/* ============================================
   AI 大模型平台 — 全局设计系统 v2
   侧边栏深色 · 主区明亮 · 渐变点缀
   ============================================ */

/* --- 1. Design Tokens --- */
:root {
    --navy-900: #0f172a;
    --navy-800: #1e293b;
    --navy-700: #334155;
    --navy-600: #475569;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --ink-900: #0f172a;
    --ink-800: #1e293b;
    --ink-600: #475569;
    --ink-500: #64748b;
    --ink-400: #94a3b8;
    --ink-300: #cbd5e1;
    --brand-500: #7c3aed;
    --brand-400: #8b5cf6;
    --brand-300: #a78bfa;
    --brand-50: #f5f3ff;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    --surface: #ffffff;
    --surface-hover: #f8fafc;
    --surface-sunken: #f1f5f9;
    --shadow-xs: 0 1px 2px rgba(15,23,42,.06);
    --shadow-sm: 0 1px 3px rgba(15,23,42,.08), 0 1px 2px rgba(15,23,42,.04);
    --shadow-md: 0 4px 12px rgba(15,23,42,.06), 0 2px 4px rgba(15,23,42,.04);
    --shadow-lg: 0 10px 30px rgba(15,23,42,.08), 0 4px 8px rgba(15,23,42,.04);
    --shadow-brand: 0 8px 24px rgba(124,58,237,.25);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
}

/* --- 2. Reset & Base --- */
* { box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
    background: #f6f8fb;
    color: var(--ink-800);
    margin: 0; padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "ss01", "cv11";
}

/* --- 3. Layout Wrapper --- */
.app-main-layout { position: relative; min-height: 100vh; }

/* --- 4. Sidebar (Dark Nav) --- */
.app-sidebar {
    width: 240px;
    background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 100%);
    position: fixed; top: 0; left: 0; bottom: 0;
    z-index: 100;
    display: flex; flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    border-right: 1px solid rgba(255,255,255,.04);
}
.app-sidebar::-webkit-scrollbar { width: 6px; }
.app-sidebar::-webkit-scrollbar-track { background: transparent; }
.app-sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 3px; }

.sidebar-brand {
    padding: 22px 20px 18px;
    display: flex; align-items: center; gap: 12px;
    border-bottom: 1px solid rgba(255,255,255,.06);
}
.sidebar-brand-logo {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--brand-500) 0%, var(--accent-blue) 100%);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-brand);
    flex-shrink: 0;
}
.sidebar-brand-logo i { font-size: 20px; color: #fff; }
.sidebar-brand-text { color: #fff; font-weight: 700; font-size: 16px; letter-spacing: -.01em; }
.sidebar-brand-sub { color: rgba(255,255,255,.35); font-size: 11px; font-weight: 400; letter-spacing: .06em; text-transform: uppercase; margin-top: 2px; }

.sidebar-section-label { color: rgba(255,255,255,.3); font-size: 11px; font-weight: 600; letter-spacing: .08em; padding: 18px 20px 8px; text-transform: uppercase; }
.sidebar-nav { padding: 4px 10px; flex: 1; }
.sidebar-nav a {
    display: flex; align-items: center; gap: 12px;
    padding: 11px 14px; margin-bottom: 2px;
    color: rgba(255,255,255,.55);
    text-decoration: none; font-size: 14px; font-weight: 500;
    border-radius: 8px;
    transition: all .18s ease-out;
    position: relative;
}
.sidebar-nav a:hover {
    color: rgba(255,255,255,.9);
    background: rgba(255,255,255,.06);
}
.sidebar-nav a i { font-size: 18px; width: 20px; text-align: center; opacity: .8; transition: opacity .18s; }
.sidebar-nav a:hover i { opacity: 1; }
.sidebar-nav a.active {
    color: #fff;
    background: linear-gradient(135deg, rgba(124,58,237,.25) 0%, rgba(59,130,246,.15) 100%);
    box-shadow: inset 0 0 0 1px rgba(124,58,237,.35);
}
.sidebar-nav a.active::before {
    content: ''; position: absolute; left: -10px; top: 50%;
    transform: translateY(-50%);
    width: 3px; height: 22px; border-radius: 0 3px 3px 0;
    background: linear-gradient(180deg, var(--brand-400), var(--accent-blue));
}
.sidebar-nav a.active i { opacity: 1; color: var(--brand-300); }

