/* ============================================================
   Infosoo - Global Styles
   Brand: #0057FF (primary blue), #00C6B8 (accent teal)
   Design inspired by Feishu.cn
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --primary: #0057FF;
  --primary-dark: #003ECB;
  --primary-light: #EBF0FF;
  --accent: #00C6B8;
  --accent-dark: #009E93;
  --text-primary: #1A1A2E;
  --text-secondary: #4A5568;
  --text-muted: #718096;
  --bg-white: #FFFFFF;
  --bg-light: #F7F9FC;
  --bg-dark: #0E1225;
  --border: #E2E8F0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.14);
  --radius: 12px;
  --radius-lg: 20px;
  --font: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --nav-height: 68px;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font-family: var(--font); }

/* ---------- Typography ---------- */
.hero-title { font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 800; line-height: 1.2; letter-spacing: -0.02em; }
.section-title { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 700; line-height: 1.3; }
.section-subtitle { font-size: 1.05rem; color: var(--text-secondary); margin-top: 0.75rem; max-width: 560px; }
.label { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--primary); }

/* ---------- Navigation (Mega Menu - 赛邮风格) ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226,232,240,0.5);
  transition: box-shadow var(--transition), background var(--transition);
}
.nav.scrolled { box-shadow: 0 2px 24px rgba(0,0,0,0.08); }
.nav-inner {
  max-width: 1320px; margin: 0 auto;
  display: flex; align-items: center; height: 100%;
  padding: 0 1.5rem; gap: 0;
}
.nav-logo {
  display: flex; align-items: center; gap: 0.6rem;
  font-size: 1.5rem; font-weight: 800; color: var(--primary);
  flex-shrink: 0; margin-right: 3rem;
}
.nav-logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 1rem; font-weight: 900;
}
.nav-menu {
  display: flex; align-items: center; gap: 0; flex: 1;
}
.nav-item {
  position: relative;
}
.nav-link {
  display: flex; align-items: center; gap: 0.35rem;
  padding: 0 1.1rem; height: var(--nav-height);
  font-size: 0.93rem; font-weight: 500; color: var(--text-primary);
  transition: color var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active { color: var(--primary); }
.nav-link svg { transition: transform var(--transition); width: 14px; height: 14px; }
.nav-item:hover .nav-link svg { transform: rotate(180deg); }

/* Mega Menu Dropdown (赛邮风格大面板下拉) */
.nav-dropdown {
  position: absolute; top: calc(100%); left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: white; border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.06);
  padding: 1.5rem 2rem;
  min-width: 640px; max-width: 800px;
  opacity: 0; visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  pointer-events: none;
  border: 1px solid rgba(226,232,240,0.6);
}
.nav-item:hover .nav-dropdown {
  opacity: 1; visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.mega-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.25rem 2rem;
}
.mega-group-title {
  grid-column: 1 / -1;
  font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 0.5rem;
}
.mega-item {
  display: flex; align-items: center; gap: 0.65rem;
  padding: 0.6rem 0.65rem; border-radius: 10px;
  font-size: 0.88rem; color: var(--text-primary);
  transition: all var(--transition);
  text-decoration: none !important;
}
.mega-item:hover { background: var(--bg-light); color: var(--primary); }
.mega-item-icon {
  width: 34px; height: 34px; flex-shrink: 0;
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-size: 0.95rem; background: var(--bg-light);
}
.mega-item:hover .mega-item-icon { background: var(--primary-light); color: white; }
.mega-item-text { display: flex; flex-direction: column; }
.mega-item-name { font-weight: 600; line-height: 1.35; }
.mega-item-desc { font-size: 0.76rem; color: var(--text-muted); line-height: 1.3; }

/* 小型普通下拉（用于非产品类菜单） */
.nav-dropdown-small {
  position: absolute; top: calc(100% - 4px); left: 0;
  background: white; border-radius: 12px;
  box-shadow: var(--shadow-lg); padding: 0.75rem;
  min-width: 200px; opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: all var(--transition); pointer-events: none;
  border: 1px solid rgba(226,232,240,0.6);
}
.nav-item:hover .nav-dropdown-small { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
.nav-dropdown-small a {
  display: block; padding: 0.55rem 0.9rem; border-radius: 8px;
  font-size: 0.87rem; color: var(--text-primary);
  transition: background var(--transition);
}
.nav-dropdown-small a:hover { background: var(--bg-light); color: var(--primary); }

