/* ==========================================================================
   AI API 平台 · 设计系统
   --------------------------------------------------------------------------
   风格基线（需求第九十三条：现代 AI SaaS / 浅色 / 白卡片 / 圆角 /
   柔和阴影 / 蓝紫科技感点缀 / 数据卡片 / 响应式）
   设计 token 与现有 workflow-app/static/index.html 保持一致，
   保证两个产品在视觉上同属一个家族。
   ========================================================================== */

/* ==========================================================================
   ★ 必须放在最前面：让 `hidden` 属性真正生效
   --------------------------------------------------------------------------
   浏览器默认样式里确实有 `[hidden] { display: none }`，但它属于 **UA 样式**；
   而**作者样式永远压过 UA 样式**（与选择器权重无关）。

   所以只要我们自己给元素写过 display，`hidden` 就彻底失效：
     .modal-backdrop{display:flex} / .user-menu-list{display:flex}
     / .nav-group{display:flex} / .sidebar{...} 都会无视 hidden 属性。
   于是 JS 里 `el.hidden = true` 明明执行了，页面上却一点变化都没有。

   真实症状（用户报的 bug）：
     弹窗遮罩从**页面一打开**就盖在内容上，点「关闭」和按 ESC 都"没反应"
     —— 其实处理函数都跑了，只是 CSS 让它继续显示。
     同理：未登录也常驻侧边栏、用户菜单一直展开。

   用 !important 兜底：必须压过所有带 display 的类规则。
   ========================================================================== */
[hidden]{ display:none !important; }

:root{
  --bg:#f3f5f8;
  --bg-2:#fafbfc;
  --panel:#ffffff;
  --panel-soft:#f7f9fc;
  --border:#e3e8ef;
  --border-strong:#d2dae6;
  --text:#111827;
  --text-soft:#465469;
  --muted:#5f6f86;
  --faint:#8da0b5;
  --blue:#4d8cff;
  --blue-strong:#2d6df6;
  --cyan:#2cc4d9;
  --purple:#8b5cf6;
  --amber:#f59e0b;
  --green:#10b981;
  --red:#ef4444;
  --shadow:0 18px 32px rgba(15,23,42,.07),0 5px 15px rgba(59,130,246,.04),0 2px 8px rgba(15,23,42,.03);
  --shadow-sm:0 2px 8px rgba(15,23,42,.05),0 1px 3px rgba(15,23,42,.04);
  --radius:14px;
  --radius-sm:10px;
  --radius-lg:20px;
  --grad:linear-gradient(135deg,#4d8cff 0%,#8b5cf6 100%);
  --grad-soft:linear-gradient(135deg,rgba(77,140,255,.08),rgba(139,92,246,.08));
}

*,*::before,*::after{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  background:var(--bg); color:var(--text);
  -webkit-font-smoothing:antialiased;
  font-size:14px; line-height:1.6;
  display:flex; flex-direction:column; min-height:100vh;
}
a{ color:var(--blue-strong); text-decoration:none; }
a:hover{ text-decoration:underline; }
h1,h2,h3,h4{ margin:0; font-weight:650; letter-spacing:-.01em; line-height:1.3; }
p{ margin:0; }
button{ font:inherit; cursor:pointer; }
input,select,textarea{ font:inherit; }
code,kbd,pre{ font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace; }

/* ============================ 顶部导航 ============================ */
.topbar{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(148,163,184,.18);
  box-shadow:0 1px 0 rgba(255,255,255,.7) inset;
}
.topbar-inner{
  max-width:1400px; margin:0 auto; height:58px;
  display:flex; align-items:center; gap:18px; padding:0 20px;
}
.brand{ display:flex; align-items:center; gap:9px; font-weight:700; font-size:15.5px; color:var(--text); }
.brand:hover{ text-decoration:none; }
.brand-mark{
  width:30px; height:30px; border-radius:9px; background:var(--grad);
  color:#fff; display:grid; place-items:center; font-size:16px;
  box-shadow:0 4px 10px rgba(77,140,255,.35);
}
.topnav{ display:flex; gap:4px; margin-left:8px; }
.topnav a{ padding:6px 12px; border-radius:8px; color:var(--text-soft); font-weight:550; font-size:13.5px; }
.topnav a:hover{ background:var(--panel-soft); color:var(--text); text-decoration:none; }
.topbar-right{ margin-left:auto; display:flex; align-items:center; gap:10px; }
.nav-group{ display:flex; align-items:center; gap:10px; }

