/* ============================================================
   搜道科技 · SCI-FI 设计系统 v2.0
   深空暗色 + 霓虹渐变 · 极致AI收录友好 · 合规转化
   ============================================================ */
:root{
  --bg:#04070F;
  --bg-2:#070D1A;
  --bg-3:#0B1424;
  --surface:rgba(255,255,255,.045);
  --surface-2:rgba(255,255,255,.075);
  --border:rgba(148,163,184,.16);
  --border-glow:rgba(34,211,238,.35);
  --text:#E6EDF7;
  --text-dim:#94A3B8;
  --text-faint:#64748B;
  --cyan:#22D3EE;
  --blue:#3B82F6;
  --violet:#8B5CF6;
  --emerald:#34D399;
  --amber:#FBBF24;
  --rose:#FB7185;
  --grad:linear-gradient(120deg,#22D3EE 0%,#3B82F6 45%,#8B5CF6 100%);
  --grad-soft:linear-gradient(120deg,rgba(34,211,238,.14),rgba(139,92,246,.14));
  --grad-cta:linear-gradient(135deg,#F59E0B,#F97316);
  --shadow-card:0 20px 60px rgba(0,0,0,.45);
  --radius:18px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);background:var(--bg);color:var(--text);
  line-height:1.7;overflow-x:hidden;min-height:100vh;
}
::selection{background:rgba(34,211,238,.3)}
a{text-decoration:none;color:inherit}
img{max-width:100%}
.container{max-width:1200px;margin:0 auto;padding:0 24px;position:relative;z-index:2}

/* ---------- 星空粒子背景 ---------- */
body::before{
  content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(1px 1px at 12% 18%,rgba(255,255,255,.7),transparent 100%),
    radial-gradient(1px 1px at 32% 72%,rgba(255,255,255,.5),transparent 100%),
    radial-gradient(1.5px 1.5px at 48% 32%,rgba(255,255,255,.65),transparent 100%),
    radial-gradient(1px 1px at 66% 82%,rgba(255,255,255,.5),transparent 100%),
    radial-gradient(1.5px 1.5px at 78% 22%,rgba(255,255,255,.6),transparent 100%),
    radial-gradient(1px 1px at 88% 58%,rgba(255,255,255,.45),transparent 100%),
    radial-gradient(1px 1px at 22% 88%,rgba(255,255,255,.5),transparent 100%),
    radial-gradient(1.5px 1.5px at 55% 55%,rgba(255,255,255,.4),transparent 100%);
  animation:twinkle 6s ease-in-out infinite alternate;
}
@keyframes twinkle{0%{opacity:.55}100%{opacity:1}}

/* ---------- 极光光晕 ---------- */
.orb{position:fixed;border-radius:50%;filter:blur(90px);opacity:.32;z-index:0;pointer-events:none;animation:orbFloat 16s ease-in-out infinite alternate}
.orb-1{width:520px;height:520px;top:-160px;left:-120px;background:radial-gradient(circle,#22D3EE,transparent 70%)}
.orb-2{width:460px;height:460px;top:30%;right:-180px;background:radial-gradient(circle,#8B5CF6,transparent 70%);animation-delay:-5s}
.orb-3{width:420px;height:420px;bottom:-140px;left:28%;background:radial-gradient(circle,#3B82F6,transparent 70%);animation-delay:-9s}
@keyframes orbFloat{0%{transform:translate(0,0) scale(1)}100%{transform:translate(40px,-50px) scale(1.15)}}

/* ---------- 科幻网格地板（局部装饰） ---------- */
.grid-floor{
  position:absolute;left:50%;bottom:0;transform:translateX(-50%) perspective(600px) rotateX(60deg);
  width:160%;height:55%;z-index:0;pointer-events:none;opacity:.35;overflow:hidden;
  background:
    linear-gradient(rgba(34,211,238,.28) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,211,238,.28) 1px,transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(ellipse at center,#000 30%,transparent 75%);
          mask-image:radial-gradient(ellipse at center,#000 30%,transparent 75%);
  animation:gridMove 12s linear infinite;
}
@keyframes gridMove{0%{background-position:0 0,0 0}100%{background-position:0 44px,44px 0}}

