/* ===== 土撕 教程站 样式 ===== */
:root{
  --bg:#0f1115;
  --panel:#171a21;
  --panel2:#1e222c;
  --border:#262c38;
  --text:#e8eaf0;
  --muted:#9aa3b2;
  --accent:#fb7299;      /* B站粉 */
  --accent2:#00aeec;     /* B站蓝 */
  --radius:12px;
  --shadow:0 6px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box;margin:0;padding:0}
html{color-scheme:dark}
body{
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.6;
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

/* ---- 顶栏 ---- */
.site-header{
  position:sticky;top:0;z-index:10;
  background:rgba(15,17,21,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.header-inner{
  max-width:1180px;margin:0 auto;padding:14px 20px;
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
}
.brand{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--text);text-decoration:none;font-weight:700;font-size:19px;
}
.brand-mark{
  width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:inline-flex;align-items:center;justify-content:center;
  color:#fff;font-size:13px;
}
.brand-sub{color:var(--muted);font-weight:400;font-size:14px}

.search-box{
  margin-left:auto;position:relative;flex:1;max-width:380px;min-width:200px;
}
.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted)}
#search-input{
  width:100%;padding:9px 14px 9px 36px;
  border-radius:999px;border:1px solid var(--border);
  background:var(--panel);color:var(--text);font-size:14px;outline:none;
  transition:border-color .15s, box-shadow .15s;
}
#search-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(251,114,153,.15)}
#search-input::placeholder{color:var(--muted)}
.back-link{color:var(--muted);text-decoration:none;font-size:14px}
.back-link:hover{color:var(--accent)}

/* ---- 主体 ---- */
.container{max-width:1180px;margin:0 auto;padding:24px 20px;width:100%;flex:1}
.toolbar{margin-bottom:16px}
.result-info{color:var(--muted);font-size:14px}

.video-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:20px;
}

/* ---- 视频卡片 ---- */
.card{
  display:block;text-decoration:none;color:inherit;
  background:var(--panel);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--accent2)}
.card-cover{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#1e2430,#2a3140);overflow:hidden}
.card-cover img{width:100%;height:100%;object-fit:cover;display:block}
.card-play{
  position:absolute;inset:0;margin:auto;
  width:52px;height:52px;border-radius:50%;
  background:rgba(0,0,0,.55);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;padding-left:4px;
  opacity:0;transition:opacity .18s;
  border:2px solid rgba(255,255,255,.65);
}
.card:hover .card-play{opacity:1}
.card-cover .cover-fallback{
  position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  padding:14px;text-align:center;
  color:#c7ccd8;font-size:14px;
  background:linear-gradient(135deg,#1e2430,#2a3140);
}
.card-body{padding:12px 14px 14px}
.card-body h3{font-size:15px;font-weight:600;line-height:1.45;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-cat{margin-top:8px;color:var(--muted);font-size:12.5px;
  display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.tag{
  display:inline-block;padding:2px 9px;border-radius:999px;
  background:rgba(0,174,236,.14);color:var(--accent2);
  font-size:12px;margin-right:8px;
}

/* ---- 空状态 ---- */
.empty{text-align:center;padding:60px 0;color:var(--muted)}
.empty-sub{font-size:14px;margin-top:6px}
.empty a{color:var(--accent)}

/* ---- 播放页 ---- */
.play-wrap{max-width:960px}
.player-frame{
  aspect-ratio:16/9;width:100%;
  background:#000;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);
}
.player-frame iframe{width:100%;height:100%;border:0;display:block}
.play-info{margin-top:22px}
.play-title{font-size:22px;font-weight:700;line-height:1.4}
.play-meta{margin-top:10px;display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.play-bvid{color:var(--muted);font-size:12.5px}
.play-desc{margin-top:12px;color:var(--muted);font-size:14.5px;white-space:pre-wrap}
.play-actions{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:9px 18px;border-radius:999px;border:1px solid var(--border);
  background:var(--panel2);color:var(--text);
  font-size:14px;cursor:pointer;text-decoration:none;
  transition:background .15s, border-color .15s;
}
.btn:hover{background:#272d3a;border-color:var(--accent2)}
.btn-primary{background:linear-gradient(135deg,var(--accent),#e2557f);border-color:transparent;color:#fff;font-weight:600}
.btn-primary:hover{filter:brightness(1.08);background:linear-gradient(135deg,var(--accent),#e2557f)}

/* ---- 底部 ---- */
.site-footer{
  border-top:1px solid var(--border);
  padding:18px 20px;text-align:center;color:var(--muted);font-size:13px;
}

/* ---- 公告弹窗 ---- */
.modal-overlay{
  position:fixed;inset:0;z-index:999;
  background:rgba(0,0,0,.6);
  display:flex;align-items:center;justify-content:center;
  padding:20px;
}
.modal-overlay[hidden]{display:none !important}
.modal-card{
  background:var(--panel2);border:1px solid var(--border);
  border-radius:16px;padding:28px 30px;max-width:420px;width:100%;
  box-shadow:var(--shadow);text-align:center;
  animation:modal-in .25s ease;
}
@keyframes modal-in{from{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}
.modal-title{margin-bottom:14px;font-size:20px}
.modal-body{color:var(--muted);font-size:15px;line-height:1.8;margin-bottom:22px}

/* ---- Toast ---- */
.toast{
  position:fixed;left:50%;bottom:36px;transform:translateX(-50%);
  background:#1f2733;color:#fff;padding:10px 22px;border-radius:999px;
  font-size:14px;box-shadow:var(--shadow);border:1px solid var(--border);
  z-index:99;
}

@media (max-width:560px){
  .header-inner{gap:10px}
  .search-box{max-width:none;order:3;flex-basis:100%}
  .play-title{font-size:18px}
}