/* ==========================================================================
   非遗文化智能数字展示平台 —— 全局样式
   设计语言：平面无透视 / 米棕褐色系 / 1px 描边 + 圆角 + 虚线关联线
   依据：06-界面设计说明.md「3.1 首页」
   ========================================================================== */

:root {
  --bg-color: #F8F3E9;
  --card-bg: #FBF7EF;
  --text-primary: #3A2A1F;
  --text-secondary: #7A6553;
  --text-muted: #A08B76;
  --accent-color: #8B5A2B;
  --accent-soft: #A9743F;
  --border-light: #D9C7B0;
  --border-dashed: #B8A68F;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-tag: 4px;
  --transition-base: all 0.2s ease;
  --shadow-pop: 0 12px 40px rgba(58, 42, 31, 0.14);

  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong, "SimSun", serif;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --level-national: #8B5A2B;
  --level-province: #7A8B5A;
  --level-city: #7A6553;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

body {
  background: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  overflow: hidden;
  /* 页面切换 0.3s 淡入淡出 */
  opacity: 0;
  transition: opacity 0.3s ease;
}
body.is-ready { opacity: 1; }

h1, h2, h3, h4 { margin: 0; font-weight: 500; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; font-size: inherit; }
img { display: block; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 4px; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- 页面骨架 ---------- */
.page {
  position: relative;
  width: 100vw;
  height: 100vh;
  background: var(--bg-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---------- 页头：左上角返回入口 + 顶部居中标题 ---------- */
.page-head {
  position: relative;
  flex-shrink: 0;
  height: 104px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 200px;
}

.back-link {
  position: absolute;
  left: 60px;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 10px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-btn);
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition-base);
}
.back-link:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}
.back-link__icon { font-size: 15px; line-height: 1; }
.back-link:hover .back-link__icon { transform: translateX(-2px); }
.back-link__icon { transition: var(--transition-base); }

.page-title {
  font-family: var(--font-serif);
  font-size: 26px;
  letter-spacing: 2px;
  color: var(--text-primary);
}
.page-desc {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

/* 表单页头（首页）：平台名 + 面包屑下划线 */
.page-head--index {
  align-items: flex-start;
  justify-content: center;
  height: 104px;
  padding: 0 60px;
  gap: 4px;
}
.brand {
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 1.5px;
}
.crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-secondary);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent-color);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 24px;
  border: 1px solid var(--accent-color);
  border-radius: var(--radius-btn);
  background: transparent;
  color: var(--accent-color);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition-base);
}
.btn:hover { background: var(--accent-color); color: #fff; }
.btn--ghost {
  border-color: var(--border-light);
  color: var(--text-secondary);
}
.btn--ghost:hover {
  background: transparent;
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* 文字按钮 */
.text-btn {
  border: none;
  background: none;
  padding: 0;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}
.text-btn:hover { color: var(--accent-color); border-bottom-color: var(--accent-color); }

/* ---------- 筛选标签 ---------- */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-tag);
  background: #F0E8DB;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition-base);
  user-select: none;
}
.tag:hover { color: var(--accent-color); }
.tag.active { background: var(--accent-color); color: #fff; }

/* 级别标签 */
.level-tag {
  display: inline-block;
  font-size: 12px;
  line-height: 1.5;
  color: var(--accent-color);
  background: rgba(139, 90, 43, 0.1);
  padding: 2px 8px;
  border-radius: var(--radius-tag);
  width: fit-content;
}
.level-tag[data-level="省级"] { color: var(--level-province); background: rgba(122, 139, 90, 0.12); }
.level-tag[data-level="市级"] { color: var(--level-city); background: rgba(122, 101, 83, 0.12); }

/* ---------- 卡片 ---------- */
.card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  background: var(--card-bg);
}

/* ---------- 遮罩与浮层 ---------- */
.mask {
  position: fixed;
  inset: 0;
  background: rgba(58, 42, 31, 0.42);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  z-index: 90;
}
.mask.show { opacity: 1; visibility: visible; }

.modal {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -48%) scale(0.98);
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-pop);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.28s ease, transform 0.28s ease, visibility 0.28s ease;
  z-index: 1400;
  overflow: hidden;
}
.modal.show { opacity: 1; visibility: visible; transform: translate(-50%, -50%) scale(1); }

.modal__close {
  position: absolute;
  right: 14px;
  top: 14px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-light);
  border-radius: 50%;
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: var(--transition-base);
  z-index: 2;
}
.modal__close:hover { border-color: var(--accent-color); color: var(--accent-color); }

/* ---------- 标签页 ---------- */
.tabs {
  display: flex;
  gap: 24px;
  border-bottom: 1px solid var(--border-light);
}
.tab {
  position: relative;
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-base);
  background: none;
  border: none;
}
.tab:hover { color: var(--accent-color); }
.tab.active { color: var(--accent-color); }
.tab.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--accent-color);
}

/* ---------- 说明性小标题（档案式编号） ---------- */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--accent-soft);
}
.eyebrow::before {
  content: '';
  width: 26px;
  height: 1px;
  background: var(--accent-soft);
}


/* ---------- 工具类 ---------- */
.is-hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .page-head { padding: 0 24px; height: 88px; }
  .back-link { left: 24px; }
  .page-title { font-size: 22px; }
}