/* =====================================================================
   四川高校 AI 大模型门户 — design-system.css
   设计系统落地版 v1.1 ｜ 风格: 明亮 · 干净 · 清爽舒爽
   参考: Apple(留白) · Stripe(清晰) · IBM Carbon(秩序) · Mintlify(清新)
   适用: HTML + CSS + jQuery + Layui ｜ 全部使用 CSS 变量, 禁止硬编码色值
   ===================================================================== */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* 主色 · 冷静蓝 */
  --color-primary: #2E6BE6;
  --color-primary-hover: #245BD0;
  --color-primary-active: #1E4FB5;
  --color-primary-subtle: #EAF1FE;
  --color-on-primary: #FFFFFF;

  /* 清新辅色 · 仅少量点缀 */
  --color-accent: #0FA39A;

  /* 中性 / 表面 (浅色) */
  --color-bg: #F4F7FB;
  --color-surface: #FFFFFF;
  --color-surface-2: #F1F5FA;
  --color-surface-3: #E9EEF5;
  --color-border: #E3E8F0;
  --color-border-strong: #CFD7E3;

  /* 文字灰阶 */
  --color-text: #1E2733;
  --color-text-secondary: #5A6675;
  --color-text-tertiary: #93A0B0;

  /* 语义色 · 统一降饱和 */
  --color-success: #15A05A;
  --color-warning: #C9871A;
  --color-danger: #D9534F;
  --color-info: #3B82C4;
  --color-success-subtle: rgba(21, 160, 90, 0.10);
  --color-warning-subtle: rgba(201, 135, 26, 0.10);
  --color-danger-subtle: rgba(217, 83, 79, 0.10);
  --color-info-subtle: rgba(59, 130, 196, 0.10);

  /* 四舱微色 · 仅作小面积点缀 */
  --studio-chat: #2E6BE6;
  --studio-image: #0FA39A;
  --studio-voice: #5B7FD6;
  --studio-video: #3E9BC4;

  /* 字体 */
  --font-sans: "Inter", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 字号阶梯 (400/600 字重) */
  --text-hero: 36px;
  --text-h1: 28px;
  --text-h2: 22px;
  --text-h3: 18px;
  --text-h4: 16px;
  --text-lg: 15px;
  --text-base: 14px;
  --text-sm: 13px;
  --text-caption: 12px;
  --text-mono: 13px;

  /* 间距 (4px 基准) */
  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 40px; --space-8: 48px;
  --space-9: 64px; --space-10: 96px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 999px;

  /* 阴影 (极淡, 仅轻微分离) */
  --shadow-xs: 0 1px 2px rgba(30, 39, 51, 0.04);
  --shadow-sm: 0 1px 3px rgba(30, 39, 51, 0.06);
  --shadow-md: 0 4px 12px rgba(30, 39, 51, 0.08);
  --shadow-lg: 0 8px 24px rgba(30, 39, 51, 0.10);

  /* 布局 */
  --container: 1200px;
  --container-admin: 1280px;
  --nav-height: 58px;
  --sidebar-width: 240px;

  /* 层级 */
  --z-nav: 100;
  --z-dropdown: 200;
  --z-modal: 1000;
  --z-toast: 1100;

  --transition: 150ms ease;
}

/* ---------- 2. Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 22px;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p { margin: 0; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }
img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }

/* 数字对齐 */
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ---------- 3. Icon ---------- */
.icon {
  width: 22px; height: 22px;
  display: inline-block;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: middle;
}
.icon-sm { width: 18px; height: 18px; }
.icon-lg { width: 28px; height: 28px; }
.icon-xl { width: 40px; height: 40px; }
.icon-spin { animation: icon-spin 1s linear infinite; }
@keyframes icon-spin { to { transform: rotate(360deg); } }

/* 四舱微色 */
.studio-chat  { color: var(--studio-chat); }
.studio-image { color: var(--studio-image); }
.studio-voice { color: var(--studio-voice); }
.studio-video { color: var(--studio-video); }
/* 语义色 */
.tone-success { color: var(--color-success); }
.tone-warning { color: var(--color-warning); }
.tone-danger  { color: var(--color-danger); }
.tone-info    { color: var(--color-info); }
.tone-accent  { color: var(--color-accent); }

/* ---------- 4. Layout ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--space-5); }
.container-admin { max-width: var(--container-admin); }
.section { padding: var(--space-9) 0; }
.section-sm { padding: var(--space-7) 0; }
.row { display: flex; flex-wrap: wrap; gap: var(--space-5); }
.col { flex: 1 1 0; min-width: 0; }
.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.stack > * + * { margin-top: var(--space-4); }
.mt-2 { margin-top: var(--space-2); } .mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); } .mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); } .mt-8 { margin-top: var(--space-8); }
.mb-3 { margin-bottom: var(--space-3); } .mb-4 { margin-bottom: var(--space-4); }
.center { text-align: center; }
.right { text-align: right; }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-sm { font-size: var(--text-sm); }
.text-caption { font-size: var(--text-caption); }
.divider { height: 1px; background: var(--color-border); border: 0; margin: var(--space-5) 0; }