/* ---------- 通用区块 ---------- */
.section{position:relative;padding:96px 0;z-index:1}
.section-alt{background:linear-gradient(180deg,rgba(11,20,36,.5),rgba(4,7,15,0))}
.section-head{max-width:780px;margin:0 auto 56px;text-align:center}
.section-label{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:13px;letter-spacing:.22em;color:var(--cyan);
  padding:6px 16px;border:1px solid var(--border-glow);border-radius:30px;
  background:rgba(34,211,238,.06);margin-bottom:18px;text-transform:uppercase;
}
.section-label::before,.section-label::after{content:'◆';font-size:8px;opacity:.8}
.section-title{
  font-size:clamp(28px,4.2vw,44px);font-weight:800;line-height:1.25;letter-spacing:.01em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.section-sub{color:var(--text-dim);font-size:16px;margin-top:16px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 28px;border-radius:12px;font-size:15px;font-weight:600;
  border:1px solid var(--border);cursor:pointer;transition:all .25s ease;white-space:nowrap;
}
.btn-primary{
  background:var(--grad);color:#04121F;border:none;font-weight:800;
  box-shadow:0 0 24px rgba(59,130,246,.45),0 8px 30px rgba(0,0,0,.35);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 38px rgba(139,92,246,.6),0 12px 34px rgba(0,0,0,.4)}
.btn-ghost{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan);box-shadow:0 0 18px rgba(34,211,238,.25);transform:translateY(-2px)}
.btn-cta{background:var(--grad-cta);color:#1A0F00;border:none;font-weight:800;box-shadow:0 0 22px rgba(249,115,22,.4)}
.btn-cta:hover{transform:translateY(-2px);box-shadow:0 0 32px rgba(249,115,22,.55)}
.btn-lg{padding:16px 36px;font-size:16px}

/* ---------- 顶部导航 ---------- */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(4,7,15,.72);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.logo{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:800;letter-spacing:.02em}
.logo-mark{
  width:38px;height:38px;border-radius:10px;display:grid;place-items:center;
  background:var(--grad);color:#04121F;font-weight:900;font-size:20px;
  box-shadow:0 0 18px rgba(59,130,246,.55);
}
.logo-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav-menu{display:flex;align-items:center;gap:4px;list-style:none}
.nav-menu a{
  display:block;padding:9px 15px;font-size:14.5px;color:var(--text-dim);border-radius:9px;transition:all .2s;
}
.nav-menu a:hover,.nav-menu a.active{color:var(--cyan);background:rgba(34,211,238,.08)}
.nav-cta{background:var(--grad-cta);color:#1A0F00 !important;font-weight:700;padding:9px 20px !important}
.nav-cta:hover{opacity:.92;color:#1A0F00 !important;background:var(--grad-cta) !important;box-shadow:0 0 16px rgba(249,115,22,.45)}
.mobile-menu-btn{display:none;background:none;border:1px solid var(--border);color:var(--text);font-size:20px;width:42px;height:42px;border-radius:10px;cursor:pointer}
.mobile-menu{display:none;position:absolute;top:74px;left:0;right:0;background:rgba(4,7,15,.97);border-bottom:1px solid var(--border);padding:14px 20px 20px;flex-direction:column;gap:6px}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:12px 14px;color:var(--text-dim);border-radius:10px}
.mobile-menu a:hover{color:var(--cyan);background:rgba(34,211,238,.08)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:120px 0 90px}
.hero::before{content:'';position:absolute;inset:0;z-index:0;
  background:radial-gradient(ellipse at 20% 0%,rgba(34,211,238,.14),transparent 55%),
             radial-gradient(ellipse at 85% 20%,rgba(139,92,246,.16),transparent 55%);
}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border-radius:30px;
  background:rgba(34,211,238,.08);border:1px solid var(--border-glow);
  color:var(--cyan);font-size:13px;font-family:var(--mono);letter-spacing:.1em;margin-bottom:22px;
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--emerald);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(52,211,153,.5)}50%{box-shadow:0 0 0 8px rgba(52,211,153,0)}}
.hero h1{
  font-size:clamp(32px,5vw,54px);font-weight:900;line-height:1.18;letter-spacing:.01em;
  margin-bottom:22px;
}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero h1 .typing{border-right:3px solid var(--cyan);padding-right:6px;white-space:nowrap;display:inline-block;overflow:visible;max-width:100%;vertical-align:baseline}
.hero-sub{font-size:17px;color:var(--text-dim);max-width:560px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:40px}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:640px}
.hstat{
  padding:14px 10px;border-radius:14px;text-align:center;
  background:var(--surface);border:1px solid var(--border);backdrop-filter:blur(8px);
}
.hstat .num{font-size:24px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hstat .lbl{font-size:12px;color:var(--text-faint);margin-top:2px}

