/* ============================================================
 * liquid-glass.css — 全局液态玻璃样式（基于 liquid-glass-studio 视觉语言）
 *
 * 设计令牌(:root) + 玻璃组件类 + WebGL/backdrop-filter 降级
 * 页面结构约定：
 *   <canvas id="lg-canvas" class="lg-canvas" data-liquid-glass></canvas>
 *   <div class="lg-scene"> ... 页面内容(玻璃面板用 .glass) ... </div>
 * ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --lg-radius-sm: 10px;
  --lg-radius: 16px;
  --lg-radius-lg: 24px;
  --lg-blur: 18px;
  --lg-saturate: 1.45;
  --lg-border: 1px solid rgba(255, 255, 255, 0.35);
  --lg-border-strong: 1px solid rgba(255, 255, 255, 0.55);
  --lg-shadow: 0 8px 32px rgba(31, 38, 135, 0.14), 0 2px 8px rgba(31, 38, 135, 0.06);
  --lg-shadow-lg: 0 20px 60px rgba(31, 38, 135, 0.22), 0 4px 16px rgba(31, 38, 135, 0.08);
  --lg-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.55);
  --lg-tint: linear-gradient(135deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.22));
  --lg-tint-strong: linear-gradient(135deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.45));
  --lg-tint-dark: linear-gradient(135deg, rgba(30, 41, 75, 0.6), rgba(15, 23, 42, 0.42));
  --lg-text: #16213e;
  --lg-text-soft: #4a5578;
  --lg-accent: #5b7cfa;
  --lg-accent-2: #8b5cf6;
  --lg-danger: #f43f5e;
  --lg-success: #10b981;
  --lg-warning: #f59e0b;
  --lg-bg-fallback: linear-gradient(135deg, #eef3ff, #dfe9fb 55%, #cfdcf5);
}

[data-theme="dark"] {
  --lg-border: 1px solid rgba(255, 255, 255, 0.14);
  --lg-border-strong: 1px solid rgba(255, 255, 255, 0.24);
  --lg-shadow: 0 8px 32px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.25);
  --lg-shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55), 0 4px 16px rgba(0, 0, 0, 0.3);
  --lg-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.12);
  --lg-tint: linear-gradient(135deg, rgba(44, 58, 94, 0.6), rgba(16, 24, 40, 0.5));
  --lg-tint-strong: linear-gradient(135deg, rgba(51, 65, 108, 0.72), rgba(30, 41, 75, 0.6));
  --lg-text: #e7ecff;
  --lg-text-soft: #9aa7cf;
  --lg-bg-fallback: linear-gradient(135deg, #101828, #1c2942 55%, #2c3a5e);
}

/* ---------- 场景与画布 ---------- */
.lg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
.lg-scene {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  background: var(--lg-bg-fallback);
}
body.lg-webgl .lg-scene { background: transparent; } /* WebGL 画布提供背景 */

/* ---------- 玻璃基础 ---------- */
.glass {
  background: var(--lg-tint);
  -webkit-backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-saturate));
  backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-saturate));
  border: var(--lg-border);
  border-radius: var(--lg-radius);
  box-shadow: var(--lg-shadow);
}
.glass-card {
  background: var(--lg-tint);
  -webkit-backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-saturate));
  backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-saturate));
  border: var(--lg-border);
  border-radius: var(--lg-radius);
  box-shadow: var(--lg-shadow);
  padding: 20px;
}
.glass-pane {
  background: var(--lg-tint-strong);
  -webkit-backdrop-filter: blur(22px) saturate(1.6);
  backdrop-filter: blur(22px) saturate(1.6);
  border: var(--lg-border-strong);
  border-radius: var(--lg-radius-lg);
  box-shadow: var(--lg-shadow-lg), var(--lg-highlight);
}
.glass-nav {
  background: var(--lg-tint-strong);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  backdrop-filter: blur(20px) saturate(1.6);
  border-bottom: var(--lg-border);
  box-shadow: 0 4px 24px rgba(31, 38, 135, 0.1);
}
.glass-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: rgba(255, 255, 255, 0.5);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  backdrop-filter: blur(14px) saturate(1.3);
  border: var(--lg-border);
  border-radius: var(--lg-radius);
  overflow: hidden;
}
[data-theme="dark"] .glass-table { background: rgba(16, 24, 40, 0.55); }
.glass-table th {
  background: rgba(255, 255, 255, 0.4);
  text-align: left;
  padding: 12px 14px;
  font-weight: 600;
  color: var(--lg-text);
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
}
.glass-table td { padding: 11px 14px; border-bottom: 1px solid rgba(120, 130, 180, 0.12); color: var(--lg-text); }
.glass-table tr:last-child td { border-bottom: none; }
.glass-table tbody tr:hover { background: rgba(255, 255, 255, 0.35); }

