/* ============================================
   美涵科技 — 全站样式 v4（彻底重构）
   设计原则：真实 + 高级 + 协调
   参考：Linear / Vercel / Stripe
   ============================================ */

/* ---------- 品牌色系统 ---------- */
:root {
  /* 品牌蓝（清新科技） */
  --navy-50: #eff6ff;
  --navy-100: #dbeafe;
  --navy-200: #bfdbfe;
  --navy-300: #93c5fd;
  --navy-400: #60a5fa;
  --navy-500: #3b82f6;
  --navy-600: #2563eb;
  --navy-700: #1d4ed8;
  --navy-800: #1e40af;
  --navy-900: #0c1d3d;
  --navy-950: #0a1631;

  /* 强调色：琥珀橙 */
  --amber-50: #fef9ec;
  --amber-100: #fdebc4;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-600: #d97706;

  /* 中性灰 */
  --gray-25: #fcfcfd;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* 语义色 */
  --success: #059669;
  --success-bg: #d1fae5;
  --danger: #dc2626;
  --danger-bg: #fee2e2;
  --warning: #d97706;
  --warning-bg: #fef3c7;

  /* 字体 */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;

  /* 容器 */
  --container: 1200px;
  --container-narrow: 880px;
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-900);
  background: white;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ---------- 排版层级 ---------- */
h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; color: var(--gray-900); }
h1 { font-size: 56px; line-height: 1.05; letter-spacing: -0.035em; font-weight: 700; }
h2 { font-size: 40px; line-height: 1.1; letter-spacing: -0.03em; font-weight: 700; }
h3 { font-size: 22px; font-weight: 600; }
h4 { font-size: 17px; font-weight: 600; }
p { color: var(--gray-600); line-height: 1.65; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--gray-200);
  z-index: 100;
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  height: 64px;
  display: flex; justify-content: space-between; align-items: center;
}
.logo {
  display: flex; align-items: center; gap: 12px;
  font-size: 19px; font-weight: 600;
  color: var(--navy-900);
  letter-spacing: -0.01em;
}
.logo-mark {
  width: 32px; height: 32px;
  background: transparent;
  border-radius: 7px;
  object-fit: contain;
}
.logo-mark-footer {
  background: white;
  width: 36px; height: 36px;
  padding: 6px;
}
.nav-menu { display: flex; gap: 36px; }
.nav-menu a {
  font-size: 14px; font-weight: 500;
  color: var(--gray-600);
  transition: color 0.15s;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--navy-900); }

/* ---------- 按钮（统一两种）---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
  border: 1px solid transparent;
  gap: 6px;
  white-space: nowrap;
}
.btn-primary { background: var(--navy-600); color: white; }
.btn-primary:hover { background: var(--navy-700); }
.btn-secondary { background: white; color: var(--gray-900); border-color: var(--gray-300); }
.btn-secondary:hover { border-color: var(--gray-900); background: var(--gray-50); }
.btn-large { padding: 13px 22px; font-size: 15px; }
.btn-arrow::after {
  content: '→';
  font-size: 16px;
  transition: transform 0.15s;
}
.btn-arrow:hover::after { transform: translateX(2px); }

/* ---------- 通用容器 ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }
section { padding: 112px 0; }
.section-head { margin-bottom: 64px; }
.section-head.text-center { text-align: center; }
.section-head h2 { margin-bottom: 16px; max-width: 720px; }
.section-head p { font-size: 18px; max-width: 640px; }
.section-head.text-center h2,
.section-head.text-center p { margin-left: auto; margin-right: auto; }
.section-head-center { text-align: center; }
.section-head-center h2,
.section-head-center p { margin-left: auto; margin-right: auto; }

