/* ============================================================
   帮主干活AI超市 - 官网样式
   配色：深蓝紫科技底 + 渐变品牌色 + 橙色活力点缀
   ============================================================ */

/* ===== 全局变量 ===== */
:root {
  --bg: #ffffff;
  --bg-soft: #f0fdfa;
  --bg-dark: #0f172a;
  --bg-dark-2: #1e293b;

  --text: #0f172a;
  --text-2: #475569;
  --text-muted: #94a3b8;
  --text-light: #ffffff;
  --text-light-muted: rgba(255,255,255,0.7);

  --primary: #0d9488;
  --primary-dark: #0f766e;
  --accent: #f97316;
  --accent-2: #0ea5e9;
  --accent-warm: #fb923c;
  --accent-green: #10b981;

  --gradient: linear-gradient(135deg, #0d9488 0%, #0ea5e9 100%);
  --gradient-warm: linear-gradient(135deg, #f97316 0%, #fb923c 100%);
  --gradient-cool: linear-gradient(135deg, #0ea5e9 0%, #0d9488 100%);
  --gradient-text: linear-gradient(135deg, #14b8a6 0%, #0ea5e9 50%, #fbbf24 100%);

  --card-bg: #ffffff;
  --card-shadow: 0 4px 20px rgba(13, 148, 136, 0.06);
  --card-shadow-hover: 0 12px 40px rgba(13, 148, 136, 0.15);
  --border: rgba(15, 23, 42, 0.08);

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --container: 1200px;
  --header-h: 72px;

  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ===== 重置 ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 600; white-space: nowrap;
  transition: all 0.3s var(--ease); cursor: pointer;
}
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: 10px; }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-block { width: 100%; }
.btn-primary {
  background: var(--gradient); color: #fff;
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(13, 148, 136, 0.45); }
.btn-ghost { color: var(--primary); border: 1.5px solid rgba(13, 148, 136,0.2); background: rgba(13, 148, 136,0.04); }
.btn-ghost:hover { background: rgba(13, 148, 136,0.1); border-color: var(--primary); }
.btn-outline { color: var(--text); border: 1.5px solid var(--border); background: rgba(255,255,255,0.6); backdrop-filter: blur(8px); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-outline-light { color: #fff; border: 1.5px solid rgba(255,255,255,0.4); background: rgba(255,255,255,0.08); backdrop-filter: blur(8px); }
.btn-outline-light:hover { background: rgba(255,255,255,0.18); border-color: rgba(255,255,255,0.7); }
.btn-arrow { transition: transform 0.3s var(--ease); }
.btn:hover .btn-arrow { transform: translateX(4px); }

