/* ═══════════════════════════════════════
   CSS 自定义属性 (统一变量，避免重复)
═══════════════════════════════════════ */
:root {
  --blue:    #2563eb;
  --purple:  #7c3aed;
  --green:   #059669;
  --amber:   #d97706;
  --dark:    #0f172a;
  --mid:     #475569;
  --muted:   #94a3b8;
  --border:  #e2e8f0;
  --bg-soft: #f8fafc;

  --grad-brand: linear-gradient(135deg, var(--blue), var(--purple));
  --grad-dark:  linear-gradient(135deg, #1e3a8a 0%, #4c1d95 100%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,.10);
  --shadow-lg: 0 20px 48px rgba(0,0,0,.14);

  --transition: .22s ease;
}

/* ═══════════════════════════════════════
   Reset & Base
═══════════════════════════════════════ */
*,::before,::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; font-size:16px; -webkit-text-size-adjust:100%; }
body {
  font-family: -apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color: var(--dark);
  line-height: 1.6;
  background: #fff;
  overflow-x: hidden;
}
a { color:inherit; text-decoration:none; }
ul { list-style:none; }
img { max-width:100%; display:block; }
button { cursor:pointer; border:none; background:none; font:inherit; }
input,select,textarea { font:inherit; }
strong { font-weight:700; }

/* ═══════════════════════════════════════
   Layout
═══════════════════════════════════════ */
.container { max-width:1180px; margin:0 auto; padding:0 24px; }
.section-pad { padding:88px 0; }

/* ═══════════════════════════════════════
   共用原子类（去重核心）
═══════════════════════════════════════ */
/* 按钮 */
.btn {
  display:inline-flex; align-items:center; gap:7px;
  padding:11px 22px; border-radius:var(--radius-sm);
  font-size:15px; font-weight:600;
  transition: transform var(--transition), opacity var(--transition), box-shadow var(--transition);
}
.btn:hover { transform:translateY(-1px); }
.btn-sm { padding:8px 18px; font-size:14px; }
.btn-primary { background:var(--grad-brand); color:#fff; box-shadow:0 6px 20px rgba(37,99,235,.28); }
.btn-primary:hover { opacity:.9; box-shadow:0 10px 28px rgba(37,99,235,.36); }
.btn-outline { border:2px solid var(--blue); color:var(--blue); }
.btn-outline:hover { background:var(--blue); color:#fff; }
.btn-ghost { border:1.5px solid rgba(255,255,255,.35); color:#fff; }
.btn-ghost:hover { background:rgba(255,255,255,.1); }
.btn-glow {
  background:var(--grad-brand); color:#fff;
  box-shadow:0 8px 28px rgba(37,99,235,.4);
}
.btn-glow:hover { box-shadow:0 12px 36px rgba(37,99,235,.52); }
.btn-android { background:#e8f5e9; color:#2e7d32; border:1px solid #c8e6c9; }
.btn-android:hover { background:#c8e6c9; }
.btn-ios { background:var(--dark); color:#fff; }
.btn-ios:hover { background:#1e293b; }
.btn-win { background:#eff6ff; color:var(--blue); border:1px solid #bfdbfe; }
.btn-win:hover { background:#dbeafe; }
.btn-mac { background:#f3f4f6; color:#374151; border:1px solid #d1d5db; }
.btn-mac:hover { background:#e5e7eb; }
.w100 { width:100%; justify-content:center; }

/* 标签 */
.tag {
  display:inline-block;
  background:linear-gradient(135deg,#eff6ff,#f5f3ff);
  border:1px solid #bfdbfe;
  color:var(--blue);
  font-size:13px; font-weight:600;
  padding:4px 14px; border-radius:20px;
  letter-spacing:.4px;
}
.tag-light {
  background:rgba(255,255,255,.12);
  border-color:rgba(255,255,255,.3);
  color:#fff;
}

