:root{--bg-color: #f8fafc;--surface-color: #ffffff;--text-primary: #0f172a;--text-secondary: #475569;--primary-color: #0ea5e9;--primary-hover: #0284c7;--border-color: #e2e8f0;--error-color: #ef4444;--success-color: #10b981;--input-bg: #ffffff;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--radius: .5rem}[data-theme=dark]{--bg-color: #0f172a;--surface-color: #1e293b;--text-primary: #f8fafc;--text-secondary: #94a3b8;--primary-color: #38bdf8;--primary-hover: #7dd3fc;--border-color: #334155;--input-bg: #0f172a;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .5);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .5), 0 2px 4px -2px rgb(0 0 0 / .5)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-primary);transition:background-color .3s ease,color .3s ease;line-height:1.5}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;color:var(--text-primary)}a{color:var(--primary-color);text-decoration:none}.container{max-width:1200px;margin:0 auto;padding:2rem 1rem}input,select,textarea{width:100%;padding:.75rem 1rem;border:1px solid var(--border-color);border-radius:var(--radius);background-color:var(--input-bg);color:var(--text-primary);font-family:inherit;font-size:1rem;transition:border-color .2s}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #0ea5e91a}button{background-color:var(--primary-color);color:#fff;border:none;padding:.75rem 1.5rem;border-radius:var(--radius);font-weight:500;font-size:1rem;cursor:pointer;transition:background-color .2s,transform .1s}button:hover{background-color:var(--primary-hover)}button:active{transform:translateY(1px)}button:disabled{opacity:.5;cursor:not-allowed}button.secondary{background-color:transparent;color:var(--text-primary);border:1px solid var(--border-color)}button.secondary:hover{background-color:var(--surface-color);border-color:var(--text-primary)}button.danger{background-color:var(--error-color);color:#fff}.card{background-color:var(--surface-color);border:1px solid var(--border-color);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow-sm);transition:box-shadow .3s ease,transform .3s ease,border-color .3s ease}.card:hover{box-shadow:var(--shadow-md);border-color:#38bdf84d}.glass-panel{background:#1e293b66;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.05);border-radius:1rem;box-shadow:0 8px 32px #0003}[data-theme=light] .glass-panel{background:#ffffffb3;border:1px solid rgba(0,0,0,.05);box-shadow:0 8px 32px #1f268712}.premium-btn{background:linear-gradient(135deg,#0ea5e9,#3b82f6);color:#fff;border:none;font-weight:600;text-transform:uppercase;letter-spacing:1px;box-shadow:0 4px 15px #0ea5e966;transition:all .3s ease}.premium-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #0ea5e999;background:linear-gradient(135deg,#0284c7,#2563eb)}.flex{display:flex}.grid{display:grid}.flex-col{display:flex;flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:.5rem}.gap-4{gap:1rem}.mt-4{margin-top:1rem}.mb-4{margin-bottom:1rem}.text-center{text-align:center}.text-sm{font-size:.875rem}.text-secondary{color:var(--text-secondary)}.header{background-color:var(--surface-color);border-bottom:1px solid var(--border-color);padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:10}.brand{font-size:1.5rem;font-weight:700;color:var(--primary-color);letter-spacing:-.5px;display:flex;align-items:center;gap:.5rem}.nav-links{display:flex;gap:1.5rem;align-items:center}.nav-links a{color:var(--text-secondary);font-weight:500;transition:color .2s}.nav-links a:hover,.nav-links a.active{color:var(--primary-color)}.header-top{display:flex;justify-content:space-between;align-items:center}.theme-toggle-mobile{display:none;padding:.5rem}.theme-toggle-desktop{display:flex;padding:.5rem}@media (max-width: 768px){.container{padding:1rem .5rem}.header{flex-direction:column;padding:1rem;gap:1rem}.header-top{width:100%}.theme-toggle-mobile{display:flex}.theme-toggle-desktop{display:none}.nav-links{width:100%;justify-content:center;flex-wrap:wrap;gap:1rem}input,select,textarea{padding:.6rem .75rem;font-size:16px}.card{padding:1rem}.modal-card{padding:1.25rem!important}.mobile-col{flex-direction:column!important;align-items:stretch!important}.mobile-mt{margin-top:1rem}.proto-grid{grid-template-columns:1fr!important}}.proto-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:1rem}.calc-row{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;border-bottom:1px solid var(--border-color)}.calc-label{flex:0 0 280px;font-weight:500;font-size:.95rem;color:var(--text-primary)}.calc-field{flex:1;padding:.7rem .9rem;font-size:1rem;border-radius:8px;border:1px solid var(--border-color);background:var(--input-bg);color:var(--text-primary);width:100%;min-width:0}@media (max-width: 768px){.calc-row{flex-direction:column;align-items:stretch;padding:1rem;gap:.5rem}.calc-label{flex:none;font-size:.9rem}}