/* ===== 导航 ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: all 0.3s var(--ease);
}
.header.scrolled {
  background: rgba(255,255,255,0.95);
  border-bottom-color: var(--border);
  box-shadow: 0 2px 20px rgba(0,0,0,0.04);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; }
.logo-icon { font-size: 26px; filter: drop-shadow(0 2px 4px rgba(13, 148, 136,0.3)); }
.logo-text { display: flex; align-items: baseline; gap: 4px; }
.logo-text small { font-size: 12px; font-weight: 600; color: var(--primary); background: rgba(13, 148, 136,0.1); padding: 2px 6px; border-radius: 4px; }
.nav { display: flex; gap: 8px; }
.nav-link {
  padding: 8px 16px; border-radius: 8px; font-size: 16px; font-weight: 600;
  color: var(--text-2); transition: all 0.25s var(--ease); position: relative;
  line-height: 1.2;
}
.nav-link:hover { color: var(--primary); background: rgba(13, 148, 136,0.06); }
.nav-link.active { color: var(--primary); }
.nav-link.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 20px; height: 3px; border-radius: 2px; background: var(--gradient);
}
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.nav-toggle span { width: 24px; height: 2.5px; background: var(--text); border-radius: 2px; transition: all 0.3s var(--ease); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ===== 导航下拉菜单 ===== */
.nav-dropdown { position: relative; display: flex; align-items: center; }
.nav-dropdown > .nav-link { display: inline-flex; align-items: center; line-height: 1; }
.nav-dropdown .caret { font-size: 11px; margin-left: 3px; transition: transform 0.25s var(--ease); display: inline-block; line-height: 1; }
.nav-dropdown:hover .caret { transform: rotate(180deg); }
.dropdown-menu {
  position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%) translateY(10px);
  min-width: 300px; background: #fff; border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(0,0,0,0.12); border: 1px solid var(--border);
  padding: 12px; opacity: 0; visibility: hidden;
  transition: all 0.3s var(--ease); z-index: 100;
}
.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.dropdown-item { display: flex; align-items: center; gap: 14px; padding: 12px 14px; border-radius: 10px; transition: all 0.2s; }
.dropdown-item:hover { background: var(--bg-soft); }
.di-icon { font-size: 24px; flex-shrink: 0; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; border-radius: 12px; background: var(--bg-soft); }
.di-info { display: flex; flex-direction: column; }
.di-info strong { font-size: 15px; font-weight: 600; color: var(--text); }
.di-info small { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  padding-top: var(--header-h);
  background: var(--bg-dark);
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5;
  animation: float 12s ease-in-out infinite;
}
.orb-1 { width: 500px; height: 500px; background: #0d9488; top: -100px; left: -100px; }
.orb-2 { width: 400px; height: 400px; background: #0ea5e9; bottom: -50px; right: 10%; animation-delay: -4s; }
.orb-3 { width: 350px; height: 350px; background: #f97316; top: 30%; right: -80px; animation-delay: -8s; opacity: 0.3; }
@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.08); }
  66% { transform: translate(-30px, 40px) scale(0.95); }
}
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
}
.hero-content {
  position: relative; z-index: 1; color: #fff; padding: 60px 0;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center;
}
.hero-left { text-align: left; }
.hero-content .hero-badge { margin-left: 0; }
.hero-subtitle { margin-left: 0; }
.hero-tags { justify-content: flex-start; }
.hero-actions { justify-content: flex-start; }
.hero-stats { justify-content: flex-start; margin: 0; }
.hero-right { display: flex; align-items: center; justify-content: center; }
.hero-illustration { width: 100%; max-width: 560px; height: auto; filter: drop-shadow(0 20px 40px rgba(2, 132, 199, 0.25)); }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 30px; font-size: 14px; font-weight: 500;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(8px); margin-bottom: 28px;
  animation: fadeUp 0.8s var(--ease-out) both;
}
.hero-title {
  font-size: clamp(36px, 6vw, 68px); font-weight: 800; line-height: 1.15;
  letter-spacing: -1px; margin-bottom: 24px;
  animation: fadeUp 0.8s var(--ease-out) 0.1s both;
}
.gradient-text {
  background: var(--gradient-text); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px); color: var(--text-light-muted);
  max-width: 640px; margin: 0 auto 32px; line-height: 1.7;
  animation: fadeUp 0.8s var(--ease-out) 0.2s both;
}
.hero-tags {
  display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 40px;
  animation: fadeUp 0.8s var(--ease-out) 0.3s both;
}
.hero-tags .tag {
  padding: 6px 16px; border-radius: 20px; font-size: 14px; font-weight: 600;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
}
.tag-dot { color: rgba(255,255,255,0.3); }
.hero-actions {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 64px;
  animation: fadeUp 0.8s var(--ease-out) 0.4s both;
}
.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 0; flex-wrap: wrap;
  max-width: 700px; margin: 0 auto;
  animation: fadeUp 0.8s var(--ease-out) 0.5s both;
}
.stat-item { flex: 1; min-width: 120px; text-align: center; padding: 0 16px; }
.stat-num {
  font-size: clamp(28px, 4vw, 42px); font-weight: 800;
  background: var(--gradient-text); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
  line-height: 1.2;
}
.stat-label { font-size: 14px; color: var(--text-light-muted); margin-top: 4px; }
.stat-divider { width: 1px; height: 40px; background: rgba(255,255,255,0.12); }
.scroll-hint {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  z-index: 1; text-align: center; color: var(--text-light-muted); font-size: 13px;
}
.scroll-mouse {
  width: 24px; height: 40px; border: 2px solid rgba(255,255,255,0.3);
  border-radius: 14px; margin: 8px auto 0; position: relative;
}
.scroll-dot {
  width: 4px; height: 8px; background: #fff; border-radius: 2px;
  position: absolute; top: 8px; left: 50%; transform: translateX(-50%);
  animation: scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot {
  0% { opacity: 0; transform: translate(-50%, 0); }
  40% { opacity: 1; }
  80% { opacity: 0; transform: translate(-50%, 14px); }
  100% { opacity: 0; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 通用 Section ===== */
.section { padding: 100px 0; }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 64px; }
.section-eyebrow {
  font-size: 13px; font-weight: 700; letter-spacing: 3px; color: var(--primary);
  margin-bottom: 12px; opacity: 0.8;
}
.section-title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -0.5px; margin-bottom: 16px; }
.section-desc { font-size: 17px; color: var(--text-muted); }