/* 导航右侧CTA区域 */
.nav-actions { display: flex; align-items: center; gap: 0.6rem; margin-left: auto; flex-shrink: 0; }
.btn-ghost {
  padding: 0.5rem 1.25rem; border-radius: 8px;
  font-size: 0.88rem; font-weight: 500; color: var(--text-primary);
  transition: background var(--transition);
}
.btn-ghost:hover { background: var(--bg-light); }
.btn-primary {
  padding: 0.55rem 1.4rem; border-radius: 8px;
  background: var(--primary); color: white;
  font-size: 0.88rem; font-weight: 600;
  transition: background var(--transition), box-shadow var(--transition);
  box-shadow: 0 2px 8px rgba(0,87,255,0.3);
}
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 4px 16px rgba(0,87,255,0.4); }

/* 橙色CTA按钮 (营销转化主按钮) */
.btn-orange {
  padding: 0.55rem 1.4rem; border-radius: 8px;
  background: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
  color: white; font-size: 0.88rem; font-weight: 700;
  transition: all var(--transition);
  box-shadow: 0 2px 10px rgba(255,107,53,0.35);
}
.btn-orange:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(255,107,53,0.45);
}
.btn-outline {
  padding: 0.55rem 1.4rem; border-radius: 8px;
  border: 1.5px solid var(--primary); color: var(--primary);
  font-size: 0.88rem; font-weight: 600;
  transition: all var(--transition);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-lg {
  padding: 0.9rem 2.2rem; border-radius: 10px;
  font-size: 1rem; font-weight: 600;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh; padding-top: var(--nav-height);
  background: linear-gradient(135deg, #F0F4FF 0%, #EBF9F8 50%, #F0F4FF 100%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.hero-bg-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(0,87,255,0.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(0,87,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-blob {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.35;
  animation: blobFloat 8s ease-in-out infinite;
}
.hero-blob-1 { width: 500px; height: 500px; background: var(--primary); top: -100px; right: -100px; animation-delay: 0s; }
.hero-blob-2 { width: 400px; height: 400px; background: var(--accent); bottom: -100px; left: -50px; animation-delay: 3s; }
@keyframes blobFloat { 0%,100%{transform:translate(0,0) scale(1)} 50%{transform:translate(20px,-20px) scale(1.05)} }
.hero-content { position: relative; z-index: 1; text-align: center; padding: 4rem 2rem 2rem; max-width: 900px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: white; border: 1px solid var(--border);
  border-radius: 100px; padding: 0.4rem 1rem;
  font-size: 0.83rem; color: var(--text-secondary);
  margin-bottom: 1.5rem; box-shadow: var(--shadow-sm);
}
.hero-badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%,100%{transform:scale(1);opacity:1} 50%{transform:scale(1.4);opacity:0.6} }
.hero-title { margin-bottom: 1.25rem; }
.hero-title em { font-style: normal; color: var(--primary); }
.hero-desc {
  font-size: 1.1rem; color: var(--text-secondary); max-width: 620px; margin: 0 auto 2rem;
  line-height: 1.75;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2.5rem; }
.hero-stats {
  display: flex; gap: 3rem; justify-content: center; flex-wrap: wrap;
  margin-top: 1.5rem;
}
.hero-stat-num { font-size: 2rem; font-weight: 800; color: var(--primary); }
.hero-stat-label { font-size: 0.83rem; color: var(--text-muted); }
.hero-image { position: relative; z-index: 1; max-width: 1000px; margin: 0 auto; padding: 0 2rem; }
.hero-dashboard {
  background: white; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); border: 1px solid var(--border);
  overflow: hidden;
}
.hero-dashboard-bar {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1rem; background: #F7F9FC; border-bottom: 1px solid var(--border);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-red { background: #FF5F57; }
.dot-yellow { background: #FFBD2E; }
.dot-green { background: #27C93F; }

