/* ============================================================
   数联智影 · 官网样式表 v2
   主题：医疗科技 · 清新明亮 · 大数据可视化 · 高转化
   主色：#0EA5E9(天蓝医疗) / 辅色：#6366F1(靛蓝科技)
   ============================================================ */

/* ---- reset & base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* 医疗科技配色 */
  --bg-base: #F0F7FF;
  --bg-white: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-section: #F8FAFF;
  --bg-dark: #0F172A;

  --primary: #0EA5E9;        /* 天蓝医疗 */
  --primary-light: #7DD3FC;
  --primary-dark: #0284C7;
  --primary-dim: rgba(14,165,233,.1);

  --secondary: #6366F1;      /* 靛蓝科技 */
  --secondary-dim: rgba(99,102,241,.1);

  --accent: #10B981;          /* 翠绿正向指标 */
  --accent-dim: rgba(16,185,129,.1);
  --amber: #F59E0B;          /* 琥珀强调 */
  --amber-dim: rgba(245,158,11,.1);

  --text: #1E293B;
  --text-secondary: #475569;
  --muted: #94A3B8;
  --border: rgba(14,165,233,.12);
  --border-strong: rgba(14,165,233,.25);

  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 12px rgba(14,165,233,.08);
  --shadow: 0 4px 24px rgba(14,165,233,.12);
  --shadow-lg: 0 8px 48px rgba(14,165,233,.16);

  --nav-h: 68px;
  --max-w: 1200px;

  /* 大数据科技色 */
  --tech-cyan: #22D3EE;
  --tech-purple: #A78BFA;
  --tech-blue: #60A5FA;
  --tech-green: #34D399;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-base);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }

::selection { background: var(--primary); color: #fff; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-section); }
::-webkit-scrollbar-thumb { background: var(--primary-light); border-radius: 3px; }

/* ---- layout helpers ---- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 100px 0; }

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 14px;
  color: var(--text);
  letter-spacing: -.02em;
}

.section-title.left { text-align: left; }

.section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 56px;
  font-size: 1.05rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-sub.left { text-align: left; margin-left: 0; }

.muted { color: var(--muted); font-size: .88rem; }

/* ---- buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 12px;
  font-weight: 700;
  font-size: .95rem;
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
  border: none;
  letter-spacing: .01em;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,.15);
  opacity: 0;
  transition: opacity .2s;
}

.btn:hover::before { opacity: 1; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(14,165,233,.35);
}
.btn-primary:hover {
  box-shadow: 0 6px 32px rgba(14,165,233,.5);
  transform: translateY(-2px) scale(1.02);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary) 0%, #4F46E5 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99,102,241,.3);
}
.btn-secondary:hover {
  box-shadow: 0 6px 32px rgba(99,102,241,.45);
  transform: translateY(-2px) scale(1.02);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border-strong);
}
.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-dim);
}

.btn-block { width: 100%; }

/* ---- nav ---- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 999;
  height: var(--nav-h);
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s;
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-right: auto;
}

.brand-mark {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #fff;
  border-radius: 12px;
  font-weight: 800;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(14,165,233,.3);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-cn { font-weight: 800; font-size: 1rem; color: var(--text); }
.brand-en { font-size: .68rem; color: var(--muted); letter-spacing: .08em; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 24px;
}

.nav-links a {
  padding: 7px 13px;
  border-radius: 8px;
  font-size: .88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color .2s, background .2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-dim);
}

.nav-cta {
  padding: 9px 20px;
  font-size: .85rem;
  border-radius: 10px;
  flex-shrink: 0;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}
.hamburger span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: .3s;
}

/* ---- TECH BACKGROUND CANVAS ---- */
#tech-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: .6;
}

/* ---- hero ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #F0F7FF 0%, #EFF6FF 40%, #F5F3FF 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(14,165,233,.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -10%; left: -5%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(99,102,241,.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 480px;
  gap: 80px;
  align-items: center;
  padding: 80px 0;
  position: relative;
  z-index: 1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.9);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: .8rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.eyebrow .pulse-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  animation: pulse-dot 1.6s ease infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: .6; }
}

.hero-left h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--text);
  letter-spacing: -.03em;
}

.hero-left h1 .blue { color: var(--primary); }
.hero-left h1 .purple { color: var(--secondary); }

