/* =============================================
   健科慧数字科技官网 - 主样式
   科技风格设计
   ============================================= */

/* CSS变量 */
:root {
  --primary: #0066ff;
  --primary-light: #3388ff;
  --secondary: #00d4ff;
  --accent: #7b2fff;
  --bg-dark: #050a1a;
  --bg-card: #0a1628;
  --bg-card2: #0d1f3c;
  --border: rgba(0, 102, 255, 0.2);
  --border-light: rgba(0, 212, 255, 0.15);
  --text-primary: #e8f0ff;
  --text-secondary: #8899bb;
  --text-muted: #4a5f80;
  --gradient: linear-gradient(135deg, #0066ff, #00d4ff);
  --gradient-card: linear-gradient(135deg, rgba(0,102,255,0.1), rgba(0,212,255,0.05));
  --shadow-glow: 0 0 40px rgba(0, 102, 255, 0.3);
  --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.4);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 重置样式 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }
body {
  font-family: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================================
   导航栏
   ============================================= */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(5, 10, 26, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}
.logo-icon,
.logo-icon img { width: 40px; height: 40px; }
.logo-icon img { object-fit: contain; display: block; }
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.logo-main {
  font-size: 15px;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-sub {
  font-size: 11px;
  color: var(--text-secondary);
  letter-spacing: 2px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-link {
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient);
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}
.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}
.nav-btn {
  padding: 8px 20px;
  background: var(--gradient);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: white !important;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(0, 102, 255, 0.4);
}
.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 102, 255, 0.5);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* =============================================
   Hero区域
   ============================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  background: url('../images/hero-bg.png') center/cover no-repeat;
  opacity: 0.45;
  z-index: 0;
}
.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5,10,26,0.3) 0%, rgba(5,10,26,0.85) 100%);
  z-index: 1;
  pointer-events: none;
}
.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,102,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,102,255,0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 2;
  pointer-events: none;
}
.grid-lines::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 70% 50%, rgba(0,102,255,0.12) 0%, transparent 70%),
              radial-gradient(ellipse 40% 40% at 20% 60%, rgba(0,212,255,0.08) 0%, transparent 60%);
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 5;
}
.hero-content { max-width: 560px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 102, 255, 0.1);
  border: 1px solid rgba(0, 102, 255, 0.3);
  border-radius: 20px;
  font-size: 13px;
  color: var(--secondary);
  margin-bottom: 24px;
}
.badge-dot {
  width: 6px; height: 6px;
  background: var(--secondary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
  position: relative;
  z-index: 10;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}
.btn svg { width: 18px; height: 18px; pointer-events: none; }
.btn-primary {
  background: var(--gradient);
  color: white;
  box-shadow: 0 8px 30px rgba(0, 102, 255, 0.4);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0, 102, 255, 0.5);
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(0, 102, 255, 0.05);
}
.btn-full { width: 100%; justify-content: center; }
.hero-stats {
  display: flex;
  gap: 40px;
}
.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-num {
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 12px;
  color: var(--text-muted);
}

/* 仪表盘模拟 */
.hero-visual {
  display: flex;
  justify-content: center;
}
.dashboard-mockup {
  width: 100%;
  max-width: 500px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-glow), var(--shadow-card);
  animation: floatY 4s ease-in-out infinite;
}
.mockup-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: rgba(0, 102, 255, 0.08);
  border-bottom: 1px solid var(--border);
}
.mockup-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.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(--text-secondary);
}
.mockup-body {
  display: flex;
  height: 280px;
}
.mockup-sidebar {
  width: 130px;
  padding: 16px 0;
  border-right: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
}
.sidebar-item {
  padding: 9px 16px;
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  border-left: 2px solid transparent;
}
.sidebar-item.active {
  color: var(--secondary);
  background: rgba(0, 212, 255, 0.08);
  border-left-color: var(--secondary);
}
.mockup-main {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mini-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.mini-card {
  background: rgba(0, 102, 255, 0.08);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}
.mini-card-num {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}
.mini-card-label {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}
.mini-card-trend {
  font-size: 10px;
  margin-top: 4px;
}
.mini-card-trend.up { color: #00c853; }
.mini-chart {
  flex: 1;
  background: rgba(0, 102, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: flex;
  flex-direction: column;
}
.chart-bars {
  flex: 1;
  display: flex;
  align-items: flex-end;
  gap: 6px;
}
.bar {
  flex: 1;
  background: rgba(0, 102, 255, 0.3);
  border-radius: 3px 3px 0 0;
  transition: var(--transition);
}
.bar.active {
  background: var(--gradient);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.4);
}
.chart-label {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 8px;
  text-align: center;
}
.scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  z-index: 1;
}
.scroll-arrow {
  width: 20px; height: 20px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  animation: bounceDown 1.5s infinite;
}