.balance-chip{
  display:flex; align-items:center; gap:7px;
  padding:5px 12px; border-radius:999px;
  background:var(--grad-soft); border:1px solid rgba(77,140,255,.18);
  color:var(--text); font-weight:600; font-size:13px;
}
.balance-chip:hover{ text-decoration:none; border-color:rgba(77,140,255,.4); }
.balance-chip-label{ color:var(--muted); font-weight:500; }
.balance-chip-value{ color:var(--blue-strong); font-variant-numeric:tabular-nums; }

.user-menu{ position:relative; }
.user-menu-btn{
  display:flex; align-items:center; gap:8px;
  padding:5px 10px 5px 5px; border-radius:999px;
  background:var(--panel); border:1px solid var(--border);
  color:var(--text); font-size:13px; font-weight:550;
}
.user-menu-btn:hover{ border-color:var(--border-strong); }
.avatar{
  width:26px; height:26px; border-radius:50%; background:var(--grad);
  color:#fff; display:grid; place-items:center; font-size:12px; font-weight:700;
}
.caret{ color:var(--faint); font-size:10px; }
.user-menu-list{
  position:absolute; right:0; top:calc(100% + 8px); min-width:190px;
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--radius-sm); box-shadow:var(--shadow); padding:6px;
  display:flex; flex-direction:column; gap:1px; z-index:60;
}
.user-menu-list a,.user-menu-list button{
  display:block; width:100%; text-align:left;
  padding:8px 11px; border-radius:7px; border:0; background:transparent;
  color:var(--text-soft); font-size:13.5px; font-weight:500;
}
.user-menu-list a:hover,.user-menu-list button:hover{
  background:var(--panel-soft); color:var(--text); text-decoration:none;
}
.user-menu-list .divider{ height:1px; background:var(--border); margin:4px 6px; }
#logoutBtn{ color:var(--red); }

/* ============================ 布局 ============================ */
.layout{ flex:1; display:flex; max-width:1400px; width:100%; margin:0 auto; }
.sidebar{
  width:210px; flex:none; padding:20px 12px 20px 20px;
  border-right:1px solid var(--border);
}
.sidenav{ display:flex; flex-direction:column; gap:2px; position:sticky; top:78px; }
.sidenav-group{
  font-size:11px; font-weight:700; letter-spacing:.08em; text-transform:uppercase;
  color:var(--faint); padding:14px 10px 6px;
}
.sidenav-group:first-child{ padding-top:0; }
.sidenav a{
  display:flex; align-items:center; gap:9px;
  padding:8px 11px; border-radius:9px;
  color:var(--text-soft); font-size:13.5px; font-weight:550;
}
.sidenav a i{ font-style:normal; width:16px; text-align:center; color:var(--faint); font-size:13px; }
.sidenav a:hover{ background:var(--panel); color:var(--text); text-decoration:none; }
.sidenav a.active{
  background:var(--panel); color:var(--blue-strong);
  box-shadow:var(--shadow-sm); border:1px solid rgba(77,140,255,.16);
}
.sidenav a.active i{ color:var(--blue-strong); }
.content{ flex:1; min-width:0; padding:26px 28px 48px; }
.page-loading{ padding:60px; text-align:center; color:var(--faint); }

/* ============================ 页头 ============================ */
.page-head{ margin-bottom:22px; display:flex; align-items:flex-end; gap:16px; flex-wrap:wrap; }
.page-head h1{ font-size:22px; }
.page-head p{ color:var(--muted); font-size:13.5px; margin-top:4px; }
.page-head .spacer{ flex:1; }

/* ============================ 卡片 ============================ */
.card{
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--radius); box-shadow:var(--shadow-sm); padding:20px;
}
.card + .card{ margin-top:16px; }
.card-head{ display:flex; align-items:center; gap:12px; margin-bottom:16px; flex-wrap:wrap; }
.card-head h2,.card-head h3{ font-size:15px; }
.card-head .spacer{ flex:1; }
.card-sub{ color:var(--muted); font-size:12.5px; font-weight:400; }

