/* ==========================================
   节气网首页样式表 - jieqi-home.css
   符合视觉设计规范与HTML优化规范
   采用连字符命名 + 组件化作用域管理
   ========================================== */

/* ==========================================
   1. CSS 变量定义
   ========================================== */
:root {
  /* 主色系 - 墨色与宣纸白 */
  --color-ink-black: #2C3E50;
  --color-elegant-grey: #7F8C8D;
  --color-paper-white: #F9F9F7;
  
  /* 四季色系 - 五行对应 */
  --color-spring-green: #8FBC8F;      /* 春·木·青 */
  --color-summer-red: #E84749;        /* 夏·火·赤 */
  --color-autumn-orange: #F7B552;     /* 秋·金·金 */
  --color-earth-gold: #D8B26E;        /* 土·黄·平衡 */
  
  /* 辅助色 */
  --color-bamboo-green: #789262;
  --color-light-cream: #F2E5C1;
  
  /* 状态色 */
  --color-success: #27AE60;
  --color-warning: #F39C12;
  --color-error: #E74C3C;
  --color-info: #3498DB;
  
  /* 季节动态变量 (Spring 默认) */
  --season-primary: #8FBC8F;
  --season-bg: #f2f7f2;
  --season-accent: #789262;
  
  /* 字体栈 */
  --font-title: "Kaiti SC", "STKaiti", "KaiTi", serif;
  --font-body: "STSongti-SC-Regular", "Songti SC", "NSimSun", serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-title-weight: 500;
  --font-title-letter-spacing: 0;
  --font-date: var(--font-body);
  --font-date-style: normal;
  
  /* 间距系统 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 60px;
  --spacing-2xl: 80px;
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 50%;
  
  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  
  /* 玻璃态效果 */
  --glass-bg: rgba(255, 255, 255, 0.35);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-backdrop: blur(12px);
  
  /* 容器宽度 */
  --container-max: 1200px;
  --container-wide: 1400px;
}

/* English locale: redefine font variables once, keep selectors clean */
html[lang="en"]:root {
  --font-title: "Georgia", "Times New Roman", "Times", serif;
  --font-title-weight: 700;
  --font-title-letter-spacing: 0.05em;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-date: "Georgia", serif;
  --font-date-style: italic;
}

/* ==========================================
   2. 基础重置与全局样式
   ========================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-ink-black);
  background: var(--color-paper-white);
  overflow-x: hidden;
}

/* 标题字体 - 楷体 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  font-weight: var(--font-title-weight);
  line-height: 1.4;
  letter-spacing: var(--font-title-letter-spacing);
  color: var(--color-ink-black);
}

/* Date ranges and numeric emphasis */
.hero-current-date,
.solar-item-date,
.detail-meta {
  font-family: var(--font-date, var(--font-body));
  font-style: var(--font-date-style, normal);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

/* 链接 */
a {
  color: var(--color-bamboo-green);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--season-primary);
}

a:focus {
  outline: 2px solid var(--color-bamboo-green);
  outline-offset: 2px;
}

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

/* ==========================================
   3. 顶部导航栏
   ========================================== */
.header-nav {
  background: transparent;
  padding: var(--spacing-md) 0;
  position: relative;
  top: auto;
  z-index: 2;
  box-shadow: none;
  border-bottom: none;
}

.header-nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  flex-wrap: nowrap;
}

/* Logo */
.header-nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header-nav-logo img {
  height: 60px;
  width: auto;
  transition: height 0.3s ease;
}

/* 语言切换 */
.header-nav-lang {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-elegant-grey);
}

.header-nav-lang-item {
  color: var(--color-elegant-grey);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}

.header-nav-lang-item:hover {
  color: var(--color-ink-black);
  background: var(--color-light-cream);
}

.header-nav-lang-sep {
  color: var(--color-earth-gold);
}

/* ==========================================
   4. 首屏英雄区
   ========================================== */
.hero-section {
  position: relative;
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-2xl);
  background: linear-gradient(135deg, var(--season-bg) 0%, var(--color-paper-white) 100%);
  overflow: hidden;
}