/* ---------- Section Layout ---------- */
.section { padding: 6rem 2rem; }
.section-narrow { padding: 4rem 2rem; }
.container { max-width: 1200px; margin: 0 auto; }
.container-lg { max-width: 1360px; margin: 0 auto; }
.section-head { text-align: center; margin-bottom: 3.5rem; }
.section-head .label { display: block; margin-bottom: 0.5rem; }
.section-head .section-subtitle { margin: 0.75rem auto 0; }

/* ---------- Product Cards ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.product-card {
  background: white; border-radius: var(--radius); border: 1px solid var(--border);
  padding: 2rem 1.75rem; transition: all var(--transition);
  cursor: pointer; position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0;
  height: 3px; background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transform-origin: left; transition: transform var(--transition);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.product-card:hover::before { transform: scaleX(1); }
.product-card-icon {
  width: 52px; height: 52px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.25rem; font-size: 1.5rem;
}
.product-card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.5rem; }
.product-card-desc { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.65; }
.product-card-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1rem; }
.tag {
  font-size: 0.75rem; padding: 0.2rem 0.65rem; border-radius: 100px;
  background: var(--bg-light); color: var(--text-secondary); font-weight: 500;
}
.tag-primary { background: var(--primary-light); color: var(--primary); }

/* ---------- Feature List ---------- */
.feature-list { display: grid; grid-template-columns: repeat(auto-fill,minmax(300px,1fr)); gap: 2rem; }
.feature-item { display: flex; gap: 1rem; }
.feature-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: var(--primary-light); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; color: var(--primary); font-size: 1.2rem;
}
.feature-title { font-weight: 600; font-size: 0.95rem; margin-bottom: 0.35rem; }
.feature-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* ---------- Stats Band ---------- */
.stats-band {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white; padding: 4rem 2rem;
}
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); gap: 2rem; text-align: center; }
.stat-num { font-size: 2.5rem; font-weight: 800; }
.stat-label { font-size: 0.9rem; opacity: 0.8; margin-top: 0.4rem; }

/* ---------- CTA Section (营销转化区) ---------- */
.cta-section {
  background: linear-gradient(135deg, #0E1225 0%, #1A2540 100%);
  color: white; text-align: center; padding: 6rem 2rem;
}
.cta-section .section-subtitle { color: rgba(255,255,255,0.65); margin: 0 auto; }
.cta-section .hero-title { color: white; margin-bottom: 1rem; }
.cta-section .hero-title em { color: var(--accent); }
.cta-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-top: 2rem; }

/* 底部极简注册表单 */
.register-form {
  max-width: 480px; margin: 2.5rem auto 0;
  display: flex; gap: 0.6rem;
}
.register-form input {
  flex: 1; min-width: 0;
  padding: 0.85rem 1.2rem; border-radius: 10px;
  border: 1.5px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.08);
  color: white; font-size: 0.9rem; font-family: var(--font);
  outline: none; transition: all var(--transition);
}
.register-form input::placeholder { color: rgba(255,255,255,0.4); }
.register-form input:focus { border-color: var(--accent); background: rgba(255,255,255,0.12); }
.register-form button {
  padding: 0.85rem 1.8rem; border-radius: 10px;
  background: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
  color: white; font-size: 0.9rem; font-weight: 700;
  border: none; cursor: pointer;
  transition: all var(--transition); font-family: var(--font);
  white-space: nowrap; box-shadow: 0 4px 16px rgba(255,107,53,0.3);
}
.register-form button:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,107,53,0.4); }
.register-benefits { display: flex; justify-content: center; gap: 2rem; margin-top: 1.25rem; flex-wrap: wrap; }
.register-benefit { display: flex; align-items: center; gap: 0.4rem; font-size: 0.83rem; color: rgba(255,255,255,0.55); }
.btn-white {
  padding: 0.9rem 2.2rem; border-radius: 10px;
  background: white; color: var(--primary);
  font-size: 1rem; font-weight: 600;
  transition: all var(--transition);
}
.btn-white:hover { background: #F0F4FF; box-shadow: 0 6px 20px rgba(255,255,255,0.2); }
.btn-outline-white {
  padding: 0.9rem 2.2rem; border-radius: 10px;
  border: 1.5px solid rgba(255,255,255,0.4); color: white;
  font-size: 1rem; font-weight: 600;
  transition: all var(--transition);
}
.btn-outline-white:hover { border-color: white; background: rgba(255,255,255,0.08); }