/* ---------- Hero（所有页面统一）---------- */
.hero {
  position: relative;
  padding: 140px 0 160px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.85) 0%, rgba(239,246,255,0.75) 100%),
    url('../images/hero-bg.jpg') center / cover no-repeat;
  overflow: hidden;
  border-bottom: 1px solid var(--gray-200);
}
.hero-compact { padding: 72px 0 88px; }
.hero-compact h1 {
  font-size: 18px; font-weight: 500;
  color: var(--gray-600); letter-spacing: 0;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.hero-compact h2 {
  font-size: 44px; font-weight: 700;
  color: var(--gray-900); line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}
.hero-compact .hero-sub {
  font-size: 19px;
  max-width: 680px;
  margin-left: auto; margin-right: auto;
}
.hero-inner-center {
  display: block !important;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
  padding: 0 32px;
}
.modules-flow {
  margin: 0 auto 64px;
  max-width: 1200px;
  padding: 0 32px;
}
.modules-flow img {
  width: 100%; height: auto; display: block;
}
.hero-inner {
  position: relative;
  z-index: 1;
}
.hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 500;
  color: var(--navy-900);
  background: white;
  border: 1px solid var(--navy-300);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 24px;
}
.hero-tag .dot {
  width: 6px; height: 6px;
  background: var(--success);
  border-radius: 50%;
}
.hero h1 { margin-bottom: 16px; color: var(--gray-900); font-size: 44px; line-height: 1.15; letter-spacing: -0.025em; font-weight: 700; }
.hero h2 {
  margin-bottom: 40px;
  color: var(--gray-700);
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 500;
}
.hero h1 .accent,
.hero h2 .accent {
  color: var(--navy-700);
  font-weight: 600;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-image img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 20px 50px -10px rgba(15, 42, 71, 0.15),
    0 30px 60px -30px rgba(15, 42, 71, 0.25);
}

/* ---------- Mockup（CSS/SVG 做的产品视觉）---------- */
.mockup {
  position: relative;
  width: 100%;
}
.mockup-card {
  background: white;
  border-radius: 12px;
  box-shadow:
    0 1px 2px rgba(15, 42, 71, 0.04),
    0 10px 30px -10px rgba(15, 42, 71, 0.12),
    0 30px 60px -30px rgba(15, 42, 71, 0.2),
    0 0 0 1px rgba(15, 42, 71, 0.04);
  overflow: hidden;
}
.mockup-header {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}
.mockup-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--gray-300); }
.mockup-dot.red { background: #ff5f57; }
.mockup-dot.yellow { background: #febc2e; }
.mockup-dot.green { background: #28c840; }
.mockup-title {
  margin-left: 8px;
  font-size: 12px;
  color: var(--gray-500);
  font-family: var(--font-mono);
}

/* 仪表盘 mockup */
.dashboard { background: white; padding: 0; }
.dashboard-body { padding: 24px; }
.dashboard-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.dashboard-kpi {
  padding: 14px;
  background: var(--gray-50);
  border-radius: 8px;
  border: 1px solid var(--gray-200);
}
.dashboard-kpi-label {
  font-size: 11px;
  color: var(--gray-500);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.dashboard-kpi-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--navy-900);
  margin-top: 4px;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}
.dashboard-kpi-delta {
  font-size: 11px;
  color: var(--success);
  font-weight: 600;
  margin-top: 2px;
}
.dashboard-chart {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 16px;
}
.dashboard-chart-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px;
}
.dashboard-chart-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--navy-900);
}
.dashboard-chart-legend {
  display: flex; gap: 12px;
  font-size: 10px;
  color: var(--gray-500);
}
.dashboard-chart-legend span::before {
  content: '';
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 2px;
  margin-right: 4px;
  vertical-align: middle;
}
.dashboard-chart-legend .l1::before { background: var(--navy-700); }
.dashboard-chart-legend .l2::before { background: var(--amber-500); }
.dashboard-bars {
  display: flex; align-items: flex-end;
  gap: 6px;
  height: 80px;
}
.dashboard-bars .bar-group {
  flex: 1;
  display: flex; gap: 2px;
  align-items: flex-end;
  height: 100%;
}
.dashboard-bars .bar {
  flex: 1;
  border-radius: 2px 2px 0 0;
  min-height: 4px;
}
.dashboard-bars .bar.b1 { background: var(--navy-700); }
.dashboard-bars .bar.b2 { background: var(--amber-500); }

.dashboard-list {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  overflow: hidden;
}
.dashboard-list-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--gray-100);
  font-size: 12px;
}
.dashboard-list-row:last-child { border-bottom: none; }
.dashboard-list-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dashboard-list-dot.green { background: var(--success); }
.dashboard-list-dot.red { background: var(--danger); }
.dashboard-list-dot.amber { background: var(--amber-500); }
.dashboard-list-name { font-weight: 600; color: var(--navy-900); flex: 1; }
.dashboard-list-meta { color: var(--gray-500); font-family: var(--font-mono); font-size: 11px; }