.sidebar-footer { padding: 14px; border-top: 1px solid rgba(255,255,255,.06); }
.sidebar-logout-btn {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px; border-radius: 8px;
    color: rgba(255,255,255,.5); text-decoration: none; font-size: 13px;
    transition: all .18s;
}
.sidebar-logout-btn:hover { color: var(--accent-rose); background: rgba(244,63,94,.08); }

/* --- 4. Main Area --- */
.app-main {
    margin-left: 240px;
    min-height: 100vh;
    display: flex; flex-direction: column;
}

/* --- 5. Top Bar --- */
.app-topbar {
    background: rgba(255,255,255,.75);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--slate-200);
    padding: 0 28px; height: 60px;
    display: flex; align-items: center; justify-content: space-between;
    position: sticky; top: 0; z-index: 90;
}
.topbar-crumbs { color: var(--ink-500); font-size: 13px; font-weight: 500; display: flex; align-items: center; gap: 6px; }
.topbar-crumbs .sep { color: var(--ink-300); }
.topbar-user { display: flex; align-items: center; gap: 14px; }
.topbar-user-name { color: var(--ink-600); font-size: 13px; font-weight: 500; }
.topbar-avatar {
    width: 38px; height: 38px; border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-500), var(--accent-blue));
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 700; font-size: 14px;
    box-shadow: 0 0 0 2px #fff, 0 0 0 4px rgba(124,58,237,.15);
}

/* --- 6. Content --- */
.app-content { padding: 28px; flex: 1; max-width: 1480px; width: 100%; }
.content-header { margin-bottom: 24px; }
.content-title { font-size: 22px; font-weight: 700; color: var(--ink-900); margin: 0 0 4px 0; letter-spacing: -.02em; }
.content-subtitle { font-size: 14px; color: var(--ink-500); margin: 0; }

/* --- 7. Stat Cards --- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--slate-200);
    display: flex; align-items: center; gap: 16px;
    position: relative; overflow: hidden;
    transition: all .25s ease;
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); border-color: var(--slate-300); }
.stat-card::before {
    content: ''; position: absolute; right: -20px; top: -20px;
    width: 100px; height: 100px; border-radius: 50%;
    opacity: .08;
}
.stat-card.accent-purple::before { background: var(--brand-500); }
.stat-card.accent-green::before { background: var(--accent-green); }
.stat-card.accent-amber::before { background: var(--accent-amber); }
.stat-card.accent-blue::before { background: var(--accent-blue); }

.stat-icon {
    width: 50px; height: 50px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; color: #fff; flex-shrink: 0;
}
.stat-icon.purple { background: linear-gradient(135deg, #7c3aed, #a78bfa); }
.stat-icon.green  { background: linear-gradient(135deg, #059669, #34d399); }
.stat-icon.amber  { background: linear-gradient(135deg, #d97706, #fbbf24); }
.stat-icon.blue   { background: linear-gradient(135deg, #2563eb, #60a5fa); }

.stat-body { flex: 1; min-width: 0; }
.stat-number { font-size: 30px; font-weight: 700; color: var(--ink-900); line-height: 1.1; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.stat-label { font-size: 13px; color: var(--ink-500); margin-top: 4px; font-weight: 500; }

/* --- 8. Box / Panel --- */
.box {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--slate-200);
    overflow: hidden;
    margin-bottom: 20px;
}
.box-header {
    padding: 16px 22px;
    border-bottom: 1px solid var(--slate-200);
    display: flex; align-items: center; justify-content: space-between;
    background: #fafbfe;
}
.box-header-title {
    font-weight: 600; font-size: 15px; color: var(--ink-800);
    display: flex; align-items: center; gap: 10px; letter-spacing: -.01em;
}
.box-header-title i { color: var(--brand-400); font-size: 17px; }
.box-body { padding: 22px; }