/* 区块标题组 */
.sec-head { margin-bottom:52px; }
.sec-head h2 { font-size:clamp(1.6rem,3vw,2.1rem); font-weight:800; line-height:1.3; margin:12px 0 14px; }
.sec-head p  { font-size:16px; color:var(--mid); line-height:1.8; }
.sec-head.center { text-align:center; }
.sec-head.center p { max-width:580px; margin:0 auto; }
.sec-head.light h2 { color:#fff; }
.sec-head.light p  { color:rgba(255,255,255,.7); }




/* ═══════════════════════════════════════
   导航
═══════════════════════════════════════ */
.header {
  position:sticky; top:0; z-index:999;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  transition:box-shadow var(--transition);
}
.header.scrolled { box-shadow:var(--shadow-md); }
.nav { display:flex; align-items:center; height:66px; gap:28px; }
.logo { display:flex; align-items:center; gap:9px; flex-shrink:0; }
.logo span { font-size:19px; font-weight:700; color:var(--dark); }
.logo-white span { color:#fff; }
.nav-list { display:flex; align-items:center; gap:2px; flex:1; }
.nav-a {
  padding:6px 11px; border-radius:6px;
  font-size:14px; color:var(--mid);
  transition:color var(--transition), background var(--transition);
}
.nav-a:hover,.nav-a.active { color:var(--blue); background:#eff6ff; }
.nav-right { display:flex; align-items:center; gap:14px; flex-shrink:0; }
.nav-tel { display:flex; align-items:center; gap:5px; font-size:14px; color:var(--mid); transition:color var(--transition); }
.nav-tel:hover { color:var(--blue); }
.hamburger { display:none; flex-direction:column; gap:5px; padding:6px; }
.hamburger span { display:block; width:22px; height:2px; background:var(--mid); border-radius:2px; transition:transform .3s,opacity .3s; }

/* ═══════════════════════════════════════
   HERO — 暗色科技风
═══════════════════════════════════════ */
.s-hero {
  background: radial-gradient(ellipse 80% 60% at 60% 40%, #1e1b4b 0%, #0f172a 100%);
  color:#fff;
  padding:80px 0 70px;
  overflow:hidden;
  position:relative;
}
.s-hero::before {
  content:'';
  position:absolute; inset:0;
  background: repeating-linear-gradient(
    0deg, transparent, transparent 80px,
    rgba(255,255,255,.015) 80px, rgba(255,255,255,.015) 81px
  ), repeating-linear-gradient(
    90deg, transparent, transparent 80px,
    rgba(255,255,255,.015) 80px, rgba(255,255,255,.015) 81px
  );
  pointer-events:none;
}
.hero-grid { display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center; position:relative; z-index:1; }
.pill {
  display:inline-flex; align-items:center; gap:8px;
  background:rgba(37,99,235,.18); border:1px solid rgba(37,99,235,.4);
  color:#93c5fd; padding:5px 14px; border-radius:20px;
  font-size:13px; font-weight:500; margin-bottom:20px;
}
.pulse-dot {
  width:7px; height:7px; border-radius:50%; background:var(--blue);
  animation:pulse .4s 0s infinite alternate;
}
@keyframes pulse { from{opacity:1;transform:scale(1)} to{opacity:.4;transform:scale(1.4)} }
.s-hero h1 { font-size:clamp(2rem,4vw,3rem); font-weight:900; line-height:1.2; margin-bottom:18px; letter-spacing:-.5px; }
.s-hero h1 em { font-style:normal; background:var(--grad-brand); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.hero-sub { font-size:16px; color:rgba(255,255,255,.7); line-height:1.8; margin-bottom:28px; }
.hero-sub strong { color:#fff; }
.hero-kpis { display:flex; align-items:center; gap:20px; margin-bottom:28px; background:rgba(255,255,255,.06); padding:16px 20px; border-radius:var(--radius-md); border:1px solid rgba(255,255,255,.1); }
.kpi { text-align:center; }
.kpi b { display:block; font-size:1.4rem; font-weight:800; color:#93c5fd; }
.kpi small { font-size:12px; color:rgba(255,255,255,.55); }
.kpi-sep { width:1px; height:32px; background:rgba(255,255,255,.15); }
.hero-actions { display:flex; gap:14px; margin-bottom:20px; flex-wrap:wrap; }
.dl-badges { display:flex; gap:10px; flex-wrap:wrap; }
.dl-badge {
  padding:8px 16px; border-radius:7px; font-size:13px; font-weight:600;
  border:1px solid; transition:transform var(--transition);
}
.dl-badge:hover { transform:translateY(-2px); }
.dl-badge.android { background:#1a2e1a; border-color:#3ddc84; color:#3ddc84; }
.dl-badge.ios { background:#1a1a24; border-color:#a0a0b0; color:#c0c0d0; }