.hero-nav {
  position: relative;
  z-index: 2;
  margin-bottom: var(--spacing-lg);
}

/* 背景水印 */
.hero-watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-title);
  font-size: 8rem;
  font-weight: 700;
  color: var(--color-ink-black);
  opacity: 0.03;
  white-space: nowrap;
  pointer-events: none;
  writing-mode: vertical-rl;
  letter-spacing: 0.2em;
}

.hero-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  position: relative;
  z-index: 1;
}

/* 当前节气令牌 */
.hero-current {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.hero-current-label {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--color-elegant-grey);
  letter-spacing: 0.3em;
}

.hero-current-token {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border: 2px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease;
}

/* Larger size for English locale */
html[lang="en"] .hero-current-token {
  width: 200px;
  height: 200px;
}

.hero-current-token:hover {
  transform: scale(1.05);
}

.hero-current-name {
  font-size: 2.5rem;
  color: var(--color-ink-black);
  font-weight: 500;
}

.hero-current-date {
  font-size: 0.875rem;
  color: var(--color-elegant-grey);
}

.hero-current-slogan {
  font-family: var(--font-title);
  font-size: 1.125rem;
  color: var(--color-ink-black);
  font-style: italic;
  max-width: 400px;
  line-height: 1.8;
  border-left: 3px solid var(--color-earth-gold);
  padding-left: var(--spacing-md);
  margin: 0;
  quotes: """ """;
}

.hero-current-slogan::before {
  content: open-quote;
}

.hero-current-slogan::after {
  content: close-quote;
}

/* 下一节气倒计时 */
.hero-next {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
}

.hero-next-label {
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--color-elegant-grey);
  letter-spacing: 0.3em;
  margin-bottom: var(--spacing-sm);
}

.hero-next-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.hero-next-name {
  font-family: var(--font-title);
  font-size: 1.5rem;
  color: var(--color-ink-black);
}

.hero-next-countdown {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.hero-next-days {
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--season-primary);
}

.hero-next-unit {
  font-size: 1rem;
  color: var(--color-elegant-grey);
}

.hero-next-date {
  font-size: 0.875rem;
  color: var(--color-elegant-grey);
}

/* ==========================================
   5. 24节气导览区
   ========================================== */
.solar-section {
  padding: var(--spacing-2xl) var(--spacing-md);
  background: var(--color-paper-white);
}

.solar-container {
  max-width: var(--container-wide);
  margin: 0 auto;
}

.solar-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-ink-black);
  letter-spacing: 0.2em;
}

.solar-subtitle {
  text-align: center;
  font-size: 1rem;
  color: var(--color-elegant-grey);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

/* 四季网格 */
.solar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.solar-season {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

/* 四季标题配色 */
.solar-season[data-season="spring"] .solar-season-title {
  color: var(--color-spring-green);
  border-left-color: var(--color-spring-green);
}

.solar-season[data-season="summer"] .solar-season-title {
  color: var(--color-summer-red);
  border-left-color: var(--color-summer-red);
}

.solar-season[data-season="autumn"] .solar-season-title {
  color: var(--color-autumn-orange);
  border-left-color: var(--color-autumn-orange);
}

.solar-season[data-season="winter"] .solar-season-title {
  color: #3B4D5C;
  border-left-color: #3B4D5C;
}

.solar-season-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-sm);
  border-left: 4px solid;
  letter-spacing: 0.2em;
}

.solar-season-items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.solar-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  color: var(--color-ink-black);
}

/* 四季链接悬停效果 */
.solar-season[data-season="spring"] .solar-item:hover {
  background: rgba(143, 188, 143, 0.15);
  transform: translateX(4px);
}

.solar-season[data-season="summer"] .solar-item:hover {
  background: rgba(232, 71, 73, 0.15);
  transform: translateX(4px);
}

.solar-season[data-season="autumn"] .solar-item:hover {
  background: rgba(247, 181, 82, 0.15);
  transform: translateX(4px);
}

.solar-season[data-season="winter"] .solar-item:hover {
  background: rgba(59, 77, 92, 0.15);
  transform: translateX(4px);
}