/* --- 9. Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 9px 18px; border-radius: 8px; border: none;
    font-size: 13.5px; font-weight: 600; cursor: pointer; text-decoration: none;
    transition: all .18s ease;
    line-height: 1.4; white-space: nowrap;
}
.btn-primary { background: linear-gradient(135deg, var(--brand-500), #6d28d9); color: #fff; box-shadow: 0 1px 2px rgba(124,58,237,.3); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-brand); }
.btn-blue { background: linear-gradient(135deg, var(--accent-blue), #1d4ed8); color: #fff; }
.btn-blue:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(59,130,246,.35); }
.btn-green { background: linear-gradient(135deg, var(--accent-green), #047857); color: #fff; }
.btn-green:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(16,185,129,.35); }
.btn-rose { background: linear-gradient(135deg, var(--accent-rose), #be123c); color: #fff; }
.btn-rose:hover { transform: translateY(-1px); }
.btn-amber { background: linear-gradient(135deg, var(--accent-amber), #b45309); color: #fff; }
.btn-amber:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(245,158,11,.35); }
.btn-outline {
    background: #fff; color: var(--ink-600); border: 1px solid var(--slate-300);
}
.btn-outline:hover { background: var(--slate-100); color: var(--ink-800); border-color: var(--ink-300); }
.btn-ghost { background: transparent; color: var(--ink-500); padding: 6px 12px; }
.btn-ghost:hover { background: var(--slate-100); color: var(--ink-800); }

/* --- 10. Tables --- */
.data-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13.5px; }
.data-table thead th {
    background: #f8fafc;
    padding: 12px 18px; text-align: center;
    font-weight: 600; color: var(--ink-500); font-size: 12px;
    text-transform: uppercase; letter-spacing: .05em;
    border-bottom: 1px solid var(--slate-200);
}
.data-table tbody td {
    padding: 14px 18px; text-align: center;
    border-bottom: 1px solid var(--slate-200);
    color: var(--ink-700);
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: #f8fafc; }

/* --- 11. Badges --- */
.badge {
    display: inline-flex; align-items: center;
    padding: 3px 10px; border-radius: 999px;
    font-size: 11.5px; font-weight: 600; letter-spacing: .01em;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-danger  { background: #fee2e2; color: #991b1b; }
.badge-info    { background: #dbeafe; color: #1e40af; }
.badge-amber   { background: #fef3c7; color: #92400e; }
.badge-purple  { background: #ede9fe; color: #5b21b6; }
.badge-slate   { background: #f1f5f9; color: #475569; }

/* --- 12. Forms --- */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-700); margin-bottom: 7px; }
.form-input {
    width: 100%; padding: 10px 14px;
    border: 1px solid var(--slate-300);
    border-radius: 8px;
    font-size: 14px; color: var(--ink-800);
    background: #fff;
    transition: all .18s ease;
    font-family: inherit;
}
.form-input:focus {
    outline: none;
    border-color: var(--brand-400);
    box-shadow: 0 0 0 3px rgba(124,58,237,.12);
}
.form-input::placeholder { color: var(--ink-400); }
.form-check { display: flex; align-items: center; gap: 10px; }
.form-check-input {
    width: 18px; height: 18px; cursor: pointer; accent-color: var(--brand-500);
}

