:root{--color-primary:#1a56db;--color-primary-light:#3b82f6;--color-primary-dark:#1e40af;--color-primary-50:#eff6ff;--color-primary-100:#dbeafe;--color-primary-200:#bfdbfe;--color-accent:#f59e0b;--color-accent-light:#fbbf24;--color-success:#10b981;--color-success-light:#d1fae5;--color-warning:#f59e0b;--color-warning-light:#fef3c7;--color-error:#ef4444;--color-error-light:#fee2e2;--color-bg:#f8fafc;--color-surface:#fff;--color-border:#e2e8f0;--color-border-light:#f1f5f9;--color-text:#1e293b;--color-text-secondary:#64748b;--color-text-muted:#94a3b8;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--text-xs:.75rem;--text-sm:.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -2px #0000000d;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -4px #0000000a;--shadow-xl:0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000000f;--shadow-glow:0 0 20px #1a56db26;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-base:.25s cubic-bezier(.4, 0, .2, 1);--transition-slow:.35s cubic-bezier(.4, 0, .2, 1);--transition-bounce:.5s cubic-bezier(.34, 1.56, .64, 1);--z-dropdown:10;--z-sticky:20;--z-modal:100;--z-toast:200;--color-beginner:#10b981;--color-beginner-bg:#d1fae5;--color-intermediate:#f59e0b;--color-intermediate-bg:#fef3c7;--color-advanced:#ec4899;--color-advanced-bg:#fce7f3;--color-score-excellent:#10b981;--color-score-good:#3b82f6;--color-score-fair:#f59e0b;--color-score-poor:#ef4444}[data-theme=dark]{--color-primary:#60a5fa;--color-primary-light:#93c5fd;--color-primary-dark:#3b82f6;--color-primary-50:#3b82f61a;--color-primary-100:#3b82f626;--color-primary-200:#3b82f633;--color-accent:#fbbf24;--color-accent-light:#fcd34d;--color-success:#34d399;--color-success-light:#10b98126;--color-warning:#fbbf24;--color-warning-light:#f59e0b26;--color-error:#f87171;--color-error-light:#ef444426;--color-bg:#0f172a;--color-surface:#1e293b;--color-border:#334155;--color-border-light:#1e293b;--color-text:#f1f5f9;--color-text-secondary:#94a3b8;--color-text-muted:#64748b;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 6px -1px #0006;--shadow-lg:0 10px 15px -3px #00000080;--shadow-xl:0 20px 25px -5px #00000080;--shadow-glow:0 0 20px #60a5fa33;--color-beginner:#34d399;--color-beginner-bg:#10b98126;--color-intermediate:#fbbf24;--color-intermediate-bg:#f59e0b26;--color-advanced:#f472b6;--color-advanced-bg:#ec489926;--color-score-excellent:#34d399;--color-score-good:#60a5fa;--color-score-fair:#fbbf24;--color-score-poor:#f87171}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}:focus-visible{outline:2px solid var(--color-primary-light);outline-offset:2px}button{font-family:inherit;font-size:inherit;cursor:pointer;background:0 0;border:none}button:disabled{cursor:not-allowed;opacity:.5}a{color:inherit;text-decoration:none}@keyframes fade-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes scale-in{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes slide-up{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse-ring{0%{opacity:.6;transform:scale(1)}to{opacity:0;transform:scale(1.6)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes bounce-subtle{0%,to{transform:translateY(0)}50%{transform:translateY(-3px)}}.animate-fade-in{animation:fade-in var(--transition-base) both}.animate-scale-in{animation:scale-in var(--transition-base) both}#app{flex-direction:column;min-height:100vh;display:flex}.navbar{padding:var(--space-4) var(--space-8);background:var(--color-surface);border-bottom:1px solid var(--color-border);z-index:var(--z-sticky);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#ffffffeb;justify-content:space-between;align-items:center;display:flex;position:sticky;top:0}.brand{align-items:center;gap:var(--space-2);display:flex}.brand-icon{font-size:1.5rem}.brand-text{font-size:var(--text-xl);background:linear-gradient(135deg, var(--color-primary), var(--color-primary-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-weight:800}.nav-links{gap:var(--space-2);display:flex}.nav-link{align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);border-radius:var(--radius-full);font-size:var(--text-sm);color:var(--color-text-secondary);transition:all var(--transition-fast);font-weight:500;display:flex}.nav-link:hover{background:var(--color-primary-50);color:var(--color-primary)}.nav-link.active{background:var(--color-primary-100);color:var(--color-primary);font-weight:600}.nav-icon{font-size:1.1rem}main{width:100%;max-width:1100px;padding:var(--space-8);padding-bottom:calc(var(--space-8) + 80px);flex:1;margin:0 auto}.page-enter-active,.page-leave-active{transition:opacity .2s,transform .2s}.page-enter-from{opacity:0;transform:translateY(8px)}.page-leave-to{opacity:0;transform:translateY(-4px)}.tab-bar{background:var(--color-surface);border-top:1px solid var(--color-border);padding:var(--space-2) 0;padding-bottom:env(safe-area-inset-bottom,var(--space-2));z-index:var(--z-sticky);display:none;position:fixed;bottom:0;left:0;right:0}.tab-item{padding:var(--space-1) var(--space-3);color:var(--color-text-muted);font-size:var(--text-xs);transition:color var(--transition-fast);flex-direction:column;align-items:center;gap:2px;display:flex}.tab-item.active{color:var(--color-primary)}.tab-item.active .tab-icon{transform:scale(1.1)}.tab-icon{transition:transform var(--transition-bounce);font-size:1.3rem}.tab-label{font-weight:500}.nav-auth{align-items:center;gap:var(--space-3);display:flex}.user-badge{font-size:var(--text-sm);color:var(--color-text-secondary);padding:var(--space-1) var(--space-3);background:var(--color-primary-50);border-radius:var(--radius-full);font-weight:500}.logout-btn{font-size:var(--text-sm);color:var(--color-text-muted);padding:var(--space-1) var(--space-2);border-radius:var(--radius-sm);transition:color var(--transition-fast)}.logout-btn:hover{color:var(--color-error)}.login-btn{font-size:var(--text-sm);color:var(--color-primary);padding:var(--space-2) var(--space-4);border:1px solid var(--color-primary);border-radius:var(--radius-full);transition:all var(--transition-fast);font-weight:600}.login-btn:hover{background:var(--color-primary);color:#fff}.nav-settings-btn{padding:var(--space-1);opacity:.7;transition:opacity var(--transition-fast);font-size:1.2rem}.nav-settings-btn:hover{opacity:1}@media (width<=768px){.navbar{padding:var(--space-3) var(--space-4)}.nav-links{display:none}.tab-bar{justify-content:space-around;display:flex}main{padding:var(--space-4);padding-bottom:100px}}