/* ---------- 按钮 ---------- */
.glass-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 999px;
  border: var(--lg-border);
  background: var(--lg-tint-strong);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  backdrop-filter: blur(12px) saturate(1.4);
  color: var(--lg-text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  box-shadow: 0 2px 10px rgba(31, 38, 135, 0.12);
}
.glass-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(31, 38, 135, 0.2); }
.glass-btn.is-primary {
  background: linear-gradient(135deg, rgba(91, 124, 250, 0.9), rgba(139, 92, 246, 0.85));
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}
.glass-btn.is-danger { color: var(--lg-danger); border-color: rgba(244, 63, 94, 0.35); }
.glass-btn.is-ghost { background: transparent; box-shadow: none; }
.glass-btn.is-sm { padding: 5px 12px; font-size: 13px; }
.glass-btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

/* ---------- 表单 ---------- */
.glass-input, .glass-select, .glass-textarea {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--lg-radius-sm);
  border: var(--lg-border);
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: var(--lg-text);
  font-size: 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}
[data-theme="dark"] .glass-input, [data-theme="dark"] .glass-select, [data-theme="dark"] .glass-textarea {
  background: rgba(16, 24, 40, 0.6);
}
.glass-input:focus, .glass-select:focus, .glass-textarea:focus {
  border-color: var(--lg-accent);
  box-shadow: 0 0 0 3px rgba(91, 124, 250, 0.2);
}
.glass-input::placeholder { color: var(--lg-text-soft); }
.glass-label { display: block; font-size: 13px; font-weight: 600; color: var(--lg-text); margin-bottom: 6px; }
.glass-hint { font-size: 12px; color: var(--lg-text-soft); margin-top: 4px; }
.glass-check, .glass-radio { accent-color: var(--lg-accent); width: 16px; height: 16px; }

/* ---------- 徽章 / 状态 ---------- */
.glass-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(91, 124, 250, 0.15);
  color: var(--lg-accent);
  border: 1px solid rgba(91, 124, 250, 0.3);
}
.glass-badge.is-success { background: rgba(16, 185, 129, 0.15); color: var(--lg-success); border-color: rgba(16, 185, 129, 0.3); }
.glass-badge.is-warning { background: rgba(245, 158, 11, 0.15); color: var(--lg-warning); border-color: rgba(245, 158, 11, 0.3); }
.glass-badge.is-danger { background: rgba(244, 63, 94, 0.15); color: var(--lg-danger); border-color: rgba(244, 63, 94, 0.3); }
.glass-badge.is-muted { background: rgba(120, 130, 180, 0.15); color: var(--lg-text-soft); border-color: rgba(120, 130, 180, 0.25); }

/* ---------- 分页 ---------- */
.glass-pagination ul { display: flex; gap: 6px; list-style: none; padding: 0; margin: 20px 0; flex-wrap: wrap; }
.glass-pagination a, .glass-pagination .current {
  display: inline-flex;
  min-width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: var(--lg-border);
  background: var(--lg-tint-strong);
  color: var(--lg-text);
  text-decoration: none;
  font-size: 14px;
}
.glass-pagination .current { background: linear-gradient(135deg, var(--lg-accent), var(--lg-accent-2)); color: #fff; border-color: transparent; }

/* ---------- 弹窗 / 提示 ---------- */
.glass-modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(15, 23, 42, 0.45);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center; justify-content: center;
}
.glass-modal-overlay.open { display: flex; }
.glass-modal { max-width: 560px; width: 92%; padding: 28px; max-height: 86vh; overflow: auto; }

.glass-alert {
  padding: 12px 16px;
  border-radius: var(--lg-radius-sm);
  margin-bottom: 14px;
  font-size: 14px;
  border: 1px solid;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.glass-alert.is-error { background: rgba(244, 63, 94, 0.12); color: var(--lg-danger); border-color: rgba(244, 63, 94, 0.3); }
.glass-alert.is-success { background: rgba(16, 185, 129, 0.12); color: var(--lg-success); border-color: rgba(16, 185, 129, 0.3); }
.glass-alert.is-info { background: rgba(91, 124, 250, 0.12); color: var(--lg-accent); border-color: rgba(91, 124, 250, 0.3); }
.glass-alert.is-warning { background: rgba(245, 158, 11, 0.12); color: var(--lg-warning); border-color: rgba(245, 158, 11, 0.3); }