.grid{ display:grid; gap:16px; }
.grid-2{ grid-template-columns:repeat(2,minmax(0,1fr)); }
.grid-3{ grid-template-columns:repeat(3,minmax(0,1fr)); }
.grid-4{ grid-template-columns:repeat(4,minmax(0,1fr)); }
@media (max-width:1100px){ .grid-4{ grid-template-columns:repeat(2,minmax(0,1fr)); } }
@media (max-width:860px){ .grid-2,.grid-3{ grid-template-columns:1fr; } }

/* 统计卡片 */
.stat{
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--radius); box-shadow:var(--shadow-sm);
  padding:18px; position:relative; overflow:hidden;
}
.stat::after{
  content:""; position:absolute; top:0; left:0; height:3px; width:100%;
  background:var(--grad); opacity:.85;
}
.stat-label{ color:var(--muted); font-size:12.5px; font-weight:550; display:flex; align-items:center; gap:6px; }
.stat-value{
  font-size:25px; font-weight:700; margin-top:8px; letter-spacing:-.02em;
  font-variant-numeric:tabular-nums; word-break:break-all;
}
.stat-value.sm{ font-size:19px; }
.stat-hint{ color:var(--faint); font-size:12px; margin-top:5px; }
.stat.primary{ background:var(--grad); border-color:transparent; }
.stat.primary .stat-label,.stat.primary .stat-hint{ color:rgba(255,255,255,.86); }
.stat.primary .stat-value{ color:#fff; }
.stat.primary::after{ display:none; }
.stat-unit{ font-size:13px; font-weight:600; color:var(--muted); margin-left:3px; }
.stat.primary .stat-unit{ color:rgba(255,255,255,.82); }

/* ============================ 按钮 ============================ */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:6px;
  padding:8px 15px; border-radius:9px; border:1px solid transparent;
  font-size:13.5px; font-weight:600; line-height:1.2;
  transition:background .15s, border-color .15s, box-shadow .15s, transform .06s;
  white-space:nowrap;
}
.btn:hover{ text-decoration:none; }
.btn:active{ transform:translateY(1px); }
.btn:disabled,.btn[aria-disabled="true"]{ opacity:.55; cursor:not-allowed; }
.btn-primary{ background:var(--grad); color:#fff; box-shadow:0 4px 12px rgba(77,140,255,.3); }
.btn-primary:hover{ box-shadow:0 6px 18px rgba(77,140,255,.4); }
.btn-ghost{ background:var(--panel); border-color:var(--border); color:var(--text-soft); }
.btn-ghost:hover{ border-color:var(--border-strong); color:var(--text); background:var(--panel-soft); }
.btn-soft{ background:var(--grad-soft); color:var(--blue-strong); border-color:rgba(77,140,255,.18); }
.btn-soft:hover{ border-color:rgba(77,140,255,.4); }
.btn-danger{ background:#fff; border-color:#fecaca; color:var(--red); }
.btn-danger:hover{ background:#fef2f2; border-color:#fca5a5; }
.btn-sm{ padding:5px 10px; font-size:12.5px; border-radius:7px; }
.btn-block{ width:100%; }
.btn-icon{ padding:5px 7px; font-size:13px; }

/* ============================ 表单 ============================ */
.field{ margin-bottom:15px; }
.field label{ display:block; font-size:13px; font-weight:600; color:var(--text-soft); margin-bottom:6px; }
.field .hint{ font-size:12px; color:var(--faint); margin-top:5px; }
.input,select.input,textarea.input{
  width:100%; padding:10px 12px; border-radius:9px;
  border:1px solid var(--border); background:var(--panel);
  color:var(--text); font-size:13.5px; outline:none;
  transition:border-color .15s, box-shadow .15s;
}
.input:focus{ border-color:var(--blue); box-shadow:0 0 0 3px rgba(77,140,255,.13); }
.input::placeholder{ color:var(--faint); }
textarea.input{ resize:vertical; min-height:90px; }
select.input{ cursor:pointer; }
.input-group{ display:flex; gap:8px; }
.input-group .input{ flex:1; }

