/* ============================================================
   v2 视觉增强包（ACG 星港 / AI 启航站 / AI 进阶教室 共用）
   只做"增强"，依赖各站已有的 CSS 变量：--c1 --c2 --c3 --bg --panel --border --text...
   ============================================================ */

/* ---------- 1. 底噪与光泽 ---------- */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .045;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 2. 壁纸背景层 ---------- */
.wp-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  transition: opacity .7s var(--ease, ease);
  transform: scale(1.02);
}
.wp-layer::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg,
      color-mix(in srgb, var(--bg) 62%, transparent) 0%,
      color-mix(in srgb, var(--bg) 82%, transparent) 45%,
      color-mix(in srgb, var(--bg) 94%, transparent) 100%);
}
body.has-wp .wp-layer { opacity: var(--wp-opacity, .42); }
body.has-wp.wp-blur .wp-layer { filter: blur(3px) saturate(115%); }
body.has-wp::before { opacity: .35; }

.wp-caption {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 3;
  font-size: 11px;
  color: var(--text-faint);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 4px 11px;
  backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
body.has-wp:hover .wp-caption { opacity: .9; }

/* ---------- 3. 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(16px); }
.reveal.in { opacity: 1; transform: none; transition: opacity .55s var(--ease, ease), transform .55s var(--ease, ease); }

/* ---------- 4. 通用抛光 ---------- */
.card, .panel, .side-block, .toolbar, .hero {
  transition: transform .22s var(--ease, ease), border-color .22s var(--ease, ease), box-shadow .28s var(--ease, ease), background .22s;
}
.card:hover { box-shadow: var(--shadow-2); }

.icon-btn:active, .btn:active, .chip:active, .nav-item:active { transform: scale(.96); }

.pill-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 12px;
  color: var(--text-dim);
  background: var(--panel);
  border: 1px solid var(--border);
}
.pill b { color: var(--text); font-variant-numeric: tabular-nums; }
.pill.hot { color: #fff; border-color: transparent; background: linear-gradient(100deg, var(--c1), var(--c2)); }

.section-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 4px 2px 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: .5px;
}
.section-head::after { content: ""; flex: 1; height: 1px; background: linear-gradient(90deg, var(--border), transparent); }
.section-head .sh-sub { font-weight: 400; font-size: 11.5px; color: var(--text-faint); }

/* ---------- 5. 角色卡（壁纸馆） ---------- */
.chara-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
  gap: 12px;
}
.chara-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius, 16px);
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 14px;
  text-align: center;
  transition: transform .25s var(--ease, ease), box-shadow .3s var(--ease, ease);
  animation: cardIn .45s var(--ease, ease) both;
}
.chara-card::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto -10%;
  height: 130px;
  background: radial-gradient(60% 70% at 50% 0%, color-mix(in srgb, var(--cc, var(--c1)) 55%, transparent), transparent 70%);
  pointer-events: none;
}
.chara-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-2); }
.chara-avatar {
  position: relative;
  width: 76px;
  height: 76px;
  margin: 4px auto 10px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 30px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(140deg, var(--cc, var(--c1)), color-mix(in srgb, var(--cc, var(--c1)) 35%, #1a1a2e));
  box-shadow: 0 10px 26px color-mix(in srgb, var(--cc, var(--c1)) 40%, transparent), inset 0 -6px 14px rgba(0, 0, 0, .18);
  border: 2px solid color-mix(in srgb, #fff 26%, transparent);
}
.chara-card h4 { margin: 0 0 3px; font-size: 14.5px; }
.chara-card .chara-from { font-size: 11px; color: var(--text-faint); margin-bottom: 8px; }
.chara-card .chara-tags { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; margin-bottom: 10px; }
.chara-card .chara-tags i {
  font-style: normal;
  font-size: 10px;
  padding: 1px 7px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--cc, var(--c1)) 14%, transparent);
  color: color-mix(in srgb, var(--cc, var(--c1)) 80%, var(--text));
}
.chara-actions { display: flex; gap: 6px; }
.chara-actions button {
  flex: 1;
  padding: 6px 4px;
  border-radius: 8px;
  font-size: 11.5px;
  color: var(--text-dim);
  background: var(--panel-2, rgba(255, 255, 255, .08));
  border: 1px solid var(--border);
  transition: all .16s var(--ease, ease);
}
.chara-actions button:hover { color: #fff; border-color: transparent; background: linear-gradient(100deg, var(--cc, var(--c1)), var(--c2)); }
.chara-actions button.on { color: #fff; border-color: transparent; background: linear-gradient(100deg, var(--cc, var(--c1)), var(--c2)); }

