/* ============================================================
   塘朗山自然教育 · 珊瑚橙主题
   设计令牌全部走 CSS 变量，暗色模式仅覆盖变量，组件零改动
   ============================================================ */
:root {
  --coral: #FF7A45;
  --coral-dark: #E85D23;
  --coral-light: #FFE7DB;
  --coral-soft: #FFF1E9;
  --forest: #2E7D5B;
  --forest-dark: #1F5C41;
  --forest-light: #E3F2EC;
  --ink: #2B2420;
  --muted: #7A6F67;
  --bg: #FFF9F5;
  --bg-alt: #FFF3EC;
  --card: #FFFFFF;
  --border: #F1E4DA;
  --shadow: 0 8px 28px rgba(255, 122, 69, 0.14);
  --shadow-sm: 0 3px 12px rgba(43, 36, 32, 0.06);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1160px;
  --header-h: 64px;
}

html[data-theme="dark"] {
  --coral: #FF9166;
  --coral-dark: #FF7A45;
  --coral-light: #3A241A;
  --coral-soft: #2A1B14;
  --forest: #5FB98E;
  --forest-dark: #7FCBA4;
  --forest-light: #1C2C25;
  --ink: #F3EAE3;
  --muted: #B6A89E;
  --bg: #16120F;
  --bg-alt: #1F1813;
  --card: #211A15;
  --border: #322519;
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 3px 12px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}

a { color: var(--coral-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  height: var(--header-h);
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 28px;
  height: 28px;
  display: block;
  flex: none;
  filter: drop-shadow(0 2px 4px rgba(255,122,69,.3));
}
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-text strong { font-size: 18px; letter-spacing: .5px; }
.brand-text small { font-size: 11px; color: var(--muted); letter-spacing: 3px; }

.main-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}
.main-nav a {
  color: var(--ink);
  font-size: 14.5px;
  padding: 8px 12px;
  border-radius: 999px;
  transition: background .2s, color .2s;
  white-space: nowrap;
}
.main-nav a:hover { background: var(--coral-soft); text-decoration: none; }
.main-nav a.active {
  background: var(--coral);
  color: #fff;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 50%;
  cursor: pointer;
  font-size: 17px;
  display: grid; place-items: center;
  transition: transform .15s, border-color .2s;
}
.icon-btn:hover { border-color: var(--coral); transform: translateY(-1px); }
.nav-toggle { display: none; }

/* ---------- 主区域 ---------- */
.app-main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 20px 60px;
  min-height: calc(100vh - var(--header-h) - 200px);
  outline: none;
}
.section { margin-bottom: 44px; }
.section-head { margin-bottom: 18px; }
.section-head h2 {
  font-size: 24px;
  margin: 0 0 4px;
  display: flex; align-items: center; gap: 10px;
}
.section-head h2 .tag {
  font-size: 12px; font-weight: 600;
  color: var(--coral-dark);
  background: var(--coral-light);
  padding: 2px 10px; border-radius: 999px;
}
.section-head p { color: var(--muted); margin: 0; font-size: 14.5px; }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative;
  border-radius: 28px;
  overflow: hidden;
  padding: 56px 40px;
  color: #fff;
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(255,255,255,.25), transparent),
    linear-gradient(135deg, var(--forest) 0%, var(--coral) 130%);
  box-shadow: var(--shadow);
}
.hero h1 { font-size: 40px; margin: 0 0 12px; line-height: 1.15; }
.hero p { font-size: 17px; max-width: 640px; opacity: .95; margin: 0 0 24px; }
.hero .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .leaf-deco { position: absolute; right: -30px; bottom: -40px; font-size: 200px; opacity: .12; transform: rotate(-12deg); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px;
  border-radius: 999px;
  font-size: 15px; font-weight: 600;
  border: none; cursor: pointer;
  transition: transform .15s, box-shadow .2s, background .2s;
  text-decoration: none;
}
.btn-primary { background: #fff; color: var(--coral-dark); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,.18); text-decoration: none; }
.btn-ghost { background: rgba(255,255,255,.16); color: #fff; border: 1px solid rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.28); text-decoration: none; }
.btn-coral { background: var(--coral); color: #fff; }
.btn-coral:hover { background: var(--coral-dark); transform: translateY(-2px); text-decoration: none; }
.btn-outline { background: transparent; color: var(--coral-dark); border: 1.5px solid var(--coral); }
.btn-outline:hover { background: var(--coral-soft); text-decoration: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-sm { padding: 7px 14px; font-size: 13px; }