/* ============================ 表格 ============================ */
.table-wrap{ overflow-x:auto; border-radius:var(--radius-sm); }
table.tbl{ width:100%; border-collapse:collapse; font-size:13px; }
table.tbl th{
  text-align:left; font-weight:650; color:var(--muted); font-size:12px;
  padding:10px 12px; border-bottom:1px solid var(--border);
  white-space:nowrap; background:var(--panel-soft);
}
table.tbl td{ padding:11px 12px; border-bottom:1px solid var(--border); vertical-align:middle; }
table.tbl tbody tr:last-child td{ border-bottom:0; }
table.tbl tbody tr:hover{ background:var(--panel-soft); }
.num{ text-align:right; font-variant-numeric:tabular-nums; }
.mono{ font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:12.5px; }
.nowrap{ white-space:nowrap; }
.empty{ padding:44px 20px; text-align:center; color:var(--faint); }
.empty-icon{ font-size:30px; opacity:.5; margin-bottom:8px; }

/* ============================ 徽章 ============================ */
.badge{
  display:inline-flex; align-items:center; gap:5px;
  padding:3px 9px; border-radius:999px;
  font-size:11.5px; font-weight:650; white-space:nowrap;
}
.badge-ok{ background:rgba(16,185,129,.12); color:#047857; }
.badge-warn{ background:rgba(245,158,11,.14); color:#b45309; }
.badge-err{ background:rgba(239,68,68,.12); color:#b91c1c; }
.badge-mute{ background:rgba(148,163,184,.16); color:#475569; }
.badge-info{ background:rgba(77,140,255,.12); color:var(--blue-strong); }
.dot{ width:6px; height:6px; border-radius:50%; background:currentColor; }

/* ============================ 分页 ============================ */
.pager{ display:flex; align-items:center; gap:10px; margin-top:16px; flex-wrap:wrap; }
.pager .spacer{ flex:1; }
.pager-info{ color:var(--muted); font-size:12.5px; }

/* ============================ 提示条 ============================ */
.alert{
  display:flex; gap:10px; align-items:flex-start;
  padding:12px 14px; border-radius:var(--radius-sm);
  font-size:13px; border:1px solid transparent;
}
.alert-icon{ font-size:15px; line-height:1.4; }
.alert-info{ background:rgba(77,140,255,.07); border-color:rgba(77,140,255,.2); color:#1e40af; }
.alert-warn{ background:rgba(245,158,11,.08); border-color:rgba(245,158,11,.25); color:#92400e; }
.alert-err{ background:rgba(239,68,68,.07); border-color:rgba(239,68,68,.22); color:#991b1b; }
.alert-ok{ background:rgba(16,185,129,.08); border-color:rgba(16,185,129,.22); color:#065f46; }

/* ============================ Toast ============================ */
.toast-wrap{
  position:fixed; top:70px; right:20px; z-index:200;
  display:flex; flex-direction:column; gap:9px; pointer-events:none;
}
.toast{
  min-width:230px; max-width:380px;
  background:var(--panel); border:1px solid var(--border);
  border-left:3px solid var(--blue);
  border-radius:var(--radius-sm); box-shadow:var(--shadow);
  padding:12px 14px; font-size:13px;
  animation:toastIn .22s ease-out;
}
.toast.ok{ border-left-color:var(--green); }
.toast.err{ border-left-color:var(--red); }
.toast.warn{ border-left-color:var(--amber); }
@keyframes toastIn{ from{ opacity:0; transform:translateX(14px); } to{ opacity:1; transform:none; } }

/* ============================ Modal ============================ */
.modal-backdrop{
  position:fixed; inset:0; z-index:150;
  background:rgba(15,23,42,.42); backdrop-filter:blur(2px);
  display:flex; align-items:center; justify-content:center; padding:20px;
}
.modal{
  background:var(--panel); border-radius:var(--radius-lg);
  box-shadow:0 30px 60px rgba(15,23,42,.28);
  width:100%; max-width:520px; max-height:88vh; overflow:auto;
  animation:modalIn .18s ease-out;
}
@keyframes modalIn{ from{ opacity:0; transform:scale(.97) translateY(6px); } to{ opacity:1; transform:none; } }
.modal-head{ display:flex; align-items:center; gap:12px; padding:18px 20px 0; }
.modal-head h3{ font-size:16px; flex:1; }
.modal-close{
  border:0; background:transparent; color:var(--faint);
  font-size:22px; line-height:1; padding:0 4px; border-radius:6px;
}
.modal-close:hover{ color:var(--text); background:var(--panel-soft); }
.modal-body{ padding:16px 20px; }
.modal-foot{ padding:0 20px 20px; display:flex; gap:9px; justify-content:flex-end; }