/* ---------- 标签页 / 折叠 / 引用块 ---------- */
.tabs-nav { display: flex; gap: 4px; border-bottom: 1px solid rgba(120, 130, 180, 0.2); margin-bottom: 14px; flex-wrap: wrap; }
.tab-btn {
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--lg-text-soft);
  font-size: 14px;
  cursor: pointer;
  border-radius: var(--lg-radius-sm) var(--lg-radius-sm) 0 0;
  border-bottom: 2px solid transparent;
}
.tab-btn.active { color: var(--lg-accent); border-bottom-color: var(--lg-accent); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.accordion .acc-item { border: var(--lg-border); border-radius: var(--lg-radius-sm); margin-bottom: 8px; overflow: hidden; background: rgba(255, 255, 255, 0.4); }
.accordion summary { padding: 12px 16px; cursor: pointer; font-weight: 600; }
.accordion .acc-item > div { padding: 0 16px 14px; }
.callout { border-radius: var(--lg-radius-sm); padding: 12px 16px; margin: 14px 0; border: 1px solid; }
.callout-quote { background: rgba(120, 130, 180, 0.1); border-color: rgba(120, 130, 180, 0.25); }
.callout-tip { background: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.3); }
.callout-warning { background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.3); }
.callout-note { background: rgba(91, 124, 250, 0.1); border-color: rgba(91, 124, 250, 0.3); }
.spoiler { border: var(--lg-border); border-radius: var(--lg-radius-sm); padding: 10px 14px; margin: 10px 0; background: rgba(255, 255, 255, 0.35); }
.spoiler summary { cursor: pointer; font-weight: 600; }

/* ---------- 内容排版 ---------- */
.glass-prose { line-height: 1.85; color: var(--lg-text); font-size: 16px; }
.glass-prose h1, .glass-prose h2, .glass-prose h3, .glass-prose h4 { margin: 1.6em 0 0.7em; line-height: 1.35; }
.glass-prose h1 { font-size: 1.7em; } .glass-prose h2 { font-size: 1.42em; } .glass-prose h3 { font-size: 1.22em; }
.glass-prose p { margin: 0.9em 0; }
.glass-prose img { max-width: 100%; border-radius: var(--lg-radius-sm); }
.glass-prose a { color: var(--lg-accent); text-decoration: none; border-bottom: 1px solid rgba(91, 124, 250, 0.35); }
.glass-prose a:hover { border-bottom-color: var(--lg-accent); }
.glass-prose code { background: rgba(91, 124, 250, 0.12); border-radius: 5px; padding: 2px 6px; font-size: 0.9em; }
.glass-prose pre.code-block {
  background: rgba(15, 23, 42, 0.92);
  color: #dbe6ff;
  padding: 16px 18px;
  border-radius: var(--lg-radius-sm);
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.glass-prose pre.code-block code { background: transparent; padding: 0; color: inherit; }
.glass-prose blockquote {
  margin: 1em 0;
  padding: 4px 18px;
  border-left: 4px solid var(--lg-accent);
  background: rgba(91, 124, 250, 0.08);
  border-radius: 0 var(--lg-radius-sm) var(--lg-radius-sm) 0;
}
.glass-prose table { width: 100%; border-collapse: collapse; margin: 1em 0; }
.glass-prose th, .glass-prose td { border: 1px solid rgba(120, 130, 180, 0.25); padding: 8px 12px; }
.glass-prose th { background: rgba(255, 255, 255, 0.4); }
.glass-prose ul, .glass-prose ol { padding-left: 1.5em; margin: 0.8em 0; }
.glass-prose hr { border: none; border-top: 1px solid rgba(120, 130, 180, 0.25); margin: 1.8em 0; }

/* ---------- 表单提交按钮/搜索等通用 ---------- */
.gallery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin: 14px 0; }
.gallery-grid figure { margin: 0; }
.gallery-grid img { width: 100%; border-radius: var(--lg-radius-sm); }
.media-video, audio { width: 100%; border-radius: var(--lg-radius-sm); margin: 12px 0; }
.table-wrap { overflow-x: auto; }

/* ---------- 降级：无 WebGL2 或减少动态时 ---------- */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass, .glass-card, .glass-pane, .glass-nav, .glass-btn, .glass-table, .glass-input, .glass-select, .glass-textarea {
    background: rgba(255, 255, 255, 0.9);
  }
  [data-theme="dark"] .glass, [data-theme="dark"] .glass-card, [data-theme="dark"] .glass-pane,
  [data-theme="dark"] .glass-nav, [data-theme="dark"] .glass-btn,
  [data-theme="dark"] .glass-input, [data-theme="dark"] .glass-select, [data-theme="dark"] .glass-textarea {
    background: rgba(24, 32, 54, 0.92);
  }
}
body.lg-fallback .lg-canvas { display: none !important; }