/* Trip Evergreen & Terracotta Design Tokens */
:root {
  --font-display: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Plus Jakarta Sans", "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;

  /* Signature Trip 配色体系 */
  --primary: #1B4332;         /* 苍林墨绿 */
  --primary-accent: #2D6A4F;  /* 翡翠翠绿 */
  --primary-light: #52B788;   /* 薄荷碧玉 */
  --primary-bg: #E8F5E9;      /* 嫩竹浅青 */
  --accent: #E76F51;          /* 陶土珊瑚橙 */
  --accent-gold: #D4A373;     /* 暖沙金 */

  --bg: #F4F6F8;
  --card-bg: #FFFFFF;
  --text-main: #111827;
  --text-muted: #4B5563;
  --text-dim: #9CA3AF;
  --border: #E5E7EB;
  --border-hover: #D1DBD4;

  /* 板块主题色 */
  --c-notes: #2563EB;
  --c-notes-bg: #EFF6FF;
  --c-notes-border: #BFDBFE;

  --c-travel: #2D6A4F;
  --c-travel-bg: #E8F5E9;
  --c-travel-border: #A7D7C5;

  --c-stock: #E76F51;
  --c-stock-bg: #FDF2E9;
  --c-stock-border: #FADBD8;

  --c-books: #D97706;
  --c-books-bg: #FFFBEB;
  --c-books-border: #FDE68A;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 25px rgba(27, 67, 50, 0.08);
  --shadow-float: 0 20px 45px rgba(27, 67, 50, 0.22);
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.65;
}

h1, h2, h3, .article-title, .lock-title, .subpage-title, .plan-title {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

.path-indicator, .node-tag, .step-tag, code, .step-num-badge, .flight-time strong {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

/* 顶部导航 Header */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
}

.header-inner {
  max-width: 1020px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

nav.tree-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  background: #E5E9E7;
  padding: 4px;
  border-radius: var(--radius-pill);
  overflow-x: auto;
}

nav.tree-nav::-webkit-scrollbar { display: none; }

.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 7px 15px;
  font-size: 0.88rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 5px;
}

.nav-btn:hover { color: var(--primary-accent); }

.nav-btn.active {
  background: #FFFFFF;
  color: var(--primary-accent);
  box-shadow: 0 2px 8px rgba(27, 67, 50, 0.08);
}

.btn-lock {
  background: #FFFFFF;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-lock:hover {
  background: var(--primary-bg);
  color: var(--primary-accent);
  border-color: rgba(45, 106, 79, 0.3);
}

.btn-share {
  background: var(--primary-bg);
  border: 1px solid rgba(45, 106, 79, 0.3);
  color: var(--primary-accent);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
}

.btn-share:hover {
  background: #D8F3DC;
  border-color: var(--primary-accent);
  transform: translateY(-1px);
}

.btn-share:active {
  transform: translateY(0);
}

/* 主体容器 */
main.main-container {
  max-width: 1020px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 16px 60px 16px;
  flex: 1;
}

/* 页脚 */
footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  background: #FFFFFF;
  margin-top: auto;
}