/* ============================================
   AI Marathon Coach - 官方网站样式
   域名: safepb.cn
   公司: 成都小慈科技有限公司
   ============================================ */

/* CSS 变量定义 */
:root {
  /* 品牌色 */
  --color-primary-50: #EFF6FF;
  --color-primary-100: #DBEAFE;
  --color-primary-200: #BFDBFE;
  --color-primary-300: #93C5FD;
  --color-primary-400: #60A5FA;
  --color-primary-500: #3B82F6;
  --color-primary-600: #2563EB;
  --color-primary-700: #1D4ED8;
  --color-primary-800: #1E40AF;
  --color-primary-900: #1E3A8A;

  /* 辅助色 */
  --color-secondary-50: #FFF7ED;
  --color-secondary-100: #FFEDD5;
  --color-secondary-200: #FED7AA;
  --color-secondary-300: #FDBA74;
  --color-secondary-400: #FB923C;
  --color-secondary-500: #F97316;
  --color-secondary-600: #EA580C;
  --color-secondary-700: #C2410C;

  /* 中性色 */
  --color-white: #FFFFFF;
  --color-neutral-50: #FAFAFA;
  --color-neutral-100: #F5F5F5;
  --color-neutral-200: #E5E5E5;
  --color-neutral-300: #D4D4D4;
  --color-neutral-400: #A3A3A3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;

  /* 语义色 */
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-display: "PingFang SC", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;

  /* 间距 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.5);
  --shadow-glow-orange: 0 0 20px rgba(249, 115, 22, 0.4);

  /* 圆角 */
  --radius-sm: 0.125rem;
  --radius: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms ease;
}

/* 重置样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-neutral-800);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* 容器 */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  z-index: 50;
  transition: all var(--transition);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-white);
  transition: color var(--transition);
}

.navbar.scrolled .logo {
  color: var(--color-primary-900);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-secondary-500), var(--color-secondary-400));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  font-size: 1rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  position: relative;
  transition: color var(--transition-fast);
}

.navbar.scrolled .nav-link {
  color: var(--color-neutral-600);
}

.nav-link:hover {
  color: var(--color-white);
}

.navbar.scrolled .nav-link:hover {
  color: var(--color-primary-500);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary-500);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-cta {
  display: none;
  padding: 0.625rem 1.25rem;
  background: var(--color-primary-500);
  color: var(--color-white);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

@media (min-width: 768px) {
  .nav-cta {
    display: inline-flex;
  }
}

.nav-cta:hover {
  background: var(--color-primary-600);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* 移动端菜单 */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: all var(--transition-fast);
}

.navbar.scrolled .mobile-menu-btn span {
  background: var(--color-neutral-800);
}

/* Hero 区域 */
.hero {
  min-height: 100vh;
  min-height: 700px;
  background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary-800) 25%, var(--color-primary-600) 50%, var(--color-primary-500) 75%, var(--color-primary-400) 100%);
  display: flex;
  align-items: center;
  padding-top: 72px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-content {
  text-align: center;
}

@media (min-width: 1024px) {
  .hero-content {
    text-align: left;
  }
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease-out;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 3.75rem;
  }
}

.hero-subtitle {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.6;
  margin-bottom: var(--space-8);
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 1.25rem;
  }
}

.hero-ctas {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

@media (min-width: 640px) {
  .hero-ctas {
    flex-direction: row;
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .hero-ctas {
    justify-content: flex-start;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  padding: 1rem 2rem;
  background: linear-gradient(135deg, var(--color-secondary-500), var(--color-secondary-400));
  color: var(--color-white);
  font-size: 1.125rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.5);
}

.btn-secondary {
  padding: 1rem 2rem;
  background: transparent;
  color: var(--color-white);
  font-size: 1.125rem;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-full);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.hero-visual {
  display: none;
  position: relative;
}

@media (min-width: 1024px) {
  .hero-visual {
    display: block;
  }
}

.hero-phone {
  width: 280px;
  height: 560px;
  background: var(--color-neutral-800);
  border-radius: 40px;
  padding: 12px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 40px rgba(255, 255, 255, 0.2);
  animation: float 3s ease-in-out infinite;
  margin: 0 auto;
}