.lead {
  font-size: 1.08rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
  line-height: 1.8;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 0;
  font-size: .85rem;
  color: var(--text-secondary);
}

.trust-row li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.trust-row li::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: .65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.stat-strip {
  display: flex;
  gap: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255,255,255,.95);
  box-shadow: var(--shadow-sm);
  margin-top: 40px;
}

.stat {
  flex: 1;
  padding: 20px 16px;
  text-align: center;
  border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; }

.stat-icon {
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.stat b {
  display: block;
  font-size: 1.7rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat span {
  font-size: .72rem;
  color: var(--muted);
  display: block;
  margin-top: 2px;
  font-weight: 500;
}

/* ---- data board (大数据看板) ---- */
.board {
  background: var(--bg-white);
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.board::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--tech-cyan));
}

.board-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-section);
}

.dot.live {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  animation: blink 1.4s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: .3; }
}

.board-tag {
  margin-left: auto;
  background: var(--primary-dim);
  color: var(--primary);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .05em;
}

.board-rows { padding: 8px 16px; }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 8px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
}
.row:last-child { border-bottom: none; }

.row-meta { flex: 1; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 3px;
}

.chip-blue { background: rgba(14,165,233,.1); color: var(--primary); }
.chip-purple { background: rgba(99,102,241,.1); color: var(--secondary); }
.chip-green { background: var(--accent-dim); color: #059669; }

.row-sub { font-size: .74rem; color: var(--muted); display: block; }

.row-value { text-align: right; flex-shrink: 0; }

.row-value b {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.row-value small { font-size: .72rem; color: var(--muted); margin-left: 2px; }

.trend {
  display: block;
  font-size: .7rem;
  font-weight: 600;
  margin-top: 2px;
}
.trend.up { color: var(--accent); }
.trend.down { color: #ef4444; }

/* mini bar chart */
.mini-bar {
  width: 48px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 4px;
  overflow: hidden;
  margin-left: auto;
}
.mini-bar-fill {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width 1s ease;
}

.board-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  background: linear-gradient(90deg, var(--bg-section), rgba(99,102,241,.04));
  font-size: .78rem;
  color: var(--muted);
}
.board-foot b { color: var(--primary); font-weight: 700; }

/* data icons in board */
.data-icon { font-size: 1rem; }

/* ---- metrics ---- */
.metrics {
  background: var(--bg-white);
  position: relative;
  overflow: hidden;
}

.metrics::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230EA5E9' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.metric {
  background: var(--bg-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: transform .3s cubic-bezier(.34,1.56,.64,1), box-shadow .3s;
}

.metric:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.metric::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.metric-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.metric-num {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.metric-num span { font-size: 1.6rem; }

.metric-label {
  font-size: .85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.metric-change {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  font-size: .72rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 9px;
  border-radius: 999px;
}

/* ---- services ---- */
.services { background: var(--bg-section); }

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: transform .3s cubic-bezier(.34,1.56,.64,1), box-shadow .3s, border-color .3s;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.service-card.highlight {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px rgba(14,165,233,.1), var(--shadow-lg);
}

.service-card.highlight::before {
  content: '推荐';
  position: absolute;
  top: 16px; right: 16px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: .68rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}

.service-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px; height: 60px;
  border-radius: 16px;
  background: var(--primary-dim);
}

.service-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.service-card p { font-size: .88rem; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.7; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.tag-list li {
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: .72rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.service-foot {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.service-foot b {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.service-foot span { font-size: .8rem; color: var(--muted); }

/* ---- process ---- */
.process { background: var(--bg-white); }

.process-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  position: relative;
  list-style: none;
}

.process-list::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 60px;
  right: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  z-index: 0;
  border-radius: 2px;
}

.process-list li {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 12px;
}

.step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-white);
  border: 2px solid var(--primary);
  color: var(--primary);
  font-size: .9rem;
  font-weight: 800;
  margin: 0 auto 18px;
  position: relative;
  z-index: 2;
  box-shadow: 0 4px 16px rgba(14,165,233,.15);
}

.step-icon { font-size: 1.3rem; }

.process-list h4 { font-size: .95rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.process-list p { font-size: .78rem; color: var(--text-secondary); line-height: 1.6; }