/* ---------- 5. Typography helpers ---------- */
.h-hero { font-size: var(--text-hero); font-weight: 600; line-height: 46px; letter-spacing: -0.01em; }
.h1 { font-size: var(--text-h1); font-weight: 600; line-height: 38px; }
.h2 { font-size: var(--text-h2); font-weight: 600; line-height: 30px; }
.h3 { font-size: var(--text-h3); font-weight: 600; line-height: 26px; }
.h4 { font-size: var(--text-h4); font-weight: 600; line-height: 24px; }
.lead { font-size: var(--text-lg); color: var(--color-text-secondary); line-height: 26px; }

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-family: var(--font-sans); font-weight: 600; font-size: var(--text-base); line-height: 22px;
  border-radius: var(--radius-md); padding: 9px 20px; min-height: 40px;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.btn .icon { width: 18px; height: 18px; }
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn-primary:active { background: var(--color-primary-active); }
.btn-secondary { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border-strong); }
.btn-secondary:hover { background: var(--color-surface-2); border-color: var(--color-primary); color: var(--color-primary); }
.btn-ghost { background: transparent; color: var(--color-text-secondary); border-color: transparent; padding: 8px 14px; }
.btn-ghost:hover { background: var(--color-surface-2); color: var(--color-text); }
.btn-outline-primary { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline-primary:hover { background: var(--color-primary-subtle); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn.is-loading, .btn[aria-busy="true"] { opacity: 0.7; pointer-events: none; position: relative; }
.btn.is-loading::before {
  content: ""; width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent;
  animation: btn-spin 0.8s linear infinite; margin-right: 4px;
}
@keyframes btn-spin { to { transform: rotate(360deg); } }
.btn-danger:hover { filter: brightness(0.95); }
.btn-block { display: flex; width: 100%; }
.btn-sm { padding: 6px 14px; min-height: 34px; font-size: var(--text-sm); }
.btn-sm .icon { width: 15px; height: 15px; }
.btn:disabled, .btn[disabled] { opacity: 0.55; cursor: not-allowed; pointer-events: none; }
.btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* ---------- 7. Cards ---------- */
.card {
  display: block;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow-sm);
}
.card-hover { transition: border-color var(--transition), box-shadow var(--transition); }
.card-hover:hover { border-color: var(--color-border-strong); box-shadow: var(--shadow-md); }
.card-pad-lg { padding: 24px; }
.card-studio {
  display: flex; flex-direction: column;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-top: 3px solid var(--studio-color, var(--color-primary));
  border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow-sm);
}
.card-studio:hover { border-color: var(--color-border-strong); box-shadow: var(--shadow-md); transform: translateY(-2px); }
/* 卡片底部价格/状态行对齐到最下方，保证等高卡片视觉整齐 */
.card-studio > .row:last-child { margin-top: auto; }
.card-studio.is-chat  { --studio-color: var(--studio-chat); }
.card-studio.is-image { --studio-color: var(--studio-image); }
.card-studio.is-voice { --studio-color: var(--studio-voice); }
.card-studio.is-video { --studio-color: var(--studio-video); }
/* ---------- 模型头像 (大模型图片) ---------- */
.model-avatar { width: 44px; height: 44px; border-radius: 12px; flex: none; margin-bottom: 14px; display: block; }
.model-avatar-sm { width: 28px; height: 28px; border-radius: 8px; flex: none; display: inline-block; vertical-align: middle; }


/* ---------- 8. Inputs & Forms ---------- */
.field { display: block; }
.field > label { display: block; font-size: var(--text-sm); font-weight: 600; color: var(--color-text-secondary); margin-bottom: var(--space-2); }
/* 注册方式互斥面板：内部字段仍需保持与 stack 一致的垂直间距 */
.method-panel > .field + .field { margin-top: var(--space-4); }
.input, .select, .textarea {
  width: 100%; background: var(--color-surface); color: var(--color-text);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  padding: 9px 14px; font: 400 var(--text-base)/22px var(--font-sans);
  height: 40px; transition: border-color var(--transition), box-shadow var(--transition);
}
.textarea { height: auto; min-height: 96px; resize: vertical; line-height: 22px; }
.input::placeholder, .textarea::placeholder { color: var(--color-text-tertiary); }
.input:focus, .select:focus, .textarea:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}
.input-error, .input-error:focus { border-color: var(--color-danger); box-shadow: 0 0 0 3px var(--color-danger-subtle); }
.field-error { color: var(--color-danger); font-size: var(--text-sm); margin-top: var(--space-2); display: none; }
.field.has-error .field-error { display: block; }
.form-hint { color: var(--color-text-tertiary); font-size: var(--text-sm); margin-top: var(--space-2); }
.form-row { display: grid; gap: var(--space-4); }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }

/* ---------- 9. Badges & Status ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px;
  border-radius: var(--radius-pill); font: 500 var(--text-caption)/16px var(--font-sans);
  background: var(--color-surface-2); color: var(--color-text-secondary);
}
.badge-success { background: var(--color-success-subtle); color: var(--color-success); }
.badge-warning { background: var(--color-warning-subtle); color: var(--color-warning); }
.badge-danger  { background: var(--color-danger-subtle);  color: var(--color-danger); }
.badge-muted   { background: var(--color-bg-muted); color: var(--color-text-tertiary); border: 1px dashed var(--color-border); }
.badge-primary { background: var(--color-primary-subtle); color: var(--color-primary); }
.badge-info    { background: var(--color-primary-subtle);  color: var(--color-primary); }
.badge-accent  { background: rgba(15,163,154,0.10); color: var(--color-accent); }
.dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; flex: none; }
.dot-pending { background: var(--color-text-tertiary); }
.dot-running { background: var(--color-info); animation: dot-pulse 1.4s infinite; }
.dot-success { background: var(--color-success); }
.dot-failed  { background: var(--color-danger); }
@keyframes dot-pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------- 10. Navbar (Portal) ---------- */
.navbar {
  position: sticky; top: 0; height: var(--nav-height); z-index: var(--z-nav);
  background: var(--color-surface); border-bottom: 1px solid var(--color-border);
}
.navbar-inner { height: 100%; display: flex; align-items: center; gap: var(--space-5); }
.brand { display: flex; align-items: center; gap: var(--space-3); font-weight: 600; color: var(--color-text); font-size: var(--text-h4); }
.brand .brand-mark {
  width: 32px; height: 32px; border-radius: var(--radius-md); background: var(--color-primary-subtle);
  color: var(--color-primary); display: grid; place-items: center;
}
.brand .brand-mark .icon { width: 20px; height: 20px; }
.nav-links { display: flex; align-items: center; gap: var(--space-1); margin-left: var(--space-4); }
.nav-link {
  display: inline-flex; align-items: center; gap: 6px; color: var(--color-text-secondary);
  font: 500 var(--text-base)/22px var(--font-sans); padding: 8px 14px; border-radius: var(--radius-md);
}
.nav-link:hover, .nav-link.active { color: var(--color-primary); background: var(--color-surface-2); }
.nav-spacer { flex: 1; }
.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.menu-trigger { display: none; }
/* 下拉菜单 (AI 应用) */
.nav-item { position: relative; }
.caret { font-size: 10px; opacity: 0.7; margin-left: 2px; }
.nav-menu {
  position: absolute; top: 100%; left: 0; min-width: 210px;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-md); padding: var(--space-2);
  display: none; z-index: var(--z-dropdown);
}
/* 桥接触发区与菜单之间的空隙，避免鼠标下移时 hover 中断导致菜单瞬间消失 */
.nav-menu::before { content: ""; position: absolute; left: 0; right: 0; top: -10px; height: 10px; }
.nav-item:hover .nav-menu, .nav-item:focus-within .nav-menu { display: block; }
.nav-menu a { display: flex; align-items: center; gap: var(--space-3); padding: 9px 12px; border-radius: var(--radius-sm); color: var(--color-text-secondary); font-size: var(--text-sm); }
.nav-menu a:hover { background: var(--color-surface-2); color: var(--color-primary); }
.nav-menu a.active { color: var(--color-primary); background: var(--color-primary-subtle); }

/* 积分胶囊 */
.credit-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px;
  background: var(--color-surface-2); border-radius: var(--radius-pill);
  font: 600 var(--text-sm) var(--font-mono); color: var(--color-text);
}
.credit-chip .icon { width: 15px; height: 15px; color: var(--color-accent); }

/* 用户头像 */
.avatar {
  width: 34px; height: 34px; border-radius: 50%; background: var(--color-primary-subtle);
  color: var(--color-primary); display: grid; place-items: center; font-weight: 600; font-size: var(--text-sm);
  border: 1px solid var(--color-border); overflow: hidden;
}