/* ===== 产品服务 ===== */
.products { background: var(--bg-soft); }
.products-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.product-card {
  background: var(--card-bg); border-radius: var(--radius-lg);
  padding: 36px 32px; border: 1px solid var(--border);
  box-shadow: var(--card-shadow); transition: all 0.4s var(--ease);
  position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--accent); opacity: 0; transition: opacity 0.4s var(--ease);
}
.product-card:hover {
  transform: translateY(-8px); box-shadow: var(--card-shadow-hover);
  border-color: transparent;
}
.product-card:hover::before { opacity: 1; }
.product-icon {
  width: 64px; height: 64px; border-radius: 16px; margin-bottom: 20px;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.product-icon svg { width: 36px; height: 36px; }
.product-tag {
  display: inline-block; font-size: 12px; font-weight: 600; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  padding: 4px 10px; border-radius: 6px; margin-bottom: 12px;
}
.product-name { font-size: 22px; font-weight: 700; margin-bottom: 12px; }
.product-desc { font-size: 15px; color: var(--text-2); line-height: 1.7; margin-bottom: 20px; }
.product-features { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.product-features span {
  font-size: 13px; color: var(--text-muted); padding: 4px 12px;
  background: var(--bg-soft); border-radius: 6px;
}
.product-actions { display: flex; gap: 20px; }
.link-btn {
  font-size: 15px; font-weight: 600; color: var(--accent);
  transition: gap 0.3s var(--ease); padding: 0;
}
.link-btn:hover { opacity: 0.8; }
.link-btn.muted { color: var(--text-muted); font-weight: 500; }

/* ===== 核心优势 ===== */
.advantages { background: var(--bg); }
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.advantage-card {
  text-align: center; padding: 40px 24px; border-radius: var(--radius-lg);
  background: var(--bg-soft); border: 1px solid transparent;
  transition: all 0.4s var(--ease);
}
.advantage-card:hover {
  background: #fff; border-color: var(--border); box-shadow: var(--card-shadow-hover);
  transform: translateY(-4px);
}
.adv-icon {
  width: 72px; height: 72px; border-radius: 20px; margin: 0 auto 24px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(13, 148, 136,0.2);
}
.adv-icon svg { width: 36px; height: 36px; }
.advantage-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.advantage-card p { font-size: 15px; color: var(--text-2); line-height: 1.7; }

