* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-dark: #0a0f1a;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --bg-input: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.08);
  --border-focus: #64ffda;
  --text: #ccd6f6;
  --text-dim: #8892b0;
  --text-muted: #5a6580;
  --accent: #64ffda;
  --accent-hover: #48c9b0;
  --danger: #ff5252;
  --warning: #ffb74d;
  --success: #64ffda;
  --info: #64b5f6;
  --sidebar-w: 240px;
  --topbar-h: 56px;
  --radius: 10px;
  --radius-sm: 6px;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

.hidden { display: none !important; }
.page { display: none; }
.page:not(.hidden) { display: block; }
#appPage:not(.hidden) { display: flex; }

/* ===== 登录页 ===== */
.container { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.login-card { background: var(--bg-card); backdrop-filter: blur(20px); border: 1px solid var(--border); border-radius: 16px; padding: 40px; width: 100%; max-width: 420px; box-shadow: 0 8px 32px rgba(0,0,0,0.3); }
.logo { text-align: center; margin-bottom: 32px; }
.logo h1 { font-size: 28px; font-weight: 700; color: #fff; letter-spacing: 2px; }
.logo .subtitle { font-size: 12px; color: var(--text-muted); margin-top: 4px; letter-spacing: 1px; text-transform: uppercase; }
.auth-form { display: none; }
.auth-form.active { display: block; }
.auth-form h2 { font-size: 20px; font-weight: 500; color: var(--text); margin-bottom: 24px; text-align: center; }
.footer { margin-top: 32px; text-align: center; font-size: 12px; color: var(--text-muted); }

/* ===== 表单元素 ===== */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 10px 14px; background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: 14px; color: var(--text); outline: none;
  font-family: inherit; transition: border-color .2s, box-shadow .2s;
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--text-muted); }
.form-input:focus, .form-select:focus, .form-textarea:focus { border-color: var(--border-focus); box-shadow: 0 0 0 3px rgba(100,255,218,0.08); }
.form-textarea { resize: vertical; min-height: 60px; line-height: 1.6; }
.form-select { cursor: pointer; appearance: auto; }
.form-select-sm { padding: 6px 10px; font-size: 13px; }

/* ===== Alert ===== */
.alert { padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13px; margin-bottom: 12px; line-height: 1.5; }
.alert.error { background: rgba(255,82,82,0.12); border: 1px solid rgba(255,82,82,0.25); color: var(--danger); }
.alert.success { background: rgba(100,255,218,0.08); border: 1px solid rgba(100,255,218,0.2); color: var(--success); }
.alert.warning { background: rgba(255,183,77,0.12); border: 1px solid rgba(255,183,77,0.25); color: var(--warning); }
.alert.info { background: rgba(100,181,246,0.1); border: 1px solid rgba(100,181,246,0.2); color: var(--info); }
.lockout { display: flex; align-items: center; gap: 10px; padding: 14px; background: rgba(255,82,82,0.08); border: 1px solid rgba(255,82,82,0.2); border-radius: var(--radius-sm); margin-bottom: 12px; font-size: 14px; color: #ff8a80; }
.lock-icon { font-size: 20px; }
#countdown { font-weight: 700; color: var(--danger); font-variant-numeric: tabular-nums; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; border: none; border-radius: var(--radius-sm); font-size: 14px; font-weight: 500; cursor: pointer; transition: all .2s; font-family: inherit; white-space: nowrap; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: #0a192f; }
.btn-primary:hover:not(:disabled) { box-shadow: 0 4px 16px rgba(100,255,218,0.25); transform: translateY(-1px); }
.btn-accent { background: var(--accent); color: #0a192f; }
.btn-accent:hover:not(:disabled) { background: var(--accent-hover); }
.btn-warning { background: var(--warning); color: #1a1a2e; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid transparent; }
.btn-ghost:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-dim); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-block { width: 100%; justify-content: center; }
.btn-row { display: flex; gap: 8px; }
.switch-text { text-align: center; margin-top: 20px; font-size: 14px; color: var(--text-dim); }
.switch-text a { color: var(--accent); text-decoration: none; font-weight: 500; }
.switch-text a:hover { text-decoration: underline; }

/* ===== 布局: 侧边栏 + 主区 ===== */
#appPage { display: flex; min-height: 100vh; }
#appPage.hidden { display: none; }
.sidebar {
  width: var(--sidebar-w); background: rgba(10,15,30,0.95); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
  transition: transform .3s;
}
.sidebar-header { padding: 20px 16px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.sidebar-header h2 { font-size: 16px; font-weight: 600; color: #fff; display: flex; align-items: center; gap: 8px; }
.sidebar-header h2 i { color: var(--accent); }
.sidebar-toggle { display: none; background: none; border: none; color: var(--text-dim); font-size: 20px; cursor: pointer; }
.nav-menu { list-style: none; padding: 12px 8px; flex: 1; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: var(--radius-sm); cursor: pointer; color: var(--text-dim); font-size: 14px; transition: all .15s; margin-bottom: 2px; }
.nav-item:hover { background: rgba(255,255,255,0.05); color: var(--text); }
.nav-item.active { background: rgba(100,255,218,0.08); color: var(--accent); }
.nav-item i { font-size: 18px; width: 22px; text-align: center; }
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border); }
.user-info { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text); margin-bottom: 8px; }
.user-info i { font-size: 20px; color: var(--accent); }
.credits-badge { font-size: 12px; color: var(--warning); margin-bottom: 12px; display: flex; align-items: center; gap: 4px; }