/* ---------- 11. Sidebar (Admin) ---------- */
.admin-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-width); flex: none; background: var(--color-surface);
  border-right: 1px solid var(--color-border); position: sticky; top: 0; height: 100vh;
  display: flex; flex-direction: column; padding: var(--space-4) 0;
}
.sidebar .brand { padding: 0 var(--space-5) var(--space-4); }
.side-nav { display: flex; flex-direction: column; gap: 2px; padding: 0 var(--space-3); }
.side-link {
  display: flex; align-items: center; gap: var(--space-3); color: var(--color-text-secondary);
  font: 500 var(--text-base)/22px var(--font-sans); padding: 10px 14px; border-radius: var(--radius-md);
  border-left: 3px solid transparent; position: relative;
}
.side-link .icon { width: 19px; height: 19px; }
.side-link:hover { background: var(--color-surface-2); color: var(--color-text); }
.side-link.active { color: var(--color-primary); background: var(--color-primary-subtle); border-left-color: var(--color-primary); }
.sidebar-foot { margin-top: auto; padding: var(--space-4) var(--space-3) 0; border-top: 1px solid var(--color-border); margin-top: auto; }
.side-user { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3); border-radius: var(--radius-md); }
.side-user .meta { min-width: 0; }
.side-user .name { font-weight: 600; font-size: var(--text-sm); }
.side-user .role { font-size: var(--text-caption); color: var(--color-text-tertiary); }
.admin-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.admin-topbar {
  height: var(--nav-height); display: flex; align-items: center; gap: var(--space-4);
  padding: 0 var(--space-6); background: var(--color-surface); border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; z-index: var(--z-nav);
}
.admin-content { padding: var(--space-6); }
.breadcrumb { display: flex; align-items: center; gap: var(--space-2); color: var(--color-text-tertiary); font-size: var(--text-sm); }
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb .sep { opacity: 0.6; }

/* ---------- 12. Tables ---------- */
.table-wrap { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; }
.table { width: 100%; border-collapse: collapse; font-size: var(--text-base); }
.table th {
  text-align: left; font-weight: 600; font-size: var(--text-sm); color: var(--color-text-secondary);
  background: var(--color-surface-2); padding: 12px 16px; border-bottom: 1px solid var(--color-border); white-space: nowrap;
}
.table td { padding: 12px 16px; border-bottom: 1px solid var(--color-border); vertical-align: middle; }
.table tbody tr:last-child td { border-bottom: 0; }
.table tbody tr:hover { background: var(--color-surface-2); }
.table .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }
.cell-strong { font-weight: 600; }
.cell-muted { color: var(--color-text-secondary); }
.row-actions { display: flex; gap: var(--space-2); }

/* ---------- 13. Tabs ---------- */
.tabs { display: flex; gap: var(--space-1); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-5); }
.tab {
  padding: 10px 16px; font-weight: 500; font-size: var(--text-base); color: var(--color-text-secondary);
  border-bottom: 2px solid transparent; margin-bottom: -1px; cursor: pointer; background: none; border-top: 0; border-left: 0; border-right: 0;
}
.tab:hover { color: var(--color-text); }
.tab.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.tab-panel { display: none; }
.tab-panel.active { display: grid; }

/* ---------- 14. Modal ---------- */
.modal-mask { position: fixed; inset: 0; background: rgba(30, 39, 51, 0.40); z-index: var(--z-modal); display: none; align-items: center; justify-content: center; padding: var(--space-4); }
.modal-mask.open { display: flex; }
.modal { background: var(--color-surface); border: 1px solid var(--color-border-strong); border-radius: var(--radius-lg); padding: 24px; width: min(480px, 92vw); box-shadow: var(--shadow-lg); max-height: calc(100vh - 48px); overflow-y: auto; }
.modal-mask.modal-large .modal { width: min(920px, 95vw); }
.modal-head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-4); }
.modal-head .h3 { flex: 1; }
.modal-foot { display: flex; justify-content: flex-end; gap: var(--space-3); margin-top: var(--space-5); }
.code-block {
  background: #0f172a; color: #e2e8f0;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px; line-height: 1.55;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  white-space: pre;
  overflow-x: auto;
  border: 1px solid #1e293b;
  margin: 0;
}
.tabs-sm { gap: 4px; }
.tabs-sm .tab { padding: 4px 10px; font-size: 12px; border-radius: 8px; }
.input-sm { min-height: 28px; font-size: 12px; }
.table-sm td { padding: 6px 8px; vertical-align: middle; border-bottom: 1px dashed var(--color-border); }
.table-sm tr:last-child td { border-bottom: none; }

/* ---------- 15. AI 专属组件 ---------- */
/* 对话气泡 */
.chat { display: flex; flex-direction: column; gap: var(--space-4); }
.bubble { max-width: 78%; padding: 12px 16px; border-radius: var(--radius-lg); font-size: var(--text-base); line-height: 22px; }
.bubble-user { align-self: flex-end; background: var(--color-primary); color: #fff; border-radius: 12px 12px 4px 12px; }
.bubble-ai { align-self: flex-start; background: var(--color-surface-2); border: 1px solid var(--color-border); border-radius: 12px 12px 12px 4px; }
.bubble .meta { font-size: var(--text-caption); margin-top: 6px; opacity: 0.7; }

