:root {
  --bg: #0a0e14;
  --bg-elev: #11161e;
  --card: #151c26;
  --border: #22303f;
  --text: #e6f1f8;
  --text-dim: #8ba3b8;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --accent-soft: rgba(125, 211, 252, 0.12);
  --danger: #f87171;
  --success: #4ade80;
  --radius: 12px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.6 system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }
button { font: inherit; }
input, textarea, select { background: var(--bg-elev); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 0.55rem 0.7rem; font: inherit; outline: none; width: 100%; }
input:focus, textarea:focus, select:focus { border-color: var(--accent); }
textarea { min-height: 80px; resize: vertical; }
.app { max-width: 1080px; margin: 0 auto; padding: 1.5rem; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem; padding: 0.55rem 1rem; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); cursor: pointer; transition: all 0.15s; white-space: nowrap; }
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); color: #0a0e14; border-color: var(--accent); font-weight: 600; }
.btn-primary:hover { background: var(--accent-strong); }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: rgba(248, 113, 113, 0.1); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.85rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; }
.field { margin-bottom: 1rem; }
.field label { display: block; margin-bottom: 0.4rem; color: var(--text-dim); font-size: 0.85rem; }
.row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 160px; }
.toast-root { position: fixed; top: 1rem; right: 1rem; z-index: 1000; display: flex; flex-direction: column; gap: 0.5rem; }
.toast { background: var(--card); border: 1px solid var(--border); border-left: 3px solid var(--accent); padding: 0.7rem 1rem; border-radius: 8px; min-width: 200px; animation: slideIn 0.2s ease; }
.toast.error { border-left-color: var(--danger); }
.toast.success { border-left-color: var(--success); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: grid; place-items: center; z-index: 100; padding: 1rem; }
.modal { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; max-width: 480px; width: 100%; }
.modal h3 { margin: 0 0 1rem; }
.modal-actions { display: flex; gap: 0.5rem; justify-content: flex-end; margin-top: 1.25rem; }
.muted { color: var(--text-dim); font-size: 0.88rem; }
.error-text { color: var(--danger); }
.hidden { display: none !important; }