/* ============================================
   小柒的游戏百宝箱 - Design System v2
   极简玻璃风格 | 暖白底 + 毛玻璃 + 珊瑚粉
   ============================================ */

/* ---- CSS 变量 ---- */
:root {
  /* 色彩系统 - 暖白玻璃 */
  --bg-primary: #faf8f5;
  --bg-secondary: rgba(255, 255, 255, 0.72);
  --bg-tertiary: rgba(255, 255, 255, 0.85);
  --bg-elevated: #ffffff;
  
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --text-inverse: #ffffff;
  
  --accent-coral: #ff6b8a;
  --accent-coral-light: #ff8fa8;
  --accent-coral-dark: #e84a6e;
  --accent-indigo: #6366f1;
  --accent-indigo-light: #818cf8;
  --accent-green: #10b981;
  --accent-yellow: #f59e0b;
  --accent-red: #ef4444;
  
  --border-subtle: rgba(0, 0, 0, 0.06);
  --border-default: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.12);
  
  /* 阴影系统 - 更柔和 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.03);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 48px rgba(0,0,0,0.1), 0 8px 16px rgba(0,0,0,0.05);
  --shadow-glow-coral: 0 0 24px rgba(255, 107, 138, 0.2);
  --shadow-glow-indigo: 0 0 24px rgba(99, 102, 241, 0.15);
  
  /* 圆角系统 - 更大更圆 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 9999px;
  
  /* 间距系统 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  
  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", monospace;
  
  /* 过渡 */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- 自定义滚动条 - 极简 ---- */
::-webkit-scrollbar {
  width: 5px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: var(--radius-pill);
  opacity: 0.3;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-coral);
}

/* ---- 选中文字 ---- */
::selection {
  background: rgba(255, 107, 138, 0.2);
  color: var(--text-primary);
}

/* ---- 链接 ---- */
a {
  color: var(--accent-indigo);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--accent-indigo-light);
}

/* ---- 按钮系统 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}
.btn:hover::after {
  transform: translateX(100%);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-coral), var(--accent-coral-dark));
  color: white;
  box-shadow: 0 4px 14px rgba(255, 107, 138, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-glow-coral), 0 8px 20px rgba(255, 107, 138, 0.4);
}
.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(0,0,0,0.04);
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: 13px;
  border-radius: var(--radius-sm);
}

/* ---- 毛玻璃卡片 ---- */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-coral), var(--accent-indigo));
  opacity: 0;
  transition: opacity var(--transition-base);
}
.card:hover {
  transform: translateY(-6px) scale(1.01);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-xl);
}
.card:hover::before {
  opacity: 1;
}

/* 大卡片 - 焦点内容 */
.card-featured {
  border-radius: var(--radius-xl);
  padding: 0;
  overflow: hidden;
  position: relative;
}
.card-featured .card-image {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.card-featured:hover .card-image {
  transform: scale(1.05);
}
.card-featured .card-content {
  padding: var(--space-6);
  position: relative;
  background: linear-gradient(to top, rgba(255,255,255,0.95), var(--bg-secondary));
}

/* ---- 标签 Pill ---- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  background: rgba(0,0,0,0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}
.tag:hover {
  background: rgba(0,0,0,0.08);
  color: var(--text-primary);
}
.tag-coral {
  background: rgba(255, 107, 138, 0.1);
  color: var(--accent-coral);
  border-color: rgba(255, 107, 138, 0.15);
}
.tag-coral:hover {
  background: rgba(255, 107, 138, 0.15);
}
.tag-indigo {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-indigo);
  border-color: rgba(99, 102, 241, 0.15);
}
.tag-indigo:hover {
  background: rgba(99, 102, 241, 0.15);
}
.tag-green {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.15);
}

/* ---- 导航栏 - 毛玻璃 ---- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(250, 248, 245, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-default);
  transition: all var(--transition-base);
}
.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(0,0,0,0.04);
}
.nav-link.active {
  color: var(--text-primary);
  background: rgba(0,0,0,0.06);
}

/* ---- 汉堡菜单按钮 - 可爱樱花风 ---- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: var(--radius-pill);
  color: var(--accent-coral);
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
  position: relative;
}
.nav-toggle:hover {
  background: rgba(255, 107, 138, 0.08);
  transform: scale(1.05);
}
.nav-toggle:active {
  transform: scale(0.92);
}