/* ============ Markdown 渲染（AI 回复语言适配） ============ */
.bubble .md-body { overflow-wrap: break-word; word-break: break-word; min-width: 0; }
.bubble-ai .md-body > *:first-child { margin-top: 0; }
.bubble-ai .md-body > *:last-child { margin-bottom: 0; }
.bubble .md-body h1, .bubble .md-body h2, .bubble .md-body h3,
.bubble .md-body h4, .bubble .md-body h5, .bubble .md-body h6 {
  margin: 14px 0 8px; font-weight: 600; line-height: 1.35;
}
.bubble .md-body h1 { font-size: 1.35em; }
.bubble .md-body h2 { font-size: 1.22em; }
.bubble .md-body h3 { font-size: 1.1em; }
.bubble .md-body p { margin: 8px 0; }
.bubble .md-body ul, .bubble .md-body ol { margin: 8px 0; padding-left: 22px; }
.bubble .md-body li { margin: 3px 0; }
.bubble .md-body a { color: var(--color-primary); text-decoration: underline; }
.bubble .md-body blockquote {
  margin: 8px 0; padding: 4px 12px; border-left: 3px solid var(--color-border-strong);
  color: var(--color-text-secondary);
}
.bubble .md-body code {
  font-family: var(--font-mono); font-size: 0.88em;
  background: var(--color-surface-3); padding: 2px 5px; border-radius: 4px;
}
.bubble .md-body pre {
  margin: 10px 0; padding: 12px 14px; border-radius: var(--radius-md);
  background: #F6F8FA; border: 1px solid var(--color-border);
  overflow-x: auto; line-height: 1.5;
}
.bubble .md-body pre code {
  background: transparent; padding: 0; font-size: 0.86em; display: block;
}
.bubble .md-body table { border-collapse: collapse; margin: 10px 0; width: 100%; }
.bubble .md-body th, .bubble .md-body td {
  border: 1px solid var(--color-border); padding: 6px 10px; text-align: left; font-size: 0.92em;
}
.bubble .md-body th { background: var(--color-surface-2); font-weight: 600; }
.bubble .md-body hr { border: 0; border-top: 1px solid var(--color-border); margin: 12px 0; }
.bubble .md-body img { max-width: 100%; border-radius: var(--radius-md); }

/* 打字机光标闪烁 */
.bubble .md-body.typing::after { content: '▌'; margin-left: 2px; animation: blink 1s steps(2) infinite; color: var(--color-primary); }
@keyframes blink { 50% { opacity: 0; } }

/* 任务进度条 */
.progress { height: 6px; background: var(--color-surface-2); border-radius: var(--radius-pill); overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--color-primary); border-radius: var(--radius-pill); transition: width var(--transition); }
.progress.is-image > span { background: var(--studio-image); }
.progress.is-voice > span { background: var(--studio-voice); }
.progress.is-video > span { background: var(--studio-video); }

/* Studio 双栏布局 */
.studio-layout { display: grid; grid-template-columns: 320px 1fr; gap: var(--space-5); align-items: start; }
/* 通用左栏：sticky 顶部对齐（图像/声音/视频工作室保持原生高度，内容多时滚动整页） */
.studio-panel { position: sticky; top: calc(var(--nav-height) + var(--space-5)); }
/* 对话工作室专用：整栏 + 主卡固定视口高度，左侧会话列表与右侧聊天内容独立滚动，防止页面被长对话拉高 */
.studio-panel.studio-panel-chat {
  display: flex;
  flex-direction: column;
  height: calc(100vh - var(--nav-height) - var(--header-h, 0px) - 80px);
  min-height: 560px;
  max-height: calc(100vh - var(--nav-height) - 80px);
  overflow: hidden;
}
.studio-panel.studio-panel-chat > .stack {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding-right: 4px;
  scrollbar-gutter: stable;
}
.studio-panel.studio-panel-chat > .stack::-webkit-scrollbar { width: 8px; }
.studio-panel.studio-panel-chat > .stack::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 6px; }
/* 工作室主卡：占满可视区减去顶部导航/页边距的高度，避免对话越长页面被拉长；
   对话内容在 .chat 内独立滚动，输入栏始终贴底可见。 */
.studio-chat-card {
  height: calc(100vh - var(--nav-height) - var(--header-h, 0px) - 80px);
  min-height: 560px;
  max-height: calc(100vh - var(--nav-height) - 80px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.studio-chat-card .chat {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding-right: 4px;
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
}
.studio-chat-card .chat::-webkit-scrollbar { width: 10px; }
.studio-chat-card .chat::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 8px; }
.studio-chat-card .chat::-webkit-scrollbar-thumb:hover { background: var(--color-border-strong); }
.param-block + .param-block { margin-top: var(--space-5); }
.param-block > .label { font-size: var(--text-sm); font-weight: 600; color: var(--color-text-secondary); margin-bottom: var(--space-2); display: block; }
.seg { display: flex; gap: var(--space-2); }
.seg button { flex: 1; padding: 8px; border: 1px solid var(--color-border); background: var(--color-surface); border-radius: var(--radius-md); font: 500 var(--text-sm) var(--font-sans); color: var(--color-text-secondary); cursor: pointer; }
.seg button.active { border-color: var(--color-primary); background: var(--color-primary-subtle); color: var(--color-primary); }