/* Hero 视觉：轨道环 + 终端卡 */
.hero-visual{position:relative;height:480px;display:grid;place-items:center}
.ring{position:absolute;border-radius:50%;border:1px solid rgba(34,211,238,.25)}
.ring-1{width:340px;height:340px;animation:spin 26s linear infinite}
.ring-2{width:460px;height:460px;border-color:rgba(139,92,246,.22);animation:spin 40s linear infinite reverse}
.ring-3{width:580px;height:580px;border-color:rgba(59,130,246,.16);animation:spin 60s linear infinite}
.ring::before{content:'';position:absolute;top:-5px;left:50%;width:10px;height:10px;border-radius:50%;background:var(--cyan);box-shadow:0 0 14px var(--cyan)}
.ring-2::before{background:var(--violet);box-shadow:0 0 14px var(--violet)}
.ring-3::before{background:var(--blue);box-shadow:0 0 14px var(--blue)}
@keyframes spin{to{transform:rotate(360deg)}}
.hero-core{
  width:200px;height:200px;border-radius:50%;display:grid;place-items:center;text-align:center;
  background:radial-gradient(circle at 30% 30%,rgba(34,211,238,.35),rgba(59,130,246,.22) 45%,rgba(139,92,246,.15));
  border:1px solid var(--border-glow);box-shadow:0 0 80px rgba(34,211,238,.28),inset 0 0 60px rgba(59,130,246,.18);
  animation:float 6s ease-in-out infinite;
}
.hero-core .core-txt{font-size:15px;font-weight:800;color:#fff}
.hero-core .core-sub{font-size:11px;color:var(--cyan);letter-spacing:.18em;margin-top:4px}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}
.term-card{
  position:absolute;width:250px;border-radius:14px;overflow:hidden;
  background:rgba(7,13,26,.88);border:1px solid var(--border);
  backdrop-filter:blur(12px);box-shadow:var(--shadow-card);font-family:var(--mono);font-size:12px;
  animation:float 7s ease-in-out infinite;
}
.term-card .term-bar{display:flex;gap:6px;padding:9px 12px;background:rgba(255,255,255,.05);border-bottom:1px solid var(--border)}
.term-card .term-bar i{width:9px;height:9px;border-radius:50%}
.term-card .term-bar i:nth-child(1){background:var(--rose)}.term-card .term-bar i:nth-child(2){background:var(--amber)}.term-card .term-bar i:nth-child(3){background:var(--emerald)}
.term-card .term-body{padding:12px 14px;line-height:1.9;color:var(--text-dim)}
.term-card .term-body b{color:var(--cyan);font-weight:600}
.term-card .ok{color:var(--emerald)}
.term-1{top:8%;left:-4%;animation-delay:-2s}
.term-2{bottom:6%;right:-6%;animation-delay:-4s}
.term-3{top:44%;right:-14%;animation-delay:-1s;width:220px}

