:root {
  --bg: #0f1115; --bg-soft: #13161f; --card: #161922; --card-hover: #1c2030;
  --text: #e5e7eb; --sub: #9ca3af; --accent: #7c5cff; --accent-soft: rgba(124,92,255,.15);
  --border: #232736; --danger: #ef4444; --ok: #22c55e;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg); color: var(--text);
  font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
.muted { color: var(--sub); font-size: 13px; }
.hidden { display: none !important; }

/* ===== 按钮 ===== */
.btn {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 9px 16px; border-radius: 9px; cursor: pointer; font-size: 14px;
  transition: .2s;
}
.btn:hover { background: var(--card-hover); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.1); }
.btn.danger { color: var(--danger); border-color: rgba(239,68,68,.4); }
.btn.danger:hover { background: rgba(239,68,68,.1); }
.btn.small { padding: 5px 11px; font-size: 13px; }
.icon-btn {
  background: none; border: none; color: var(--sub); font-size: 22px;
  cursor: pointer; line-height: 1;
}
.icon-btn:hover { color: var(--text); }

/* ===== 登录页 ===== */
.login-view {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.login-card {
  width: 100%; max-width: 380px; background: var(--card);
  border: 1px solid var(--border); border-radius: 16px; padding: 34px 28px;
}
.login-card h1 { font-size: 22px; }
.login-card .sub { color: var(--sub); font-size: 14px; margin: 6px 0 24px; }
.login-card label { display: block; margin-bottom: 16px; }
.login-card label span { display: block; font-size: 13px; color: var(--sub); margin-bottom: 6px; }
.login-card input {
  width: 100%; padding: 11px 13px; border-radius: 9px;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
  font-size: 14px;
}
.login-card input:focus { outline: none; border-color: var(--accent); }
.login-card .btn { width: 100%; padding: 11px; }
.login-card .back { display: block; text-align: center; margin-top: 18px; font-size: 13px; }

/* ===== 管理面板 ===== */
.admin-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px; flex-shrink: 0; background: var(--card);
  border-right: 1px solid var(--border); padding: 22px 16px;
  display: flex; flex-direction: column; gap: 18px;
  position: sticky; top: 0; height: 100vh;
}
.brand { display: flex; flex-direction: column; gap: 2px; }
.brand strong { font-size: 18px; }
.tabs { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.tab {
  text-align: left; background: none; border: none; color: var(--sub);
  padding: 10px 12px; border-radius: 9px; cursor: pointer; font-size: 14px;
}
.tab:hover { background: var(--bg-soft); color: var(--text); }
.tab.active { background: var(--accent-soft); color: var(--accent); }
.side-footer { display: flex; flex-direction: column; gap: 8px; }
.side-footer .btn { font-size: 13px; }

.panel { flex: 1; padding: 32px 40px; max-width: 900px; }
.panel h2 { font-size: 20px; margin-bottom: 20px; }

.pane-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.pane-head h2 { margin-bottom: 0; }

/* ===== 表单 ===== */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-grid .full { grid-column: 1 / -1; }
.form-grid label { display: block; }
.form-grid label span { display: block; font-size: 13px; color: var(--sub); margin-bottom: 6px; }
.form-grid input,
.form-grid textarea {
  width: 100%; padding: 10px 12px; border-radius: 9px;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
  font-size: 14px; font-family: inherit;
}
.form-grid textarea { resize: vertical; }
.form-grid input:focus, .form-grid textarea:focus { outline: none; border-color: var(--accent); }
.form-error { color: var(--danger); font-size: 13px; grid-column: 1/-1; min-height: 18px; }

/* ===== 列表 ===== */
.list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.list-item {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 18px; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.list-item .info { flex: 1; min-width: 0; }
.list-item .info h4 { font-size: 15px; margin-bottom: 4px; }
.list-item .info p { color: var(--sub); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.list-item .actions { display: flex; gap: 8px; flex-shrink: 0; }

/* ===== 弹窗 ===== */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,.6);
  display: flex; align-items: center; justify-content: center; z-index: 1000; padding: 20px;
}
.modal-box {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  width: 100%; max-width: 520px; max-height: 85vh; overflow-y: auto; padding: 24px;
}
.modal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.modal-head h3 { font-size: 18px; }
.modal .form-grid { margin-bottom: 20px; }

/* ===== 提示 ===== */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  padding: 10px 20px; border-radius: 10px; font-size: 14px; opacity: 0;
  transition: opacity .3s; pointer-events: none; z-index: 2000;
}
.toast.show { opacity: 1; }
.toast.error { border-color: var(--danger); }
.toast.ok { border-color: var(--ok); }

@media (max-width: 768px) {
  .admin-shell { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; flex-wrap: wrap; }
  .tabs { flex-direction: row; flex: 1 1 100%; }
  .panel { padding: 20px; }
  .form-grid { grid-template-columns: 1fr; }
}