/* =============================================
   通用Section样式
   ============================================= */
.section {
  padding: 100px 0;
  position: relative;
}
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--secondary);
  margin-bottom: 12px;
  padding: 4px 14px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 20px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* =============================================
   产品区域
   ============================================= */
.product-section {
  background: linear-gradient(180deg, var(--bg-dark) 0%, #060d1f 100%);
}
.product-core {
  margin-bottom: 48px;
}
.product-intro {
  display: flex;
  align-items: flex-start;
  gap: 32px;
  padding: 36px;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}
.product-intro::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(0,102,255,0.1) 0%, transparent 70%);
  pointer-events: none;
}
.product-logo-big svg,
.product-logo-big img { height: 80px; flex-shrink: 0; }
.product-logo-big img { width: auto; object-fit: contain; display: block; border-radius: 20px; overflow: hidden; }
.product-intro-text h3 {
  font-size: 32px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.product-intro-text p:first-of-type {
  font-size: 16px;
  color: var(--text-secondary);
  margin: 4px 0 16px;
}
.product-intro-desc {
  color: var(--text-secondary);
  line-height: 1.8;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
.feature-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--gradient);
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover {
  border-color: rgba(0, 102, 255, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 102, 255, 0.15);
}
.feature-card:hover::before {
  transform: scaleX(1);
}
.feature-icon {
  font-size: 36px;
  margin-bottom: 16px;
}
.feature-card h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.product-modules { margin-top: 8px; }
.modules-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.modules-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.module-item {
  padding: 24px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: var(--transition);
  cursor: default;
}
.module-item:hover {
  background: rgba(0, 102, 255, 0.08);
  border-color: rgba(0, 102, 255, 0.4);
}
.module-icon { font-size: 28px; margin-bottom: 10px; }
.module-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.module-desc {
  font-size: 12px;
  color: var(--text-muted);
}

/* 八大核心功能 */
.product-functions {
  margin: 20px 0 48px;
}
.functions-main-title {
  font-size: 24px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 10px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.functions-subtitle {
  text-align: center;
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 36px;
}
.functions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.function-card {
  display: flex;
  gap: 24px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  overflow: hidden;
  position: relative;
}
.function-card::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 150px; height: 150px;
  background: radial-gradient(circle, rgba(0,102,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.function-card:hover {
  border-color: rgba(0, 102, 255, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 102, 255, 0.15);
}
.function-img {
  flex-shrink: 0;
  width: 120px;
  height: 90px;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(0, 102, 255, 0.06);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}
.function-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.function-info {
  flex: 1;
  position: relative;
  z-index: 1;
}
.function-info h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.function-info p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}
.function-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.func-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 10px;
  font-size: 11px;
  color: var(--secondary);
  white-space: nowrap;
}

/* =============================================
   成功案例
   ============================================= */
.cases-section {
  background: #060d1f;
}
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}
.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.case-card:hover {
  border-color: rgba(0, 102, 255, 0.4);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0, 102, 255, 0.15);
}
.case-header {
  padding: 24px;
  background: var(--gradient-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
}
.case-icon { font-size: 36px; }
.case-title-wrap h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}
.case-tag {
  display: inline-block;
  padding: 2px 10px;
  background: rgba(0, 102, 255, 0.15);
  border: 1px solid rgba(0, 102, 255, 0.3);
  border-radius: 10px;
  font-size: 11px;
  color: var(--secondary);
}
.case-body { padding: 24px; }
.case-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}
.case-results {
  display: flex;
  gap: 16px;
}
.case-result {
  flex: 1;
  text-align: center;
  padding: 12px 8px;
  background: rgba(0, 102, 255, 0.06);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.case-result-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--secondary);
}
.case-result-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}
.cases-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.cases-stat {
  text-align: center;
  padding: 32px 24px;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.cases-stat:hover {
  border-color: rgba(0, 102, 255, 0.4);
}
.cases-stat-num {
  font-size: 36px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.cases-stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