/* ---------- 痛点 / 功能卡（统一风格）---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--gray-200);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  overflow: hidden;
}
.feature-card {
  background: white;
  padding: 32px;
  transition: background 0.15s;
}
.feature-card:hover { background: var(--gray-25); }
.feature-icon {
  width: 40px; height: 40px;
  background: var(--navy-50);
  color: var(--navy-800);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 20px;
}
.feature-card h3 { margin-bottom: 8px; font-size: 18px; }
.feature-card p { font-size: 14px; line-height: 1.6; }
.feature-card-image { padding: 0; overflow: hidden; }
.feature-card-image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}
.feature-card-image h3,
.feature-card-image p { padding: 0 28px; }
.feature-card-image h3 { padding-top: 24px; }
.feature-card-image p { padding-bottom: 28px; }

/* ---------- AI 区块（深色）---------- */
.ai-section {
  background: var(--navy-900);
  color: white;
  padding: 112px 0;
  position: relative;
  overflow: hidden;
}
.ai-section::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
  pointer-events: none;
}
.ai-section h2 { color: white; }
.ai-section .section-head p { color: var(--navy-200); }
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
}
.ai-image img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.4);
}
.ai-feature-list {
  display: flex; flex-direction: column;
}
.ai-feature-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.ai-feature-item:last-child { border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
.ai-feature-num {
  width: 40px; height: 40px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  color: var(--navy-200);
}
.ai-feature-content strong {
  display: block;
  color: white;
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}
.ai-feature-content span {
  color: var(--navy-200);
  font-size: 14px;
  line-height: 1.65;
}

/* 终端 mockup */
.terminal { padding: 0; }
.terminal-body {
  background: var(--navy-950);
  padding: 20px 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.85);
}
.terminal-body .t-label { color: rgba(255, 255, 255, 0.4); margin-right: 4px; }
.terminal-body .t-key { color: #93c5fd; }
.terminal-body .t-val { color: #fcd34d; }
.terminal-body .t-success { color: #86efac; }
.terminal-body .t-alert { color: #fca5a5; }
.terminal-body .t-divider { height: 1px; background: rgba(255, 255, 255, 0.08); margin: 12px 0; }
.terminal-body .t-alert-card {
  background: rgba(252, 165, 165, 0.08);
  border-left: 2px solid #fca5a5;
  padding: 10px 12px;
  border-radius: 0 6px 6px 0;
  margin-top: 10px;
}
.terminal-body .t-alert-card .t-alert { font-weight: 600; font-size: 12px; }

/* ---------- 表格 ---------- */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  overflow: hidden;
}
.compare-table th,
.compare-table td {
  padding: 18px 24px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table th {
  background: var(--gray-50);
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-700);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.compare-table td { font-size: 14px; }
.compare-table .col-label { font-weight: 600; color: var(--gray-900); }
.compare-table .col-highlight { color: var(--navy-700); font-weight: 600; }

/* ---------- 时间线 ---------- */
.timeline { max-width: 760px; margin: 0 auto; }
.timeline-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 32px;
  padding: 28px 0;
  border-top: 1px solid var(--gray-200);
}
.timeline-item:last-child { border-bottom: 1px solid var(--gray-200); }
.timeline-date {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--navy-700);
  padding-top: 2px;
}
.timeline-content h4 { margin-bottom: 6px; font-size: 17px; }
.timeline-content p { font-size: 14px; line-height: 1.65; }

/* ---------- 发展历程 竖向时间线（升级版）---------- */
.history-timeline {
  max-width: 880px;
  margin: 0 auto;
  position: relative;
}
.history-timeline::before {
  content: '';
  position: absolute;
  left: 130px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(180deg,
    var(--navy-300) 0%,
    var(--navy-500) 50%,
    var(--navy-700) 100%);
}
.history-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 64px;
  padding: 0 0 36px 0;
  position: relative;
}
.history-item:last-child { padding-bottom: 0; }
.history-marker {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--navy-700);
  text-align: right;
  padding-top: 18px;
  position: relative;
}
.history-marker::before {
  content: '';
  position: absolute;
  right: -22px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: white;
  border: 3px solid var(--navy-600);
  box-shadow: 0 0 0 4px white;
  z-index: 1;
}
.history-item:first-child .history-marker::before {
  background: var(--navy-600);
  box-shadow: 0 0 0 4px white, 0 0 0 8px rgba(37, 99, 235, 0.2);
}
.history-content {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 24px 28px;
  position: relative;
  transition: all 0.2s ease;
}
.history-content::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 28px;
  width: 14px;
  height: 14px;
  background: white;
  border-left: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  transform: rotate(45deg);
}
.history-content:hover {
  border-color: var(--navy-300);
  box-shadow: 0 12px 32px -12px rgba(15,42,71,0.15);
  transform: translateX(4px);
}
.history-content h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 8px;
}
.history-content p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--gray-600);
}

