/* ============================================
   企业App下载页 - 主样式 (Bing SEO优化)
   ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #0078D4;
  --primary-dark: #005A9E;
  --primary-light: #00B4D8;
  --success: #3DDC84;
  --success-dark: #2ECC71;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-light: #718096;
  --bg-light: #f7f9fc;
  --bg-white: #ffffff;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
  text-decoration: none;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,120,212,0.35);
}

.btn-success {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.btn-success:hover {
  background: var(--success-dark);
  border-color: var(--success-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(61,220,132,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.btn-white {
  background: white;
  color: var(--primary);
  border-color: white;
}

.btn-white:hover {
  background: #f0f8ff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,255,255,0.3);
}

.btn-outline-white {
  background: transparent;
  color: white;
  border-color: rgba(255,255,255,0.6);
}

.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  border-color: white;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
  border-radius: 10px;
}

/* ============================================
   导航栏
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-wrap {
  display: flex;
  align-items: center;
  height: 70px;
  gap: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--text-primary);
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo-icon-sm {
  width: 30px;
  height: 30px;
}

.logo-text {
  color: var(--primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  flex: 1;
}

.nav a {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding-bottom: 2px;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

.nav a:hover {
  color: var(--primary);
}

.nav a:hover::after {
  width: 100%;
}

.nav-cta {
  margin-left: auto;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   Section公共样式
   ============================================ */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Hero区域
   ============================================ */
.hero {
  padding: 130px 0 80px;
  background: linear-gradient(135deg, #f0f7ff 0%, #e8f4fd 50%, #f0f7ff 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0,120,212,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  background: linear-gradient(135deg, #fff7e6, #fff);
  border: 1px solid #ffc107;
  color: #9a6700;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 36px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-item strong {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-item span {
  font-size: 13px;
  color: var(--text-light);
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-trust {
  font-size: 13px;
  color: var(--text-light);
}

/* 手机模型 */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.phone-mockup {
  width: 260px;
  height: 520px;
  background: #1a1a2e;
  border-radius: 40px;
  padding: 12px;
  box-shadow: 
    0 40px 80px rgba(0,0,0,0.25),
    inset 0 0 0 2px rgba(255,255,255,0.1);
  position: relative;
}

.phone-mockup::before {
  content: '';
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 24px;
  background: #1a1a2e;
  border-radius: 0 0 14px 14px;
  z-index: 10;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, #f7f9fc 0%, #ffffff 100%);
  border-radius: 30px;
  overflow: hidden;
  padding: 32px 16px 16px;
}

.app-ui {
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.app-header-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
}

.app-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  flex-shrink: 0;
}

.app-title-bar {
  flex: 1;
  height: 10px;
  background: var(--border);
  border-radius: 5px;
}

.app-bell {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff7e6;
  border: 2px solid #ffc107;
  flex-shrink: 0;
}

.app-cards {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.app-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: 10px;
  background: white;
  box-shadow: var(--shadow-sm);
}

.app-card-blue { border-left: 3px solid var(--primary); }
.app-card-green { border-left: 3px solid #00C851; }
.app-card-purple { border-left: 3px solid #7C3AED; }

.card-icon { font-size: 18px; }

.card-lines { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.card-line {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
}
.w80 { width: 80%; }
.w70 { width: 70%; }
.w90 { width: 90%; }
.w60 { width: 60%; }
.w50 { width: 50%; }
.w65 { width: 65%; }

.app-chart {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  padding: 12px;
  background: white;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  flex: 1;
}

.chart-bar {
  flex: 1;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: 4px 4px 0 0;
  min-height: 20px;
  opacity: 0.8;
}

.chart-bar:nth-child(4) { opacity: 1; }

/* 浮动徽章 */
.floating-badge {
  position: absolute;
  background: white;
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 6px;
  animation: float 3s ease-in-out infinite;
}

.badge-1 { bottom: 20%; left: -10%; animation-delay: 0s; }
.badge-2 { top: 15%; right: -10%; animation-delay: 1.5s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ============================================
   信任品牌
   ============================================ */
.trust-section {
  padding: 40px 0;
  background: white;
  border-bottom: 1px solid var(--border);
}

.trust-label {
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 24px;
}

.trust-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}

.trust-logo {
  font-size: 15px;
  font-weight: 600;
  color: #aab4c0;
  transition: color var(--transition);
  cursor: default;
}

.trust-logo:hover {
  color: var(--primary);
}

/* ============================================
   功能特性
   ============================================ */
.features {
  padding: 100px 0;
  background: var(--bg-light);
}

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

.feature-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.feature-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(0,120,212,0.1);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 26px;
  height: 26px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   下载区域
   ============================================ */
.download {
  padding: 100px 0;
  background: white;
}

