/* 
 * 游戏平台 CSS 重构
 * 基于文档: docs/css_refactoring.md
 */

/* ==========================================================================
   1. 设计系统 (Design System)
   ========================================================================== */

:root {
  /* 1.1 色彩系统 */
  /* 主色调 - 深色商务蓝 */
  --color-primary: #2C3E50;
  --color-primary-dark: #1a252f;
  --color-primary-light: #34495e;
  
  /* 辅助色 - 活力亮蓝 */
  --color-secondary: #3498DB;
  --color-secondary-dark: #2980b9;
  --color-secondary-light: #5dade2;
  
  /* 中性色 - 浅灰背景 */
  --color-neutral: #ECF0F1;
  --color-neutral-dark: #bdc3c7;
  --color-neutral-light: #f8f9fa;
  
  /* 功能色 */
  --color-success: #27AE60;
  --color-warning: #F39C12;
  --color-error: #E74C3C;
  --color-info: #3498DB;
  
  /* 文本色 */
  --color-text-primary: #2C3E50;
  --color-text-secondary: #7f8c8d;
  --color-text-light: #95a5a6;
  --color-text-inverse: #ffffff;

  /* 1.2 间距系统 (8px基准) */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  
  --spacing-section: 80px;
  --spacing-container: 120px;

  /* 1.3 字体层级 */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-xxl: 32px;
  --font-size-xxxl: 48px;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.8;

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* ==========================================================================
   2. 基础重置 (Reset & Base)
   ========================================================================== */

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-neutral-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

/* ==========================================================================
   3. 布局系统 (Layout)
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid--2-col { grid-template-columns: repeat(2, 1fr); }
.grid--3-col { grid-template-columns: repeat(3, 1fr); }
.grid--4-col { grid-template-columns: repeat(4, 1fr); }

.flex { display: flex; }
.flex--column { flex-direction: column; }
.flex--center { justify-content: center; align-items: center; }
.flex--between { justify-content: space-between; align-items: center; }
.flex--wrap { flex-wrap: wrap; }

/* 章节通用样式 */
.section {
  padding: var(--spacing-section) 0;
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section__title {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ==========================================================================
   4. 组件样式 (Components)
   ========================================================================== */

/* 4.1 按钮 (Buttons) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn--primary {
  background-color: var(--color-secondary);
  color: var(--color-text-inverse);
}
.btn--primary:hover {
  background-color: var(--color-secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background-color: var(--color-neutral);
  color: var(--color-text-primary);
}
.btn--secondary:hover {
  background-color: var(--color-neutral-dark);
}

.btn--outline {
  background-color: transparent;
  border: 2px solid var(--color-text-inverse);
  color: var(--color-text-inverse);
}
.btn--outline:hover {
  background-color: var(--color-text-inverse);
  color: var(--color-primary);
}

.btn--lg {
  padding: var(--spacing-sm) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

/* 4.2 导航栏 (Navbar) */
.navbar {
  background-color: var(--color-primary);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.navbar__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar__logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
}

.navbar__menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.navbar__link {
  color: rgba(255, 255, 255, 0.8);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-xs) 0;
  position: relative;
  transition: color 0.2s ease;
}

.navbar__link:hover,
.navbar__link--active {
  color: var(--color-text-inverse);
}

.navbar__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: width 0.3s ease;
}

.navbar__link:hover::after,
.navbar__link--active::after {
  width: 100%;
}

.navbar__actions {
  display: flex;
  gap: var(--spacing-sm);
}

.navbar__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-inverse);
  font-size: 24px;
  cursor: pointer;
}

/* 4.3 Hero 区域 */
.hero {
  position: relative;
  height: 600px;
  background-color: var(--color-primary);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero__content {
  position: relative;
  z-index: 2;
  color: var(--color-text-inverse);
  max-width: 600px;
}

.hero__title {
  font-size: var(--font-size-xxxl);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  opacity: 0;
  animation: slideUp 0.8s ease forwards;
}

.hero__desc {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
  opacity: 0;
  animation: slideUp 0.8s ease 0.2s forwards;
}

.hero__actions {
  opacity: 0;
  animation: slideUp 0.8s ease 0.4s forwards;
}

.hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  z-index: 1;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 4.4 卡片 (Cards) */
.card {
  background-color: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card__image {
  position: relative;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
  background-color: var(--color-neutral);
  overflow: hidden;
}

.card__image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card__image img {
  transform: scale(1.05);
}

.card__content {
  padding: var(--spacing-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card__meta {
  font-size: var(--font-size-xs);
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xs);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
}

.card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.card__footer {
  margin-top: auto;
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--color-neutral);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* 4.5 统计模块 (Stats) */
.stats {
  background-color: #fff;
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-lg);
  position: relative;
  z-index: 10;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  align-items: center;
  justify-items: center;
}

.stats__item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  transition: transform 0.3s ease;
}

.stats__item:hover {
  transform: translateY(-4px);
}

.stats__item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: calc(var(--spacing-lg) * -0.5);
  top: 20%;
  height: 60%;
  width: 1px;
  background-color: var(--color-neutral);
}