/* 可爱的汉堡图标 - 三条圆润的线 */
.nav-toggle-icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 24px;
  height: 24px;
  position: relative;
  transition: transform var(--transition-base);
}
.nav-toggle-icon span {
  display: block;
  width: 22px;
  height: 2.5px;
  background: var(--accent-coral);
  border-radius: 4px;
  transition: all var(--transition-base);
  transform-origin: center;
}
/* 打开状态 → 变成 ✕ */
.nav-toggle.open .nav-toggle-icon {
  transform: rotate(180deg);
}
.nav-toggle.open .nav-toggle-icon span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
  width: 20px;
}
.nav-toggle.open .nav-toggle-icon span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle.open .nav-toggle-icon span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
  width: 20px;
}

/* ---- 页面标题区 ---- */
.hero {
  text-align: center;
  padding: var(--space-20) var(--space-6) var(--space-16);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,107,138,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-coral) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-4);
  position: relative;
}
.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
  font-weight: 400;
}

/* ---- 区块标题 ---- */
.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-primary);
}
.section-title .emoji {
  font-size: 1.4em;
}

/* ---- 分隔线标题 ---- */
.section-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-12) 0 var(--space-6);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.section-divider::before,
.section-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-default);
}

/* ---- 网格布局 ---- */
.grid {
  display: grid;
  gap: var(--space-5);
}
.grid-3 {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.grid-2 {
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

/* ---- 容器 ---- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ---- 页脚 - 极简 ---- */
.footer {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  border-top: 1px solid var(--border-default);
  color: var(--text-muted);
  font-size: 14px;
  margin-top: var(--space-16);
}

/* ---- 动画系统 ---- */

/* Stagger 入场 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 滚动显示 */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: all 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger 子元素 */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.08s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.16s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.24s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.32s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.40s; }
.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* 页面加载动画 */
.page-load > * {
  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}
.page-load > *:nth-child(1) { animation-delay: 0s; }
.page-load > *:nth-child(2) { animation-delay: 0.1s; }
.page-load > *:nth-child(3) { animation-delay: 0.2s; }
.page-load > *:nth-child(4) { animation-delay: 0.3s; }
.page-load > *:nth-child(5) { animation-delay: 0.4s; }

/* 图片模糊加载 */
.img-blur {
  filter: blur(8px);
  transition: filter 0.5s ease;
}
.img-blur.loaded {
  filter: blur(0);
}

/* 脉冲动画 */
.pulse {
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ---- 响应式 ---- */
@media (max-width: 768px) {
  .hero {
    padding: var(--space-12) var(--space-4) var(--space-10);
  }
  .hero::before {
    width: 300px;
    height: 300px;
  }
  .hero-title {
    font-size: clamp(1.8rem, 7vw, 2.5rem);
  }
  .hero-subtitle {
    font-size: 0.95rem;
  }
  .grid-3, .grid-2, .grid-4 {
    grid-template-columns: 1fr;
  }
  .container {
    padding: 0 var(--space-4);
  }
  .nav-container {
    padding: 0 var(--space-4);
  }
  .nav-links {
    display: none;
  }
  .nav-links.show {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(250, 248, 245, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--space-4);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--border-default);
    gap: var(--space-2);
    box-shadow: var(--shadow-lg);
  }
  .nav-toggle {
    display: flex;
  }
  .nav-links .nav-link {
    padding: var(--space-3) var(--space-5);
    font-size: 15px;
    width: 100%;
  }

  /* 卡片手机优化 */
  .card {
    padding: var(--space-4);
  }
  .card-featured .card-content {
    padding: var(--space-4);
  }
  .card:hover {
    transform: none;
  }
  .card:active {
    transform: scale(0.98);
  }

  /* 游戏封面自适应 */
  .game-cover {
    height: auto;
    aspect-ratio: 460/215;
  }

  /* 按钮全宽 */
  .btn {
    width: 100%;
    justify-content: center;
    padding: var(--space-3) var(--space-5);
    min-height: 44px;
  }

  /* 下载页工具封面 */
  .page-downloads .tool-card .tool-cover {
    height: 100px;
    font-size: 3rem;
  }

  /* 触摸反馈 */
  .nav-link, .card, .btn, .game-card, .card-featured {
    -webkit-tap-highlight-color: transparent;
  }

  /* 页脚 */
  .footer {
    padding: var(--space-8) var(--space-4);
  }

  /* 安全区 */
  .navbar {
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
  }
  .container {
    padding-left: max(var(--space-4), env(safe-area-inset-left, 0));
    padding-right: max(var(--space-4), env(safe-area-inset-right, 0));
  }

  /* 返回顶部按钮位置 */
  #backToTop {
    right: calc(16px + env(safe-area-inset-right, 0));
    bottom: calc(16px + env(safe-area-inset-bottom, 0));
    width: 44px;
    height: 44px;
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }
}

/* ---- 工具类 ---- */
.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, var(--accent-coral), var(--accent-indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.gap-4 { gap: var(--space-4); }