/* Phone Mockup */
.hero-phone { position:relative; display:flex; justify-content:center; }
.phone-wrap { position:relative; }
.phone-body {
  width:260px;
  background:#1e1b2e;
  border:2px solid rgba(255,255,255,.1);
  border-radius:36px;
  padding:14px 11px;
  box-shadow:var(--shadow-lg), 0 0 0 1px rgba(255,255,255,.05);
}
.phone-notch {
  width:72px; height:18px;
  background:#1e1b2e;
  border-radius:0 0 12px 12px;
  margin:0 auto 10px;
  position:relative; z-index:1;
}
.phone-screen { background:#f0f4ff; border-radius:24px; overflow:hidden; padding:14px 12px 10px; }
.mock-header { display:flex; align-items:center; gap:8px; margin-bottom:12px; }
.mock-avatar { width:30px; height:30px; border-radius:50%; background:var(--grad-brand); flex-shrink:0; }
.mock-line { height:7px; border-radius:4px; background:#e2e8f0; }
.mock-line.w60 { width:60%; }
.mock-line.w40 { width:40%; }
.mt4 { margin-top:4px; }
.mock-badge { width:18px; height:18px; border-radius:50%; background:#ef4444; color:#fff; font-size:9px; font-weight:700; display:flex; align-items:center; justify-content:center; margin-left:auto; }
.mock-cards { display:grid; grid-template-columns:1fr 1fr 1fr; gap:6px; margin-bottom:10px; }
.mock-card { border-radius:8px; padding:8px 6px; text-align:center; }
.mock-card.c-blue { background:#dbeafe; } .mock-card.c-green { background:#dcfce7; } .mock-card.c-purple { background:#ede9fe; }
.mock-card span { display:block; font-size:14px; font-weight:800; color:var(--dark); }
.mock-card small { font-size:9px; color:var(--mid); }
.mock-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:6px; margin-bottom:10px; }
.mock-icon { height:28px; border-radius:8px; }
.mock-icon.i1{background:linear-gradient(135deg,#3b82f6,#2563eb)}
.mock-icon.i2{background:linear-gradient(135deg,#10b981,#059669)}
.mock-icon.i3{background:linear-gradient(135deg,#8b5cf6,#7c3aed)}
.mock-icon.i4{background:linear-gradient(135deg,#f59e0b,#d97706)}
.mock-icon.i5{background:linear-gradient(135deg,#ec4899,#db2777)}
.mock-icon.i6{background:linear-gradient(135deg,#06b6d4,#0891b2)}
.mock-list { background:#fff; border-radius:10px; padding:8px; }
.mock-row { display:flex; align-items:center; gap:6px; padding:5px 0; border-bottom:1px solid #f1f5f9; font-size:10px; color:var(--mid); }
.mock-row:last-child { border:none; }
.dot { width:7px; height:7px; border-radius:50%; flex-shrink:0; }
.dot.red { background:#ef4444; } .dot.blue { background:var(--blue); }
.mock-row span:nth-child(2) { flex:1; }
.mock-row .t { font-size:9px; color:var(--muted); flex-shrink:0; }
.phone-halo { position:absolute; bottom:-30px; left:50%; transform:translateX(-50%); width:160px; height:50px; background:radial-gradient(ellipse,rgba(37,99,235,.35),transparent); filter:blur(16px); }
.float-chip {
  position:absolute;
  background:#fff; border-radius:12px; padding:10px 14px;
  display:flex; align-items:center; gap:10px;
  box-shadow:var(--shadow-md);
  animation:floatY 3s ease-in-out infinite;
}
.chip-a { top:40px; right:-24px; animation-delay:0s; }
.chip-b { bottom:70px; left:-28px; animation-delay:1.5s; }
@keyframes floatY { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }
.float-chip span { font-size:22px; }
.float-chip b { display:block; font-size:16px; font-weight:800; color:var(--dark); }
.float-chip small { font-size:11px; color:var(--mid); }