.version-info {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.version-badge {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
}

.version-date,
.version-size {
  font-size: 14px;
  color: var(--text-light);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.download-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  border: 2px solid var(--border);
  text-align: center;
  transition: all var(--transition);
  position: relative;
}

.download-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.featured-card {
  border-color: var(--primary);
  background: linear-gradient(180deg, #f0f8ff 0%, white 100%);
  box-shadow: var(--shadow-lg);
}

.featured-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  padding: 5px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
}

.platform-icon {
  margin: 0 auto 20px;
  width: 72px;
  height: 72px;
}

.platform-icon svg {
  width: 100%;
  height: 100%;
}

.download-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.platform-desc {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 24px;
  line-height: 1.7;
}

.qr-placeholder {
  width: 140px;
  height: 140px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-light);
  transition: border-color var(--transition);
}

.download-card:hover .qr-placeholder {
  border-color: var(--primary);
}

.qr-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.qr-inner svg {
  width: 100px;
  height: 100px;
}

.qr-inner p {
  font-size: 11px;
  color: var(--text-light);
}

.btn-download {
  width: 100%;
  margin-bottom: 10px;
}

.btn-download-sm {
  width: 100%;
  margin-bottom: 10px;
  padding: 10px 20px;
  font-size: 14px;
}

.pc-download-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 10px;
}

.download-note {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 8px;
}

/* 安装指南 */
.install-guide {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-top: 20px;
}

.install-guide h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 28px;
  color: var(--text-primary);
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.guide-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.step-num {
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

.step-content strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.step-content p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   用户评价
   ============================================ */
.reviews {
  padding: 100px 0;
  background: var(--bg-light);
}

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

.review-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
}

.review-card::before {
  content: '"';
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 80px;
  color: var(--primary);
  opacity: 0.08;
  font-family: Georgia, serif;
  line-height: 1;
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,120,212,0.15);
}

.review-stars {
  color: #ffc107;
  font-size: 18px;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.review-card footer {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.reviewer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

.reviewer-name {
  display: block;
  font-style: normal;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}

.reviewer-title {
  font-size: 12px;
  color: var(--text-light);
}

/* ============================================
   FAQ
   ============================================ */
.faq {
  padding: 100px 0;
  background: white;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item:hover,
.faq-item[open] {
  border-color: var(--primary);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  list-style: none;
  user-select: none;
  background: white;
  transition: background var(--transition);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item[open] summary {
  background: #f0f8ff;
}

.faq-item summary h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
  margin: 0;
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 400;
  color: var(--primary);
  flex-shrink: 0;
  transition: all var(--transition);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.faq-answer {
  padding: 0 24px 20px;
  background: #f0f8ff;
}

.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   CTA区域
   ============================================ */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary) 0%, #005A9E 50%, #003d6b 100%);
}

.cta-box {
  text-align: center;
  color: white;
}

.cta-box h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-box p {
  font-size: 1.1rem;
  opacity: 0.85;
  margin-bottom: 36px;
}

.cta-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: #0f172a;
  color: white;
  padding: 60px 0 30px;
}

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

.footer-brand .logo {
  margin-bottom: 16px;
  display: inline-flex;
}

.footer-brand .logo-text {
  color: white;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 700;
  color: rgba(255,255,255,0.9);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.45);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

.footer-bottom a {
  color: rgba(255,255,255,0.5);
}

.footer-bottom a:hover {
  color: white;
}

.icp {
  font-size: 12px !important;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-visual {
    order: -1;
  }

  .hero-stats {
    justify-content: center;
  }

  .hero-btns {
    justify-content: center;
  }

  .badge-1, .badge-2 {
    display: none;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    gap: 0;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    font-size: 16px;
  }

  .nav a:last-child {
    border-bottom: none;
  }

  .nav-cta {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .download-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
  }

  .guide-steps {
    grid-template-columns: 1fr;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .section-header h2 {
    font-size: 1.6rem;
  }

  .cta-box h2 {
    font-size: 1.6rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .version-info {
    flex-direction: column;
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.7rem;
  }

  .hero-btns {
    flex-direction: column;
    width: 100%;
  }

  .hero-btns .btn {
    width: 100%;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-btns {
    flex-direction: column;
    align-items: center;
  }

  .phone-mockup {
    width: 200px;
    height: 400px;
  }
}

/* ============================================
   加载动画
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.5s ease forwards;
}

/* 滚动出现动画 */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   辅助样式
   ============================================ */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: rgba(0,120,212,0.15);
  color: var(--text-primary);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
  background: #c1cdd8;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #a0b0be;
}