/* ---------- 6. 壁纸网格 ---------- */
.wp-toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.wp-toolbar input {
  flex: 1;
  min-width: 150px;
  padding: 8px 13px;
  border-radius: 99px;
  font-size: 13px;
  background: var(--panel);
  border: 1px solid var(--border);
  outline: none;
}
.wp-toolbar input:focus { border-color: color-mix(in srgb, var(--c1) 55%, transparent); }
.wp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(216px, 1fr));
  gap: 12px;
}
.wp-item {
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel);
  aspect-ratio: 16 / 10;
  cursor: pointer;
  transition: transform .25s var(--ease, ease), box-shadow .3s var(--ease, ease);
}
.wp-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .5s var(--ease, ease); }
.wp-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); }
.wp-item:hover img { transform: scale(1.07); }
.wp-item .wp-ov {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  font-size: 11px;
  color: #fff;
  background: linear-gradient(180deg, transparent, rgba(0, 0, 0, .72));
  opacity: 0;
  transition: opacity .22s;
}
.wp-item:hover .wp-ov { opacity: 1; }
.wp-item .wp-ov button {
  padding: 4px 9px;
  border-radius: 6px;
  font-size: 11px;
  color: #fff;
  background: rgba(255, 255, 255, .18);
  border: 1px solid rgba(255, 255, 255, .25);
  backdrop-filter: blur(6px);
}
.wp-item .wp-ov button:hover { background: rgba(255, 255, 255, .34); }
.wp-empty {
  grid-column: 1 / -1;
  padding: 34px 18px;
  text-align: center;
  font-size: 13px;
  color: var(--text-faint);
  border: 1px dashed var(--border);
  border-radius: var(--radius, 16px);
  line-height: 1.9;
}
.wp-opacity { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-faint); }
.wp-opacity input[type=range] { width: 110px; accent-color: var(--c1); }

/* ---------- 7. 学习打卡热力图 ---------- */
.heat-wrap { overflow-x: auto; padding-bottom: 4px; }
.heat-grid {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(7, 11px);
  gap: 3px;
  min-width: max-content;
}
.heat-cell {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: var(--panel-2, rgba(128, 128, 128, .16));
  transition: transform .15s;
}
.heat-cell:hover { transform: scale(1.35); }
.heat-cell.l1 { background: color-mix(in srgb, var(--c1) 32%, transparent); }
.heat-cell.l2 { background: color-mix(in srgb, var(--c1) 55%, transparent); }
.heat-cell.l3 { background: color-mix(in srgb, var(--c1) 78%, transparent); }
.heat-cell.l4 { background: linear-gradient(135deg, var(--c1), var(--c2)); }
.heat-legend { display: flex; align-items: center; gap: 5px; font-size: 10.5px; color: var(--text-faint); margin-top: 8px; justify-content: flex-end; }

/* ---------- 8. 术语悬浮解释 ---------- */
.term {
  border-bottom: 1px dashed color-mix(in srgb, var(--c3, var(--c2)) 70%, transparent);
  cursor: help;
  transition: background .15s;
}
.term:hover { background: color-mix(in srgb, var(--c3, var(--c2)) 14%, transparent); border-radius: 3px; }
.term-tip {
  position: absolute;
  z-index: 80;
  max-width: 300px;
  padding: 10px 13px;
  border-radius: 11px;
  font-size: 12.5px;
  line-height: 1.7;
  font-family: var(--font-ui, sans-serif);
  color: var(--text);
  background: var(--panel-solid, var(--bg));
  border: 1px solid var(--border-str, var(--border));
  box-shadow: var(--shadow-2);
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .18s, transform .18s;
}
.term-tip.show { opacity: 1; transform: none; }
.term-tip b { color: var(--c1); }

/* ---------- 9. 骨架屏 ---------- */
.sk { border-radius: 14px; background: linear-gradient(100deg, var(--panel) 30%, var(--panel-2, rgba(255,255,255,.1)) 50%, var(--panel) 70%); background-size: 220% 100%; animation: skShimmer 1.4s linear infinite; }
@keyframes skShimmer { from { background-position: 120% 0; } to { background-position: -120% 0; } }

/* ---------- 10. 移动端 ---------- */
@media (max-width: 640px) {
  .chara-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .wp-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .wp-caption { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  body.has-wp.wp-blur .wp-layer { filter: none; }
}