// ============================================
// 呼籁旅行官网 - 全局样式
// ============================================

// ---------- 重置 ----------

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

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

body {
  font-family: @font-family-base;
  font-size: @font-size-base;
  line-height: @line-height-base;
  color: @color-text-primary;
  background-color: #FAFAF8;
}

// ---------- 排版 ----------

h1, h2, h3, h4, h5, h6 {
  font-weight: @font-weight-bold;
  line-height: @line-height-tight;
  color: @color-text-primary;
}

h1 {
  font-size: 28px;

  .respond-md({
    font-size: @font-size-hero;
  });

  .respond-lg({
    font-size: @font-size-display;
  });
}

h2 {
  font-size: @font-size-xl;

  .respond-md({
    font-size: @font-size-2xl;
  });
}

h3 {
  font-size: @font-size-lg;

  .respond-md({
    font-size: @font-size-xl;
  });
}

p {
  margin-bottom: @space-md;
  color: @color-text-secondary;
}

a {
  color: @color-primary;
  text-decoration: none;
  transition: color @transition-fast;

  &:hover {
    color: @color-primary-light;
  }
}

ul, ol {
  list-style: none;
}

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

// ---------- 容器 ----------

.container {
  .container();
}

// ---------- 段落区块 ----------

.section {
  .section-padding();
}

.section--gray {
  background-color: @color-bg-gray;
}

.section--warm {
  background-color: @color-bg-warm;
}

.section--green {
  background-color: @color-primary-bg;
}

.section--accent {
  background-color: @color-accent-bg;
}

.section--dark {
  background-color: @color-primary-dark;
  color: rgba(255, 255, 255, 0.9);
}

.section--accent {
  background-color: @color-accent-bg;
}

.section--dark {
  background-color: @color-primary-dark;
  color: rgba(255, 255, 255, 0.9);
}

// ---------- 辅助类 ----------

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

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

// ---------- 页面过渡 ----------

.page-enter-active,
.page-leave-active {
  transition: opacity @transition-base;
}

.page-enter-from,
.page-leave-to {
  opacity: 0;
}

// ---------- 滚动入场动画 ----------

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1), transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);

  &.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

// 子元素交错入场（用于网格）
.reveal-stagger {
  .reveal();

  &:nth-child(2) { transition-delay: 0.08s; }
  &:nth-child(3) { transition-delay: 0.16s; }
  &:nth-child(4) { transition-delay: 0.24s; }
  &:nth-child(5) { transition-delay: 0.32s; }
  &:nth-child(6) { transition-delay: 0.40s; }
}

// ---------- 页面摘要 TL;DR（GEO/SEO 语义摘要块）----------
// 每个页面开头的精准摘要，帮助 AI 和搜索引擎理解"这个页面回答了什么问题"
.page-tldr {
  background: @color-bg-gray;
  border-bottom: 1px solid @color-border;

  .page-tldr-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: @space-md @space-lg;
    border-left: 3px solid @color-primary;
    background: @color-bg-white;
    border-radius: 0 @border-radius-md @border-radius-md 0;

    .respond-md({
      padding: @space-lg @space-xl;
    });

    p {
      font-size: @font-size-sm;
      color: @color-text-secondary;
      line-height: @line-height-loose;
      margin: 0;
    }
  }

  // 容器内居中 + 内边距
  .container {
    padding-top: @space-sm;
    padding-bottom: @space-sm;

    .respond-md({
      padding-top: @space-md;
      padding-bottom: @space-md;
    });
  }
}

// ---------- 全局卡片升级样式 ----------

.card-elevated {
  background: @color-bg-white;
  border: 1px solid @color-border;
  border-radius: @border-radius-lg;
  box-shadow: @shadow-card;
  transition: box-shadow @transition-base, transform @transition-base, border-color @transition-base;

  &:hover {
    box-shadow: @shadow-card-hover;
    transform: translateY(-4px);
    border-color: @color-primary-lighter;
  }
}

// 图片容器通用样式
.img-cover {
  overflow: hidden;
  border-radius: @border-radius-lg @border-radius-lg 0 0;

  img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform @transition-slow;
  }

  &:hover img,
  .card-elevated:hover & img {
    transform: scale(1.05);
  }
}

// ---------- 无障碍：减少动效偏好 ----------

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}