/* ---- advantages ---- */
.advantages { background: var(--bg-section); }

.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.adv-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  position: relative;
  overflow: hidden;
  transition: transform .3s cubic-bezier(.34,1.56,.64,1), box-shadow .3s, border-color .3s;
}

.adv-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.adv-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transform: scaleX(0);
  transition: transform .3s;
}

.adv-card:hover::after { transform: scaleX(1); }

.adv-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.adv-num {
  font-size: .7rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: .1em;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.adv-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.adv-card p { font-size: .82rem; color: var(--text-secondary); line-height: 1.65; }

/* ---- cases ---- */
.cases { background: var(--bg-white); }

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.case-card {
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform .3s cubic-bezier(.34,1.56,.64,1), box-shadow .3s, border-color .3s;
  position: relative;
}

.case-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-light);
  box-shadow: var(--shadow-lg);
}

.case-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--primary-dim);
  color: var(--primary);
  border-radius: 8px;
  padding: 4px 12px;
  font-size: .72rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.case-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.case-card p { font-size: .82rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.65; }

.case-kpi {
  display: flex;
  gap: 0;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-white);
}

.case-kpi li {
  flex: 1;
  text-align: center;
  padding: 14px 8px;
  border-right: 1px solid var(--border);
}
.case-kpi li:last-child { border-right: none; }

.case-kpi b {
  display: block;
  font-size: 1.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.case-kpi span { display: block; font-size: .68rem; color: var(--muted); margin-top: 2px; }

/* ---- about ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text {
  font-size: .95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.85;
}

.check-list { margin-top: 24px; }

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .9rem;
  color: var(--text);
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-weight: 500;
}

.check-list li::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: .65rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.quad-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--border);
  box-shadow: var(--shadow);
}

.quad-grid > div {
  background: var(--bg-white);
  padding: 32px 20px;
  text-align: center;
  transition: background .2s;
}

.quad-grid > div:hover { background: var(--primary-dim); }

.quad-grid b {
  display: block;
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.quad-grid span { font-size: .75rem; color: var(--text-secondary); font-weight: 500; }

/* ---- FAQ ---- */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

details {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}

details[open] {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
}

summary {
  padding: 20px 24px;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: color .2s;
}

summary::-webkit-details-marker { display: none; }

summary::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--primary);
  font-weight: 700;
  transition: transform .25s;
  flex-shrink: 0;
}

details[open] summary::after { transform: rotate(45deg); }
details[open] summary { color: var(--primary); }

details p {
  padding: 0 24px 20px;
  font-size: .88rem;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ---- contact ---- */
.contact { background: var(--bg-section); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-info { margin-top: 28px; }

.contact-info li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  font-size: .9rem;
}

.contact-info li span { font-size: 1.5rem; flex-shrink: 0; margin-top: 2px; }
.contact-info b { display: block; font-weight: 700; margin-bottom: 3px; color: var(--text); }
.contact-info small { color: var(--muted); font-size: .8rem; }

.contact-form {
  background: var(--bg-white);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
}

.contact-form h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text);
}

.contact-form .form-sub {
  font-size: .82rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.contact-form label {
  display: block;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  background: var(--bg-section);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-family: inherit;
  font-size: .9rem;
  margin-bottom: 14px;
  transition: border-color .2s, box-shadow .2s, background .2s;
  outline: none;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14,165,233,.12);
  background: var(--bg-white);
}

.contact-form select {
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394A3B8' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.contact-form textarea { resize: vertical; min-height: 80px; }

.contact-form .btn-block { margin-top: 8px; }

.form-tip { font-size: .72rem; color: var(--muted); margin-top: 10px; text-align: center; }

/* ---- footer ---- */
.footer {
  background: var(--bg-dark);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer h4 {
  font-size: .75rem;
  font-weight: 700;
  color: rgba(255,255,255,.4);
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer ul li { margin-bottom: 10px; }
.footer ul li a {
  font-size: .85rem;
  color: rgba(255,255,255,.55);
  transition: color .2s;
}
.footer ul li a:hover { color: var(--primary-light); }
.footer ul li { font-size: .82rem; color: rgba(255,255,255,.35); }