/* ═══════════════════════════════════════
   PARTNERS — 浅灰条 + 无缝滚动
═══════════════════════════════════════ */
.s-partners { background:#f1f5f9; padding:36px 0; border-top:1px solid var(--border); border-bottom:1px solid var(--border); }
.partners-label { text-align:center; font-size:13px; color:var(--muted); text-transform:uppercase; letter-spacing:.8px; margin-bottom:20px; }
.partners-track { overflow:hidden; }
.partners-inner { display:flex; gap:32px; width:max-content; animation:marquee 22s linear infinite; }
.partners-inner span {
  font-size:14px; font-weight:600; color:#94a3b8;
  padding:7px 18px; border:1px solid var(--border); border-radius:7px;
  white-space:nowrap; transition:color var(--transition);
}
.partners-inner span:hover { color:var(--mid); }
@keyframes marquee { from{transform:translateX(0)} to{transform:translateX(-50%)} }

/* ═══════════════════════════════════════
   FEATURES — 白底 + 彩色强调卡片
═══════════════════════════════════════ */
.s-features { background:#fff; }
.feat-tabs { display:flex; gap:8px; flex-wrap:wrap; justify-content:center; margin-bottom:44px; }
.ftab { padding:9px 22px; border-radius:8px; font-size:14px; font-weight:500; color:var(--mid); border:1.5px solid var(--border); transition:all var(--transition); }
.ftab.is-on,.ftab:hover { background:var(--grad-brand); color:#fff; border-color:transparent; }
.feat-panel { display:none; }
.feat-panel.is-on { display:block; }
.feat-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:22px; }
.feat-card {
  background:var(--bg-soft);
  border:1px solid var(--border);
  border-left:4px solid var(--accent,var(--blue));
  border-radius:var(--radius-md);
  padding:26px;
  transition:box-shadow var(--transition),transform var(--transition);
}
.feat-card:hover { box-shadow:var(--shadow-md); transform:translateY(-3px); }
.feat-icon {
  width:50px; height:50px;
  background:var(--accent,var(--blue));
  border-radius:12px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:16px;
}
.feat-card h3 { font-size:17px; font-weight:700; margin-bottom:8px; color:var(--dark); }
.feat-card p { font-size:14px; color:var(--mid); line-height:1.7; margin-bottom:14px; }
.feat-card ul { display:flex; flex-direction:column; gap:5px; }
.feat-card li { font-size:13px; color:var(--mid); padding-left:14px; position:relative; }
.feat-card li::before { content:'✓'; position:absolute; left:0; color:var(--green); font-weight:700; }

/* ═══════════════════════════════════════
   SOLUTIONS — 深色网格背景
═══════════════════════════════════════ */
.s-solutions {
  background: var(--dark);
  background-image: radial-gradient(rgba(255,255,255,.04) 1px, transparent 1px);
  background-size:32px 32px;
  padding:88px 0;
}
.sol-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.sol-card {
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-md);
  padding:28px 24px;
  transition:background var(--transition),border-color var(--transition),transform var(--transition);
  display:block;
}
.sol-card:hover { background:rgba(255,255,255,.09); border-color:rgba(37,99,235,.6); transform:translateY(-4px); }
.sol-em { font-size:36px; margin-bottom:14px; }
.sol-card h3 { font-size:17px; font-weight:700; color:#fff; margin-bottom:8px; }
.sol-card p  { font-size:13px; color:rgba(255,255,255,.55); line-height:1.6; }