/* ---------- Footer ---------- */
.footer { background: #0E1225; color: rgba(255,255,255,0.7); padding: 4rem 2rem 2rem; }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-logo { color: white; font-size: 1.4rem; font-weight: 800; margin-bottom: 1rem; }
.footer-desc { font-size: 0.88rem; line-height: 1.7; max-width: 260px; }
.footer-col-title { color: white; font-size: 0.93rem; font-weight: 600; margin-bottom: 1rem; }
.footer-links { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-links a { font-size: 0.85rem; transition: color var(--transition); }
.footer-links a:hover { color: white; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem; font-size: 0.83rem;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.75rem;
}
.footer-contact { display: flex; gap: 1.5rem; flex-wrap: wrap; margin-top: 1rem; }
.footer-contact-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.85rem; }

/* ---------- Page Hero (sub pages) ---------- */
.page-hero {
  padding-top: var(--nav-height);
  background: linear-gradient(135deg, var(--bg-dark) 0%, #162142 100%);
  color: white; text-align: center; padding-bottom: 5rem;
}
.page-hero-inner { padding-top: 5rem; max-width: 860px; margin: 0 auto; padding-left: 2rem; padding-right: 2rem; }
.page-hero-label {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(255,255,255,0.1); border-radius: 100px;
  padding: 0.35rem 1rem; font-size: 0.83rem; margin-bottom: 1.25rem;
  border: 1px solid rgba(255,255,255,0.15);
}
.page-hero-title { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; margin-bottom: 1rem; }
.page-hero-desc { font-size: 1rem; color: rgba(255,255,255,0.7); line-height: 1.75; max-width: 640px; margin: 0 auto; }

/* ---------- Accordion ---------- */
.accordion-item {
  border-bottom: 1px solid var(--border);
}
.accordion-btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 1.25rem 0; font-size: 0.98rem; font-weight: 600;
  cursor: pointer; transition: color var(--transition);
  background: none; border: none; text-align: left; font-family: var(--font);
}
.accordion-btn:hover { color: var(--primary); }
.accordion-btn svg { transition: transform var(--transition); flex-shrink: 0; }
.accordion-btn.open svg { transform: rotate(180deg); }
.accordion-body {
  overflow: hidden; max-height: 0; transition: max-height 0.4s ease;
}
.accordion-body.open { max-height: 500px; }
.accordion-content { padding: 0 0 1.25rem; font-size: 0.88rem; color: var(--text-secondary); line-height: 1.75; }

/* ---------- Table ---------- */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  background: var(--bg-light); text-align: left; padding: 0.85rem 1rem;
  font-size: 0.85rem; font-weight: 600; color: var(--text-secondary);
  border-bottom: 2px solid var(--border);
}
.data-table td {
  padding: 0.85rem 1rem; font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}
.data-table tr:hover td { background: #F7F9FC; }

/* ---------- Tab Nav ---------- */
.tab-nav {
  display: flex; gap: 0; border-bottom: 2px solid var(--border);
  overflow-x: auto; margin-bottom: 2.5rem;
}
.tab-btn {
  padding: 0.85rem 1.5rem; font-size: 0.92rem; font-weight: 500;
  color: var(--text-muted); border-bottom: 2px solid transparent;
  margin-bottom: -2px; white-space: nowrap; cursor: pointer;
  transition: all var(--transition); background: none; border-top: none; border-left: none; border-right: none;
  font-family: var(--font);
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center;
  padding: 0.2rem 0.65rem; border-radius: 100px;
  font-size: 0.75rem; font-weight: 600;
}
.badge-blue { background: var(--primary-light); color: var(--primary); }
.badge-teal { background: #E0FAF8; color: var(--accent-dark); }
.badge-orange { background: #FFF3E0; color: #E65100; }
.badge-green { background: #E8F5E9; color: #2E7D32; }
.badge-purple { background: #F3E5F5; color: #7B1FA2; }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #CBD5E0; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #A0AEC0; }

/* ---------- Gradient Text ---------- */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 2rem; right: 2rem; z-index: 9999;
  background: var(--text-primary); color: white;
  padding: 0.85rem 1.5rem; border-radius: 10px; font-size: 0.9rem;
  box-shadow: var(--shadow-lg); transform: translateY(100px); opacity: 0;
  transition: all var(--transition);
}
.toast.show { transform: translateY(0); opacity: 1; }