/* ---------- 行业英雄区（session 场景图）---------- */
.industry-hero {
  margin: 0 auto 56px;
  max-width: 1200px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow:
    0 1px 2px rgba(0,0,0,0.04),
    0 20px 50px -10px rgba(15,42,71,0.15),
    0 30px 60px -30px rgba(15,42,71,0.25);
}
.industry-hero img {
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- 信息标签 chip ---------- */
.info-chips {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.info-chip {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  color: var(--navy-800);
  background: var(--navy-50);
  border: 1px solid var(--navy-200);
  padding: 6px 12px;
  border-radius: 999px;
  font-weight: 500;
}

/* ---------- 实施流程 5 列卡片 ---------- */
.process-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  gap: 12px;
  align-items: stretch;
  max-width: 1400px;
  margin: 0 auto;
}
.process-step {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 14px;
  padding: 28px 20px;
  text-align: center;
  position: relative;
  transition: all 0.2s ease;
}
.process-step:hover {
  border-color: var(--navy-300);
  box-shadow: 0 12px 32px -12px rgba(15,42,71,0.15);
  transform: translateY(-3px);
}
.process-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563EB 0%, #1E3A8A 100%);
  color: white;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 18px;
  box-shadow: 0 6px 16px -4px rgba(37, 99, 235, 0.4);
}
.process-step h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 10px;
}
.process-step p {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--gray-600);
}
.process-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy-600);
  font-size: 22px;
  font-weight: 400;
}

/* ---------- 合作模式（三栏套餐）---------- */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.plan-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 32px;
  position: relative;
  transition: border-color 0.15s;
}
.plan-card:hover { border-color: var(--gray-400); }
.plan-card.featured {
  border-color: var(--navy-800);
  border-width: 2px;
  background: var(--gray-25);
}
.plan-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -10px; left: 32px;
  background: var(--navy-800);
  color: white;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}
.plan-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--navy-700);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.plan-card h3 { font-size: 22px; margin-bottom: 8px; }
.plan-desc { font-size: 14px; color: var(--gray-600); margin-bottom: 24px; }
.plan-price {
  padding: 16px 0;
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: 24px;
}
.plan-price-amount {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--navy-900);
}
.plan-price-unit {
  font-size: 14px;
  color: var(--gray-500);
  font-weight: 400;
  margin-left: 4px;
}
.plan-features {
  display: flex; flex-direction: column; gap: 12px;
  margin-bottom: 28px;
}
.plan-features li {
  display: flex; gap: 10px;
  font-size: 14px;
  align-items: flex-start;
}
.plan-features li::before {
  content: '✓';
  flex-shrink: 0;
  color: var(--navy-700);
  font-weight: 700;
  margin-top: 1px;
}

/* ---------- 行业方案卡片 ---------- */
.plan-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* ---------- 行业方案 分栏布局（左图+右卡）---------- */
.industry-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}
.industry-layout .industry-hero {
  margin: 0;
  position: sticky;
  top: 96px;
}
.industry-layout .industry-hero img {
  width: 100%;
  height: auto;
  border-radius: 16px;
  display: block;
  box-shadow:
    0 1px 2px rgba(0,0,0,0.04),
    0 20px 50px -10px rgba(15,42,71,0.15);
}
.industry-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 14px;
  padding: 36px 32px;
  transition: all 0.2s;
}
.industry-card:hover {
  border-color: var(--navy-300);
  background: var(--gray-25);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px -12px rgba(15,42,71,0.15);
}
.industry-card-head {
  display: flex; align-items: center; gap: 16px;
  padding-bottom: 24px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--gray-100);
}
.industry-card-icon {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, #2563EB 0%, #1E3A8A 100%);
  color: white;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px -2px rgba(37, 99, 235, 0.4);
}
.industry-card-head h3 { font-size: 19px; font-weight: 600; margin-bottom: 4px; }
.industry-card-head .sub {
  font-size: 14px;
  color: var(--gray-600);
}
.industry-card-body ul li {
  display: flex; gap: 12px;
  font-size: 15px;
  line-height: 1.6;
  padding: 12px 0;
  border-bottom: 1px solid var(--gray-100);
  align-items: flex-start;
}
.industry-card-body ul li:last-child { border-bottom: none; }
.industry-card-body ul li::before {
  content: '✓';
  flex-shrink: 0;
  color: var(--navy-700);
  font-weight: 700;
  margin-top: 1px;
  font-size: 14px;
}

