/* ==========================================
   磁力宅 - 全站公共样式
   纯 CSS 实现，无任何 JavaScript 依赖
   ========================================== */

/* ===== CSS Reset ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e7f1 100%);
  min-height: 100vh;
}

/* ===== 变量定义 ===== */
:root {
  --primary-color: #4A6CF7;
  --primary-dark: #3A5AF5;
  --secondary-color: #00D9FF;
  --accent-color: #FF6B6B;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
  --danger-color: #F44336;
  --text-primary: #1A1A2E;
  --text-secondary: #4A4A6A;
  --text-light: #7A7A9A;
  --bg-light: #F8F9FF;
  --bg-white: rgba(255, 255, 255, 0.85);
  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.15);
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --glass-effect: blur(10px) saturate(180%);
}

/* ===== 通用组件 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 16px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(74, 108, 247, 0.3);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(74, 108, 247, 0.4);
}

.btn:active {
  transform: translateY(1px);
}

.btn-secondary {
  background: linear-gradient(135deg, var(--secondary-color) 0%, #00B4E6 100%);
  box-shadow: 0 4px 15px rgba(0, 217, 255, 0.3);
}

.btn-secondary:hover {
  box-shadow: 0 8px 25px rgba(0, 217, 255, 0.4);
}

.btn-lg {
  padding: 18px 40px;
  font-size: 18px;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 36px;
  margin-bottom: 50px;
  color: var(--text-primary);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  margin: 15px auto 0;
  border-radius: 2px;
}

.card {
  background: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
  border: 1px solid var(--border-color);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-medium);
}

/* ===== 头部导航 ===== */
.header {
  background: var(--bg-white);
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  border-bottom: 1px solid var(--border-color);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.5px;
}

.logo::before {
  content: '🧲';
  font-size: 28px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

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

/* 移动端菜单按钮 */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition);
}

.mobile-menu-toggle:hover {
  color: var(--primary-color);
}

/* ===== 页脚 ===== */
.footer {
  background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
  color: #E0E0FF;
  padding: 60px 0 20px;
  margin-top: 80px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-section h3 {
  margin-bottom: 20px;
  color: white;
  font-size: 20px;
  position: relative;
  padding-bottom: 10px;
}

.footer-section h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 2px;
  background: var(--primary-color);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: #B0B0D0;
  text-decoration: none;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-links a:hover {
  color: var(--primary-color);
  transform: translateX(5px);
}

.footer-links a::before {
  content: '→';
  opacity: 0;
  transition: var(--transition);
}

.footer-links a:hover::before {
  opacity: 1;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #8A8AA0;
  font-size: 14px;
}

/* ===== 下载页面通用样式 ===== */
.download-hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.download-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.1) 0%, transparent 40%),
              radial-gradient(circle at 80% 70%, rgba(0,217,255,0.1) 0%, transparent 40%);
  pointer-events: none;
}

.download-hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.download-hero p {
  font-size: 20px;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.download-section {
  padding: 60px 0;
}

.download-info {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 40px;
  margin-bottom: 40px;
}

.download-details {
  background: var(--bg-white);
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  border: 1px solid var(--border-color);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
}

.download-sidebar {
  background: var(--bg-white);
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  height: fit-content;
  position: sticky;
  top: 100px;
  border: 1px solid var(--border-color);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
}

.download-meta {
  background: rgba(74, 108, 247, 0.05);
  padding: 20px;
  border-radius: var(--border-radius);
  margin: 20px 0;
  border: 1px solid rgba(74, 108, 247, 0.1);
}

.download-meta-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 15px;
  font-size: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(0, 0, 0, 0.05);
}

.download-meta-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.download-meta-item strong {
  color: var(--text-primary);
  font-weight: 500;
}

.sha256-box {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 4px;
  padding: 12px;
  font-family: 'Courier New', monospace;
  font-size: 12px;
  word-break: break-all;
  margin-top: 10px;
  color: var(--text-secondary);
}