/* ═══════════════════════════════════════
   NUMBERS — 渐变蓝紫横幅
═══════════════════════════════════════ */
.s-numbers { background:var(--grad-dark); padding:64px 0; }
.num-row { display:grid; grid-template-columns:repeat(4,1fr); gap:32px; text-align:center; }
.num-item em { display:block; font-style:normal; font-size:14px; color:rgba(255,255,255,.65); margin-top:6px; }
.count { font-size:clamp(2rem,4vw,2.8rem); font-weight:900; color:#93c5fd; display:inline; }

/* ═══════════════════════════════════════
   CASES — 左选 右展示
═══════════════════════════════════════ */
.s-cases { background:#fff; }
.cases-wrap { display:grid; grid-template-columns:280px 1fr; gap:0; border:1px solid var(--border); border-radius:var(--radius-lg); overflow:hidden; }
.cases-nav { background:var(--bg-soft); border-right:1px solid var(--border); }
.case-nav-btn {
  width:100%; display:flex; align-items:center; gap:14px;
  padding:18px 20px; text-align:left;
  border-bottom:1px solid var(--border);
  transition:background var(--transition);
}
.case-nav-btn:last-child { border-bottom:none; }
.case-nav-btn.is-on,.case-nav-btn:hover { background:#fff; }
.case-nav-btn.is-on { box-shadow:inset 3px 0 0 var(--blue); }
.cn-logo { width:40px; height:40px; border-radius:10px; background:var(--grad-brand); color:#fff; font-size:16px; font-weight:800; display:flex; align-items:center; justify-content:center; flex-shrink:0; }
.case-nav-btn b { display:block; font-size:14px; font-weight:700; color:var(--dark); }
.case-nav-btn small { font-size:12px; color:var(--muted); }
.cases-body { padding:36px 40px; }
.case-pane { display:none; }
.case-pane.is-on { display:block; }
.case-pane blockquote { font-size:16px; font-style:italic; color:var(--mid); line-height:1.9; border-left:4px solid var(--blue); padding-left:20px; margin-bottom:16px; }
.case-by { font-size:14px; color:var(--muted); margin-bottom:28px; }
.case-kpis { display:flex; gap:32px; }
.case-kpi { text-align:center; }
.case-kpi b { display:block; font-size:1.6rem; font-weight:900; color:var(--blue); }
.case-kpi span { font-size:13px; color:var(--mid); }

/* ═══════════════════════════════════════
   PRICING — 浅灰底 卡片布局
═══════════════════════════════════════ */
.s-pricing { background:var(--bg-soft); }
.price-toggle { display:flex; align-items:center; gap:12px; justify-content:center; margin-bottom:44px; }
.price-toggle span { font-size:15px; color:var(--mid); cursor:pointer; }
.price-toggle span.is-on { color:var(--blue); font-weight:700; }
.toggle-sw {
  width:42px; height:22px;
  background:var(--border); border-radius:11px;
  cursor:pointer; position:relative; transition:background var(--transition);
}
.toggle-sw[aria-checked="true"] { background:var(--blue); }
.toggle-sw span {
  position:absolute; top:3px; left:3px;
  width:16px; height:16px; border-radius:50%; background:#fff;
  box-shadow:0 1px 3px rgba(0,0,0,.2); transition:transform var(--transition);
}
.toggle-sw[aria-checked="true"] span { transform:translateX(20px); }
.save-badge { background:#fef3c7; color:var(--amber); font-size:12px; font-weight:600; padding:3px 10px; border-radius:20px; }
.price-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:22px; align-items:start; }
.price-card {
  background:#fff; border:1.5px solid var(--border);
  border-radius:var(--radius-lg); padding:32px 26px;
  position:relative;
  transition:box-shadow var(--transition);
}
.price-card:hover { box-shadow:var(--shadow-md); }
.price-card.is-hot { border-color:var(--blue); box-shadow:0 12px 40px rgba(37,99,235,.15); }
.hot-ribbon {
  position:absolute; top:-13px; left:50%; transform:translateX(-50%);
  background:var(--grad-brand); color:#fff; font-size:12px; font-weight:700;
  padding:3px 16px; border-radius:20px; white-space:nowrap;
}
.pc-name { font-size:14px; font-weight:600; color:var(--mid); margin-bottom:14px; }
.pc-price { display:flex; align-items:baseline; gap:2px; margin-bottom:6px; }
.pc-price sup { font-size:18px; font-weight:700; color:var(--dark); }
.pc-n { font-size:2.8rem; font-weight:900; color:var(--dark); line-height:1; }
.pc-price sub { font-size:13px; color:var(--mid); margin-left:3px; }
.price-card>p { font-size:13px; color:var(--muted); margin-bottom:22px; }
.price-card ul { margin-bottom:28px; display:flex; flex-direction:column; gap:9px; }
.price-card li { font-size:14px; color:var(--mid); padding-left:20px; position:relative; }
.price-card li.ok::before { content:'✅'; position:absolute; left:0; font-size:12px; }
.price-card li.no { color:#cbd5e1; }
.price-card li.no::before { content:'—'; position:absolute; left:0; color:#cbd5e1; }