/* ===== 服务案例 ===== */
.cases { background: var(--bg-soft); }
.cases-list { display: flex; flex-direction: column; gap: 32px; }
.case-card {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  background: #fff; border-radius: var(--radius-xl); overflow: hidden;
  box-shadow: var(--card-shadow); border: 1px solid var(--border);
  transition: all 0.4s var(--ease);
}
.case-card:hover { box-shadow: var(--card-shadow-hover); transform: translateY(-4px); }
.case-card.reverse .case-visual { order: 2; }
.case-visual {
  padding: 48px; display: flex; flex-direction: column; justify-content: center;
  align-items: center; gap: 28px; min-height: 280px;
}
.case-emoji { font-size: 64px; }
.case-data { display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; }
.case-metric { text-align: center; }
.case-metric strong {
  display: block; font-size: 32px; font-weight: 800;
  background: var(--gradient); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent;
}
.case-metric span { font-size: 13px; color: var(--text-muted); margin-top: 4px; display: block; }
.case-body { padding: 48px; display: flex; flex-direction: column; justify-content: center; }
.case-industry { font-size: 14px; color: var(--primary); font-weight: 600; margin-bottom: 12px; }
.case-body h3 { font-size: 24px; font-weight: 700; margin-bottom: 16px; line-height: 1.4; }
.case-body p { font-size: 15px; color: var(--text-2); line-height: 1.8; margin-bottom: 24px; }
.cases-more { text-align: center; margin-top: 48px; }

/* ===== 客户墙 ===== */
.clients { background: var(--bg); padding: 80px 0; }
.clients-marquee { overflow: hidden; position: relative; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee-track { display: flex; gap: 24px; width: max-content; animation: marquee 30s linear infinite; }
.clients-marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.client-logo {
  flex-shrink: 0; padding: 20px 36px; border-radius: var(--radius);
  background: var(--bg-soft); border: 1px solid var(--border);
  font-size: 18px; font-weight: 700; color: var(--text-2);
  display: flex; align-items: center; justify-content: center; min-width: 160px;
  transition: all 0.3s var(--ease);
}
.client-logo:hover { color: var(--primary); border-color: var(--primary); background: rgba(13, 148, 136,0.04); }

/* ===== CTA ===== */
.cta-section { padding: 80px 0; background: var(--bg-soft); }
.cta-box {
  position: relative; border-radius: var(--radius-xl); overflow: hidden;
  background: var(--bg-dark); padding: 80px 40px; text-align: center;
}
.cta-bg { position: absolute; inset: 0; z-index: 0; }
.cta-bg .orb { opacity: 0.4; }
.cta-bg .orb-1 { width: 400px; height: 400px; background: #0d9488; top: -120px; left: 10%; }
.cta-bg .orb-2 { width: 350px; height: 350px; background: #0ea5e9; bottom: -120px; right: 10%; animation-delay: -6s; }
.cta-content { position: relative; z-index: 1; }
.cta-title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: #fff; margin-bottom: 16px; }
.cta-desc { font-size: 17px; color: var(--text-light-muted); margin-bottom: 36px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 36px; }
.cta-contact { display: flex; gap: 32px; justify-content: center; flex-wrap: wrap; color: var(--text-light-muted); font-size: 15px; }

/* ===== 页脚 ===== */
.footer { background: var(--bg-dark); color: var(--text-light-muted); padding: 64px 0 32px; }
.footer .logo { color: #fff; margin-bottom: 16px; }
.footer-slogan { font-size: 14px; line-height: 1.8; margin-bottom: 24px; }
.footer-social { display: flex; gap: 12px; }
.social-link {
  width: 40px; height: 40px; border-radius: 10px; display: flex;
  align-items: center; justify-content: center; font-size: 18px;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.08);
  transition: all 0.3s var(--ease);
}
.social-link:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 48px;
}
.footer-col h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 20px; }
.footer-col a, .footer-col p { display: block; font-size: 14px; line-height: 2.2; color: var(--text-light-muted); transition: color 0.25s; }
.footer-col a:hover { color: #fff; }
.footer-contact { line-height: 1.8 !important; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: 13px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a:hover { color: #fff; }

