:root{--color-canvas: #0a1422;--color-surface: #0f2034;--color-surface-raised: #14283f;--color-surface-higher: #1a3047;--color-border: #1f3a57;--color-border-strong: #2b4d70;--color-text: #e8f1fb;--color-text-dim: #9fb3c8;--color-text-faint: #6b839c;--color-learn: #2bd4ef;--color-accomp: #ff8a5c;--color-review: #fbbf24;--color-community: #34d399;--color-success: #34d399;--color-warn: #fbbf24;--color-danger: #f87171;--color-info: #2bd4ef;--theme: var(--color-learn);--font-sans: "Inter", "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;--radius-sm: 8px;--radius: 12px;--radius-lg: 18px;--shadow-1: 0 2px 8px rgba(0, 0, 0, .3);--shadow-2: 0 8px 24px rgba(0, 0, 0, .4);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--sidebar-w: 264px;--tabbar-h: 64px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font-sans);background:var(--color-canvas);color:var(--color-text);-webkit-font-smoothing:antialiased;line-height:1.5}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer}input,textarea,select{font-family:inherit}.app-shell{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--color-surface);border-right:1px solid var(--color-border);padding:var(--space-5) var(--space-4);position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:var(--space-2)}.brand{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-3);margin-bottom:var(--space-4)}.brand-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--color-learn),var(--color-accomp));display:grid;place-items:center;color:#06121f;font-weight:800}.brand-name{font-weight:700;font-size:16px;letter-spacing:.5px}.brand-sub{font-size:11px;color:var(--color-text-faint)}.nav-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);border-radius:var(--radius-sm);color:var(--color-text-dim);font-size:14px;transition:all .15s;border:1px solid transparent}.nav-item:hover{background:var(--color-surface-raised);color:var(--color-text)}.nav-item.active{background:var(--color-surface-raised);color:var(--color-text);border-color:var(--color-border-strong)}.nav-item .dot{width:8px;height:8px;border-radius:50%;background:var(--theme)}.main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{height:56px;border-bottom:1px solid var(--color-border);display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-5);background:#0a1422cc;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;top:0;z-index:10}.content{padding:var(--space-5);max-width:1080px;width:100%;margin:0 auto}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:var(--space-5);box-shadow:var(--shadow-1)}.card-hover{transition:border-color .15s,transform .15s;cursor:pointer}.card-hover:hover{border-color:var(--color-border-strong);transform:translateY(-2px)}.grid{display:grid;gap:var(--space-4)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-auto{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.h1{font-size:24px;font-weight:700;margin:0 0 var(--space-2)}.h2{font-size:18px;font-weight:650;margin:0 0 var(--space-3)}.muted{color:var(--color-text-dim)}.faint{color:var(--color-text-faint)}.theme-text{color:var(--theme)}.btn{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);border-radius:var(--radius-sm);border:1px solid var(--color-border-strong);background:var(--color-surface-raised);color:var(--color-text);font-size:14px;font-weight:550;transition:all .15s}.btn:hover{border-color:var(--theme)}.btn-primary{background:var(--theme);color:#06121f;border-color:transparent;font-weight:650}.btn-primary:hover{filter:brightness(1.08)}.btn-ghost{background:transparent}.btn-danger{border-color:var(--color-danger);color:var(--color-danger)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-lg{padding:var(--space-3) var(--space-5);font-size:15px}.input,.textarea,.select{width:100%;padding:var(--space-3);border-radius:var(--radius-sm);background:var(--color-canvas);border:1px solid var(--color-border);color:var(--color-text);font-size:14px;outline:none;transition:border-color .15s}.input:focus,.textarea:focus,.select:focus{border-color:var(--theme)}.textarea{resize:vertical;min-height:96px}.field{margin-bottom:var(--space-4)}.field label{display:block;font-size:13px;color:var(--color-text-dim);margin-bottom:var(--space-2)}.badge{display:inline-flex;align-items:center;gap:4px;padding:2px 10px;border-radius:999px;font-size:12px;background:var(--color-surface-raised);color:var(--color-text-dim);border:1px solid var(--color-border)}.badge-theme{background:color-mix(in srgb,var(--theme) 18%,transparent);color:var(--theme);border-color:color-mix(in srgb,var(--theme) 40%,transparent)}.tag-row{display:flex;flex-wrap:wrap;gap:var(--space-2)}.empty{text-align:center;padding:var(--space-6);color:var(--color-text-faint)}.empty svg{margin-bottom:var(--space-3);opacity:.5}.progress{height:8px;background:var(--color-surface-raised);border-radius:999px;overflow:hidden}.progress>span{display:block;height:100%;background:var(--theme);border-radius:999px;transition:width .3s}.tabbar{display:none}@media (max-width: 768px){.sidebar{display:none}.tabbar{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:20;height:calc(var(--tabbar-h) + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--color-surface);border-top:1px solid var(--color-border);justify-content:space-around;align-items:center}.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;color:var(--color-text-faint);font-size:11px;padding:var(--space-2) 0}.tabbar a.active{color:var(--color-learn)}.tabbar .fab{width:52px;height:52px;border-radius:50%;background:var(--color-review);display:grid;place-items:center;color:#06121f;margin-top:-18px;box-shadow:var(--shadow-2)}.content{padding:var(--space-4);padding-bottom:calc(var(--tabbar-h) + var(--space-6))}.grid-2,.grid-3{grid-template-columns:1fr}}.skeleton{background:linear-gradient(90deg,var(--color-surface) 25%,var(--color-surface-raised) 50%,var(--color-surface) 75%);background-size:200% 100%;animation:shimmer 1.2s infinite;border-radius:var(--radius-sm)}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.fade-in{animation:fadeIn .25s ease-out}