.hero-phone-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--color-primary-500), var(--color-primary-700));
  border-radius: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  padding: var(--space-6);
  text-align: center;
}

.hero-phone-icon {
  font-size: 4rem;
  margin-bottom: var(--space-4);
}

.hero-phone-text {
  font-size: 1.25rem;
  font-weight: 600;
}

/* 信任背书 */
.hero-trust {
  position: absolute;
  bottom: var(--space-12);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  animation: fadeInUp 0.6s ease-out 0.6s both;
}

.trust-avatars {
  display: flex;
}

.trust-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-600));
  border: 2px solid var(--color-white);
  margin-left: -8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--color-white);
}

.trust-avatar:first-child {
  margin-left: 0;
}

/* 区块标题 */
.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-neutral-900);
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.25rem;
  }
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-neutral-500);
  max-width: 600px;
  margin: 0 auto;
}

/* 功能特性区 */
.features {
  padding: var(--space-20) 0;
  background: var(--color-white);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-500);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: var(--space-6);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-neutral-900);
  margin-bottom: var(--space-2);
}

.feature-desc {
  font-size: 1rem;
  color: var(--color-neutral-500);
  line-height: 1.6;
}

/* 目标用户区 */
.target-users {
  padding: var(--space-20) 0;
  background: var(--color-neutral-50);
}

.users-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .users-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.user-card {
  background: var(--color-white);
  border-radius: var(--radius-3xl);
  padding: var(--space-10);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  text-align: center;
}

.user-avatar {
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-600));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin: 0 auto var(--space-6);
}

.user-type {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-neutral-900);
  margin-bottom: var(--space-2);
}

.user-tag {
  display: inline-block;
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.user-benefits {
  text-align: left;
}

.user-benefits li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-neutral-600);
  margin-bottom: var(--space-3);
}

.user-benefits li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-secondary-500);
  border-radius: 50%;
  flex-shrink: 0;
}

/* 产品展示区 */
.showcase {
  padding: var(--space-20) 0;
  background: var(--color-white);
  overflow: hidden;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .showcase-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.showcase-item {
  text-align: center;
}

.showcase-phone {
  width: 100%;
  max-width: 220px;
  aspect-ratio: 9/19;
  background: var(--color-neutral-800);
  border-radius: 28px;
  padding: 10px;
  margin: 0 auto var(--space-4);
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.25),
    0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  transition: all var(--transition);
  overflow: hidden;
}

.showcase-phone:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 
    0 35px 60px -15px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(255, 255, 255, 0.1) inset;
}

.showcase-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--color-primary-500), var(--color-primary-700));
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 2rem;
}

.showcase-screen-img {
  width: 100%;
  height: 100%;
  border-radius: 20px;
  overflow: hidden;
  position: relative;
}

.showcase-screen-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.5s ease;
}

.showcase-phone:hover .showcase-screen-img img {
  transform: scale(1.05);
}

.showcase-label {
  font-size: 0.875rem;
  color: var(--color-neutral-500);
}

/* 定价区 */
.pricing {
  padding: var(--space-24) 0;
  background: linear-gradient(180deg, var(--color-primary-900) 0%, var(--color-primary-800) 50%, var(--color-primary-600) 100%);
}

.pricing .section-title,
.pricing .section-subtitle {
  color: var(--color-white);
}

.pricing .section-subtitle {
  color: rgba(255, 255, 255, 0.8);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: 800px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.pricing-card {
  position: relative;
  border-radius: var(--radius-3xl);
  padding: var(--space-10);
}

.pricing-card-monthly {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.pricing-card-yearly {
  background: var(--color-white);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.pricing-badge {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--color-secondary-500);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  border-radius: 0 var(--radius-3xl) 0 var(--radius-xl);
}

.pricing-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.pricing-card-monthly .pricing-name {
  color: var(--color-white);
}