/* ═══════════════════════════════════════
   DOWNLOAD — 黑底高对比
═══════════════════════════════════════ */
.s-download { background:var(--dark); padding:88px 0; }
.dl-head { text-align:center; margin-bottom:52px; }
.dl-head h2 { color:#fff; font-size:clamp(1.6rem,3vw,2.1rem); font-weight:800; margin:12px 0 14px; }
.dl-head p { color:rgba(255,255,255,.6); font-size:16px; line-height:1.8; }
.dl-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.dl-card {
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-md);
  padding:26px;
  transition:background var(--transition),border-color var(--transition);
}
.dl-card:hover { background:rgba(255,255,255,.08); border-color:rgba(255,255,255,.2); }
.dl-head-row { display:flex; align-items:center; gap:14px; margin-bottom:20px; }
.dl-head-row strong { display:block; font-size:16px; color:#fff; }
.dl-head-row small { font-size:12px; color:var(--muted); }
.qr-box { display:flex; justify-content:center; margin-bottom:16px; }
.qr-ph {
  width:120px; height:120px;
  border:2px dashed rgba(255,255,255,.2);
  border-radius:12px;
  display:flex; align-items:center; justify-content:center;
  font-size:12px; color:rgba(255,255,255,.3);
}
.dl-pc-btns { display:flex; flex-direction:column; gap:10px; margin-bottom:14px; }
.dl-stores { display:flex; gap:10px; flex-wrap:wrap; }
.dl-stores a { font-size:12px; color:rgba(255,255,255,.4); text-decoration:underline; transition:color var(--transition); }
.dl-stores a:hover { color:rgba(255,255,255,.8); }

/* ═══════════════════════════════════════
   ABOUT — 白底两列
═══════════════════════════════════════ */
.s-about { background:#fff; }
.about-split { display:grid; grid-template-columns:1fr 1fr; gap:72px; align-items:center; }
.about-copy .tag { margin-bottom:14px; }
.about-copy h2 { font-size:clamp(1.5rem,2.5vw,2rem); font-weight:800; color:var(--dark); margin-bottom:18px; line-height:1.3; }
.about-copy p { font-size:15px; color:var(--mid); line-height:1.9; margin-bottom:14px; }
.cert-row { display:flex; flex-wrap:wrap; gap:10px; margin-top:24px; }
.cert {
  padding:8px 14px; background:var(--bg-soft);
  border:1px solid var(--border); border-radius:8px;
  font-size:13px; color:var(--mid);
}
.about-stats { display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.astat {
  border-radius:var(--radius-md);
  padding:28px 22px;
  background:var(--c,var(--blue));
  color:#fff; text-align:center;
}
.astat b { display:block; font-size:2rem; font-weight:900; margin-bottom:6px; }
.astat span { font-size:14px; opacity:.8; }