/* ---------- 信任条 ---------- */
.trust-strip{padding:34px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:rgba(255,255,255,.02)}
.trust-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px}
.trust-item{display:flex;align-items:center;gap:12px;color:var(--text-dim);font-size:14.5px}
.trust-item .ico{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-size:20px;background:var(--grad-soft);border:1px solid var(--border)}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.glass-card{
  position:relative;border-radius:var(--radius);padding:30px 26px;
  background:var(--surface);border:1px solid var(--border);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
  overflow:hidden;
}
.glass-card::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.25),transparent)}
.glass-card:hover{
  transform:translateY(-6px);border-color:var(--border-glow);
  box-shadow:0 0 34px rgba(34,211,238,.12),var(--shadow-card);
}
.card-ico{width:52px;height:52px;border-radius:13px;display:grid;place-items:center;font-size:26px;margin-bottom:18px;background:var(--grad-soft);border:1px solid var(--border)}
.glass-card h3{font-size:19px;font-weight:700;margin-bottom:10px}
.glass-card p{color:var(--text-dim);font-size:14.5px}
.card-tag{
  display:inline-block;font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;
  color:var(--cyan);padding:3px 10px;border:1px solid var(--border-glow);border-radius:20px;margin-bottom:12px;
}
.glass-card .more{display:inline-flex;align-items:center;gap:6px;margin-top:16px;font-size:14px;color:var(--cyan);font-weight:600}
.glass-card .more:hover{text-shadow:0 0 12px rgba(34,211,238,.7)}

/* ---------- 双赛道/特性行 ---------- */
.feature-row{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.feature-block{
  padding:34px 30px;border-radius:var(--radius);position:relative;overflow:hidden;
  background:var(--surface);border:1px solid var(--border);backdrop-filter:blur(12px);
}
.feature-block .feat-ico{font-size:34px;margin-bottom:14px}
.feature-block h3{font-size:22px;margin-bottom:12px}
.feature-block ul{list-style:none;margin-top:14px}
.feature-block li{position:relative;padding:7px 0 7px 26px;color:var(--text-dim);font-size:14.5px}
.feature-block li::before{content:'▹';position:absolute;left:0;color:var(--cyan)}
.feature-block .feat-num{position:absolute;top:18px;right:24px;font-family:var(--mono);font-size:13px;color:var(--text-faint)}

/* ---------- 流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step{position:relative;padding:26px 20px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);text-align:center}
.step::before{
  counter-increment:step;content:'0' counter(step);
  display:block;font-family:var(--mono);font-size:30px;font-weight:800;margin-bottom:10px;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.step h4{font-size:16px;margin-bottom:8px}
.step p{font-size:13.5px;color:var(--text-dim)}
.step::after{content:'';position:absolute;top:50%;right:-14px;width:8px;height:8px;border-top:1.5px solid var(--cyan);border-right:1.5px solid var(--cyan);transform:rotate(45deg)}
.step:last-child::after{display:none}

/* ---------- 案例 ---------- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case-card-sci{overflow:hidden;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);transition:all .3s ease}
.case-card-sci:hover{transform:translateY(-6px);border-color:var(--border-glow);box-shadow:0 0 30px rgba(34,211,238,.14)}
.case-top{height:150px;display:grid;place-items:center;position:relative;overflow:hidden;font-size:17px;font-weight:800;color:#fff;background:linear-gradient(135deg,#0E7490,#4338CA)}
.case-top::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(3,7,18,.7))}
.case-top span{position:relative;z-index:2}
.case-top .tag{position:absolute;top:14px;left:14px;z-index:3;font-size:11px;font-family:var(--mono);letter-spacing:.1em;color:var(--cyan);background:rgba(3,7,18,.75);border:1px solid var(--border-glow);padding:3px 10px;border-radius:20px}
.case-body{padding:20px 20px 22px}
.case-body h3{font-size:16.5px;margin-bottom:8px;line-height:1.45}
.case-body .case-meta{font-size:12.5px;color:var(--text-faint);margin-bottom:10px;display:flex;gap:12px}
.case-body p{font-size:13.5px;color:var(--text-dim);line-height:1.7}