/* 统计卡 */
.stat-card .stat-label { font-size: var(--text-sm); color: var(--color-text-secondary); }
.stat-card .stat-value { font: 600 28px/36px var(--font-mono); font-variant-numeric: tabular-nums; margin-top: var(--space-2); }
.stat-card .stat-sub { font-size: var(--text-sm); color: var(--color-text-tertiary); margin-top: 4px; }

/* 空状态 */
.empty { text-align: center; padding: var(--space-9) var(--space-5); color: var(--color-text-tertiary); }
.empty .icon { width: 44px; height: 44px; color: var(--color-text-tertiary); margin: 0 auto var(--space-4); }
.empty .h4 { color: var(--color-text-secondary); }

/* 提示条 */
.alert { display: flex; gap: var(--space-3); align-items: flex-start; padding: 12px 16px; border-radius: var(--radius-md); font-size: var(--text-base); }
.alert .icon { width: 18px; height: 18px; flex: none; margin-top: 2px; }
.alert-info { background: var(--color-info-subtle); color: var(--color-info); }
.alert-success { background: var(--color-success-subtle); color: var(--color-success); }
.alert-warning { background: var(--color-warning-subtle); color: var(--color-warning); }
.alert-danger { background: var(--color-danger-subtle); color: var(--color-danger); }

/* 页脚 */
.footer { background: var(--color-surface); border-top: 1px solid var(--color-border); padding: var(--space-7) 0; margin-top: var(--space-9); }
.footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-6); }
.footer h4 { font-size: var(--text-sm); color: var(--color-text-secondary); margin-bottom: var(--space-3); }
.footer a { display: block; color: var(--color-text-secondary); font-size: var(--text-sm); padding: 4px 0; }
.footer a:hover { color: var(--color-primary); }
.footer-bottom { margin-top: var(--space-6); padding-top: var(--space-4); border-top: 1px solid var(--color-border); color: var(--color-text-tertiary); font-size: var(--text-sm); display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-3); }

/* 英雄区 */
.hero { background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.hero-inner { padding: var(--space-10) 0; text-align: center; }
.hero .badge { margin-bottom: var(--space-4); }
.hero .h-hero { max-width: 720px; margin: 0 auto; }
.hero .lead { max-width: 560px; margin: var(--space-4) auto var(--space-6); }
.hero-actions { display: flex; gap: var(--space-3); justify-content: center; flex-wrap: wrap; }
.hero-stats { display: flex; gap: var(--space-8); justify-content: center; margin-top: var(--space-8); flex-wrap: wrap; }
.hero-stats .item .n { font: 600 24px/32px var(--font-mono); }
.hero-stats .item .t { font-size: var(--text-sm); color: var(--color-text-secondary); }

/* 特性卡 */
.feature .icon-wrap { width: 44px; height: 44px; border-radius: var(--radius-md); background: var(--color-primary-subtle); color: var(--color-primary); display: grid; place-items: center; margin-bottom: var(--space-4); }

/* 登录/注册卡片 */
.auth-wrap { min-height: 100vh; display: grid; grid-template-columns: 1fr 1fr; }
.auth-aside { background: var(--color-primary-subtle); display: flex; flex-direction: column; justify-content: center; padding: var(--space-9); }
.auth-aside .h1 { color: var(--color-primary); max-width: 420px; }
.auth-aside .lead { color: var(--color-text-secondary); max-width: 420px; margin-top: var(--space-4); }
.auth-aside .points { margin-top: var(--space-6); display: grid; gap: var(--space-3); }
.auth-aside .points li { display: flex; gap: var(--space-3); align-items: center; color: var(--color-text-secondary); }
.auth-aside .points .icon { color: var(--color-success); }
.auth-main { display: flex; align-items: center; justify-content: center; padding: var(--space-6); }
.auth-card { width: min(400px, 100%); }
.auth-card .brand { justify-content: center; margin-bottom: var(--space-5); }
/* 表单置于页面左侧（如管理端登录：左表单 + 右介绍，与门户端左右对称） */
.auth-wrap.auth-left { grid-template-columns: 1fr 1fr; }
.auth-wrap.auth-left .auth-main { justify-content: center; }
@media (max-width: 768px) {
  .auth-wrap.auth-left .auth-main { justify-content: center; }
}

/* 步骤指示 */
.steps { display: flex; gap: var(--space-2); margin-bottom: var(--space-5); }
.step { flex: 1; display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-sm); color: var(--color-text-tertiary); }
.step .num { width: 24px; height: 24px; border-radius: 50%; background: var(--color-surface-2); display: grid; place-items: center; font-weight: 600; flex: none; }
.step.active { color: var(--color-primary); }
.step.active .num { background: var(--color-primary); color: #fff; }
.step.done .num { background: var(--color-success); color: #fff; }