.footer .foot-brand .brand { margin-bottom: 16px; }
.footer .foot-brand p { margin-bottom: 8px; font-size: .82rem; }
.footer .brand-mark { background: linear-gradient(135deg, var(--primary), var(--secondary)); }
.footer .brand-cn { color: #fff; }

/* ---- reveal animation ---- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .6s ease, transform .6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- responsive ---- */

/* ---- floating social proof banner ---- */
.float-banner {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 998;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.float-banner .float-item {
  background: var(--bg-white);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: .78rem;
  color: var(--text);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: floatIn .5s ease both;
}

.float-banner .float-item:nth-child(2) { animation-delay: .15s; }
.float-banner .float-item:nth-child(3) { animation-delay: .3s; }

@keyframes floatIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

.float-banner .float-item b { color: var(--primary); font-weight: 700; }

/* ---- animated gradient text ---- */
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.grad-animate {
  background: linear-gradient(270deg, var(--primary), var(--secondary), var(--tech-cyan), var(--secondary), var(--primary));
  background-size: 400% 400%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 4s ease infinite;
}

/* ---- counter animation ---- */
.counter { transition: none; }

/* ============================================================
   移动端适配 v3
   断点：1024 / 768 / 480 / 375
   ============================================================ */

/* 平板 */
@media (max-width: 1024px) {
  .container { padding: 0 32px; }
  .section { padding: 80px 0; }
  .section-title { font-size: 1.95rem; }
  .hero { min-height: auto; padding-top: calc(var(--nav-h) + 24px); }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; padding: 40px 0; }
  .hero-right { max-width: 560px; margin: 0 auto; width: 100%; }
  .metric-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .service-grid { grid-template-columns: 1fr; max-width: 520px; margin: 0 auto; }
  .process-list { grid-template-columns: repeat(3, 1fr); }
  .process-list::before { display: none; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .case-grid { grid-template-columns: 1fr; max-width: 520px; margin: 0 auto; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .quad-grid { max-width: 480px; margin: 0 auto; width: 100%; }
}

/* 手机 */
@media (max-width: 768px) {
  /* 基础排版 */
  html { font-size: 15px; -webkit-text-size-adjust: 100%; }
  body { overflow-x: hidden; }
  .container { padding: 0 18px; max-width: 100%; }
  .section { padding: 56px 0; }
  .section-title { font-size: 1.55rem; margin-bottom: 10px; letter-spacing: -.01em; }
  .section-sub { font-size: .92rem; margin-bottom: 36px; padding: 0 8px; }
  .section-sub.left { padding-left: 0; padding-right: 0; }

  /* 顶栏 */
  :root { --nav-h: 56px; }
  .navbar { background: rgba(255,255,255,.92); }
  .navbar.scrolled { box-shadow: 0 2px 8px rgba(14,165,233,.08); }
  .brand { gap: 8px; }
  .brand-mark { width: 36px; height: 36px; font-size: 1.05rem; border-radius: 10px; }
  .brand-cn { font-size: .92rem; }
  .brand-en { font-size: .6rem; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 56px; left: 0; right: 0;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(20px);
    padding: 12px 18px 20px;
    gap: 2px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(14,165,233,.1);
    max-height: calc(100vh - 56px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .nav-links.open a {
    padding: 13px 16px;
    font-size: 1rem;
    border-radius: 10px;
    width: 100%;
    text-align: left;
  }
  .nav-cta { display: none; }
  .hamburger { display: flex; padding: 10px; }
  .hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  /* 顶栏加微信内顶部安全区 */
  .navbar { padding-top: env(safe-area-inset-top, 0); height: calc(var(--nav-h) + env(safe-area-inset-top, 0)); }
  .nav-inner { height: var(--nav-h); }