/* ===== Main Area ===== */
.main-area { margin-left: var(--sidebar-w); flex: 1; min-height: 100vh; display: flex; flex-direction: column; }
.topbar { height: var(--topbar-h); padding: 0 24px; display: flex; align-items: center; justify-content: space-between; background: rgba(10,15,30,0.8); border-bottom: 1px solid var(--border); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 50; }
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text); font-size: 22px; cursor: pointer; }
.project-selector { display: flex; align-items: center; gap: 8px; }
.project-selector .form-select { min-width: 200px; }
.model-selector { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-dim); }

/* ===== Content Pages ===== */
.content-page { display: none; padding: 24px; flex: 1; }
.content-page.active { display: block; }
.page-header { margin-bottom: 24px; }
.page-header h2 { font-size: 22px; font-weight: 600; color: #fff; display: flex; align-items: center; gap: 10px; }
.page-header h2 i { color: var(--accent); }
.page-desc { font-size: 13px; color: var(--text-muted); margin-top: 6px; }

/* ===== Step Cards ===== */
.step-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 20px; overflow: hidden; }
.step-card.step-optional { border-style: dashed; }
.step-header { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.step-badge { background: var(--accent); color: #0a192f; font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 20px; }
.step-badge.badge-warning { background: var(--warning); }
.step-header h3 { font-size: 15px; font-weight: 500; flex: 1; }
.step-actions { display: flex; gap: 6px; }
.step-body { padding: 20px; }
.step-hint { font-size: 13px; color: var(--text-dim); margin-bottom: 16px; display: flex; align-items: center; gap: 6px; }
.step-hint i { color: var(--info); }
.textarea-group { margin-bottom: 16px; }
.textarea-group label { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.prompt-textarea { background: rgba(100,255,218,0.03); border-color: rgba(100,255,218,0.15); }
.step-footer { display: flex; align-items: center; justify-content: space-between; }
.step-status { font-size: 12px; color: var(--text-muted); }
.step-btns { display: flex; gap: 8px; }
.step-output { padding: 20px; border-top: 1px solid var(--border); background: rgba(100,255,218,0.02); }
.step-output > label { display: block; font-size: 13px; color: var(--accent); margin-bottom: 10px; font-weight: 500; }
.output-content { background: rgba(0,0,0,0.3); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; font-size: 14px; line-height: 1.8; white-space: pre-wrap; word-break: break-word; max-height: 500px; overflow-y: auto; color: var(--text); }
.output-oneline { white-space: normal; }
.output-meta { font-size: 11px; color: var(--text-muted); margin-top: 8px; }
.copy-all-btn { margin-top: 10px; }

/* ===== Badge ===== */
.badge { font-size: 10px; padding: 2px 8px; border-radius: 10px; font-weight: 500; }
.badge-info { background: rgba(100,181,246,0.15); color: var(--info); }
.badge-success { background: rgba(100,255,218,0.1); color: var(--success); }
.badge-warning { background: rgba(255,183,77,0.15); color: var(--warning); }

/* ===== Preset Manager ===== */
.preset-tabs { display: flex; gap: 4px; margin-bottom: 20px; }
.preset-tab { padding: 8px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: transparent; color: var(--text-dim); cursor: pointer; font-size: 13px; font-family: inherit; transition: all .2s; }
.preset-tab.active { background: rgba(100,255,218,0.1); border-color: rgba(100,255,218,0.3); color: var(--accent); }
.preset-list { display: grid; gap: 12px; }
.preset-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; display: flex; align-items: flex-start; gap: 16px; }
.preset-item-info { flex: 1; }
.preset-item-name { font-size: 15px; font-weight: 500; color: var(--text); margin-bottom: 4px; }
.preset-item-meta { font-size: 12px; color: var(--text-muted); }
.preset-item-preview { font-size: 13px; color: var(--text-dim); margin-top: 8px; max-height: 60px; overflow: hidden; line-height: 1.5; }
.preset-item-actions { display: flex; gap: 4px; }

/* ===== Settings ===== */
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.settings-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.settings-card.full-width { grid-column: 1 / -1; }
.settings-card h3 { font-size: 15px; font-weight: 500; padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 8px; color: var(--text); }
.settings-card h3 i { color: var(--accent); }
.settings-body { padding: 20px; }
.info-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.03); }
.info-label { font-size: 13px; color: var(--text-dim); }
.info-value { font-size: 13px; color: var(--text); font-weight: 500; }
.setting-hint { font-size: 12px; color: var(--text-muted); margin-bottom: 16px; line-height: 1.5; }
.credit-log-list { max-height: 300px; overflow-y: auto; }
.credit-log-item { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,0.03); font-size: 13px; }
.credit-log-desc { color: var(--text-dim); }
.credit-log-amount { font-weight: 600; }
.credit-log-amount.negative { color: var(--danger); }
.credit-log-amount.positive { color: var(--success); }
.empty-text { text-align: center; color: var(--text-muted); font-size: 13px; padding: 20px; }