/* ---------- 16. Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .studio-layout { grid-template-columns: 1fr; }
  .studio-panel { position: static; }
}
@media (max-width: 768px) {
  :root { --text-hero: 26px; --text-h1: 22px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .menu-trigger { display: inline-flex; }
  .navbar.open .nav-links { display: flex; position: absolute; top: var(--nav-height); left: 0; right: 0; flex-direction: column; background: var(--color-surface); border-bottom: 1px solid var(--color-border); padding: var(--space-3); }
  .footer .cols { grid-template-columns: 1fr 1fr; }
  .auth-wrap { grid-template-columns: 1fr; }
  .auth-aside { display: none; }
  /* Admin 移动端: Sidebar 转底部 Tab */
  .admin-shell { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--color-border); padding: var(--space-2); }
  .sidebar .brand, .sidebar-foot { display: none; }
  .side-nav { flex-direction: row; padding: 0; }
  .side-link { border-left: 0; border-bottom: 3px solid transparent; white-space: nowrap; padding: 10px 12px; }
  .side-link.active { border-left: 0; border-bottom-color: var(--color-primary); }
  .admin-content { padding: var(--space-4); }
  .table-wrap { overflow-x: auto; }
}
@media (max-width: 480px) {
  .grid-4 { grid-template-columns: 1fr; }
  .footer .cols { grid-template-columns: 1fr; }
  .hero-stats { gap: var(--space-5); }
  .credit-chip span.hide-sm { display: none; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ============== 页面转场（导航切换 + 登录页） ============== */
/* 通用站内导航切换：用 View Transitions API 做根级平滑过渡，消除“一闪一闪”。
   新老页面轻微位移 + 适度淡入淡出，视觉连贯、不白屏。
   注意：新页面（vf-page-in）只做轻微上移、不透明度保持在 0.6→1，
   避免“从全透明淡入”造成的空白闪动；数据骨架屏会同步兜底。
   登录页（aside/card 带 view-transition-name）在此基础上叠加专属交叉动画。 */
::view-transition-old(root) {
  animation: vf-page-out .18s ease-out both;
  mix-blend-mode: normal;
}
::view-transition-new(root) {
  animation: vf-page-in .2s ease-out both;
  mix-blend-mode: normal;
}
@keyframes vf-page-out {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: .6; transform: translateY(-8px); }
}
@keyframes vf-page-in {
  from { opacity: .6; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 介绍区：原地交叉切换，旧内容左移淡出、新内容右移淡入（同一方向布局） */
::view-transition-group(aside) {
  animation-duration: .5s;
  animation-timing-function: cubic-bezier(.22,.61,.36,1);
}
::view-transition-old(aside) {
  animation: vf-out-left .5s cubic-bezier(.22,.61,.36,1) both;
}
::view-transition-new(aside) {
  animation: vf-in-right .5s cubic-bezier(.22,.61,.36,1) both;
}

/* 表单卡片：同步平滑交叉 */
::view-transition-group(card) {
  animation-duration: .5s;
  animation-timing-function: cubic-bezier(.22,.61,.36,1);
}
::view-transition-old(card) {
  animation: vf-out-left .5s cubic-bezier(.22,.61,.36,1) both;
}
::view-transition-new(card) {
  animation: vf-in-right .5s cubic-bezier(.22,.61,.36,1) both;
}

@keyframes vf-out-left {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(-24px); }
}
@keyframes vf-in-right {
  from { opacity: 0; transform: translateX(24px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* 兜底：不支持 View Transitions 时用旧的全屏滑动 */
.page-transition-mask {
  position: fixed; inset: 0; z-index: 9998;
  background: var(--color-bg);
  pointer-events: none;
  opacity: 0;
  transition: opacity .18s ease;
}
body.page-leaving .page-transition-mask { opacity: 1; pointer-events: auto; }
body.page-leaving { overflow: hidden; }
body.page-leaving > *:not(.page-transition-mask) {
  transform: translateX(100%);
  transition: transform .42s cubic-bezier(.22,.61,.36,1);
}
/* 新页入场：从左侧滑入 */
body.page-entering .page-enter-anim {
  animation: page-slide-in .48s cubic-bezier(.22,.61,.36,1) both;
}
@keyframes page-slide-in {
  from { opacity: 0; transform: translateX(-40px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ============== Toast 提示（API 错误/成功反馈） ============== */
/* 顶部居中，从屏幕上缘滑入；带语义图标 + 左侧色条 + 淡色背景 */
.toast-root {
  position: fixed; top: 24px; left: 50%; transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  width: max-content; max-width: min(440px, calc(100vw - 32px));
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  position: relative;
  display: flex; align-items: flex-start; gap: 10px;
  background: var(--color-surface); color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 12px 18px 12px 14px; font-size: var(--text-sm);
  box-shadow: var(--shadow-lg);
  opacity: 0; transform: translateY(-16px) scale(.98);
  transition: opacity .28s cubic-bezier(.22,.61,.36,1), transform .28s cubic-bezier(.22,.61,.36,1);
  line-height: 1.5;
}
/* 左侧语义色条 */
.toast::before {
  content: ''; position: absolute; left: 0; top: 10px; bottom: 10px; width: 3px;
  border-radius: 0 3px 3px 0; background: var(--toast-accent, var(--color-info));
}
/* 语义图标（用 ::after 绘制，通过不同 class 上色） */
.toast-icon {
  flex: none; width: 20px; height: 20px; margin-top: 1px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: var(--toast-subtle, var(--color-info-subtle));
  color: var(--toast-accent, var(--color-info));
  font-weight: 700; font-size: 12px; line-height: 1; user-select: none;
}
.toast-msg { flex: 1; word-break: break-word; }
.toast.show { opacity: 1; transform: translateY(0) scale(1); }