.install-steps {
  counter-reset: step-counter;
}

.install-step {
  display: flex;
  gap: 20px;
  margin-bottom: 30px;
}

.install-step::before {
  counter-increment: step-counter;
  content: counter(step-counter);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(74, 108, 247, 0.3);
}

.platform-icon {
  font-size: 64px;
  margin-bottom: 20px;
  display: inline-block;
  text-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.warning-box {
  background: linear-gradient(to right, rgba(255, 152, 0, 0.1) 0%, rgba(255, 193, 7, 0.1) 100%);
  border-left: 4px solid var(--warning-color);
  padding: 20px;
  border-radius: var(--border-radius);
  margin: 20px 0;
  backdrop-filter: blur(4px);
}

.warning-box h4 {
  color: var(--warning-color);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.success-box {
  background: linear-gradient(to right, rgba(76, 175, 80, 0.1) 0%, rgba(105, 240, 174, 0.1) 100%);
  border-left: 4px solid var(--success-color);
  padding: 20px;
  border-radius: var(--border-radius);
  margin: 20px 0;
  backdrop-filter: blur(4px);
}

.success-box h4 {
  color: var(--success-color);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ===== 首页特色样式 ===== */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 120px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 10% 20%, rgba(255,255,255,0.1) 0%, transparent 30%),
              radial-gradient(circle at 90% 80%, rgba(0,217,255,0.1) 0%, transparent 40%);
  pointer-events: none;
}

.hero h1 {
  font-size: 56px;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
  text-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  letter-spacing: -0.5px;
}

.hero p {
  font-size: 22px;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto 40px;
  position: relative;
  z-index: 1;
  font-weight: 300;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin: 60px 0;
}

.platform-card {
  background: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 40px 30px;
  text-align: center;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border-color);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  position: relative;
  overflow: hidden;
}

.platform-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.platform-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-heavy);
}

.platform-card:hover::before {
  transform: scaleX(1);
}

.platform-icon-large {
  font-size: 64px;
  margin-bottom: 20px;
  display: inline-block;
  text-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.platform-card h3 {
  font-size: 24px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.platform-card p {
  color: var(--text-light);
  margin-bottom: 20px;
  font-size: 15px;
}

.version-badge {
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  display: inline-block;
  box-shadow: 0 4px 10px rgba(74, 108, 247, 0.3);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-item {
  display: flex;
  gap: 20px;
  padding: 30px;
  background: var(--bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  border: 1px solid var(--border-color);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  transition: var(--transition);
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-medium);
}

.feature-icon {
  font-size: 36px;
  flex-shrink: 0;
  color: var(--primary-color);
  background: rgba(74, 108, 247, 0.1);
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== FAQ 样式 ===== */
.faq-item {
  margin-bottom: 20px;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-light);
  border: 1px solid var(--border-color);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
}

.faq-question {
  width: 100%;
  padding: 25px 20px;
  background: var(--bg-white);
  border: none;
  text-align: left;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
}

.faq-question:hover {
  background: rgba(74, 108, 247, 0.03);
}

.faq-question::after {
  content: '+';
  position: absolute;
  right: 20px;
  font-size: 24px;
  color: var(--primary-color);
  transition: transform 0.3s ease;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(74, 108, 247, 0.1);
}

.faq-answer {
  padding: 0 20px 25px;
  display: none;
  color: var(--text-secondary);
}

/* 使用 :target 伪类实现纯 CSS 展开效果 */
.faq-item:target .faq-answer {
  display: block;
}

.faq-item:target .faq-question::after {
  content: '−';
  transform: rotate(180deg);
}

/* ===== 更新日志样式 ===== */
.changelog-item {
  padding: 30px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-white);
  border-radius: var(--border-radius);
  margin-bottom: 20px;
  box-shadow: var(--shadow-light);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  border: 1px solid var(--border-color);
}

.changelog-version {
  display: inline-block;
  background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 6px 16px;
  border-radius: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  box-shadow: 0 4px 10px rgba(74, 108, 247, 0.3);
}

