:root{
  --bg:#0f1117; --card:#1a1d27; --text:#e6e8ef; --muted:#8b90a0;
  --accent:#7c5cff; --accent2:#4fd1c5; --border:#2a2e3a;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{color:inherit;text-decoration:none}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:16px 24px;
  border-bottom:1px solid var(--border);background:#15171f;position:sticky;top:0;z-index:10}
.brand{font-size:20px;font-weight:700;color:var(--accent)}
.topbar nav a{margin-left:18px;color:var(--muted);transition:color .2s}
.topbar nav a:hover{color:var(--text)}
main{max-width:1280px;margin:0 auto;padding:28px 24px 80px}
footer{text-align:center;color:var(--muted);padding:32px;border-top:1px solid var(--border);font-size:13px}
.page-title{font-size:28px;margin-bottom:24px;font-weight:700}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;
  transition:transform .25s,border-color .25s,box-shadow .25s}
.card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 12px 28px rgba(124,92,255,.18)}
.thumb{position:relative;width:100%;aspect-ratio:4/3;background:#000;overflow:hidden}
.thumb iframe{position:absolute;top:0;left:0;width:800px;height:600px;border:0;
  transform:scale(0.35);transform-origin:top left;pointer-events:none}
.card .meta{padding:14px 16px}
.card h3{font-size:16px;font-weight:600;margin-bottom:6px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.card .by{font-size:13px;color:var(--muted)}
.card .views{font-size:12px;color:var(--accent2);margin-top:4px}
.empty{text-align:center;padding:80px 20px;color:var(--muted)}
.empty .btn{margin-top:18px;display:inline-block}
.form-wrap{max-width:620px;margin:0 auto}
.form-wrap h1{font-size:24px;margin-bottom:24px}
.form{display:flex;flex-direction:column;gap:18px}
.form label{display:flex;flex-direction:column;gap:8px;font-size:14px;color:var(--muted)}
.form input,.form textarea{padding:12px 14px;background:var(--card);border:1px solid var(--border);
  border-radius:8px;color:var(--text);font:inherit;font-size:14px;transition:border-color .2s}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--accent)}
.form input[type=file]{padding:8px;cursor:pointer}
.btn{display:inline-block;padding:10px 20px;border-radius:8px;background:var(--card);
  border:1px solid var(--border);color:var(--text);cursor:pointer;font:inherit;
  transition:all .2s;text-align:center}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.btn.primary:hover{box-shadow:0 4px 14px rgba(124,92,255,.4)}
.detail{display:grid;grid-template-columns:1fr 360px;gap:24px;align-items:start}
.detail-main{background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;
  aspect-ratio:16/10}
.viewer{width:100%;height:100%;border:0;background:#fff}
.detail-side{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:22px;
  position:sticky;top:80px}
.detail-side h2{font-size:20px;margin-bottom:6px}
.detail-side .by{color:var(--accent2);font-size:14px;margin-bottom:4px}
.detail-side .muted{color:var(--muted);font-size:13px;margin-bottom:18px}
.detail-side h3{font-size:14px;color:var(--muted);margin:22px 0 10px;text-transform:uppercase;letter-spacing:1px}
.detail-side .actions{margin:14px 0}
.model-tag{display:inline-block;font-size:12px;color:var(--accent);background:rgba(124,92,255,.12);border:1px solid rgba(124,92,255,.3);padding:2px 9px;border-radius:6px;margin:4px 0;line-height:1.5}
.detail-side .model-tag{margin-bottom:10px}
.card .model-tag{margin-top:2px;margin-bottom:4px}
.prompt{background:#0c0e14;border-left:3px solid var(--accent);padding:14px;
  border-radius:6px;white-space:pre-wrap;word-break:break-word;font-family:ui-monospace,monospace;
  font-size:13px;max-height:400px;overflow:auto}
@media(max-width:900px){.detail{grid-template-columns:1fr}.detail-side{position:static}}

/* 顶栏：用户名 + 退出 */
.topbar nav .user{color:var(--accent2);margin-left:18px;font-weight:600;font-size:14px}
.topbar nav .btn-link{margin-left:10px;background:none;border:0;color:var(--muted);cursor:pointer;font:inherit;font-size:14px;padding:0}
.topbar nav .btn-link:hover{color:#ff6b6b}

/* 删除按钮 */
.btn.danger{border-color:rgba(255,107,107,.4);color:#ff8585}
.btn.danger:hover{border-color:#ff6b6b;background:rgba(255,107,107,.12);box-shadow:0 4px 14px rgba(255,107,107,.25)}

/* 注册/登录页 */
.auth-body{display:flex;align-items:center;justify-content:center;min-height:100vh;
  background:radial-gradient(circle at 30% 20%,rgba(124,92,255,.15),transparent 50%),
             radial-gradient(circle at 70% 80%,rgba(79,209,197,.12),transparent 50%),var(--bg)}
.auth-wrap{width:100%;max-width:400px;padding:32px 24px;text-align:center}
.auth-wrap .brand{display:inline-block;margin-bottom:28px}
.auth-title{font-size:24px;font-weight:700;margin-bottom:22px}
.auth-form{display:flex;flex-direction:column;gap:16px;text-align:left}
.auth-form label{display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--muted)}
.auth-form input{padding:12px 14px;background:var(--card);border:1px solid var(--border);
  border-radius:8px;color:var(--text);font:inherit;font-size:15px;transition:border-color .2s}
.auth-form input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(124,92,255,.15)}
.auth-form .btn{margin-top:8px;padding:12px;font-size:15px}
.auth-error{background:rgba(255,107,107,.1);border:1px solid rgba(255,107,107,.35);color:#ffb3b3;
  padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:16px}
.auth-switch{margin-top:20px;font-size:14px;color:var(--muted)}
.auth-switch a{color:var(--accent);margin-left:6px}
.auth-switch a:hover{text-decoration:underline}