/* 四种语义态：色条 + 图标 + 淡背景 */
.toast-success { --toast-accent: var(--color-success); --toast-subtle: var(--color-success-subtle); }
.toast-error   { --toast-accent: var(--color-danger);  --toast-subtle: var(--color-danger-subtle); }
.toast-warning { --toast-accent: var(--color-warning); --toast-subtle: var(--color-warning-subtle); }
.toast-info    { --toast-accent: var(--color-info);    --toast-subtle: var(--color-info-subtle); }

/* ============== 数据加载骨架屏（消除“空→填充”突变闪动） ============== */
/* 页面初始容器先渲染骨架占位，数据返回后替换为真实内容并轻微淡入，
   避免转场进入时看到空白区域、随后内容突然“闪”出。 */
.skeleton {
  position: relative; overflow: hidden;
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  pointer-events: none;
}
.skeleton::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg,
    transparent 0%, rgba(255,255,255,.55) 50%, transparent 100%);
  transform: translateX(-100%);
  animation: skeleton-shimmer 1.3s ease-in-out infinite;
}
@keyframes skeleton-shimmer {
  100% { transform: translateX(100%); }
}
/* 模型卡片骨架（网格内占位卡片） */
.skeleton-card {
  height: 148px; border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 18px;
  display: flex; flex-direction: column; gap: 12px;
}
.skeleton-card .sk-avatar { width: 34px; height: 34px; border-radius: var(--radius-md); }
.skeleton-card .sk-title { width: 60%; height: 16px; border-radius: 4px; }
.skeleton-card .sk-line  { width: 100%; height: 12px; border-radius: 4px; }
.skeleton-card .sk-line.short { width: 70%; }
.skeleton-card .sk-badge { width: 52px; height: 22px; border-radius: 999px; }
/* 表格行骨架 */
.skeleton-row { height: 42px; margin-bottom: 8px; }
.skeleton-num { width: 56px; height: 26px; border-radius: 6px; }
/* 导航栏登录态骨架占位：先盖住登录/注册区域，JS 根据登录状态再填真实按钮，
   避免已登录用户看到“登录/注册”按钮一闪而过 */
.nav-skeleton { display: flex; align-items: center; gap: var(--space-3); }
.nav-skeleton .skeleton { width: 64px; height: 32px; border-radius: 999px; }

/* 数据就绪后的柔和淡入（js 注入 data-ready 触发） */
.js-fade-in {
  opacity: 0;
  animation: js-fade-in .28s ease-out forwards;
}
@keyframes js-fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============== 数据就绪门（pageGate）：数据拉完才显示页面 ============== */
/* 数据页（<body data-gate="1">）进入时先盖一层不透明蒙层 + 加载指示，
   等页面数据请求全部就绪后再淡出蒙层露出完整内容，杜绝“半成品页面一闪而过”。 */
.page-gate-mask {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--color-bg);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 16px;
  transition: opacity .28s ease, visibility .28s ease;
}
.page-gate-mask.is-done {
  opacity: 0; visibility: hidden; pointer-events: none;
}
.page-gate-spinner {
  width: 42px; height: 42px; border-radius: 50%;
  border: 3px solid var(--color-surface-3);
  border-top-color: var(--color-primary);
  animation: page-gate-spin .8s linear infinite;
}
@keyframes page-gate-spin {
  to { transform: rotate(360deg); }
}
/* 结果卡加载转圈（生成中） */
.result-spinner {
  width: 36px; height: 36px; border-radius: 50%;
  border: 3px solid var(--color-surface-3);
  border-top-color: var(--color-primary);
  animation: page-gate-spin .8s linear infinite;
  margin-bottom: 10px;
}
.page-gate-text {
  font-size: var(--text-sm); color: var(--color-text-tertiary);
  letter-spacing: .5px;
}
/* 平滑隐藏时禁止误触底下按钮 */
.page-gate-mask.is-done * { pointer-events: none; }