  /* Hero */
  .hero {
    padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0) + 16px);
    min-height: auto;
  }
  .hero::before, .hero::after { width: 320px; height: 320px; opacity: .5; }
  .hero-grid { padding: 24px 0 48px; gap: 36px; }
  .eyebrow { font-size: .72rem; padding: 5px 12px; margin-bottom: 18px; }
  .hero-left h1 { font-size: 1.7rem; line-height: 1.25; margin-bottom: 16px; letter-spacing: -.01em; }
  .lead { font-size: .9rem; line-height: 1.7; margin-bottom: 24px; }
  .hero-cta { flex-direction: column; gap: 10px; margin-bottom: 24px; }
  .hero-cta .btn { width: 100%; padding: 14px 20px; font-size: .92rem; }
  .trust-row { gap: 6px 14px; font-size: .76rem; line-height: 1.4; }
  .trust-row li { gap: 5px; }
  .trust-row li::before { width: 16px; height: 16px; font-size: .55rem; }
  .stat-strip { flex-direction: row; flex-wrap: wrap; margin-top: 28px; border-radius: 12px; }
  .stat { flex: 0 0 50%; padding: 14px 8px; border-bottom: 1px solid var(--border); border-right: none; }
  .stat:nth-child(odd) { border-right: 1px solid var(--border); }
  .stat:nth-last-child(-n+2) { border-bottom: none; }
  .stat b { font-size: 1.35rem; }
  .stat span { font-size: .65rem; }

  /* 数据看板 */
  .board { border-radius: 14px; }
  .board-head { padding: 12px 14px; font-size: .76rem; }
  .board-tag { font-size: .65rem; padding: 2px 7px; }
  .board-rows { padding: 4px 12px; }
  .row { padding: 12px 6px; gap: 8px; }
  .row-value b { font-size: 1.2rem; }
  .row-value small { font-size: .65rem; }
  .row-sub { font-size: .68rem; }
  .chip { font-size: .65rem; padding: 3px 8px; gap: 3px; }
  .mini-bar { width: 40px; }
  /* 看板底部三数据格 */
  .board > div[style*="grid-template-columns:1fr 1fr 1fr"] { padding: 12px !important; gap: 6px !important; }
  .board > div[style*="grid-template-columns:1fr 1fr 1fr"] > div { padding: 10px 6px !important; }
  .board > div[style*="grid-template-columns:1fr 1fr 1fr"] > div > div:first-child { font-size: .62rem !important; }
  .board > div[style*="grid-template-columns:1fr 1fr 1fr"] > div > div:last-child { font-size: 1rem !important; }
  .board-foot { padding: 12px 14px; font-size: .7rem; flex-wrap: wrap; gap: 4px; }

  /* 数据模块 */
  .metric-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .metric { padding: 22px 14px; border-radius: 12px; }
  .metric-icon { font-size: 1.6rem; margin-bottom: 8px; }
  .metric-num { font-size: 2.1rem; }
  .metric-num span { font-size: 1.2rem; }
  .metric-label { font-size: .76rem; }
  .metric-change { font-size: .65rem; padding: 2px 7px; margin-top: 6px; }
  .metrics::before { opacity: .4; }

  /* 核心服务 */
  .service-grid { grid-template-columns: 1fr; gap: 16px; max-width: 100%; }
  .service-card { padding: 22px 20px; border-radius: 14px; }
  .service-card.highlight::before { top: 12px; right: 12px; font-size: .62rem; padding: 2px 8px; }
  .service-icon { width: 48px; height: 48px; font-size: 1.6rem; border-radius: 12px; margin-bottom: 12px; }
  .service-card h3 { font-size: 1.05rem; }
  .service-card p { font-size: .82rem; }
  .tag-list { gap: 5px; margin-bottom: 14px; }
  .tag-list li { font-size: .65rem; padding: 3px 8px; }
  .service-foot { padding-top: 12px; }
  .service-foot b { font-size: 1.35rem; }

  /* 流程 */
  .process-list { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .step { width: 52px; height: 52px; }
  .step-icon { font-size: 1.1rem; }
  .process-list h4 { font-size: .88rem; }
  .process-list p { font-size: .72rem; }

  /* 优势 */
  .adv-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .adv-card { padding: 20px 14px; border-radius: 12px; }
  .adv-icon { font-size: 1.5rem; margin-bottom: 10px; }
  .adv-num { font-size: .6rem; margin-bottom: 6px; }
  .adv-card h3 { font-size: .9rem; }
  .adv-card p { font-size: .74rem; line-height: 1.55; }

  /* 案例 */
  .case-grid { grid-template-columns: 1fr; gap: 16px; max-width: 100%; }
  .case-card { padding: 22px 20px; border-radius: 14px; }
  .case-tag { font-size: .65rem; padding: 3px 9px; }
  .case-card h3 { font-size: .92rem; }
  .case-card p { font-size: .76rem; margin-bottom: 14px; }
  .case-kpi b { font-size: 1rem; }
  .case-kpi span { font-size: .6rem; }
  .case-kpi li { padding: 10px 6px; }