/* ---------- Loading ---------- */
.skeleton {
  background: linear-gradient(90deg, #F0F0F0 25%, #E0E0E0 50%, #F0F0F0 75%);
  background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 6px;
}
@keyframes shimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ---------- Mobile Hamburger (赛邮风格) ---------- */
.nav-mobile-btn {
  display: none; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 8px;
  color: var(--text-primary); transition: background var(--transition);
}
.nav-mobile-btn:hover { background: var(--bg-light); }
.nav-mobile-menu {
  display: none; position: fixed; top: var(--nav-height); left: 0; right: 0; bottom: 0;
  background: white; overflow-y: auto; padding: 1rem 1.5rem;
  z-index: 999; flex-direction: column; gap: 0;
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-link {
  display: block; padding: 0.9rem 0; font-size: 1rem; font-weight: 600;
  border-bottom: 1px solid var(--border); color: var(--text-primary);
}
.nav-mobile-link:hover { color: var(--primary); }
.nav-mobile-group {
  padding: 0.5rem 0; border-bottom: 1px solid var(--border);
}
.nav-mobile-group-title {
  padding: 0.6rem 0 0.4rem; font-size: 0.85rem; font-weight: 700;
  color: var(--primary); display: flex; align-items: center; justify-content: space-between;
}
.nav-mobile-sub { padding-left: 0.5rem; margin-top: 0.4rem; }
.nav-mobile-sub a {
  display: block; padding: 0.55rem 0; font-size: 0.9rem; color: var(--text-secondary);
  position: relative; padding-left: 1rem;
}
.nav-mobile-sub a:hover { color: var(--primary); }
.nav-mobile-sub a::before { content: '·'; position: absolute; left: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .nav-menu { display: none; }
  .nav-mobile-btn { display: flex; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .hero-stats { gap: 2rem; }
}
@media (max-width: 600px) {
  .section { padding: 4rem 1.25rem; }
  .footer-top { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; align-items: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.flex-wrap { flex-wrap: wrap; }
.w-full { width: 100%; }
.overflow-hidden { overflow: hidden; }

/* ---------- Animations ---------- */
.fade-up { opacity: 0; transform: translateY(24px); transition: all 0.6s cubic-bezier(0.4,0,0.2,1); }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ---------- Icon color helpers ---------- */
.icon-blue { background: var(--primary-light) !important; color: var(--primary) !important; }
.icon-teal { background: #E0FAF8 !important; color: var(--accent-dark) !important; }
.icon-orange { background: #FFF3E0 !important; color: #E65100 !important; }
.icon-green { background: #E8F5E9 !important; color: #2E7D32 !important; }
.icon-purple { background: #F3E5F5 !important; color: #7B1FA2 !important; }
.icon-red { background: #FFEBEE !important; color: #C62828 !important; }
.icon-indigo { background: #E8EAF6 !important; color: #3949AB !important; }
.icon-yellow { background: #FFFDE7 !important; color: #F9A825 !important; }

/* ---------- Two-col layout ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.two-col.reverse .two-col-text { order: 2; }
.two-col.reverse .two-col-visual { order: 1; }
@media (max-width:860px) { .two-col { grid-template-columns: 1fr; gap: 2.5rem; } }

/* ---------- Visual Card ---------- */
.visual-card {
  background: linear-gradient(135deg, var(--primary-light) 0%, #E0FAF8 100%);
  border-radius: var(--radius-lg); padding: 2.5rem; position: relative; overflow: hidden;
}
.visual-card-inner {
  background: white; border-radius: var(--radius); padding: 1.5rem;
  box-shadow: var(--shadow-md); position: relative; z-index: 1;
}

/* ---------- Clients ---------- */
.clients-track { overflow: hidden; position: relative; padding: 1.5rem 0; }
.clients-inner {
  display: flex; gap: 3rem; align-items: center;
  animation: marquee 30s linear infinite;
  width: max-content;
}
.clients-inner:hover { animation-play-state: paused; }
@keyframes marquee { 0%{transform:translateX(0)} 100%{transform:translateX(-50%)} }
.client-logo {
  height: 36px; opacity: 0.5; filter: grayscale(100%);
  transition: all var(--transition); white-space: nowrap;
  font-size: 1.1rem; font-weight: 700; color: var(--text-muted);
  padding: 0 0.5rem;
}
.client-logo:hover { opacity: 1; filter: none; }

