:root,[data-theme=dark]{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-card: #1e293b;--bg-input: #334155;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #6366f1;--accent-hover: #818cf8;--success: #22c55e;--warning: #f59e0b;--danger: #ef4444;--border: #334155;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .3);--radius: 12px}[data-theme=light]{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-card: #ffffff;--bg-input: #f1f5f9;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--accent: #6366f1;--accent-hover: #4f46e5;--success: #16a34a;--warning: #d97706;--danger: #dc2626;--border: #e2e8f0;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .08)}*{margin:0;padding:0;box-sizing:border-box;transition:background-color .2s ease,color .2s ease,border-color .2s ease}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}.app-container{max-width:1200px;margin:0 auto;padding:0 16px 80px}.card{background:var(--bg-card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);border:1px solid var(--border)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.card-title{font-size:18px;font-weight:600}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:500;border:none;cursor:pointer;transition:all .2s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--bg-input);color:var(--text-primary)}.btn-secondary:hover{background:#475569}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:6px 12px;font-size:12px}.btn-block{width:100%;justify-content:center}.form-group{margin-bottom:16px}.form-label{display:block;font-size:13px;font-weight:500;color:var(--text-secondary);margin-bottom:6px}.form-input,.form-select{width:100%;padding:10px 14px;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);font-size:14px;outline:none;transition:border-color .2s}.form-input:focus,.form-select:focus{border-color:var(--accent)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.grid{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}.grid-3{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.grid-4{grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}.metric-card{background:var(--bg-card);border-radius:var(--radius);padding:16px;border:1px solid var(--border);text-align:center}.metric-value{font-size:28px;font-weight:700;color:var(--accent)}.metric-label{font-size:12px;color:var(--text-muted);margin-top:4px;text-transform:uppercase;letter-spacing:.5px}.metric-trend{font-size:12px;margin-top:8px}.trend-up{color:var(--success)}.trend-down{color:var(--danger)}.trend-stable{color:var(--text-muted)}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:var(--bg-secondary);border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:8px 0;z-index:100}.nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 12px;color:var(--text-muted);font-size:11px;cursor:pointer;transition:color .2s;background:none;border:none}.nav-item.active,.nav-item:hover{color:var(--accent)}.nav-item svg{width:22px;height:22px}.header{display:flex;justify-content:space-between;align-items:center;padding:16px 0}.header h1{font-size:24px;background:linear-gradient(135deg,var(--accent),#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}@media(max-width:640px){.form-row,.grid-2,.grid-3{grid-template-columns:1fr}}.auth-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:20px}.auth-card{width:100%;max-width:400px}.auth-title{text-align:center;margin-bottom:24px;font-size:28px;background:linear-gradient(135deg,var(--accent),#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.advice-text{line-height:1.7;color:var(--text-secondary)}.advice-text h1,.advice-text h2,.advice-text h3{color:var(--text-primary);margin-top:16px;margin-bottom:8px}.advice-text ul,.advice-text ol{padding-left:20px;margin-bottom:12px}.advice-text li{margin-bottom:4px}.advice-text p{margin-bottom:10px}.advice-text strong{color:var(--text-primary)}.advice-text code{background:var(--surface-secondary);padding:2px 6px;border-radius:4px;font-size:.9em}.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--text-muted)}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.alert{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}.alert-error{background:#ef444426;color:var(--danger);border:1px solid var(--danger)}.alert-success{background:#22c55e26;color:var(--success);border:1px solid var(--success)}.exercise-item{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border)}.exercise-item:last-child{border-bottom:none}.exercise-info h4{font-size:14px;margin-bottom:4px}.exercise-meta{font-size:12px;color:var(--text-muted)}