:root{--primary: #6366f1;--secondary: #94a3b8;--bg: #0f172a;--sidebar: #1e293b;--card: rgba(30, 41, 59, .7);--text: #f8fafc;--border: rgba(255, 255, 255, .1);--success: #10b981;--danger: #ef4444}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,Pretendard,system-ui,-apple-system,sans-serif}body{background-color:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}.app-layout{display:flex;min-height:100vh;width:100%}.sidebar{width:260px;background:var(--sidebar);border-right:1px solid var(--border);padding:2rem 1rem;display:flex;flex-direction:column;gap:2.5rem;z-index:100;transition:transform .3s cubic-bezier(.4,0,.2,1)}.logo{display:flex;align-items:center;gap:.75rem;font-size:1.5rem;font-weight:800;color:var(--primary);padding:0 .5rem}.nav{display:flex;flex-direction:column;gap:.5rem}.nav-item{background:none;border:none;padding:.875rem 1rem;border-radius:.75rem;cursor:pointer;display:flex;align-items:center;gap:1rem;color:#94a3b8;font-size:1rem;font-weight:500;transition:all .2s;text-align:left;width:100%}.nav-item:hover{background:#ffffff0d;color:#fff}.nav-item.active{background:var(--primary);color:#fff;box-shadow:0 4px 12px #6366f14d}.main{flex:1;padding:3rem;overflow-y:auto;position:relative;width:100%}.header{margin-bottom:3rem}.header h1{font-size:2.25rem;font-weight:800;margin-bottom:.5rem}.header p{color:var(--secondary);font-size:1.125rem}.mobile-menu-btn{display:none;position:fixed;top:1.5rem;right:1.5rem;z-index:200;background:var(--primary);border:none;color:#fff;width:3.5rem;height:3.5rem;border-radius:1rem;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 8px 16px #0000004d}.card{background:var(--card);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border);border-radius:1.5rem;padding:2.5rem;box-shadow:0 20px 25px -5px #0003;max-width:900px}.field{display:flex;flex-direction:column;gap:.625rem;margin-bottom:1.5rem}.field label{font-weight:600;font-size:.875rem;color:var(--secondary);text-transform:uppercase}textarea,input[type=text],input[type=number],select{background:#0f172acc;border:1px solid var(--border);padding:.875rem 1rem;border-radius:.75rem;color:#fff;font-size:1rem;outline:none}textarea:focus,input:focus,select:focus{border-color:var(--primary)}.qr-grid{display:grid;grid-template-columns:1fr 300px;gap:3rem}.row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.preview-pane{display:flex;align-items:center;justify-content:center}.qr-box{background:#fff;padding:1.25rem;border-radius:1.25rem}.qr-box canvas{max-width:100%;height:auto!important}.btn{padding:.875rem 1.5rem;border-radius:.75rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.75rem;border:none;transition:transform .1s}.btn.primary{background:var(--primary);color:#fff}.btn.secondary{background:#334155;color:#fff}.btn.full{width:100%}.actions{display:flex;gap:1rem;margin-top:1rem;flex-wrap:wrap}.timer-display{font-size:5rem;font-weight:800;color:var(--primary);margin-bottom:2rem;text-align:center;font-family:monospace}.timer-controls{display:flex;justify-content:center;gap:1.5rem;margin-bottom:2.5rem}.timer-presets{display:flex;justify-content:center;gap:.75rem;flex-wrap:wrap}.timer-presets button{background:#ffffff0d;color:#fff;border:1px solid var(--border);padding:.5rem 1rem;border-radius:2rem;cursor:pointer}.toast{position:fixed;top:1.5rem;left:50%;transform:translate(-50%);background:var(--primary);color:#fff;padding:.75rem 1.5rem;border-radius:2rem;font-weight:600;z-index:1000;box-shadow:0 10px 15px #0003}@media(max-width:1024px){.qr-grid{grid-template-columns:1fr;gap:2rem}.preview-pane{order:-1}.sidebar{position:fixed;left:0;top:0;bottom:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.mobile-menu-btn{display:flex}.sidebar-overlay{position:fixed;inset:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:90}.main{padding:6rem 1.5rem 2rem}.header h1{font-size:1.75rem}.card{padding:1.5rem}.timer-display{font-size:4rem}}@media(max-width:640px){.actions .btn{width:100%}.row,.options-grid,.unit-grid{grid-template-columns:1fr}.pass-display{flex-direction:column}}