/* --- 13. Model Cards --- */
.model-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 16px; }
.model-card {
    background: #fff; border-radius: var(--radius-lg);
    padding: 18px 20px;
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-xs);
    transition: all .25s ease;
    position: relative; overflow: hidden;
}
.model-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(124,58,237,.25);
}
.model-card-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.model-card-ico {
    width: 36px; height: 36px; border-radius: 9px;
    background: linear-gradient(135deg, rgba(124,58,237,.12), rgba(59,130,246,.1));
    color: var(--brand-500); display: flex; align-items: center; justify-content: center;
    font-size: 16px; flex-shrink: 0;
}
.model-name { font-weight: 700; font-size: 14.5px; color: var(--ink-900); letter-spacing: -.01em; }
.model-channel { font-size: 12px; color: var(--ink-500); margin-top: 2px; display: flex; align-items: center; gap: 4px; }
.model-channel i { font-size: 12px; }
.model-tags { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }
.model-tag {
    font-size: 11px; font-weight: 600; color: var(--ink-500);
    background: var(--slate-100); padding: 2px 9px; border-radius: 999px;
}
.model-tag.group { background: var(--brand-50); color: var(--brand-500); }
.model-group-label {
    grid-column: 1 / -1;
    font-size: 13px; font-weight: 700; color: var(--ink-800);
    padding: 12px 4px 4px;
    display: flex; align-items: center; gap: 8px;
}
.model-group-label::after { content: ''; flex: 1; height: 1px; background: var(--slate-200); }

/* --- 14. Toast / Flash --- */
.msg-flash { position: fixed; top: 80px; right: 28px; z-index: 9999; display: flex; flex-direction: column; gap: 10px; }
.toast {
    padding: 14px 22px; border-radius: 10px;
    font-size: 13.5px; font-weight: 500;
    box-shadow: var(--shadow-lg);
    animation: toastIn .35s cubic-bezier(.21,1.02,.73,1) backwards;
    display: flex; align-items: center; gap: 10px;
}
.toast.success { background: #fff; color: #065f46; border-left: 4px solid var(--accent-green); }
.toast.error   { background: #fff; color: #991b1b; border-left: 4px solid var(--accent-rose); }
.toast.success i { color: var(--accent-green); font-size: 18px; }
.toast.error   i { color: var(--accent-rose); font-size: 18px; }
@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }

/* --- 15. Token display --- */
.token-key-wrap {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--slate-100); padding: 4px 12px; border-radius: 6px;
    font-family: "SF Mono", Consolas, monospace; font-size: 12.5px; color: var(--ink-600);
    border: 1px solid var(--slate-200);
}
.token-key-wrap .copy-btn { cursor: pointer; color: var(--brand-500); font-size: 14px; background: none; border: none; }

/* --- 16. Empty state --- */
.empty-state { text-align: center; padding: 50px 20px; color: var(--ink-500); }
.empty-state i { font-size: 48px; color: var(--ink-300); margin-bottom: 14px; }
.empty-state p { margin: 4px 0; font-size: 14px; }

/* --- 17. Chat UI --- */
.chat-wrap {
    display: grid; grid-template-columns: 300px 1fr; gap: 20px;
    height: calc(100vh - 120px); min-height: 560px;
}
.chat-sidebar {
    background: #fff; border-radius: var(--radius-lg); border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm); padding: 18px; display: flex; flex-direction: column; gap: 16px;
    overflow-y: auto;
}
.chat-sidebar h4 { font-size: 13px; font-weight: 700; color: var(--ink-800); margin: 0 0 10px; letter-spacing: .02em; }
.chat-group-label { font-size: 11px; font-weight: 600; color: var(--ink-400); text-transform: uppercase; letter-spacing: .08em; padding: 14px 4px 6px; }
.chat-model-item {
    padding: 10px 12px; border-radius: 8px; cursor: pointer;
    border: 1px solid transparent; transition: all .18s;
    font-size: 13px; color: var(--ink-700);
}
.chat-model-item:hover { background: var(--brand-50); color: var(--brand-500); }
.chat-model-item.selected { background: var(--brand-50); border-color: rgba(124,58,237,.25); color: var(--brand-500); font-weight: 600; box-shadow: inset 0 0 0 1px rgba(124,58,237,.2); }
.chat-model-item .model-sub { font-size: 11px; color: var(--ink-400); font-weight: 400; margin-top: 2px; }
.chat-select { width: 100%; padding: 9px 12px; border: 1px solid var(--slate-300); border-radius: 8px; font-size: 13px; background: #fff; }
.chat-select:focus { outline: none; border-color: var(--brand-400); box-shadow: 0 0 0 3px rgba(124,58,237,.12); }