/* ---------- 统计 ---------- */
.stat-band{padding:64px 0;position:relative;overflow:hidden}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-box .big{font-size:44px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;text-shadow:0 0 30px rgba(59,130,246,.3)}
.stat-box .lbl{color:var(--text-dim);font-size:14px;margin-top:6px}

/* ---------- 城市站群 ---------- */
.city-visual{position:relative;height:380px;display:grid;place-items:center;border-radius:var(--radius);border:1px solid var(--border);background:var(--grad-soft);overflow:hidden}
.city-dot{position:absolute;width:12px;height:12px;border-radius:50%;background:var(--cyan);box-shadow:0 0 14px var(--cyan);animation:pulse 2.4s infinite}
.city-dot:nth-child(2){left:18%;top:30%;animation-delay:-.4s}
.city-dot:nth-child(3){left:38%;top:62%;animation-delay:-.8s}
.city-dot:nth-child(4){left:62%;top:24%;animation-delay:-1.2s}
.city-dot:nth-child(5){left:80%;top:56%;animation-delay:-1.6s}
.city-dot:nth-child(6){left:50%;top:40%;animation-delay:-2s}
.city-grid-intro{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.city-stats{display:flex;gap:26px;margin:22px 0}
.city-stat .num{font-size:26px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.city-stat .lbl{font-size:12.5px;color:var(--text-faint)}
.city-features{list-style:none;margin-top:8px}
.city-features li{position:relative;padding:8px 0 8px 24px;color:var(--text-dim);font-size:14.5px}
.city-features li::before{content:'▹';position:absolute;left:0;color:var(--cyan)}

/* ---------- FAQ（豆包AEO） ---------- */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{
  margin-bottom:14px;border-radius:14px;overflow:hidden;
  background:var(--surface);border:1px solid var(--border);backdrop-filter:blur(8px);
}
.faq-item summary{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:18px 22px;cursor:pointer;font-size:15.5px;font-weight:600;list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item .plus{color:var(--cyan);font-family:var(--mono);transition:transform .3s;flex-shrink:0}
.faq-item[open] .plus{transform:rotate(45deg)}
.faq-item .faq-a{padding:0 22px 18px;color:var(--text-dim);font-size:14.5px;line-height:1.8}

/* ---------- 表单 ---------- */
.form-card{
  border-radius:var(--radius);padding:36px 32px;
  background:var(--surface);border:1px solid var(--border-glow);
  backdrop-filter:blur(14px);box-shadow:0 0 40px rgba(59,130,246,.12);
}
.form-card h3{font-size:22px;margin-bottom:6px}
.form-card .sub{color:var(--text-dim);font-size:14px;margin-bottom:22px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-group{margin-bottom:14px}
.form-group.full{grid-column:1/-1}
.form-group label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:6px}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:12px 14px;border-radius:10px;font-size:14.5px;color:var(--text);
  background:rgba(255,255,255,.05);border:1px solid var(--border);outline:none;transition:border-color .2s,box-shadow .2s;font-family:var(--font);
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,211,238,.14)}
.form-group textarea{resize:vertical;min-height:90px}
.form-note{font-size:12.5px;color:var(--text-faint);margin-top:12px}

/* ---------- CTA 横幅 ---------- */
.cta-band{
  position:relative;border-radius:22px;padding:56px 48px;overflow:hidden;
  background:linear-gradient(120deg,rgba(14,116,144,.35),rgba(67,56,202,.35));
  border:1px solid var(--border-glow);text-align:center;
}
.cta-band::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 50% 120%,rgba(34,211,238,.2),transparent 60%);pointer-events:none}
.cta-band h2{font-size:clamp(24px,3.6vw,38px);font-weight:800;margin-bottom:14px}
.cta-band p{color:var(--text-dim);max-width:560px;margin:0 auto 28px}