/* ============================ 落地页 / Hero ============================ */
.hero{
  max-width:1080px; margin:0 auto; padding:56px 24px 30px; text-align:center;
}
.hero-badge{
  display:inline-flex; align-items:center; gap:7px;
  padding:5px 13px; border-radius:999px; font-size:12.5px; font-weight:600;
  background:var(--grad-soft); color:var(--blue-strong);
  border:1px solid rgba(77,140,255,.2); margin-bottom:20px;
}
.hero h1{
  font-size:40px; line-height:1.18; letter-spacing:-.03em; font-weight:750;
  max-width:760px; margin:0 auto;
}
.hero h1 .grad{
  background:var(--grad); -webkit-background-clip:text; background-clip:text;
  -webkit-text-fill-color:transparent;
}
.hero p.lead{
  color:var(--muted); font-size:15.5px; max-width:620px;
  margin:16px auto 0; line-height:1.7;
}
.hero-actions{ display:flex; gap:11px; justify-content:center; margin-top:28px; flex-wrap:wrap; }
.hero-actions .btn{ padding:11px 22px; font-size:14.5px; }

.section{ max-width:1080px; margin:0 auto; padding:38px 24px; }
.section-head{ text-align:center; margin-bottom:26px; }
.section-head h2{ font-size:25px; letter-spacing:-.02em; }
.section-head p{ color:var(--muted); margin-top:8px; font-size:14px; }

.feature{
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--radius); padding:20px; box-shadow:var(--shadow-sm);
}
.feature-icon{
  width:38px; height:38px; border-radius:11px; display:grid; place-items:center;
  background:var(--grad-soft); color:var(--blue-strong); font-size:18px; margin-bottom:12px;
}
.feature h3{ font-size:14.5px; margin-bottom:6px; }
.feature p{ color:var(--muted); font-size:13px; line-height:1.65; }

.steps{ counter-reset:step; display:grid; gap:14px; grid-template-columns:repeat(4,minmax(0,1fr)); }
@media (max-width:900px){ .steps{ grid-template-columns:1fr 1fr; } }
@media (max-width:600px){ .steps{ grid-template-columns:1fr; } }
.step{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  padding:18px; box-shadow:var(--shadow-sm); position:relative;
}
.step-num{
  width:26px; height:26px; border-radius:8px; background:var(--grad); color:#fff;
  display:grid; place-items:center; font-size:12.5px; font-weight:700; margin-bottom:10px;
}
.step h4{ font-size:13.5px; margin-bottom:5px; }
.step p{ color:var(--muted); font-size:12.5px; line-height:1.6; }

/* ============================ 代码块 ============================ */
.code-block{
  background:#0f172a; color:#e2e8f0;
  border-radius:var(--radius-sm); padding:14px 16px;
  font-size:12.5px; line-height:1.75; overflow-x:auto;
  position:relative; white-space:pre;
}
.code-block .cmt{ color:#64748b; }
.code-block .key{ color:#7dd3fc; }
.code-block .str{ color:#a5f3a5; }
.code-tabs{ display:flex; gap:4px; margin-bottom:10px; flex-wrap:wrap; }
.code-tab{
  padding:5px 12px; border-radius:8px; border:1px solid var(--border);
  background:var(--panel); color:var(--text-soft); font-size:12.5px; font-weight:600;
}
.code-tab.active{ background:var(--grad-soft); color:var(--blue-strong); border-color:rgba(77,140,255,.3); }
/* 未配置密钥的支付渠道：置灰不可点，但让管理员看得见（否则会误以为"功能没做"） */
.code-tab:disabled{ opacity:.5; cursor:not-allowed; }

/* 扫码支付二维码（服务端用 qrcode 渲染的 SVG，直接内联展示） */
.pay-qr{
  display:flex; flex-direction:column; align-items:center; gap:6px;
  margin-top:10px; padding:14px; border-radius:12px;
  background:#fff; border:1px solid var(--border);
}
.pay-qr svg{ width:220px; height:220px; display:block; }


/* ============================ 认证页 ============================ */
.auth-wrap{
  flex:1; display:flex; align-items:center; justify-content:center;
  padding:44px 20px;
}
.auth-card{
  width:100%; max-width:412px;
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--radius-lg); box-shadow:var(--shadow);
  padding:30px 28px;
}
.auth-card h1{ font-size:21px; text-align:center; }
.auth-card .sub{ text-align:center; color:var(--muted); font-size:13px; margin-top:6px; margin-bottom:22px; }
.auth-switch{ text-align:center; font-size:13px; color:var(--muted); margin-top:16px; }

