/* ─────────────────────────────────────────────────
   base.css · 跨主题通用骨架样式（不含品牌色）
   品牌色 / 字体 / 装饰元素 由 themes/<n>.css 提供
────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body, system-ui, -apple-system, "Helvetica Neue", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text, #1a1a1a);
  background: var(--color-bg, #faf7f1);
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display, serif);
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 0.5em;
}

a { color: var(--color-accent, #b8860b); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font: inherit; cursor: pointer; }

/* ─────── L1 Gate ─────── */

dialog#gate {
  border: none;
  padding: 0;
  background: transparent;
  max-width: 100%;
  max-height: 100%;
  margin: auto;
}
dialog#gate::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
}
.gate-card {
  background: var(--color-card, #fff);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  max-width: 480px;
  width: calc(100vw - 2rem);
  margin: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
}
.gate-card header { text-align: center; margin-bottom: 1.5rem; }
.gate-card h1 { margin: 0 0 0.3em; font-size: 1.75rem; color: var(--color-accent, #b8860b); }
.gate-card header p { margin: 0; opacity: 0.7; font-size: 0.95rem; }
.gate-body { font-size: 0.95rem; margin: 0 0 1.5rem; color: var(--color-text-soft, #444); }
.gate-agree {
  display: flex; align-items: center; gap: 0.6rem;
  margin-bottom: 1.2rem;
  font-size: 0.92rem;
  user-select: none;
}
.gate-agree input { width: 18px; height: 18px; cursor: pointer; }
.btn-primary {
  display: block; width: 100%;
  background: var(--color-accent, #b8860b);
  color: var(--color-accent-text, #fff);
  border: none; border-radius: 8px;
  padding: 0.85rem 1rem;
  font-size: 1rem; font-weight: 600;
  transition: transform 0.15s;
}
.btn-primary:hover { transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

/* ─────── L2 Topbar ─────── */

.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  background: var(--color-topbar, rgba(20, 14, 8, 0.96));
  color: var(--color-topbar-text, #f5e6c5);
  border-bottom: 1px solid var(--color-topbar-border, rgba(255, 215, 130, 0.2));
  backdrop-filter: blur(8px);
  font-size: 0.92rem;
}
.topbar-left { display: flex; align-items: center; gap: 0.5rem; min-width: 0; flex-wrap: wrap; }
.topbar-oko { font-weight: 700; letter-spacing: 0.05em; color: var(--color-accent, #d4a95f); }
.topbar-sep { opacity: 0.4; }
.topbar-store { font-weight: 600; }
.topbar-period { opacity: 0.85; }
.btn-link {
  background: transparent;
  border: 1px solid var(--color-topbar-text, #f5e6c5);
  color: inherit;
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  font-size: 0.88rem;
}
.btn-link:hover { background: rgba(255, 255, 255, 0.1); }

/* ─────── L3 Layout（侧栏 + 内容）─────── */

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
  gap: 2rem;
}
@media (max-width: 768px) {
  .layout { grid-template-columns: 1fr; padding: 1rem; gap: 1rem; }
  .sidebar { position: static; }
}

.sidebar {
  position: sticky; top: 4.5rem;
  align-self: start;
  font-size: 0.92rem;
}
.sidebar-nav { display: flex; flex-direction: column; gap: 0.25rem; }
.sidebar-nav details {
  border-bottom: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  padding: 0.5rem 0;
}
.sidebar-nav summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.25rem 0;
  list-style: none;
  display: flex; justify-content: space-between;
}
.sidebar-nav summary::-webkit-details-marker { display: none; }
.sidebar-nav summary::after {
  content: '▸';
  transition: transform 0.2s;
  opacity: 0.5;
}
.sidebar-nav details[open] summary::after { transform: rotate(90deg); }
.sidebar-nav ul {
  list-style: none;
  margin: 0.25rem 0 0;
  padding: 0 0 0 0.5rem;
}
.sidebar-nav li a {
  display: flex; justify-content: space-between;
  padding: 0.3rem 0;
  color: var(--color-text-soft, #555);
  font-size: 0.88rem;
}
.sidebar-nav li a:hover { color: var(--color-accent, #b8860b); text-decoration: none; }
.sidebar-nav li .count { opacity: 0.5; font-size: 0.82rem; }

.sidebar-favorites {
  display: flex; align-items: center; gap: 0.5rem;
  margin-top: 1.5rem;
  padding: 0.6rem 0.75rem;
  background: var(--color-card, #fff);
  border: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  border-radius: 8px;
  color: inherit;
  font-weight: 600;
}
.sidebar-favorites:hover { text-decoration: none; transform: translateY(-1px); transition: transform 0.15s; }
.favorites-count {
  margin-left: auto;
  background: var(--color-accent, #b8860b);
  color: var(--color-accent-text, #fff);
  border-radius: 999px;
  font-size: 0.75rem;
  padding: 0.1rem 0.55rem;
  min-width: 1.4rem;
  text-align: center;
}