  /* 营销 Banner */
  .section[style*="linear-gradient(135deg,var(primary)"] { padding: 44px 0 !important; }
  .section[style*="linear-gradient(135deg,var(primary)"] h2 { font-size: 1.2rem; }
  .section[style*="linear-gradient(135deg,var(primary)"] p { font-size: .85rem; }
  .section[style*="linear-gradient(135deg,var(primary)"] div[style*="gap:16px"] { flex-direction: column; gap: 10px; }
  .section[style*="linear-gradient(135deg,var(primary)"] div[style*="gap:16px"] .btn { width: 100%; padding: 14px 20px !important; font-size: .92rem !important; }

  /* 关于我们 */
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .about-text { font-size: .85rem; line-height: 1.75; }
  .check-list li { font-size: .82rem; padding: 8px 0; }
  .check-list li::before { width: 20px; height: 20px; font-size: .6rem; }
  .quad-grid { grid-template-columns: 1fr 1fr; gap: 1px; border-radius: 12px; }
  .quad-grid > div { padding: 18px 8px; }
  .quad-grid b { font-size: 1.6rem; }
  .quad-grid span { font-size: .68rem; }

  /* FAQ */
  .faq-list { gap: 10px; }
  details { border-radius: 12px; }
  summary { padding: 16px 18px; font-size: .88rem; }
  details p { padding: 0 18px 16px; font-size: .82rem; padding-top: 14px; }
  summary::after { font-size: 1.1rem; }

  /* 联系 */
  .contact-info li { gap: 12px; padding: 14px 0; font-size: .82rem; }
  .contact-info li span { font-size: 1.3rem; }
  .contact-info b { font-size: .9rem; }
  .contact-info small { font-size: .72rem; }
  .contact-form { padding: 22px 18px; border-radius: 14px; }
  .contact-form h3 { font-size: 1.05rem; }
  .contact-form .form-sub { font-size: .76rem; margin-bottom: 20px; }
  .contact-form input,
  .contact-form select,
  .contact-form textarea { padding: 11px 12px; font-size: .88rem; margin-bottom: 12px; border-radius: 10px; }
  .contact-form label { font-size: .76rem; margin-bottom: 5px; }
  .contact-form .btn-block { padding: 14px 20px; font-size: .92rem; }
  .form-tip { font-size: .65rem; }
  /* 承诺模块 */
  .contact-grid > div:first-child > div[style*="margin-top:28px"] { padding: 16px !important; margin-top: 20px !important; }
  .contact-grid > div:first-child > div[style*="margin-top:28px"] ul li { font-size: .76rem !important; }
  /* 关于我们 CTA 组 */
  .about-grid > div:first-child > div[style*="margin-top:28px"] { flex-direction: column; gap: 10px; }
  .about-grid > div:first-child > div[style*="margin-top:28px"] .btn { width: 100%; padding: 13px 20px; }

  /* 页脚 */
  .footer { padding: 48px 0 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; margin-bottom: 32px; }
  .footer h4 { margin-bottom: 12px; font-size: .72rem; }
  .footer ul li { margin-bottom: 8px; }
  .footer ul li a { font-size: .82rem; }
  .foot-brand p { font-size: .76rem; }

  /* 浮动条 */
  .float-banner { bottom: 14px; right: 14px; left: 14px; gap: 6px; }
  .float-banner .float-item { font-size: .72rem; padding: 8px 12px; border-radius: 10px; }
  .float-banner .float-item:nth-child(3) { display: none; }
}

/* 小屏手机 */
@media (max-width: 480px) {
  html { font-size: 14px; }
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.4rem; }
  .hero-left h1 { font-size: 1.55rem; }
  .lead { font-size: .85rem; }
  .metric-grid { gap: 10px; }
  .metric { padding: 18px 10px; }
  .metric-num { font-size: 1.85rem; }
  .adv-grid { gap: 10px; }
  .adv-card { padding: 18px 12px; }
  .quad-grid b { font-size: 1.5rem; }
  .case-card { padding: 20px 16px; }
}