.pricing-card-yearly .pricing-name {
  color: var(--color-neutral-900);
}

.pricing-price {
  display: flex;
  align-items: flex-start;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}

.pricing-currency {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--space-1);
}

.pricing-card-monthly .pricing-currency {
  color: rgba(255, 255, 255, 0.9);
}

.pricing-card-yearly .pricing-currency {
  color: var(--color-neutral-600);
}

.pricing-amount {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
}

.pricing-card-monthly .pricing-amount {
  color: var(--color-white);
}

.pricing-card-yearly .pricing-amount {
  color: var(--color-neutral-900);
}

.pricing-period {
  font-size: 1rem;
  opacity: 0.7;
  align-self: flex-end;
  margin-bottom: var(--space-2);
}

.pricing-save {
  display: inline-block;
  background: var(--color-secondary-100);
  color: var(--color-secondary-700);
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.pricing-features {
  margin-bottom: var(--space-8);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: 1rem;
}

.pricing-card-monthly .pricing-features li {
  color: rgba(255, 255, 255, 0.9);
}

.pricing-card-yearly .pricing-features li {
  color: var(--color-neutral-600);
}

.pricing-features li::before {
  content: '✓';
  width: 20px;
  height: 20px;
  background: var(--color-primary-500);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.pricing-btn {
  width: 100%;
  padding: var(--space-4);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-xl);
  transition: all var(--transition-fast);
}

.pricing-card-monthly .pricing-btn {
  background: var(--color-white);
  color: var(--color-primary-600);
}

.pricing-card-monthly .pricing-btn:hover {
  background: var(--color-neutral-100);
}

.pricing-card-yearly .pricing-btn {
  background: linear-gradient(135deg, var(--color-secondary-500), var(--color-secondary-400));
  color: var(--color-white);
}

.pricing-card-yearly .pricing-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-orange);
}

/* CTA 区 */
.cta-section {
  padding: var(--space-16) 0;
  background: var(--color-white);
  text-align: center;
}

.cta-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-neutral-900);
  margin-bottom: var(--space-3);
}

.cta-subtitle {
  font-size: 1rem;
  color: var(--color-neutral-500);
  margin-bottom: var(--space-8);
}

.cta-note {
  font-size: 0.875rem;
  color: var(--color-neutral-400);
  margin-top: var(--space-4);
}

/* 页脚 */
.footer {
  background: var(--color-neutral-900);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }
}

.footer-brand {
  max-width: 280px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-desc {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-social {
  display: flex;
  gap: var(--space-4);
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-primary-500);
  color: var(--color-white);
  transform: scale(1.1);
}

.footer-copyright {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

/* 动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* 功能页特定样式 */
.page-header {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary-600) 100%);
  text-align: center;
}

.page-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.page-subtitle {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  margin: 0 auto;
}

/* 功能详情 */
.feature-detail {
  padding: var(--space-20) 0;
}

.feature-detail:nth-child(even) {
  background: var(--color-neutral-50);
}

.feature-detail-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

@media (min-width: 1024px) {
  .feature-detail-inner {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .feature-detail:nth-child(even) .feature-detail-inner {
    direction: rtl;
  }
  
  .feature-detail:nth-child(even) .feature-detail-content {
    direction: ltr;
  }
}

.feature-detail-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  margin-bottom: var(--space-6);
}

.feature-detail-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-neutral-900);
  margin-bottom: var(--space-4);
}

.feature-detail-desc {
  font-size: 1.125rem;
  color: var(--color-neutral-600);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.feature-detail-list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-neutral-700);
  margin-bottom: var(--space-3);
}

.feature-detail-list li::before {
  content: '✓';
  width: 24px;
  height: 24px;
  background: var(--color-success);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.feature-detail-visual {
  background: linear-gradient(180deg, #EFF6FF 0%, #FFFFFF 100%);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-3xl);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
  transition: all var(--transition);
}

.feature-detail:hover .feature-detail-visual {
  box-shadow: 0 25px 50px rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.4);
}

.feature-detail-visual-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  border-radius: var(--radius-3xl);
  transition: transform 0.5s ease;
}