.changelog-date {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.changelog-date::before {
  content: '📅';
}

.changelog-list {
  margin-left: 20px;
  color: var(--text-secondary);
}

.changelog-list li {
  margin-bottom: 8px;
  position: relative;
}

.changelog-list li::before {
  content: '•';
  color: var(--primary-color);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

/* ===== 响应式设计 ===== */

/* 平板 (768px - 1024px) */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 44px;
  }

  .section-title {
    font-size: 32px;
  }

  .download-info {
    grid-template-columns: 1fr;
  }

  .download-sidebar {
    position: static;
  }
}

/* 手机 (< 768px) */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-white);
    flex-direction: column;
    padding: 40px 20px;
    transition: left 0.3s ease;
    box-shadow: var(--shadow-heavy);
  }

  .nav-menu.active {
    left: 0;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .hero {
    padding: 80px 0;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero p {
    font-size: 18px;
  }

  .section-title {
    font-size: 28px;
  }

  .section {
    padding: 60px 0;
  }

  .download-hero h1 {
    font-size: 36px;
  }

  .platform-grid {
    gap: 20px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .download-details,
  .download-sidebar,
  .card {
    padding: 20px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 15px;
  }

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

  .feature-item {
    flex-direction: column;
    text-align: center;
    padding: 25px 20px;
  }

  .feature-icon {
    margin: 0 auto 15px;
  }

  .install-step {
    flex-direction: column;
    text-align: center;
  }

  .install-step::before {
    margin: 0 auto 15px;
  }
}

/* 小手机 (< 480px) */
@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .section-title {
    font-size: 24px;
  }

  .platform-card {
    padding: 30px 20px;
  }

  .download-meta-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 30px;
  }

  .footer-section h3::after {
    left: 50%;
    transform: translateX(-50%);
  }
}

/* ===== 动画效果 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* 页面加载动画 */
@media (prefers-reduced-motion: no-preference) {
  .platform-card,
  .feature-item,
  .card {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .platform-card.visible,
  .feature-item.visible,
  .card.visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 悬停动画 - 平台卡片 */
.platform-card {
  position: relative;
  overflow: hidden;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
              box-shadow 0.4s ease;
}

.platform-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 15px 40px rgba(74, 108, 247, 0.2);
}

/* 按钮波纹效果 */
.btn {
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::after {
  width: 300px;
  height: 300px;
}

/* 平滑过渡 */
* {
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* ===== 打印样式 ===== */
@media print {
  .header,
  .footer,
  .btn,
  .nav,
  .mobile-menu-toggle {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .section {
    padding: 20px 0;
  }

  .download-meta {
    background: #f5f5f5;
    border: 1px solid #ccc;
  }
}

/* ===== 暗色模式支持（可选） ===== */
@media (prefers-color-scheme: dark) {
  body {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #e2e8f0;
  }

  :root {
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-light: #94a3b8;
    --bg-light: #0f172a;
    --bg-white: rgba(15, 23, 42, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.4);
    --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.5);
  }

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

  .platform-card,
  .card,
  .feature-item {
    background: var(--bg-white);
  }

  .footer {
    background: linear-gradient(135deg, #0a0e1a 0%, #111827 100%);
    color: #cbd5e1;
  }

  .download-meta {
    background: rgba(74, 108, 247, 0.1);
  }

  .sha256-box {
    background: rgba(0, 0, 0, 0.2);
    border-color: var(--border-color);
    color: #94a3b8;
  }

  .warning-box,
  .success-box {
    backdrop-filter: blur(4px);
  }

  .warning-box {
    background: linear-gradient(to right, rgba(255, 152, 0, 0.1) 0%, rgba(255, 193, 7, 0.1) 100%);
  }

  .success-box {
    background: linear-gradient(to right, rgba(76, 175, 80, 0.1) 0%, rgba(105, 240, 174, 0.1) 100%);
  }

  .footer-links a {
    color: #94a3b8;
  }

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

  .faq-question:hover {
    background: rgba(74, 108, 247, 0.1);
  }
}