size:15px}
.step p{margin:0;color:var(--muted);font-size:13px}

/* ---------- 定价 ---------- */
.tier{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:16px;background:var(--panel);padding:30px}
.tier.hot{border-color:var(--accent-line);background:linear-gradient(180deg,var(--accent-soft),transparent);box-shadow:var(--card-shadow)}
.tier .name{font-size:15px;font-weight:750;color:var(--accent);letter-spacing:1px}
.tier .price{font-size:34px;font-weight:820;margin:12px 0 4px}
.tier .price small{font-size:14px;font-weight:500;color:var(--muted)}
.tier ul{margin:18px 0 0}
.tier .btn{margin-top:auto}
.tier-note{color:var(--muted);font-size:13px;margin-top:14px}

/* ---------- FAQ ---------- */
.faq details{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:0 22px;margin-bottom:12px}
.faq summary{cursor:pointer;padding:18px 0;font-weight:650;list-style:none;position:relative;padding-right:30px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);color:var(--accent);font-size:20px}
.faq details[open] summary::after{content:"–"}
.faq .ans{padding:0 0 18px;color:var(--muted);font-size:14px}

/* ---------- 表单 ---------- */
.form-panel{border:1px solid var(--line);border-radius:16px;background:var(--panel);padding:28px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.field label{font-size:13px;font-weight:650;color:var(--ink)}
.field input,.field textarea,.field select{width:100%;min-height:42px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font:inherit;font-size:14px;background:var(--input-bg);color:var(--ink)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.field textarea{resize:vertical}
.form-ok{display:none;padding:10px 14px;border-radius:10px;background:var(--accent-soft);color:var(--accent);font-size:13.5px;margin-bottom:14px}
.form-ok.show{display:block}
.form-error{display:none;padding:10px 14px;border-radius:10px;background:color-mix(in srgb,var(--danger) 10%,transparent);color:var(--danger);font-size:13.5px;margin-bottom:14px}
.form-error.show{display:block}

/* ---------- 正文 ---------- */
.doc{border:1px solid var(--line);border-radius:16px;background:var(--panel);padding:clamp(22px,4vw,44px);font-size:15px;line-height:1.95;color:var(--ink)}
.doc h2{font-size:20px;margin:30px 0 14px;padding-left:12px;border-left:4px solid var(--accent)}
.doc h3{font-size:16.5px;margin:20px 0 10px}
.doc p{margin:0 0 14px}
.doc ul,.doc ol{margin:0 0 14px;padding-left:22px}
.doc li{margin-bottom:7px}
.doc code{background:var(--panel-hi);padding:1px 6px;border-radius:5px;font-size:13px}
.doc a{color:var(--accent)}
.doc table{border-collapse:collapse;width:100%;margin-bottom:14px;font-size:14px}
.doc th,.doc td{border:1px solid var(--line);padding:8px 12px;text-align:left}

/* ---------- 页脚（双主题下都保持深色） ---------- */
.site-footer{color:var(--footer-muted);background:var(--footer-bg);border-top:1px solid var(--footer-line);padding:52px 0 28px;margin-top:40px;--ink:var(--footer-ink);--muted:var(--footer-muted);--line:var(--footer-line)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;margin-bottom:34px}
.footer-title{color:var(--footer-ink);font-weight:750;margin-bottom:14px}
.footer-list{list-style:none;padding:0;margin:0;display:grid;gap:8px;font-size:14px}
.footer-list a:hover{color:var(--footer-ink)}
.copyright{border-top:1px solid var(--footer-line);padding-top:22px;text-align:center;color:var(--footer-muted);font-size:12px}
.site-footer a:hover{color:var(--footer-ink)}

/* ---------- 响应式 ---------- */
@media (max-width:1040px){
  .grid-4,.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .case-wall{grid-template-columns:repeat(2,minmax(0,1fr))}
  .num-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
  .steps,.steps-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){.editor-grid,.grid-2{grid-template-columns:1fr}}
@media (max-width:1040px){
  .nav-links{position:absolute;top:72px;left:20px;right:20px;display:none;flex-direction:column;align-items:stretch;gap:0;padding:10px 18px;border:1px solid var(--line);border-radius:14px;background:var(--bg)}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 0;border-bottom:1px solid var(--line)}
  .nav-links .nav-cta{margin:12px 0 6px}
  .nav-has-sub .nav-sub{position:static;transform:none;box-shadow:none;border:none;padding:0 0 0 14px;margin:4px 0;border-left:2px solid var(--line);min-width:0;display:none;opacity:1;visibility:visible}
  .nav-has-sub.open .nav-sub{display:flex}
  .nav-sub a{padding:8px 0;border-bottom:none}
  .menu-toggle{display:block}
  .theme-toggle{order:-1}
}
@media (max-width:720px){
  .wrap{width:min(100% - 28px,1180px)}
  .hero{padding:118px 0 64px}
  h1{font-size:32px}
  .lead{font-size:15.5px}
  .grid-4,.grid-3,.grid-2,.num-strip,.steps,.steps-3,.footer-grid,.case-wall{grid-template-columns:1fr}
  .section{padding:62px 0}
  .brand .logo-wrap{height:44px;width:122px}
  .brand .logo-light,.brand .logo-dark{height:44px;width:122px}
}