/* ---------- 联系方式卡 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
  max-width: 720px;
  margin: 0 auto;
}
.contact-card {
  background: var(--navy-900);
  color: white;
  border-radius: 12px;
  padding: 32px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--navy-800);
}
.contact-card::before {
  content: '';
  position: absolute;
  top: -40%; right: -20%;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(99,102,241,0.2) 0%, transparent 70%);
  pointer-events: none;
}
.contact-card > * { position: relative; }
.contact-card h3 { color: white; margin-bottom: 8px; font-size: 20px; }
.contact-card .contact-intro {
  color: var(--navy-200);
  font-size: 13px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.contact-info-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 14px;
}
.contact-info-item:first-of-type { border-top: none; padding-top: 0; }
.contact-info-item-label {
  color: var(--navy-300);
  font-size: 13px;
}
.contact-info-item-value {
  color: white;
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 13px;
}

/* ---------- 表单 ---------- */
.form-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 32px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
}
.form-field label .req { color: var(--danger); }
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  color: var(--gray-900);
  background: white;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--navy-500);
  box-shadow: 0 0 0 3px rgba(42, 74, 115, 0.1);
}
.form-field textarea { resize: vertical; min-height: 100px; }
.form-card .btn { width: 100%; margin-top: 8px; }
.form-note {
  font-size: 12px;
  color: var(--gray-400);
  margin-top: 12px;
  text-align: center;
}

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border-top: 1px solid var(--gray-200);
}
.faq-item:last-child { border-bottom: 1px solid var(--gray-200); }
.faq-q {
  width: 100%;
  padding: 22px 0;
  background: none;
  border: none;
  text-align: left;
  font-size: 17px;
  font-weight: 500;
  color: var(--gray-900);
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
  transition: color 0.15s;
}
.faq-q:hover { color: var(--navy-800); }
.faq-q::after {
  content: '+';
  font-size: 24px;
  color: var(--gray-400);
  font-weight: 300;
  transition: transform 0.2s, color 0.2s;
  flex-shrink: 0;
}
.faq-item.open .faq-q::after { transform: rotate(45deg); color: var(--navy-700); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s, padding 0.3s;
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray-600);
}
.faq-item.open .faq-a {
  max-height: 400px;
  padding-bottom: 22px;
}

/* ---------- Footer ---------- */
footer {
  background: var(--navy-900);
  color: var(--navy-300);
  padding: 64px 0 28px;
}
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-brand .logo { color: white; margin-bottom: 16px; }
.footer-brand p {
  color: var(--navy-300);
  font-size: 14px;
  max-width: 320px;
  line-height: 1.6;
}
.footer-col h5 {
  color: white;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}
.footer-col ul li { margin-bottom: 12px; font-size: 14px; }
.footer-col ul li a:hover { color: white; }
.footer-bottom {
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--navy-300);
}
.footer-bottom a {
  color: var(--navy-300);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-bottom a:hover {
  color: white;
  text-decoration: underline;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  h1 { font-size: 38px; }
  h2 { font-size: 30px; }
  .nav-menu { display: none; }
  .hero { padding: 64px 0 80px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .feature-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; gap: 48px; }
  .plan-grid { grid-template-columns: 1fr; }
  .industry-layout { grid-template-columns: 1fr; gap: 32px; }
  .industry-layout .industry-hero { position: static; }
  .plans-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .timeline-item { grid-template-columns: 1fr; gap: 8px; }
  .history-timeline::before { left: 16px; }
  .history-item { grid-template-columns: 36px 1fr; gap: 20px; }
  .history-marker { text-align: left; padding-top: 18px; font-size: 13px; }
  .history-marker::before { right: auto; left: -22px; }
  .history-content { padding: 20px; }
  .history-content::before { display: none; }
  .process-grid { grid-template-columns: 1fr; gap: 12px; }
  .process-arrow { transform: rotate(90deg); padding: 4px 0; }
  .industry-hero { margin-bottom: 40px; }
  section { padding: 72px 0; }
  .dashboard-row { grid-template-columns: 1fr; }
}