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(10, 14, 39, 0.6); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; visibility: hidden; transition: all 0.3s var(--ease);
}
.modal-overlay.show { opacity: 1; visibility: visible; }
.modal {
  background: #fff; border-radius: var(--radius-xl); width: 100%; max-width: 560px;
  max-height: 90vh; overflow-y: auto; padding: 40px; position: relative;
  transform: translateY(30px) scale(0.96); transition: transform 0.4s var(--ease-out);
  box-shadow: 0 24px 80px rgba(0,0,0,0.2);
}
.modal-overlay.show .modal { transform: translateY(0) scale(1); }
.modal-close {
  position: absolute; top: 16px; right: 16px; width: 36px; height: 36px;
  border-radius: 50%; font-size: 22px; color: var(--text-muted);
  background: var(--bg-soft); display: flex; align-items: center; justify-content: center;
  transition: all 0.25s;
}
.modal-close:hover { background: var(--accent); color: #fff; transform: rotate(90deg); }
.modal-head { margin-bottom: 28px; }
.modal-head h3 { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.modal-head p { font-size: 15px; color: var(--text-muted); }
.consult-form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.req { color: var(--accent); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); font-size: 15px; font-family: inherit;
  color: var(--text); background: var(--bg-soft); transition: all 0.25s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); background: #fff;
  box-shadow: 0 0 0 4px rgba(13, 148, 136,0.08);
}
.form-group textarea { resize: vertical; }
.form-tip {
  display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-muted);
  margin-bottom: 20px; padding: 10px 14px; background: var(--bg-soft); border-radius: var(--radius-sm);
}
.form-success {
  margin-top: 16px; padding: 14px; text-align: center; border-radius: var(--radius-sm);
  background: rgba(16, 185, 129,0.1); color: #047857; font-weight: 600; font-size: 15px;
}
#submitBtn.loading { opacity: 0.7; pointer-events: none; }
#submitBtn.loading::after {
  content: ''; display: inline-block; width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.3); border-top-color: #fff;
  border-radius: 50%; animation: spin 0.6s linear infinite; margin-left: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 回到顶部 ===== */
.back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 90;
  width: 48px; height: 48px; border-radius: 14px; font-size: 22px;
  background: var(--gradient); color: #fff;
  box-shadow: 0 8px 24px rgba(13, 148, 136,0.3);
  opacity: 0; visibility: hidden; transform: translateY(20px);
  transition: all 0.3s var(--ease);
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { transform: translateY(-4px); }

/* ===== 滚动揭示动画 ===== */
.reveal { opacity: 0; transform: translateY(40px); transition: all 0.7s var(--ease-out); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== 子页面通用 ===== */
.page-banner {
  position: relative; padding: calc(var(--header-h) + 60px) 0 56px;
  background: var(--bg-dark); color: #fff; overflow: hidden; text-align: center;
}
.page-banner .orb { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.4; }
.page-banner .orb-1 { width: 380px; height: 380px; background: #0d9488; top: -120px; left: 5%; }
.page-banner .orb-2 { width: 320px; height: 320px; background: #0ea5e9; bottom: -120px; right: 5%; }
.page-banner .banner-content { position: relative; z-index: 1; }
.page-banner h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; margin-bottom: 14px; }
.page-banner .banner-desc { font-size: 17px; color: var(--text-light-muted); max-width: 620px; margin: 0 auto; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--text-muted); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--text-muted); opacity: 0.5; }
.breadcrumb .current { color: var(--text); font-weight: 500; }