/* =============================================
   关于我们
   ============================================= */
.about-section {
  background: var(--bg-dark);
}
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
  align-items: start;
}
.about-intro p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-values {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.value-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.value-icon { font-size: 24px; flex-shrink: 0; }
.value-item h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--secondary);
}
.value-item p {
  font-size: 13px;
  color: var(--text-secondary);
}
.about-timeline h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 28px;
}
.timeline {
  position: relative;
  padding-left: 24px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--primary), transparent);
}
.timeline-item {
  position: relative;
  padding: 0 0 28px 24px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -5px; top: 6px;
  width: 12px; height: 12px;
  background: var(--primary);
  border-radius: 50%;
  border: 2px solid var(--bg-dark);
  box-shadow: 0 0 10px var(--primary);
}
.timeline-year {
  font-size: 13px;
  color: var(--secondary);
  font-weight: 600;
  margin-bottom: 4px;
}
.timeline-event {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.timeline-desc {
  font-size: 13px;
  color: var(--text-muted);
}

/* =============================================
   联系我们
   ============================================= */
.contact-section {
  background: #060d1f;
}
.contact-content {
  width: 100%;
}
.contact-info-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 28px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.contact-items {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.contact-item:hover {
  border-color: rgba(0, 102, 255, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 102, 255, 0.08);
}
.contact-item-icon {
  font-size: 24px;
  flex-shrink: 0;
  width: 52px; height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 102, 255, 0.1);
  border-radius: var(--radius-sm);
}
.contact-item-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.contact-item-value {
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.5;
}

/* =============================================
   页脚
   ============================================= */
.footer {
  background: #020710;
  border-top: 1px solid var(--border);
  padding: 60px 0 24px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  margin-bottom: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 18px;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-logo svg,
.footer-logo img { width: 36px; height: 36px; }
.footer-logo img { object-fit: contain; display: block; }
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  max-width: 280px;
  line-height: 1.7;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--secondary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.05);
  font-size: 12px;
  color: var(--text-muted);
}

/* =============================================
   Toast / 提示
   ============================================= */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(0, 102, 255, 0.9);
  color: white;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 9999;
  backdrop-filter: blur(10px);
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 回到顶部 */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 80px;
  width: 44px; height: 44px;
  background: var(--gradient);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 20px rgba(0, 102, 255, 0.4);
}
.back-top svg { width: 20px; height: 20px; color: white; }
.back-top.show {
  opacity: 1;
  transform: translateY(0);
}
.back-top:hover { transform: translateY(-3px); }

/* =============================================
   响应式 - 平板
   ============================================= */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .modules-grid { grid-template-columns: repeat(3, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-stats { grid-template-columns: repeat(2, 1fr); }
  .functions-grid { grid-template-columns: 1fr; }
}

/* =============================================
   响应式 - 手机
   ============================================= */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .logo-main { font-size: 13px; }
  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(5, 10, 26, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px 24px 32px;
    gap: 0;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 1001;
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    font-size: 16px;
  }
  .nav-btn {
    margin-top: 16px;
    text-align: center;
    display: block;
    padding: 12px;
  }
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual { display: none; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .product-intro {
    flex-direction: column;
    padding: 24px;
  }
  .features-grid { grid-template-columns: 1fr; }
  .modules-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: 1fr; }
  .cases-stats { grid-template-columns: repeat(2, 1fr); }
  .about-content { grid-template-columns: 1fr; }
  .contact-items { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .section { padding: 60px 0; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 32px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .modules-grid { grid-template-columns: 1fr 1fr; }
  .footer-links { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .functions-grid { grid-template-columns: 1fr; }
  .function-card { flex-direction: column; }
  .function-img { width: 100%; height: 120px; }
}