/* ═══════════════════════════════════════
   FAQ — details/summary 极简
═══════════════════════════════════════ */
.s-faq { background:var(--bg-soft); }
.faq-wrap { max-width:760px; margin:0 auto; display:flex; flex-direction:column; gap:12px; }
.faq-item { background:#fff; border:1px solid var(--border); border-radius:var(--radius-md); overflow:hidden; }
.faq-item summary {
  padding:18px 22px;
  font-size:15px; font-weight:600; color:var(--dark);
  cursor:pointer; user-select:none;
  list-style:none;
  display:flex; justify-content:space-between; align-items:center;
  transition:background var(--transition);
}
.faq-item summary::-webkit-details-marker { display:none; }
.faq-item summary::after { content:'+'; font-size:20px; color:var(--blue); font-weight:300; flex-shrink:0; transition:transform .25s; }
.faq-item[open] summary::after { transform:rotate(45deg); }
.faq-item summary:hover { background:var(--bg-soft); }
.faq-item p { padding:0 22px 18px; font-size:14px; color:var(--mid); line-height:1.8; }

/* ═══════════════════════════════════════
   CONTACT — 白底双列
═══════════════════════════════════════ */
.s-contact { background:#fff; }
.contact-grid { display:grid; grid-template-columns:3fr 2fr; gap:56px; }
.c-form { background:var(--bg-soft); border:1px solid var(--border); border-radius:var(--radius-lg); padding:32px; }
.fg-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.fg { display:flex; flex-direction:column; gap:6px; margin-bottom:16px; }
.fg label { font-size:13px; font-weight:600; color:#374151; }
.fg label span { color:#ef4444; }
.fg input,.fg select,.fg textarea {
  width:100%; padding:10px 13px;
  border:1.5px solid var(--border); border-radius:var(--radius-sm);
  font-size:14px; color:var(--dark); background:#fff;
  transition:border-color var(--transition),box-shadow var(--transition);
  outline:none;
}
.fg input:focus,.fg select:focus,.fg textarea:focus { border-color:var(--blue); box-shadow:0 0 0 3px rgba(37,99,235,.1); }
.fg-check { flex-direction:row; align-items:center; gap:8px; font-size:13px; color:var(--mid); }
.fg-check input { width:auto; }
.fg-check a { color:var(--blue); text-decoration:underline; }
.submit-btn { margin-top:8px; }
.c-info { display:flex; flex-direction:column; gap:26px; padding-top:6px; }
.ci { display:flex; gap:14px; }
.ci>span { font-size:26px; flex-shrink:0; line-height:1; }
.ci small { display:block; font-size:12px; color:var(--muted); margin-bottom:3px; }
.ci strong { display:block; font-size:15px; color:var(--dark); }
.ci strong a { color:var(--blue); }
.ci strong a:hover { text-decoration:underline; }
.wqr { width:90px; height:90px; border:2px dashed var(--border); border-radius:10px; margin-top:8px; display:flex; align-items:center; justify-content:center; font-size:11px; color:var(--muted); }

/* ═══════════════════════════════════════
   FOOTER
═══════════════════════════════════════ */
.footer { background:var(--dark); color:#fff; padding:56px 0 0; }
.ft-top { display:grid; grid-template-columns:220px 1fr; gap:56px; padding-bottom:44px; border-bottom:1px solid rgba(255,255,255,.08); }
.ft-brand .logo { margin-bottom:10px; }
.ft-brand p { font-size:13px; color:rgba(255,255,255,.45); margin-bottom:18px; }
.ft-social { display:flex; gap:8px; }
.ft-social a { padding:5px 12px; background:rgba(255,255,255,.07); border-radius:6px; font-size:13px; color:rgba(255,255,255,.6); transition:background var(--transition),color var(--transition); }
.ft-social a:hover { background:rgba(255,255,255,.13); color:#fff; }
.ft-nav { display:grid; grid-template-columns:repeat(4,1fr); gap:28px; }
.ft-col h4 { font-size:13px; font-weight:700; color:rgba(255,255,255,.85); margin-bottom:14px; }
.ft-col a { display:block; font-size:13px; color:rgba(255,255,255,.45); margin-bottom:9px; transition:color var(--transition); }
.ft-col a:hover { color:rgba(255,255,255,.85); }
.ft-bottom { padding:18px 0; display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; font-size:13px; color:rgba(255,255,255,.3); }
.ft-links { display:flex; gap:18px; }
.ft-links a { color:rgba(255,255,255,.3); transition:color var(--transition); }
.ft-links a:hover { color:rgba(255,255,255,.65); }