/* ============================ 密钥展示 ============================ */
.key-reveal{
  background:#0f172a; border-radius:var(--radius-sm); padding:14px;
  display:flex; align-items:center; gap:10px;
}
.key-reveal code{
  flex:1; color:#a5f3a5; font-size:12.5px; word-break:break-all; line-height:1.6;
}
.key-reveal .btn{ background:rgba(255,255,255,.1); border-color:rgba(255,255,255,.2); color:#fff; }
.key-reveal .btn:hover{ background:rgba(255,255,255,.18); }

/* ============================ 其它 ============================ */
.divider-h{ height:1px; background:var(--border); margin:18px 0; }
.text-muted{ color:var(--muted); }
.text-faint{ color:var(--faint); }
.text-sm{ font-size:12.5px; }
.text-ok{ color:var(--green); }
.text-err{ color:var(--red); }
.text-warn{ color:var(--amber); }
.flex{ display:flex; align-items:center; gap:10px; }
.flex-wrap{ flex-wrap:wrap; }
.gap-sm{ gap:7px; }
.mt-0{ margin-top:0; }
.mt-1{ margin-top:10px; }
.mt-2{ margin-top:18px; }
.mb-1{ margin-bottom:10px; }
.tr{ text-align:right; }
.pill-price{ font-variant-numeric:tabular-nums; font-weight:650; }

/* ---------- 图片/视频分档价格（1K/2K/4K、480P/720P/1080P） ----------
 *
 * 每个档位一行，档位标签用等宽 + 固定宽度，这样 1K / 2K / 4K 三个价格
 * 能纵向对齐 —— 一眼就能比出「2K 是 1K 的两倍」。
 */
.tier-line{
  display:flex; align-items:baseline; gap:7px;
  padding:2px 0; white-space:nowrap;
}
.tier-line + .tier-line{ border-top:1px dashed var(--border); }
.tier-tag{
  display:inline-block; min-width:52px;
  font-family:var(--mono, ui-monospace, SFMono-Regular, Menlo, monospace);
  font-size:11.5px; font-weight:600; letter-spacing:.3px;
  color:var(--faint);
}

/* ---------- 在线试用：对话区 ---------- */
.pg-msgs{
  border:1px solid var(--border); border-radius:10px;
  background:var(--panel-2, var(--panel));
  min-height:220px; max-height:520px; overflow-y:auto;
  padding:14px; margin-bottom:14px;
  display:flex; flex-direction:column; gap:12px;
}
.msg{ display:flex; flex-direction:column; gap:4px; }
.msg-role{ font-size:11.5px; font-weight:700; letter-spacing:.4px; color:var(--faint); }
.msg-body{ font-size:13.5px; line-height:1.65; white-space:pre-wrap; word-break:break-word; }
/* 用户消息右对齐、加底色，一眼区分谁说的 */
.msg-user{ align-items:flex-end; text-align:right; }
.msg-user .msg-body{
  background:rgba(77,140,255,.11); border:1px solid rgba(77,140,255,.22);
  border-radius:10px; padding:8px 12px; max-width:88%; text-align:left;
}
.msg-assistant .msg-body{
  background:var(--panel); border:1px solid var(--border);
  border-radius:10px; padding:10px 12px; max-width:96%;
}
.msg-meta{ font-size:11.5px; color:var(--faint); margin-top:2px; }

/* ============================ Footer ============================ */
.footer{ border-top:1px solid var(--border); background:var(--panel); margin-top:auto; }
.footer-inner{
  max-width:1400px; margin:0 auto; padding:18px 24px;
  display:flex; align-items:center; gap:10px; justify-content:center;
  color:var(--faint); font-size:12.5px; flex-wrap:wrap;
}
.footer-sep{ opacity:.5; }

/* ============================ 响应式 ============================ */
@media (max-width:900px){
  .sidebar{ display:none; }
  .content{ padding:20px 16px 40px; }
  .topnav{ display:none; }
  .hero h1{ font-size:29px; }
  .hero{ padding:34px 18px 20px; }
  .brand-text{ display:none; }
}
@media (max-width:600px){
  .user-menu-btn #navEmail{ display:none; }
  .stat-value{ font-size:21px; }
}