/* ===== 产品总览页 ===== */
.products-page .products-grid { margin-bottom: 60px; }

/* ===== 产品详情页 ===== */
.product-detail-hero { padding: 60px 0; }
.product-detail-hero .pd-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.pd-icon-box { width: 100%; aspect-ratio: 1; max-width: 360px; border-radius: var(--radius-xl); display: flex; align-items: center; justify-content: center; margin: 0 auto; }
.pd-icon-box svg { width: 50%; height: 50%; }
.pd-tag { display: inline-block; font-size: 13px; font-weight: 600; padding: 5px 12px; border-radius: 6px; margin-bottom: 14px; }
.pd-title { font-size: clamp(26px, 3.5vw, 36px); font-weight: 800; margin-bottom: 16px; }
.pd-desc { font-size: 17px; color: var(--text-2); line-height: 1.8; margin-bottom: 24px; }
.pd-features { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
.pd-features span { font-size: 14px; padding: 6px 14px; border-radius: 8px; font-weight: 500; }
.pd-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.pd-section { padding: 60px 0; }
.pd-section.alt { background: var(--bg-soft); }
.pd-section-head { text-align: center; margin-bottom: 48px; }
.pd-section-head h2 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.pd-benefits { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pd-benefit-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px 28px; text-align: center; transition: all 0.3s var(--ease); }
.pd-benefit-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); }
.pd-benefit-card .num { font-size: 40px; font-weight: 800; margin-bottom: 12px; }
.pd-benefit-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.pd-benefit-card p { font-size: 15px; color: var(--text-2); line-height: 1.7; }
.pd-scenarios { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.pd-scenario { padding: 12px 24px; border-radius: var(--radius); background: var(--bg-soft); border: 1px solid var(--border); font-size: 15px; font-weight: 500; transition: all 0.25s; }
.pd-scenario:hover { border-color: var(--primary); color: var(--primary); }

/* ===== 案例页 ===== */
.case-filter { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px; }
.filter-btn { padding: 8px 20px; border-radius: 20px; font-size: 14px; font-weight: 500; border: 1.5px solid var(--border); background: #fff; color: var(--text-2); transition: all 0.25s; }
.filter-btn:hover, .filter-btn.active { background: var(--gradient); color: #fff; border-color: transparent; }
.case-list-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.case-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--card-shadow); transition: all 0.3s var(--ease); cursor: pointer; }
.case-item:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); }
.case-item-visual { padding: 36px; text-align: center; }
.case-item-emoji { font-size: 52px; margin-bottom: 16px; }
.case-item-industry { font-size: 14px; color: var(--primary); font-weight: 600; }
.case-item-body { padding: 28px; }
.case-item-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.case-item-body p { font-size: 14px; color: var(--text-2); line-height: 1.7; margin-bottom: 16px; }
.case-item-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.case-item-tags span { font-size: 12px; padding: 3px 10px; border-radius: 6px; background: var(--bg-soft); color: var(--text-muted); }

/* ===== 解决方案页 ===== */
.solution-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.solution-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px 24px; text-align: center; transition: all 0.3s var(--ease); }
.solution-card:hover { transform: translateY(-4px); box-shadow: var(--card-shadow-hover); border-color: transparent; }
.solution-emoji { font-size: 48px; margin-bottom: 16px; }
.solution-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.solution-card p { font-size: 14px; color: var(--text-2); line-height: 1.6; margin-bottom: 16px; }
.solution-products { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }
.solution-products span { font-size: 12px; padding: 3px 10px; border-radius: 6px; background: rgba(13, 148, 136,0.08); color: var(--primary); }

/* ===== 关于我们 ===== */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-intro-text h2 { font-size: 28px; font-weight: 800; margin-bottom: 20px; }
.about-intro-text p { font-size: 16px; color: var(--text-2); line-height: 1.9; margin-bottom: 16px; }
.about-intro-visual { aspect-ratio: 4/3; border-radius: var(--radius-xl); display: flex; align-items: center; justify-content: center; font-size: 120px; }
.about-values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.value-card { text-align: center; padding: 36px 24px; border-radius: var(--radius-lg); background: var(--bg-soft); }
.value-card .icon { font-size: 48px; margin-bottom: 16px; }
.value-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.value-card p { font-size: 15px; color: var(--text-2); line-height: 1.7; }
.about-milestone { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.milestone-item { text-align: center; }
.milestone-num { font-size: 36px; font-weight: 800; margin-bottom: 8px; }
.milestone-label { font-size: 14px; color: var(--text-muted); }