/* ═══════════════════════════════════════
   浮动按钮 & 回顶
═══════════════════════════════════════ */
.fab {
  position:fixed; bottom:72px; right:20px; z-index:900;
  display:flex; align-items:center; gap:7px;
  background:var(--grad-brand); color:#fff;
  padding:11px 18px; border-radius:28px; font-size:14px; font-weight:600;
  box-shadow:0 8px 24px rgba(37,99,235,.38);
  opacity:0; transform:translateY(16px);
  transition:opacity var(--transition),transform var(--transition);
}
.fab.show { opacity:1; transform:translateY(0); }
.fab:hover { transform:scale(1.04); }
.back-top {
  position:fixed; bottom:20px; right:20px; z-index:900;
  width:42px; height:42px; border-radius:50%;
  background:#fff; border:1px solid var(--border); color:var(--mid);
  display:flex; align-items:center; justify-content:center;
  box-shadow:var(--shadow-sm);
  opacity:0; transform:translateY(16px);
  transition:opacity var(--transition),transform var(--transition),background var(--transition),color var(--transition);
}
.back-top.show { opacity:1; transform:translateY(0); }
.back-top:hover { background:var(--blue); color:#fff; border-color:var(--blue); }

/* ═══════════════════════════════════════
   进场动画基类
═══════════════════════════════════════ */
.anim-up { opacity:0; transform:translateY(28px); transition:opacity .5s ease, transform .5s ease; }
.anim-up.appeared { opacity:1; transform:translateY(0); }

/* ═══════════════════════════════════════
   Responsive
═══════════════════════════════════════ */
@media (max-width:1024px) {
  .hero-grid,.about-split { grid-template-columns:1fr; }
  .hero-phone { display:none; }
  .sol-grid { grid-template-columns:repeat(2,1fr); }
  .num-row { grid-template-columns:repeat(2,1fr); }
  .price-grid { grid-template-columns:1fr; }
  .price-card.is-hot { order:-1; }
  .dl-grid { grid-template-columns:1fr; }
  .cases-wrap { grid-template-columns:1fr; }
  .cases-nav { display:flex; overflow-x:auto; border-right:none; border-bottom:1px solid var(--border); }
  .case-nav-btn { border-bottom:none; border-right:1px solid var(--border); white-space:nowrap; }
  .case-nav-btn.is-on { box-shadow:inset 0 -3px 0 var(--blue); }
  .ft-top { grid-template-columns:1fr; gap:32px; }
  .ft-nav { grid-template-columns:repeat(2,1fr); }
}
@media (max-width:768px) {
  .nav-list { display:none; position:fixed; inset:66px 0 auto; background:#fff; flex-direction:column; padding:12px; border-bottom:1px solid var(--border); box-shadow:var(--shadow-md); z-index:998; gap:2px; }
  .nav-list.open { display:flex; }
  .nav-right .nav-tel { display:none; }
  .hamburger { display:flex; }
  .feat-grid { grid-template-columns:1fr; }
  .sol-grid { grid-template-columns:1fr; }
  .contact-grid { grid-template-columns:1fr; }
  .fg-row { grid-template-columns:1fr; }
  .hero-kpis { flex-direction:column; gap:12px; }
  .kpi-sep { width:40%; height:1px; }
  .hero-actions { flex-direction:column; }
  .case-kpis { flex-wrap:wrap; gap:18px; }
  .section-pad { padding:60px 0; }
  .ft-nav { grid-template-columns:1fr 1fr; }
}
@media (max-width:480px) {
  .container { padding:0 16px; }

  .num-row { grid-template-columns:1fr 1fr; gap:20px; }
  .price-grid { gap:16px; }
  .ft-nav { grid-template-columns:1fr; }
  .about-stats { grid-template-columns:1fr 1fr; }
}