.chat-main {
    background: #fff; border-radius: var(--radius-lg); border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm); display: flex; flex-direction: column; overflow: hidden;
}
.chat-header {
    padding: 14px 22px; border-bottom: 1px solid var(--slate-200);
    display: flex; align-items: center; justify-content: space-between;
    background: linear-gradient(180deg, #fafbfe 0%, #fff 100%);
}
.chat-header-title { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--ink-800); }
.chat-header-title i { color: var(--brand-400); font-size: 18px; }
.chat-header-meta { font-size: 12px; color: var(--ink-500); }
.chat-status { font-size: 11px; padding: 2px 8px; border-radius: 999px; font-weight: 600; }
.chat-status.idle { background: #d1fae5; color: #065f46; }
.chat-status.idle i { color: #16a34a; }
.chat-status.loading { background: #fef3c7; color: #92400e; }
.chat-status.loading i { color: #d97706; }
.chat-status.ok { background: #d1fae5; color: #065f46; }
.chat-status.ok i { color: #16a34a; }
.chat-status.err { background: #fee2e2; color: #991b1b; }
.chat-status.err i { color: #dc2626; }

.chat-messages {
    flex: 1; overflow-y: auto; padding: 22px;
    background: #fafbfe;
}
.chat-msg { margin-bottom: 18px; display: flex; gap: 12px; max-width: 92%; }
.chat-msg.user { margin-left: auto; flex-direction: row-reverse; }
.chat-avatar {
    width: 36px; height: 36px; border-radius: 10px; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; color: #fff;
}
.chat-msg.bot .chat-avatar { background: linear-gradient(135deg, var(--brand-500), var(--accent-blue)); }
.chat-msg.user .chat-avatar { background: linear-gradient(135deg, var(--accent-green), #047857); }
.chat-bubble {
    padding: 12px 16px; border-radius: 12px; font-size: 14px; line-height: 1.7;
    word-break: break-word; color: var(--ink-800);
    box-shadow: var(--shadow-xs);
}
.chat-msg.bot .chat-bubble { background: #fff; border-top-left-radius: 4px; border: 1px solid var(--slate-200); }
.chat-msg.user .chat-bubble { background: linear-gradient(135deg, var(--brand-500), #6d28d9); color: #fff; border-top-right-radius: 4px; }
.chat-bubble p { margin: 0; }
.chat-bubble pre { background: #1e293b; color: #e2e8f0; padding: 12px 14px; border-radius: 8px; overflow-x: auto; margin: 8px 0; font-size: 12.5px; }
.chat-bubble code { font-family: "SF Mono", Consolas, monospace; font-size: 13px; }
.chat-bubble:not(pre) code { background: rgba(124,58,237,.08); color: var(--brand-500); padding: 1px 6px; border-radius: 4px; }
.chat-msg.error .chat-bubble { background: #fee2e2; color: #991b1b; border-color: #fca5a5; }
.chat-msg.typing .chat-bubble { color: var(--ink-400); font-style: italic; }
.chat-msg.typing .chat-bubble::after {
    content: '…'; animation: typing 1.2s steps(3, jump-none) infinite;
}
@keyframes typing { from { opacity: .33 } 33% { opacity: 1 } 66% { opacity: .33 } to { opacity: .33 } }