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.contact-info-list { display: flex; flex-direction: column; gap: 24px; }
.contact-info-item { display: flex; gap: 16px; align-items: flex-start; padding: 24px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: #fff; }
.contact-info-item .icon { font-size: 28px; flex-shrink: 0; }
.contact-info-item h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.contact-info-item p { font-size: 15px; color: var(--text-2); }
.contact-form-box { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 40px; box-shadow: var(--card-shadow); }
.contact-form-box h3 { font-size: 22px; font-weight: 700; margin-bottom: 24px; }

/* ===== 响应式 ===== */
/* 大屏微调 */
@media (max-width: 1280px) {
  :root { --container: 1100px; }
}
/* 平板横屏 */
@media (max-width: 1024px) {
  :root { --container: 920px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; gap: 32px; }
  .section { padding: 80px 0; }
  .section-head { margin-bottom: 48px; }
  .case-body, .case-visual { padding: 36px 32px; }
}
/* 小平板：汉堡菜单 + 案例单列 */
@media (max-width: 992px) {
  :root { --header-h: 64px; }
  .nav { display: none; }
  .nav-toggle { display: flex; }
  .nav-actions .btn-ghost { display: none; }
  .nav.open {
    display: flex; flex-direction: column; position: absolute;
    top: var(--header-h); left: 0; right: 0; background: #fff;
    padding: 12px 20px; gap: 2px; box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    border-top: 1px solid var(--border); max-height: 80vh; overflow-y: auto;
  }
  .nav.open .nav-link { padding: 12px 14px; }
  .dropdown-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; padding: 0 0 0 20px; min-width: auto; background: transparent; }
  .nav-dropdown .caret { display: none; }
  .dropdown-item { padding: 10px 14px; }
  .di-icon { width: 36px; height: 36px; font-size: 20px; }
  .case-card { grid-template-columns: 1fr; }
  .case-card.reverse .case-visual { order: 0; }
  .case-data { gap: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-box { padding: 60px 28px; }
}
/* 手机 */
@media (max-width: 768px) {
  :root { --header-h: 56px; }
  .nav-actions .btn-primary { display: none; }
  .nav-actions { gap: 8px; }
  .logo { font-size: 18px; }
  .logo-icon { font-size: 22px; }
  .container { padding: 0 20px; }
  .section { padding: 56px 0; }
  .section-head { margin-bottom: 40px; }
  .section-title { font-size: 26px; }
  .hero { min-height: auto; padding-top: calc(var(--header-h) + 40px); padding-bottom: 60px; }
  .hero-content { padding: 32px 0; }
  .hero-badge { font-size: 13px; padding: 6px 14px; margin-bottom: 20px; }
  .hero-title { font-size: clamp(28px, 8vw, 38px); }
  .hero-subtitle { font-size: 15px; margin-bottom: 24px; }
  .hero-tags { gap: 8px; margin-bottom: 32px; }
  .hero-tags .tag { padding: 5px 12px; font-size: 13px; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 12px; margin-bottom: 48px; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { gap: 12px; }
  .stat-item { min-width: 70px; padding: 0 6px; }
  .stat-num { font-size: 24px; }
  .stat-label { font-size: 12px; }
  .stat-divider { display: none; }
  .scroll-hint { display: none; }
  .products-grid { grid-template-columns: 1fr; }
  .product-card { padding: 28px 24px; }
  .advantages-grid { grid-template-columns: 1fr; }
  .advantage-card { padding: 32px 20px; }
  .case-visual, .case-body { padding: 32px 24px; }
  .case-emoji { font-size: 48px; }
  .case-data { gap: 20px; }
  .case-metric strong { font-size: 26px; }
  .case-body h3 { font-size: 20px; }
  .consult-form .form-row { grid-template-columns: 1fr; gap: 0; }
  .cta-contact { flex-direction: column; gap: 12px; }
  .footer-bottom { flex-direction: column; text-align: center; gap: 8px; }
  .back-top { bottom: 20px; right: 20px; width: 44px; height: 44px; }
  .modal { padding: 32px 24px; max-width: 100%; border-radius: 20px; }
  /* 子页面响应式 */
  .pd-wrap { grid-template-columns: 1fr; gap: 32px; }
  .pd-benefits { grid-template-columns: 1fr; }
  .about-intro { grid-template-columns: 1fr; gap: 32px; }
  .about-values { grid-template-columns: 1fr; }
  .about-milestone { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .case-list-grid { grid-template-columns: 1fr; }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
}
/* 小手机 */
@media (max-width: 576px) {
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 22px; }
  .hero-title { font-size: 26px; }
  .product-card { padding: 24px 20px; }
  .product-name { font-size: 20px; }
  .case-visual, .case-body { padding: 28px 20px; }
  .case-data { gap: 16px; }
  .cta-box { padding: 48px 20px; }
  .cta-title { font-size: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .modal { padding: 28px 20px; border-radius: 16px; }
  .modal-head h3 { font-size: 20px; }
}
/* 超小屏 */
@media (max-width: 380px) {
  .hero-title { font-size: 24px; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
}

