/* ==========================================================
   我的西北文化探索 · 全站样式
   配色体系（参考 app.json）：深棕 #3E2723 / 米色 #FBF6EC / 暖白卡片
   古朴文化风格 · 响应式适配
   ========================================================== */

:root {
  --color-brown: #3E2723;        /* 深棕：导航 / 标题 / 主色 */
  --color-brown-light: #5D4037;
  --color-brown-soft: #8D6E63;
  --color-bg: #FBF6EC;           /* 米色：页面背景 */
  --color-card: #FFFDF7;         /* 暖白：卡片背景 */
  --color-text: #3E2723;
  --color-text-light: #6D5B4B;
  --color-border: #E7DCC8;
  --color-accent: #A1887F;
  --radius: 10px;
  --shadow-sm: 0 1px 4px rgba(62, 39, 35, 0.08);
  --shadow-md: 0 8px 22px rgba(62, 39, 35, 0.12);
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
}

/* ---------- 基础 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.85;
  font-size: 16px;
}

a {
  color: var(--color-brown-light);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-brown);
}

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

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 顶部导航 site-header / nav / menu ---------- */
.site-header {
  background: var(--color-brown);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.site-header .nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.site-header .brand {
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 700;
  color: #FFFDF7;
  letter-spacing: 2px;
}

.site-header .brand:hover {
  color: #F0E6D2;
}

.site-header .menu {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.site-header .menu a {
  padding: 6px 14px;
  border-radius: 6px;
  color: #EADFCD;
  font-size: 0.95rem;
}

.site-header .menu a:hover {
  background: rgba(255, 253, 247, 0.14);
  color: #FFFFFF;
}

.site-header .menu a.active {
  background: #FFDFF7;
  color: var(--color-brown);
  font-weight: 600;
}

/* ---------- 首页 Hero ---------- */
.hero {
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 253, 247, 0.12) 0%, transparent 45%),
    linear-gradient(135deg, #3E2723 0%, #4E342E 55%, #6D4C41 100%);
  color: #FFFDF7;
  padding: 92px 0 100px;
  text-align: center;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 2.7rem;
  font-weight: 700;
  letter-spacing: 3px;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.28);
}

.hero .lead {
  max-width: 700px;
  margin: 0 auto 32px;
  font-size: 1.1rem;
  line-height: 1.9;
  opacity: 0.95;
}

.hero .cta {
  display: inline-block;
  background: #FFFDF7;
  color: var(--color-brown);
  font-weight: 600;
  padding: 12px 36px;
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  letter-spacing: 1px;
}

.hero .cta:hover {
  background: #F0E6D2;
  color: var(--color-brown);
}

/* ---------- 主内容区 ---------- */
main.container {
  padding-top: 48px;
  padding-bottom: 60px;
}

.provinces,
.intro,
.section {
  margin-bottom: 46px;
}

/* ---------- 区块标题 section-title ---------- */
.section-title {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  color: var(--color-brown);
  margin-bottom: 22px;
  position: relative;
  padding-left: 16px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  bottom: 5px;
  width: 5px;
  border-radius: 3px;
  background: var(--color-brown);
}

/* ---------- 卡片网格 card-grid / card ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.card {
  display: block;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-brown-soft);
}

.card h3 {
  font-family: var(--font-serif);
  font-size: 1.22rem;
  color: var(--color-brown);
  margin-bottom: 10px;
}

.card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ---------- 首页介绍 intro ---------- */
.intro {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 30px 28px;
  box-shadow: var(--shadow-sm);
}

.intro p {
  margin-bottom: 12px;
  color: var(--color-text-light);
}

.intro p:last-child {
  margin-bottom: 0;
}

/* ---------- 关于页 / 省份页 about-page / page-title / topic-title / back ---------- */
.about-page {
  max-width: 860px;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--color-brown);
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 3px double var(--color-border);
  letter-spacing: 2px;
}

.topic-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--color-brown);
  margin-top: 30px;
  margin-bottom: 12px;
  position: relative;
  padding-left: 14px;
}

.topic-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  border-radius: 3px;
  background: var(--color-accent);
}

.about-page p {
  margin-bottom: 12px;
  color: var(--color-text-light);
  text-align: justify;
}

.back {
  margin-top: 40px;
}

.back a {
  display: inline-block;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 10px 26px;
  color: var(--color-brown);
  font-weight: 600;
  transition: background 0.2s ease;
}

.back a:hover {
  background: var(--color-brown);
  color: #FFFDF7;
}

/* ---------- 页脚 footer 与备案区 beian ---------- */
.site-footer {
  background: var(--color-brown);
  color: #D9CDB8;
  padding: 34px 0 30px;
  text-align: center;
  font-size: 0.9rem;
}

.site-footer a {
  color: #EADFCD;
  border-bottom: 1px solid transparent;
}

.site-footer a:hover {
  color: #FFFFFF;
  border-bottom-color: rgba(255, 255, 255, 0.5);
}

.site-footer .beian {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.site-footer .beian-icon {
  width: 16px;
  height: 16px;
  display: inline-block;
}

.site-footer .sep {
  color: rgba(255, 255, 255, 0.35);
  margin: 0 2px;
}

.site-footer .copyright {
  opacity: 0.85;
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

 .hero {
    padding: 58px 0 66px;
  }

  .hero h1 {
    font-size: 1.9rem;
    letter-spacing: 1px;
  }

  .hero .lead {
    font-size: 1rem;
  }

  .site-header .nav {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .site-header .menu {
    justify-content: center;
  }

  .site-header .menu a {
    padding: 5px 10px;
    font-size: 0.88rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.45rem;
  }

  .page-title {
    font-size: 1.6rem;
  }

  main.container {
    padding-top: 36px;
    padding-bottom: 44px;
  }
}

@media (min-width: 641px) and (max-width: 900px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}