/* ===== Model Tags ===== */
.model-list { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 0; }
.model-tag { display: inline-block; padding: 4px 10px; background: rgba(100,255,218,0.08); border: 1px solid rgba(100,255,218,0.2); border-radius: 20px; font-size: 12px; color: var(--accent); }

/* ===== Admin ===== */
.admin-tabs { display: flex; gap: 4px; margin-bottom: 20px; flex-wrap: wrap; }
.admin-tab { padding: 8px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: transparent; color: var(--text-dim); cursor: pointer; font-size: 13px; font-family: inherit; transition: all .2s; display: flex; align-items: center; gap: 6px; }
.admin-tab.active { background: rgba(100,255,218,0.1); border-color: rgba(100,255,218,0.3); color: var(--accent); }
.admin-panel { display: none; }
.admin-panel.active { display: block; }
.admin-toolbar { display: flex; gap: 8px; margin-bottom: 16px; align-items: center; }
.admin-toolbar .form-input { max-width: 300px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; text-align: center; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th { padding: 10px 14px; text-align: left; color: var(--text-muted); font-weight: 500; border-bottom: 1px solid var(--border); background: rgba(0,0,0,0.2); white-space: nowrap; }
.data-table td { padding: 10px 14px; border-bottom: 1px solid rgba(255,255,255,0.03); color: var(--text-dim); }
.data-table tr:hover td { background: rgba(255,255,255,0.02); }
.table-wrap { overflow-x: auto; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); }
.status-active { color: var(--success); }
.status-banned { color: var(--danger); }
.pagination { display: flex; gap: 4px; margin-top: 12px; justify-content: center; }
.page-btn { padding: 6px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: transparent; color: var(--text-dim); cursor: pointer; font-size: 12px; }
.page-btn.active { background: rgba(100,255,218,0.1); border-color: var(--accent); color: var(--accent); }
.checkbox-group { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.checkbox-group label { display: flex; align-items: center; gap: 4px; font-size: 12px; color: var(--text-dim); cursor: pointer; padding: 4px 8px; border: 1px solid var(--border); border-radius: var(--radius-sm); }
.checkbox-group input:checked + span { color: var(--accent); }

/* ===== Modal ===== */
.modal { position: fixed; inset: 0; z-index: 1000; display: flex; align-items: center; justify-content: center; }
.modal-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.modal-content { position: relative; background: #141825; border: 1px solid var(--border); border-radius: var(--radius); width: 90%; max-width: 560px; max-height: 85vh; overflow-y: auto; }
.modal-sm { max-width: 400px; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.modal-header h3 { font-size: 16px; font-weight: 500; }
.modal-close { background: none; border: none; color: var(--text-dim); font-size: 18px; cursor: pointer; padding: 4px; }
.modal-close:hover { color: var(--text); }
.modal-body { padding: 20px; }
.modal-section { margin-bottom: 16px; }
.modal-section label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 8px; padding: 16px 20px; border-top: 1px solid var(--border); }
.preset-modal-list { display: flex; flex-direction: column; gap: 6px; max-height: 200px; overflow-y: auto; }
.preset-modal-item { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; transition: all .15s; font-size: 13px; }
.preset-modal-item:hover { background: rgba(255,255,255,0.05); border-color: var(--accent); }
.preset-modal-item.selected { background: rgba(100,255,218,0.08); border-color: var(--accent); }

/* ===== Toast ===== */
.toast-container { position: fixed; top: 20px; right: 20px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast { padding: 12px 20px; border-radius: var(--radius-sm); font-size: 13px; color: #fff; animation: toastIn .3s ease; min-width: 200px; max-width: 360px; box-shadow: 0 4px 20px rgba(0,0,0,0.4); }
.toast.success { background: #1a6b50; border: 1px solid rgba(100,255,218,0.3); }
.toast.error { background: #6b1a1a; border: 1px solid rgba(255,82,82,0.3); }
.toast.info { background: #1a3a6b; border: 1px solid rgba(100,181,246,0.3); }
@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }

/* ===== Loading Spinner ===== */
.generating::after { content: ''; display: inline-block; width: 14px; height: 14px; border: 2px solid var(--text-muted); border-top-color: var(--accent); border-radius: 50%; animation: spin .6s linear infinite; margin-left: 8px; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle { display: block; }
  .mobile-menu-btn { display: block; }
  .main-area { margin-left: 0; }
  .settings-grid { grid-template-columns: 1fr; }
  .project-selector .form-select { min-width: 140px; }
  .topbar { padding: 0 12px; }
  .content-page { padding: 16px; }
  .step-header { flex-wrap: wrap; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .login-card { padding: 28px 20px; }
  .logo h1 { font-size: 22px; }
  .stats-grid { grid-template-columns: 1fr; }
}