/* ===== 图片素材样式 ===== */
/* 产品卡缩略图 */
.product-thumb {
  margin-bottom: 20px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  aspect-ratio: 4 / 3;
  display: flex; align-items: center; justify-content: center;
}
.product-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.product-card:hover .product-thumb img { transform: scale(1.05); }

/* 案例视觉配图（首页/cases） */
.case-visual--img { padding: 0; overflow: hidden; }
.case-visual--img img { width: 100%; height: 100%; min-height: 280px; object-fit: cover; display: block; }
.case-visual--img .case-data {
  position: absolute; left: 0; right: 0; bottom: 0;
  display: flex; gap: 16px; padding: 24px 32px;
  background: linear-gradient(to top, rgba(15,23,42,0.72), transparent);
}
.case-visual { position: relative; }

/* 产品详情页案例配图 */
.case-item-visual--img { padding: 0; }
.case-item-visual--img img {
  width: 100%; height: 100%; min-height: 200px; object-fit: cover; display: block;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.case-item-visual--img .case-item-industry {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 16px 24px; color: #fff; font-weight: 700; font-size: 15px;
  background: linear-gradient(to top, rgba(15,23,42,0.7), transparent);
}
.case-item-visual { position: relative; overflow: hidden; }

/* 关于页团队配图 */
.about-intro-visual--img { padding: 0; overflow: hidden; }
.about-intro-visual--img img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* 客户墙 logo 图片 */
.client-logo { display: flex; align-items: center; justify-content: center; }
.client-logo img { height: 40px; width: auto; display: block; opacity: 0.85; transition: opacity 0.3s, transform 0.3s; }
.client-logo:hover img { opacity: 1; transform: scale(1.05); }

/* 响应式：hero 窄屏堆叠 */
@media (max-width: 992px) {
  .hero-content { grid-template-columns: 1fr; gap: 32px; text-align: center; }
  .hero-left { text-align: center; }
  .hero-content .hero-badge,
  .hero-subtitle,
  .hero-tags,
  .hero-actions,
  .hero-stats { margin-left: auto; margin-right: auto; justify-content: center; }
  .hero-right { order: -1; }
  .hero-illustration { max-width: 420px; }
}
@media (max-width: 576px) {
  .hero-illustration { max-width: 320px; }
  .case-visual--img .case-data { flex-direction: column; gap: 8px; padding: 16px 20px; }
}