.feature-detail:hover .feature-detail-visual-img {
  transform: scale(1.05);
}

/* 关于页 */
.about-content {
  padding: var(--space-20) 0;
}

.about-section {
  max-width: 800px;
  margin: 0 auto var(--space-16);
  text-align: center;
}

.about-section:last-child {
  margin-bottom: 0;
}

.about-heading {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-neutral-900);
  margin-bottom: var(--space-4);
}

.about-text {
  font-size: 1.125rem;
  color: var(--color-neutral-600);
  line-height: 1.8;
}

.company-info {
  background: var(--color-primary-50);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  margin-top: var(--space-8);
}

.company-info-item {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  font-size: 1rem;
}

.company-info-label {
  color: var(--color-neutral-500);
}

.company-info-value {
  color: var(--color-neutral-900);
  font-weight: 600;
}

/* 定价页对比表 */
.pricing-compare {
  padding: var(--space-20) 0;
  background: var(--color-white);
}

.compare-table {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  border-collapse: collapse;
}

.compare-table th,
.compare-table td {
  padding: var(--space-4) var(--space-6);
  text-align: left;
  border-bottom: 1px solid var(--color-neutral-200);
}

.compare-table th {
  font-weight: 600;
  color: var(--color-neutral-900);
  background: var(--color-neutral-50);
}

.compare-table td {
  color: var(--color-neutral-600);
}

.compare-table td:last-child,
.compare-table th:last-child {
  text-align: center;
}

.compare-check {
  color: var(--color-success);
  font-weight: 700;
}

.compare-cross {
  color: var(--color-neutral-400);
}

/* FAQ */
.faq-section {
  padding: var(--space-20) 0;
  background: var(--color-neutral-50);
}

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

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-neutral-900);
  text-align: left;
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: transform var(--transition);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-neutral-600);
  line-height: 1.8;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 48px;
  height: 48px;
  background: var(--color-primary-500);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 40;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-primary-600);
  transform: translateY(-2px);
}

/* ============================================
   内测专区样式
   ============================================ */

/* 内测权益区块 */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

@media (min-width: 640px) {
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .benefits-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.benefit-card {
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  text-align: center;
  border: 1px solid var(--color-neutral-200);
  transition: all var(--transition);
}

.benefit-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-500);
}

.benefit-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.benefit-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-neutral-900);
  margin-bottom: var(--space-2);
}

.benefit-desc {
  font-size: 1rem;
  color: var(--color-neutral-600);
  line-height: 1.6;
}

.beta-cta {
  text-align: center;
  padding: var(--space-10);
  margin-top: var(--space-8);
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
  border-radius: var(--radius-3xl);
  color: var(--color-white);
}

.beta-cta .btn-large {
  padding: 1.25rem 2.5rem;
  font-size: 1.25rem;
  background: var(--color-white);
  color: var(--color-primary-600);
}

.beta-cta .btn-large:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
}

.beta-note {
  margin-top: var(--space-4);
  font-size: 0.875rem;
  opacity: 0.9;
}

/* 设备支持 */
.device-support {
  text-align: center;
  padding: var(--space-10) 0 var(--space-6);
  border-top: 1px solid var(--color-neutral-200);
  margin-top: var(--space-8);
}

.device-label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-neutral-500);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.device-icons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
}

.device-icon {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--color-neutral-600);
  padding: var(--space-2) var(--space-4);
  background: var(--color-neutral-50);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.device-icon:hover {
  background: var(--color-primary-50);
  color: var(--color-primary-600);
}

/* FAQ 样式增强 */
.faq-section {
  padding: var(--space-20) 0;
  background: var(--color-neutral-50);
}

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

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  overflow: hidden;
  border: 1px solid var(--color-neutral-200);
}

.faq-question {
  width: 100%;
  padding: var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-neutral-900);
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-neutral-50);
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: transform var(--transition);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-neutral-600);
  line-height: 1.8;
  display: none;
  font-size: 1rem;
}

.faq-item.active .faq-answer {
  display: block;
}