/* ─────── Hero ─────── */

.hero {
  padding: 2rem 1.5rem;
  background: var(--color-card, #fff);
  border-radius: 12px;
  border: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  margin-bottom: 2rem;
  text-align: center;
}
.hero-title { font-size: 2rem; color: var(--color-accent, #b8860b); margin-bottom: 0.3em; }
.hero-subtitle { margin: 0 0 1rem; opacity: 0.7; }
.hero-stats {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 1.5rem;
  margin-top: 1rem;
  font-size: 0.92rem;
}
.hero-stats .stat { display: flex; align-items: center; gap: 0.4rem; }

/* ─────── 月份分档 ─────── */

.month {
  margin-bottom: 2rem;
  background: var(--color-card, #fff);
  border-radius: 12px;
  border: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  overflow: hidden;
}
.month-header {
  cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.25rem;
  font-family: var(--font-display, serif);
  font-size: 1.25rem;
  font-weight: 600;
  list-style: none;
  background: var(--color-card-header, rgba(0, 0, 0, 0.02));
  user-select: none;
}
.month-header::-webkit-details-marker { display: none; }
.month-header::after { content: '▾'; transition: transform 0.2s; }
details:not([open]) .month-header::after { transform: rotate(-90deg); }
.month-header .month-summary { opacity: 0.7; font-size: 0.9rem; font-weight: 400; margin-left: auto; margin-right: 0.5rem; }
.month-body { padding: 1.25rem; }

.type-group { margin-bottom: 1.5rem; }
.type-group:last-child { margin-bottom: 0; }
.type-group-title {
  font-size: 1rem; font-weight: 600;
  margin: 0 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  display: flex; align-items: center; gap: 0.4rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

/* ─────── 素材卡片 ─────── */

.card {
  background: var(--color-card, #fff);
  border: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  border-radius: 10px;
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform 0.15s, box-shadow 0.15s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08); }

.card-media {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--color-skeleton, #eee);
  overflow: hidden;
}
.card-media img, .card-media video {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.card-type-badge {
  position: absolute; top: 0.5rem; left: 0.5rem;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  backdrop-filter: blur(4px);
}
.card-favorite-btn {
  position: absolute; top: 0.5rem; right: 0.5rem;
  background: rgba(0, 0, 0, 0.4);
  border: none;
  color: #fff;
  width: 32px; height: 32px;
  border-radius: 50%;
  font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
  transition: transform 0.15s, background 0.2s;
}
.card-favorite-btn:hover { transform: scale(1.15); }
.card-favorite-btn[data-active="true"] {
  background: var(--color-accent, #b8860b);
}

.card-body { padding: 0.85rem 1rem; flex: 1; display: flex; flex-direction: column; }
.card-caption {
  font-size: 0.9rem;
  margin: 0 0 0.6rem;
  white-space: pre-wrap;
}
.card-time {
  font-size: 0.78rem;
  opacity: 0.65;
  margin: 0 0 0.6rem;
}
.card-time strong { color: var(--color-accent, #b8860b); }
.card-hashtags {
  font-size: 0.78rem;
  color: var(--color-accent, #b8860b);
  word-break: break-all;
  margin: 0 0 0.75rem;
  opacity: 0.85;
}

.card-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: auto; }
.btn-action {
  background: var(--color-action-bg, rgba(0, 0, 0, 0.05));
  border: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  color: inherit;
  padding: 0.35rem 0.65rem;
  border-radius: 5px;
  font-size: 0.78rem;
  flex: 1; min-width: 70px;
  transition: background 0.15s;
}
.btn-action:hover { background: var(--color-action-bg-hover, rgba(0, 0, 0, 0.1)); }

.card-share-row {
  display: flex; gap: 0.3rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.btn-share {
  flex: 1; min-width: 36px;
  background: var(--color-card-header, rgba(0, 0, 0, 0.04));
  border: 1px solid var(--color-border, rgba(0, 0, 0, 0.08));
  padding: 0.35rem 0;
  border-radius: 5px;
  font-size: 0.78rem;
  text-align: center;
}
.btn-share:hover { background: var(--color-accent, #b8860b); color: var(--color-accent-text, #fff); }

/* ─────── Toast ─────── */

.toast {
  position: fixed;
  bottom: 1.5rem; left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.85);
  color: #fff;
  padding: 0.7rem 1.5rem;
  border-radius: 999px;
  font-size: 0.88rem;
  z-index: 100;
  animation: toast-in 0.2s, toast-out 0.3s 2.2s forwards;
}
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 10px); } }
@keyframes toast-out { to { opacity: 0; transform: translate(-50%, 10px); } }

/* ─────── Favorites section ─────── */

.favorites-section { margin-top: 3rem; }
.favorites-section h2 { color: var(--color-accent, #b8860b); margin-bottom: 1rem; }
.favorites-section:empty { display: none; }

/* ─────── Empty state ─────── */

.empty-state {
  padding: 3rem 1rem;
  text-align: center;
  opacity: 0.55;
  font-style: italic;
}