/* ---------- Floating Buttons ---------- */
.float-bar {
  position: fixed; right: 1.5rem; bottom: 2rem; z-index: 998;
  display: flex; flex-direction: column; gap: 0.75rem;
}
.float-btn {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--primary); color: white;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(0,87,255,0.35);
  transition: all var(--transition); cursor: pointer; font-size: 1.1rem;
}
.float-btn:hover { transform: scale(1.1); background: var(--primary-dark); }
.float-btn.back-top { background: white; color: var(--primary); border: 1.5px solid var(--primary-light); box-shadow: var(--shadow-md); }

/* ---------- 行业解决方案 (营销转化) ---------- */
.solution-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem;
}
.solution-card {
  background: white; border-radius: var(--radius);
  padding: 1.75rem 1.5rem; text-align: center;
  border: 1.5px solid var(--border); cursor: pointer;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.solution-card:hover {
  border-color: var(--primary); transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.solution-card-icon { font-size: 2.2rem; margin-bottom: 0.85rem; }
.solution-card-name { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.4rem; }
.solution-card-pain {
  font-size: 0.78rem; color: var(--text-muted);
  line-height: 1.6; margin-bottom: 0.85rem;
}
.solution-card-btn {
  font-size: 0.82rem; color: var(--primary); font-weight: 600;
  opacity: 0; transition: opacity var(--transition);
}
.solution-card:hover .solution-card-btn { opacity: 1; }
@media (max-width:900px) { .solution-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width:500px) { .solution-grid { grid-template-columns: 1fr; } }

/* ---------- 开发者友好展示区 ---------- */
.dev-showcase {
  background: linear-gradient(135deg, #0E1225 0%, #162142 100%);
  border-radius: var(--radius-lg); padding: 3.5rem 2.5rem;
  color: white; overflow: hidden; position: relative;
}
.dev-showcase::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 500px; height: 500px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,87,255,0.15) 0%, transparent 70%);
}
.dev-showcase h3 { margin-bottom: 0.5rem; }
.dev-showcase p {
  color: rgba(255,255,255,0.65); max-width: 500px;
  line-height: 1.7; margin-bottom: 2rem;
}
.dev-features { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 1rem; margin-bottom: 2rem; }
.dev-feature-item {
  display: flex; align-items: flex-start; gap: 0.75rem;
  background: rgba(255,255,255,0.06); border-radius: 10px;
  padding: 1rem 1.15rem; border: 1px solid rgba(255,255,255,0.08);
}
.dev-feature-icon {
  width: 36px; height: 36px; flex-shrink: 0; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.dev-feature-text h4 { font-size: 0.88rem; font-weight: 600; margin-bottom: 0.2rem; }
.dev-feature-text p { font-size: 0.8rem; color: rgba(255,255,255,0.5); margin-bottom: 0; }

/* ---------- 信任背书区 ---------- */
.trust-section { background: var(--bg-light); }
.trust-certs {
  display: flex; justify-content: center; gap: 2.5rem;
  flex-wrap: wrap; margin-top: 2.5rem;
}
.trust-cert {
  display: flex; align-items: center; gap: 0.65rem;
  background: white; border-radius: 12px; padding: 1rem 1.5rem;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.trust-cert-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; background: var(--primary-light); color: var(--primary);
}
.trust-cert-text { font-size: 0.83rem; font-weight: 600; color: var(--text-primary); }
.trust-promises {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
  gap: 1rem; margin-top: 2rem;
}
.trust-promise {
  display: flex; align-items: center; gap: 0.75rem;
  background: white; border-radius: 10px; padding: 1rem 1.25rem;
  border: 1px solid var(--border);
}
.trust-promise-check { width: 24px; height: 24px; border-radius: 50%; background: #E8F5E9; color: #27AE60; display: flex; align-items: center; justify-content: center; font-size: 0.75rem; flex-shrink: 0; }
.trust-promise-text { font-size: 0.87rem; font-weight: 600; }