/* 数据概览 */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 26px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.stat-card .num { font-size: 30px; font-weight: 700; color: var(--coral-dark); }
.stat-card .lbl { color: var(--muted); font-size: 13.5px; margin-top: 2px; }

/* 模块入口卡 */
.module-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.module-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  cursor: pointer;
  transition: transform .18s, box-shadow .2s, border-color .2s;
  box-shadow: var(--shadow-sm);
}
.module-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--coral); }
.module-card .ico { font-size: 34px; }
.module-card h3 { margin: 12px 0 6px; font-size: 18px; }
.module-card p { color: var(--muted); font-size: 14px; margin: 0; }

/* ---------- 通用卡片/网格 ---------- */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .18s, box-shadow .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card .card-body { padding: 16px 18px; }
.card h3 { margin: 0 0 6px; font-size: 16.5px; }
.card .meta { color: var(--muted); font-size: 13px; }

.chip {
  display: inline-block;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--coral-light);
  color: var(--coral-dark);
  font-weight: 600;
}
.chip.forest { background: var(--forest-light); color: var(--forest-dark); }
.chip.muted { background: var(--bg-alt); color: var(--muted); }

/* 物种封面（emoji 占位图） */
.species-cover {
  height: 140px;
  display: grid; place-items: center;
  font-size: 64px;
  background: linear-gradient(135deg, var(--coral-soft), var(--forest-light));
}
.species-card .card-body { display: flex; flex-direction: column; gap: 6px; }
.species-card .latin { font-style: italic; color: var(--muted); font-size: 12.5px; }

/* ---------- 工具栏 / 筛选 ---------- */
.toolbar {
  display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
  margin-bottom: 20px;
}
.search {
  flex: 1; min-width: 220px;
  display: flex; align-items: center; gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 16px;
}
.search input { border: none; outline: none; background: transparent; flex: 1; font-size: 14.5px; color: var(--ink); }
.filter-group { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  padding: 8px 15px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13.5px;
  transition: all .18s;
}
.filter-btn:hover { border-color: var(--coral); color: var(--coral-dark); }
.filter-btn.active { background: var(--coral); color: #fff; border-color: var(--coral); font-weight: 600; }

select, input[type="text"], input[type="date"], textarea {
  font-family: inherit;
  font-size: 14.5px;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  outline: none;
}
select:focus, input:focus, textarea:focus { border-color: var(--coral); }

/* ---------- 互动地图 ---------- */
.map-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}
.map-svg { width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
.map-point { cursor: pointer; }
.map-pin { transition: transform .18s ease; transform-box: fill-box; transform-origin: center; }
.map-point:hover .map-pin { transform: scale(1.15); }
.map-point circle.halo { animation: pulse 2.4s infinite; transform-origin: center; }
@keyframes pulse { 0%{opacity:.55;} 50%{opacity:.15;} 100%{opacity:.55;} }

.map-side { display: grid; grid-template-columns: 1.4fr 1fr; gap: 18px; align-items: start; }
.map-detail {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  min-height: 220px;
}
.map-detail h3 { margin: 0 0 6px; }
.map-legend { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.map-legend span { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.dot { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }

/* ---------- 课程预约 ---------- */
.course-card .card-body { display: flex; flex-direction: column; gap: 10px; }
.course-meta { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.capacity-bar { height: 8px; background: var(--bg-alt); border-radius: 999px; overflow: hidden; }
.capacity-bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--coral), var(--forest)); }
.booked-tag { font-size: 12px; color: var(--forest-dark); font-weight: 600; }

/* ---------- 学习资源 ---------- */
.resource-card .res-cover {
  height: 120px; display: grid; place-items: center; font-size: 50px;
  background: linear-gradient(135deg, var(--forest-light), var(--coral-soft));
}
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }

/* ---------- 社区 ---------- */
.obs-form {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
  display: grid; gap: 14px; max-width: 560px;
}
.obs-form label { font-size: 13.5px; font-weight: 600; color: var(--muted); display: block; margin-bottom: 5px; }
.obs-feed { display: grid; gap: 16px; }
.obs-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow-sm);
}
.obs-item .obs-top { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.avatar { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; font-size: 20px; background: var(--coral-soft); }
.obs-item .who { font-weight: 600; }
.obs-item .when { font-size: 12px; color: var(--muted); }
.obs-item .obs-body { font-size: 14.5px; }
.obs-item .obs-foot { margin-top: 10px; display: flex; gap: 14px; font-size: 13px; color: var(--muted); }
.obs-item .obs-foot b { color: var(--coral-dark); }

/* ---------- 安全科普 ---------- */
.safety-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.safety-card { background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--coral); border-radius: var(--radius-sm); padding: 16px 18px; box-shadow: var(--shadow-sm); }
.safety-card h3 { margin: 0 0 8px; font-size: 16px; display: flex; gap: 8px; align-items: center; }
.safety-card ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.safety-card ul li { margin: 4px 0; }

/* ---------- 教师/志愿者 ---------- */
.zone-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.zone-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm); }
.zone-card .ico { font-size: 30px; }
.zone-card h3 { margin: 10px 0 6px; }
.zone-card p { color: var(--muted); font-size: 14px; }
.dl-item { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-bottom: 1px dashed var(--border); }
.dl-item:last-child { border-bottom: none; }
.dl-item .name { font-weight: 600; }
.dl-item .sub { font-size: 12.5px; color: var(--muted); }
.shift { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 10px; }
.shift .date { font-weight: 700; color: var(--coral-dark); min-width: 86px; }
.shift .info { flex: 1; font-size: 14px; }
.shift .seats { font-size: 12.5px; color: var(--muted); }

/* ---------- 详情弹窗 ---------- */
.modal-mask {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(20,12,8,.5);
  display: grid; place-items: center;
  padding: 20px;
  animation: fade .2s ease;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--card);
  border-radius: var(--radius);
  max-width: 520px; width: 100%;
  max-height: 86vh; overflow: auto;
  box-shadow: var(--shadow);
  animation: pop .22s ease;
}
@keyframes pop { from { transform: translateY(16px) scale(.98); opacity: 0; } to { transform: none; opacity: 1; } }
.modal .modal-cover { height: 160px; display: grid; place-items: center; font-size: 80px; background: linear-gradient(135deg, var(--coral-soft), var(--forest-light)); }
.modal .modal-body { padding: 22px; }
.modal .modal-body h2 { margin: 0 0 4px; }
.modal .modal-body .latin { font-style: italic; color: var(--muted); margin-bottom: 12px; }
.modal .close-x { position: absolute; top: 14px; right: 16px; background: rgba(255,255,255,.85); border: none; font-size: 22px; cursor: pointer; border-radius: 50%; width: 36px; height: 36px; }
.modal-wrap { position: relative; }

/* ---------- 空状态 / 提示 ---------- */
.empty { text-align: center; color: var(--muted); padding: 50px 20px; font-size: 15px; }
.empty .big { font-size: 48px; display: block; margin-bottom: 10px; }

.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: #fff; padding: 12px 22px; border-radius: 999px;
  font-size: 14px; opacity: 0; pointer-events: none; transition: all .3s; z-index: 200;
  box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 36px 20px; display: grid; grid-template-columns: 1.4fr 1fr 1.2fr; gap: 28px; }
.footer-col h4 { margin: 0 0 12px; font-size: 15px; }
.footer-col p { color: var(--muted); font-size: 13.5px; margin: 0 0 8px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col ul li { margin: 6px 0; font-size: 14px; }
.muted { color: var(--muted); }

/* ---------- 响应式 ---------- */
@media (max-width: 920px) {
  .module-grid, .grid-3, .zone-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .map-side { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .main-nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--card); border-bottom: 1px solid var(--border);
    padding: 8px; display: none; box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
  .main-nav a { border-radius: var(--radius-sm); }
  .nav-toggle { display: grid; }
  .module-grid, .grid-2, .grid-3, .grid-4, .safety-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 38px 24px; }
  .hero h1 { font-size: 30px; }
  .app-main { padding: 18px 14px 48px; }
}