.chat-input-bar {
    padding: 16px 22px; border-top: 1px solid var(--slate-200);
    background: #fff; display: flex; gap: 12px; align-items: flex-end;
}
.chat-input-bar textarea {
    flex: 1; resize: none; padding: 12px 14px; border: 1px solid var(--slate-300);
    border-radius: 10px; font-size: 14px; line-height: 1.5; min-height: 48px; max-height: 160px;
    font-family: inherit; color: var(--ink-800); background: #fff;
    transition: all .18s;
}
.chat-input-bar textarea:focus { outline: none; border-color: var(--brand-400); box-shadow: 0 0 0 3px rgba(124,58,237,.12); }
.chat-input-bar .send-btn {
    width: 48px; height: 48px; border-radius: 10px; border: none;
    background: linear-gradient(135deg, var(--brand-500), #6d28d9); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; cursor: pointer; transition: all .18s; flex-shrink: 0;
    box-shadow: 0 4px 14px rgba(124,58,237,.3);
}
.chat-input-bar .send-btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-brand); }
.chat-input-bar .send-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.chat-quick-row { padding: 0 22px 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.chat-quick-btn {
    padding: 4px 12px; border-radius: 999px; border: 1px solid var(--slate-200);
    background: #fff; color: var(--ink-500); font-size: 12px; cursor: pointer; transition: all .18s;
}
.chat-quick-btn:hover { border-color: var(--brand-400); color: var(--brand-500); background: var(--brand-50); }

@media (max-width: 1024px) {
    .chat-wrap { grid-template-columns: 1fr; height: auto; }
    .chat-sidebar { max-height: 300px; }
}

@media (max-width: 1024px) {
    .app-sidebar { width: 72px; }
    .sidebar-brand-text, .sidebar-brand-sub, .sidebar-nav a span, .sidebar-section-label, .sidebar-logout-btn span { display: none; }
    .sidebar-brand { padding: 22px 10px; justify-content: center; }
    .app-main { margin-left: 72px; }
    .sidebar-nav a { justify-content: center; padding: 11px; }
    .sidebar-nav a.active::before { display: none; }
    .sidebar-logout-btn { justify-content: center; padding: 10px; }
}
@media (max-width: 640px) {
    .app-content { padding: 18px; }
    .stat-grid { grid-template-columns: 1fr; }
    .app-topbar { padding: 0 18px; }
    .topbar-user-name { display: none; }
}

/* ====== 自定义确认弹窗 ====== */
.confirm-mask {
    position: fixed; inset: 0; background: rgba(15,23,42,.45);
    backdrop-filter: blur(4px); z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; transition: opacity .22s ease;
}
.confirm-mask.show { opacity: 1; }
.confirm-box {
    background: #fff; border-radius: 16px; padding: 32px 28px 22px;
    width: 380px; max-width: 92vw; text-align: center;
    box-shadow: 0 20px 60px rgba(15,23,42,.25);
    transform: scale(.9) translateY(10px); transition: transform .25s cubic-bezier(.21,1.02,.73,1);
}
.confirm-mask.show .confirm-box { transform: scale(1) translateY(0); }
.confirm-icon {
    width: 60px; height: 60px; margin: 0 auto 18px;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-size: 28px;
}
.confirm-icon.danger { background: linear-gradient(135deg,#fee2e2,#fecaca); color: #dc2626; }
.confirm-icon.warning { background: linear-gradient(135deg,#fef3c7,#fde68a); color: #d97706; }
.confirm-icon.info { background: linear-gradient(135deg,#dbeafe,#bfdbfe); color: #2563eb; }
.confirm-title { font-size: 17px; font-weight: 600; color: var(--ink-800); margin-bottom: 8px; }
.confirm-desc { font-size: 13px; color: var(--ink-500); line-height: 1.6; margin-bottom: 24px; }
.confirm-actions { display: flex; gap: 10px; justify-content: center; }
.confirm-actions .btn { padding: 9px 22px; font-size: 14px; border-radius: 10px; cursor: pointer; border: none; font-weight: 500; transition: all .18s; }
.confirm-actions .btn-cancel { background: #f1f5f9; color: var(--ink-600); }
.confirm-actions .btn-cancel:hover { background: #e2e8f0; }
.confirm-actions .btn-ok { color: #fff; }
.confirm-actions .btn-ok:hover { transform: translateY(-1px); }