:root{--primary:#3b82f6;--primary-dark:#2563eb;--primary-light:#dbeafe;--accent:#f59e0b;--accent-light:#fef3c7;--success:#10b981;--success-light:#d1fae5;--danger:#ef4444;--danger-light:#fee2e2;--text:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--bg:#f5f7fb;--card:#ffffff;--border:#e2e8f0;--radius:16px;--radius-sm:10px;--shadow:0 1px 3px rgba(15,23,42,0.06),0 4px 12px rgba(15,23,42,0.05);--shadow-lg:0 8px 30px rgba(15,23,42,0.12);--nav-height:60px;--header-height:52px;--font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body,html{font-family:var(--font);background:var(--bg);color:var(--text);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}input,textarea{font-family:inherit;font-size:16px}.app-shell{max-width:480px;margin:0 auto;min-height:100vh;min-height:100dvh;background:var(--bg);position:relative}.page{padding:16px;padding-bottom:calc(var(--nav-height) + 32px)}.page,.page-no-nav{min-height:100vh;min-height:100dvh}.page-no-nav{padding:16px}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:50;height:var(--header-height);display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:rgba(255,255,255,.85);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.topbar-title{font-size:17px;font-weight:700}.topbar-back{width:32px;height:32px;justify-content:center;border-radius:8px;font-size:20px;color:var(--text)}.topbar-back,.topbar-right{display:flex;align-items:center}.topbar-right{min-width:32px;justify-content:flex-end}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;height:var(--nav-height);background:rgba(255,255,255,.95);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--border);display:flex;z-index:100;padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{flex:1 1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--text-muted);font-size:11px;transition:color .15s}.bottom-nav a .nav-icon{font-size:22px;line-height:1}.bottom-nav a.active{color:var(--primary);font-weight:600}.card{background:var(--card);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);margin-bottom:12px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 20px;border-radius:12px;font-size:16px;font-weight:600;transition:all .15s;width:100%}.btn:active{transform:scale(.98)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:active{background:var(--primary-dark)}.btn-outline{background:#fff;color:var(--primary);border:1.5px solid var(--primary)}.btn-ghost{background:var(--primary-light);color:var(--primary-dark)}.btn-danger{background:var(--danger);color:#fff}.btn-lg{padding:15px 24px;font-size:17px}.btn:disabled{opacity:.5;cursor:not-allowed}.field{margin-bottom:16px}.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px;color:var(--text)}.field input{width:100%;padding:13px 14px;border:1.5px solid var(--border);border-radius:12px;font-size:16px;outline:none;transition:border-color .15s;background:#fff}.field input:focus{border-color:var(--primary)}.error-text{color:var(--danger);font-size:13px;margin-top:6px}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}.badge-primary{background:var(--primary-light);color:var(--primary-dark)}.badge-accent{background:var(--accent-light);color:#b45309}.badge-success{background:var(--success-light);color:#047857}.badge-danger{background:var(--danger-light);color:#b91c1c}.list-item{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--border)}.list-item:last-child{border-bottom:none}.flex,.flex-col{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-3{gap:12px}.text-center{text-align:center}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.text-sm{font-size:13px}.text-xs{font-size:12px}.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.w-full{width:100%}.skeleton{background:linear-gradient(90deg,#eef1f6 25%,#f7f9fc 50%,#eef1f6 75%);background-size:200% 100%;animation:shimmer 1.4s infinite;border-radius:8px}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.article-content{font-size:15.5px;line-height:1.8;color:var(--text)}.article-content h2{font-size:18px;font-weight:700;margin:20px 0 10px;padding-left:10px;border-left:3px solid var(--primary)}.article-content h3{font-size:16px;font-weight:700;margin:16px 0 8px}.article-content p{margin:10px 0}.article-content ol,.article-content ul{padding-left:20px;margin:10px 0}.article-content li{margin:4px 0}.article-content table{width:100%;border-collapse:collapse;margin:12px 0;font-size:14px;display:block;overflow-x:auto}.article-content table td,.article-content table th{border:1px solid var(--border);padding:8px 10px;text-align:left}.article-content table th{background:var(--primary-light);font-weight:600}.article-content blockquote{border-left:3px solid var(--accent);background:var(--accent-light);padding:8px 12px;margin:10px 0;border-radius:0 8px 8px 0;color:#92400e}.article-content code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:14px}@keyframes fadeInUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeInUp .3s ease}.flip-card{perspective:1200px}.flip-inner{position:relative;width:100%;transition:transform .4s;transform-style:preserve-3d}.flip-inner.flipped{transform:rotateY(180deg)}.flip-face{backface-visibility:hidden;-webkit-backface-visibility:hidden}.flip-back{position:absolute;top:0;left:0;width:100%;transform:rotateY(180deg)}