.solar-item[aria-current="page"] {
  background: var(--color-earth-gold);
  font-weight: 500;
}

.solar-item-name {
  font-family: var(--font-title);
  font-size: 1.125rem;
}

.solar-item-date {
  font-size: 0.875rem;
  color: var(--color-elegant-grey);
}

/* ==========================================
   6. 节气文化区
   ========================================== */
.culture-section {
  padding: var(--spacing-2xl) var(--spacing-md);
  background: var(--color-light-cream);
}

.culture-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.culture-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-ink-black);
  letter-spacing: 0.2em;
}

.culture-subtitle {
  text-align: center;
  color: var(--color-elegant-grey);
  margin: 0 0 var(--spacing-lg);
  line-height: 1.8;
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.culture-card {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.culture-card-title {
  font-size: 1.5rem;
  color: var(--color-ink-black);
  border-bottom: 2px solid var(--color-earth-gold);
  padding-bottom: var(--spacing-sm);
}

.culture-card-desc {
  flex: 1;
  line-height: 1.8;
  color: var(--color-elegant-grey);
}
.culture-tag {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--color-earth-gold);
  border-radius: 999px;
  color: var(--color-earth-gold);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.culture-list {
  padding-left: 0;
  list-style: disc;
  list-style-position: inside;
  color: var(--color-ink-black);
  line-height: 1.7;
  display: grid;
  gap: var(--spacing-xs);
}

.culture-quote {
  border-left: 3px solid var(--color-earth-gold);
  padding-left: var(--spacing-md);
  color: var(--color-elegant-grey);
  font-style: italic;
  line-height: 1.8;
}

/* ==========================================
   6.5 详情页面（通用）
   ========================================== */
.detail-section {
  padding: var(--spacing-md) var(--spacing-md);
  background: var(--color-paper-white);
}

.detail-wrapper {
  max-width: var(--container-max);
  margin: 0 auto;
  background: #fff;
  padding: var(--spacing-xl);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.detail-label {
  display: inline-block;
  background: var(--color-bamboo-green);
  color: #fff;
  padding: 4px 12px;
  font-size: 0.75rem;
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.08em;
}

.detail-meta {
  display: flex;
  gap: var(--spacing-md);
  color: var(--color-earth-gold);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.detail-title {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-ink-black);
}

.detail-content {
  margin-bottom: var(--spacing-lg);
  line-height: 1.9;
  color: var(--color-ink-black);
}

.detail-subsection {
  margin-top: var(--spacing-lg);
}

.detail-subsection-title {
  font-size: 1.25rem;
  color: var(--season-primary);
  margin-bottom: var(--spacing-sm);
  border-left: 4px solid var(--season-primary);
  padding-left: var(--spacing-sm);
}

.detail-subsection-content {
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--color-elegant-grey);
}

/* ===== 新中式平铺风格（共享组件） ===== */
.flat-section { margin-top: var(--spacing-xl); }

.flat-title {
  font-family: var(--font-title);
  font-size: 1.5rem;
  color: var(--color-ink-black);
  letter-spacing: 0.15em;
  margin-bottom: var(--spacing-md);
}

.flat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.flat-card {
  background: #fff;
  border: 1px solid rgba(0,0,0,0.06);
  border-left: 4px solid var(--color-earth-gold);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
}

.flat-card-title {
  font-family: var(--font-title);
  font-size: 1.25rem;
  color: var(--color-ink-black);
  margin-bottom: var(--spacing-sm);
}

.flat-card-desc {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--color-elegant-grey);
  line-height: 1.9;
}

.flat-card-wide { grid-column: 1 / -1; }

@media (max-width: 768px) {
  .detail-wrapper { padding: var(--spacing-lg); }
  .flat-grid { grid-template-columns: 1fr; }
}

/* ==========================================
   7. 页脚
   ========================================== */
.footer-section {
  background: var(--color-paper-white);
  color: var(--color-ink-black);
  padding: var(--spacing-xl) var(--spacing-md);
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: center;
  text-align: center;
}