/* 极小屏 / 微信内 iPhone SE 等 */
@media (max-width: 375px) {
  html { font-size: 13px; }
  .container { padding: 0 14px; }
  .hero-left h1 { font-size: 1.45rem; }
  .stat-strip .stat b { font-size: 1.2rem; }
  .metric-num { font-size: 1.65rem; }
}

/* 横屏手机 */
@media (max-width: 900px) and (orientation: landscape) {
  .hero { min-height: auto; padding-top: calc(var(--nav-h) + 16px); }
  .hero-grid { padding: 24px 0; }
}

/* ============================================================
   微信内置浏览器适配
   ============================================================ */

/* 微信禁止下拉露出 WebView 底色 */
html, body {
  overscroll-behavior-y: contain;
  -webkit-overflow-scrolling: touch;
}

/* iOS 安全区域 */
@supports (padding: max(0px)) {
  .hero { padding-top: max(calc(var(--nav-h) + 16px), calc(var(--nav-h) + 16px + env(safe-area-inset-top))); }
  .navbar { padding-top: env(safe-area-inset-top); }
  .footer { padding-bottom: max(24px, env(safe-area-inset-bottom)); }
}

/* 微信内字体优化（避免被替换为系统字体） */
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* 微信内点击高亮去掉 */
* { -webkit-tap-highlight-color: rgba(14,165,233,.15); }

/* 微信内按钮:active 反馈 */
.btn:active, button:active {
  transform: scale(0.97);
  transition: transform .1s;
}

/* iOS 输入框默认样式重置 */
input, select, textarea {
  -webkit-appearance: none;
  appearance: none;
  border-radius: 10px;
}

/* 禁用 iOS 长按选中（仅装饰元素） */
.service-card, .case-card, .adv-card, .metric {
  -webkit-user-select: none;
  user-select: none;
}

/* 文本元素允许选中 */
p, li, h1, h2, h3, h4 { -webkit-user-select: text; user-select: text; }

/* ============================================================
   性能：手机关闭粒子画布
   ============================================================ */
@media (max-width: 768px) {
  #tech-canvas { display: none !important; }
}

/* ============================================================
   微信顶部黑色胶囊提示（可选）
   当用户在微信中打开时，显示提示「点击右上角 ··· 分享给朋友」
   ============================================================ */
.wechat-hint {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: linear-gradient(90deg, rgba(14,165,233,.95), rgba(99,102,241,.95));
  color: #fff;
  padding: 8px 16px;
  text-align: center;
  font-size: .76rem;
  font-weight: 500;
  z-index: 998;
  display: none;
  box-shadow: 0 2px 8px rgba(0,0,0,.1);
}
.wechat-hint.show { display: block; }
.wechat-hint .close {
  position: absolute;
  right: 10px; top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,.2);
  border: none;
  color: #fff;
  width: 22px; height: 22px;
  border-radius: 50%;
  font-size: .9rem;
  cursor: pointer;
  line-height: 1;
}

/* 微信内顶部导航适配 */
.wechat-in .navbar { padding-top: env(safe-area-inset-top); }

/* ============================================================
   移动端底部固定 CTA 栏（手机必加）
   ============================================================ */
.mobile-cta {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 997;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom, 0));
  display: none;
  gap: 8px;
  box-shadow: 0 -4px 16px rgba(14,165,233,.08);
}

.mobile-cta a {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 12px;
  border-radius: 10px;
  font-weight: 700;
  font-size: .88rem;
  text-decoration: none;
  white-space: nowrap;
}

.mobile-cta .cta-phone {
  background: var(--bg-section);
  color: var(--primary);
  border: 1px solid var(--border-strong);
}

.mobile-cta .cta-form {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  flex: 1.3;
}

@media (max-width: 768px) {
  .mobile-cta { display: flex; }
  /* 给底部留出空间，避免内容被遮挡 */
  body { padding-bottom: 70px; }
  .footer { padding-bottom: 80px; }
}

/* 表单成功状态 */
.form-success {
  text-align: center;
  padding: 48px 20px;
}
.form-success .icon { font-size: 3.5rem; margin-bottom: 16px; }
.form-success h3 { font-size: 1.3rem; font-weight: 800; margin-bottom: 10px; color: var(--text); }
.form-success p { color: var(--text-secondary); font-size: .9rem; }
.form-success b { color: var(--primary); }