.stats__number {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
  color: var(--color-secondary);
  margin-bottom: var(--spacing-xs);
  text-align: center;
}

.stats__label {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-align: center;
}

/* 4.6 特性列表 (Features) */
.feature-card {
  padding: var(--spacing-lg);
  background-color: #fff;
  border-radius: 8px;
  border: 1px solid var(--color-neutral);
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--color-secondary);
  transform: translateY(-2px);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  background-color: rgba(52, 152, 219, 0.1);
  color: var(--color-secondary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: var(--spacing-md);
}

.feature-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.feature-card__text {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 4.7 页脚 (Footer) */
.footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding-top: var(--spacing-xxl);
  font-size: var(--font-size-sm);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer__brand h3 {
  color: var(--color-text-inverse);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.footer__title {
  color: var(--color-text-inverse);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.footer__list {
  list-style: none;
}

.footer__list li {
  margin-bottom: var(--spacing-xs);
}

.footer__link {
  transition: color 0.2s ease;
}

.footer__link:hover {
  color: var(--color-secondary);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-md) 0;
  text-align: center;
}

/* ==========================================================================
   5. 响应式调整 (Responsive)
   ========================================================================== */

@media (max-width: 1024px) {
  .grid--4-col { grid-template-columns: repeat(2, 1fr); }
  .grid--3-col { grid-template-columns: repeat(2, 1fr); }
  
  .stats__grid { 
    grid-template-columns: repeat(2, 1fr); 
    gap: var(--spacing-md);
  }
  .stats__item:not(:last-child)::after { display: none; }
}

@media (max-width: 768px) {
  .grid--2-col, .grid--3-col, .grid--4-col { grid-template-columns: 1fr; }
  
  .footer__grid { grid-template-columns: 1fr; gap: var(--spacing-lg); }
  
  .navbar__menu, .navbar__actions { display: none; }
  .navbar__toggle { display: block; }
  
  .navbar__mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    padding: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .hero { height: auto; padding: var(--spacing-xxl) 0; text-align: center; }
  .hero__content { margin: 0 auto; }
  .hero__actions { justify-content: center; }
  
  .section__title { font-size: 28px; }
}

/* ==========================================================================
   6. 辅助工具 (Utilities)
   ========================================================================== */

.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.bg-neutral { background-color: var(--color-neutral-light); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* Alpine.js cloak */
[x-cloak] { display: none !important; }

/* ==========================================================================
   7. 移动端适配 (Mobile Adaptation)
   ========================================================================== */

/* 7.1 动态视口高度（由JavaScript设置--vh变量） */
:root {
  --vh: 1vh;
}

.full-height-mobile {
  min-height: calc(var(--vh, 1vh) * 100);
}

/* 7.2 触摸设备优化 */
.touch-target {
  min-width: 44px;
  min-height: 44px;
}

.touch-action-none {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

/* 7.3 安全区域 */
.safe-area-top {
  padding-top: env(safe-area-inset-top);
}

.safe-area-bottom {
  padding-bottom: env(safe-area-inset-bottom);
}

.safe-area-left {
  padding-left: env(safe-area-inset-left);
}

.safe-area-right {
  padding-right: env(safe-area-inset-right);
}

/* 7.4 移动端显示/隐藏工具类 */
@media (max-width: 768px) {
  .hide-mobile { display: none !important; }
}

@media (min-width: 769px) {
  .show-mobile-only { display: none !important; }
}

/* 7.5 横屏/竖屏显示控制 */
body.is-landscape .hide-landscape { display: none !important; }
body.is-portrait .hide-portrait { display: none !important; }

/* 7.6 虚拟键盘打开时的优化 */
body.keyboard-open {
  /* 键盘打开时减少不必要的元素 */
}

body.keyboard-open .hide-on-keyboard {
  display: none !important;
}

/* 7.7 触摸设备hover禁用（防止粘滞hover状态） */
@media (hover: none) {
  .card:hover,
  .btn:hover,
  .feature-card:hover {
    transform: none;
  }
}

/* 7.8 移动端输入框优化 */
@media (max-width: 768px) {
  input[type="text"],
  input[type="email"],
  input[type="password"],
  input[type="tel"],
  input[type="number"],
  textarea,
  select {
    font-size: 16px !important; /* 防止iOS自动缩放 */
    touch-action: manipulation;
  }
}

/* 7.9 触摸设备点击反馈 */
body.is-touch .clickable:active,
body.is-touch .btn:active,
body.is-touch .card:active {
  opacity: 0.8;
  transform: scale(0.98);
}

/* 7.10 横屏模式下固定导航栏占位 */
@media (orientation: landscape) and (max-height: 500px) {
  body {
    padding-top: 48px;
  }
  
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
  }
}

/* 7.11 移动端按钮尺寸优化 */
@media (max-width: 480px) {
  .btn {
    min-height: 44px;
    padding: 12px 20px;
  }
  
  .btn--lg {
    min-height: 48px;
    padding: 14px 24px;
  }
}