.footer-line {
  font-size: 0.95rem;
  color: var(--color-ink-black);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  color: var(--color-elegant-grey);
  font-size: 0.9rem;
  transition: color 0.3s ease;
  position: relative;
}

.footer-link:not(:last-child)::after {
  content: '·';
  margin-left: var(--spacing-md);
  color: var(--color-elegant-grey);
}

.footer-link:hover {
  color: var(--color-ink-black);
}

/* ==========================================
   8. 节气详情页样式
   ========================================== */

/* 详情页首屏容器 */
.hero-detail {
  display: block !important;
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-md);
  max-width: 800px;
  margin: 0 auto;
}

.hero-detail .detail-label {
  display: inline-block;
  margin-bottom: var(--spacing-sm);
}

.hero-detail .detail-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero-detail .detail-meta {
  justify-content: center;
  font-size: 1rem;
}

/* 详情页引用样式 */
.detail-quote {
  font-family: var(--font-title);
  font-size: 1.25rem;
  color: var(--season-primary);
  margin-top: var(--spacing-lg);
  font-style: italic;
  line-height: 1.8;
  quotes: """ """;
}

.detail-quote::before {
  content: open-quote;
}

.detail-quote::after {
  content: close-quote;
}

/* 文化引用作者样式 */
.culture-quote-author {
  font-size: 0.875rem;
  color: var(--color-elegant-grey);
  display: inline-block;
  margin-top: var(--spacing-xs);
}

.culture-quote {
  margin-bottom: var(--spacing-md);
  line-height: 1.9;
}

/* 相邻节气导航区域 */
.neighbors-section {
  padding-top: 0;
}

.flat-card {
  text-decoration: none;
  transition: transform 0.3s;
}

/* ==========================================
   9. 响应式设计
   ========================================== */

/* 平板 (≤1024px) */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .solar-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .culture-grid {
    grid-template-columns: 1fr;
  }
}

/* 移动端 (≤768px) */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  /* 导航栏 */
  .header-nav-container { 
    flex-wrap: nowrap; 
    gap: var(--spacing-sm); 
    padding: 0 var(--spacing-md);
  }
  
  /* hero-section 内的导航栏不需要额外边距 */
  .hero-section .header-nav-container {
    padding: 0;
  }
  
  .header-nav-logo img { height: 50px; width: auto; }
  .header-nav-lang { width: auto; justify-content: flex-end; }
  
  /* 首屏 */
  .hero-watermark {
    font-size: 4rem;
  }
  
  .hero-current-token {
    width: 140px;
    height: 140px;
  }
  
  .hero-current-name {
    font-size: 2rem;
  }
  
  /* 节气网格 */
  .solar-grid {
    grid-template-columns: 1fr;
  }
  
  /* 间距调整 */
  .hero-section {
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-xl);
  }

  .solar-section,
  .culture-section {
    padding: var(--spacing-xl) var(--spacing-md);
  }
}

/* 小屏移动端 (≤480px) */
@media (max-width: 480px) {
  .header-nav-logo img {
    height: 50px;
  }
  
  .hero-current-token {
    width: 120px;
    height: 120px;
  }
  
  .hero-current-name {
    font-size: 1.75rem;
  }
  
  .solar-title,
  .culture-title {
    font-size: 1.75rem;
  }
}

/* ==========================================
   Seasonal Styles
   季节样式 - 通过 data-season 属性控制
   ========================================== */

/* Default (Spring) */
:root {
  --season-primary: #8FBC8F;
  --season-bg: #f2f7f2;
  --season-accent: #789262;
}

/* Summer */
body[data-season="summer"] {
  --season-primary: #E84749;
  --season-bg: #faf2f2;
  --season-accent: #b22d2c;
}

/* Autumn */
body[data-season="autumn"] {
  --season-primary: #F7B552;
  --season-bg: #f7f5f0;
  --season-accent: #D8B26E;
}

/* Winter */
body[data-season="winter"] {
  --season-primary: #3B4D5C;
  --season-bg: #D4E7ED;
  --season-accent: #2C3E50;
}

.season-accent {
  color: var(--season-primary);
}

.season-border {
  border-left-color: var(--season-primary);
}