/* ---------- 页脚 ---------- */
.footer{position:relative;border-top:1px solid var(--border);background:rgba(3,6,12,.6);padding:64px 0 0;margin-top:40px;z-index:1}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:44px}
.footer h4{font-size:15px;margin-bottom:16px;color:var(--text)}
.footer ul{list-style:none}
.footer ul li{margin-bottom:10px}
.footer ul a{color:var(--text-dim);font-size:14px;transition:color .2s}
.footer ul a:hover{color:var(--cyan)}
.footer .f-desc{color:var(--text-dim);font-size:14px;margin:14px 0 20px}
.f-contact{display:flex;flex-direction:column;gap:10px}
.f-contact span{color:var(--text-dim);font-size:14px;display:flex;gap:8px;align-items:center}
.f-contact b{color:var(--cyan);font-weight:600}
.footer-bottom{
  border-top:1px solid var(--border);padding:20px 0;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;
  color:var(--text-faint);font-size:13px;
}
.footer-bottom a{color:var(--text-faint)}
.footer-bottom a:hover{color:var(--cyan)}

/* ---------- 悬浮 CTA / 回顶 ---------- */
.float-cta{display:none;position:fixed;left:0;right:0;bottom:0;z-index:99;padding:10px 14px 12px;background:rgba(4,7,15,.92);backdrop-filter:blur(14px);border-top:1px solid var(--border)}
.float-cta .btn{flex:1}
.back-top{
  position:fixed;right:22px;bottom:92px;z-index:98;width:46px;height:46px;border-radius:12px;
  display:grid;place-items:center;background:var(--surface);border:1px solid var(--border-glow);
  color:var(--cyan);font-size:18px;cursor:pointer;transition:all .3s;backdrop-filter:blur(8px);
}
.back-top:hover{background:rgba(34,211,238,.15);box-shadow:0 0 18px rgba(34,211,238,.3)}

/* ---------- 面包屑 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13.5px;color:var(--text-faint);margin-bottom:26px}
.breadcrumb a{color:var(--text-dim)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb .sep{color:var(--text-faint)}

/* ---------- 页头横幅 ---------- */
.page-hero{position:relative;padding:96px 0 72px;overflow:hidden;text-align:center}
.page-hero::before{content:'';position:absolute;inset:0;z-index:0;
  background:radial-gradient(ellipse at 50% 0%,rgba(59,130,246,.16),transparent 60%),radial-gradient(ellipse at 20% 100%,rgba(139,92,246,.12),transparent 55%)}
.page-hero h1{font-size:clamp(30px,4.6vw,48px);font-weight:900;margin-bottom:16px;position:relative;z-index:1}
.page-hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.page-hero p{color:var(--text-dim);max-width:660px;margin:0 auto;position:relative;z-index:1;font-size:16px}

/* ---------- 徽章墙 ---------- */
.badge-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:28px}
.badge-chip{
  display:inline-flex;align-items:center;gap:7px;padding:8px 16px;border-radius:24px;
  background:var(--surface);border:1px solid var(--border);font-size:13px;color:var(--text-dim);
}
.badge-chip b{color:var(--cyan)}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-visual{height:420px}
  .grid-4,.grid-3,.steps{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .feature-row,.city-grid-intro,.footer-grid{grid-template-columns:1fr}
  .term-3{display:none}
}
@media(max-width:768px){
  .section{padding:64px 0}
  .nav-menu{display:none}
  .mobile-menu-btn{display:block}
  .hero{padding:80px 0 60px}
  .hero-visual{height:340px;transform:scale(.85)}
  .grid-3,.grid-4,.grid-2,.steps,.case-grid,.hero-stats{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr}
  .step::after{display:none}
  .form-grid{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .float-cta{display:flex;gap:10px}
  .back-top{bottom:86px}
  .footer-bottom{flex-direction:column;text-align:center}
  .trust-inner{justify-content:flex-start}
}
@media(max-width:480px){
  .grid-3,.grid-4,.grid-2,.hero-stats{grid-template-columns:1fr}
  .hero-actions .btn{width:100%}
}