:root{--color-primary: #f5f8fc;--color-secondary: #25324b;--color-accent: #dceeff;--color-surface: #ffffff;--color-neutral: #e6f6f1;--color-error: #b43d58;--color-warning: #916d22;--color-success: #26745d;--color-border: #dce4ef;--shadow-soft: 0 12px 32px rgba(53, 79, 112, .1);--radius: 16px;--space-1: .5rem;--space-2: 1rem;--space-3: 1.5rem;--space-4: 2rem;font-family:Montserrat,system-ui,sans-serif;color:var(--color-secondary);background:var(--color-primary)}*{box-sizing:border-box}html,body,#root{min-width:320px;min-height:100%;margin:0}body{min-height:100dvh;background:linear-gradient(135deg,#f5f8fc,#eef6fb);color:var(--color-secondary)}button,input,select,textarea{font:inherit}button,input,select,textarea{border:1px solid var(--color-border);border-radius:8px;padding:.75rem}button{cursor:pointer;color:var(--color-secondary);background:var(--color-accent);font-weight:600;transition:transform .16s ease,box-shadow .16s ease,background .16s ease}button:hover:not(:disabled){transform:translateY(-1px)}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--color-secondary);outline-offset:2px}button:disabled{cursor:not-allowed;opacity:.58}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.25rem,5vw,4rem)}h2{font-size:1.5rem}p{max-width:72ch;line-height:1.6}.shell,.auth-shell{display:grid;place-items:center;min-height:100dvh;padding:var(--space-3)}.auth-card{max-width:480px}.eyebrow{color:var(--color-success);font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.auth-error{margin-top:var(--space-2);color:var(--color-error);font-weight:600}.card,.ui-card{width:min(100%,720px);padding:clamp(1.25rem,5vw,4rem);background:#ffffffeb;border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-soft)}.ui-button{min-height:44px;margin:.25rem;padding-inline:1rem}.ui-input{width:100%;min-height:44px;background:#fff}.ui-checkbox{width:1.25rem;height:1.25rem;accent-color:var(--color-success)}label{display:grid;gap:.4rem;margin:var(--space-2) 0;text-align:left;font-weight:500}.checkbox{display:flex;align-items:center;gap:.5rem}.answers{display:grid;grid-template-columns:repeat(5,minmax(44px,1fr));gap:.5rem;margin:var(--space-4) 0 var(--space-2)}.answers button{min-height:52px;font-size:1.1rem}.answer-hints{display:flex;justify-content:space-between;gap:1rem;font-size:.875rem}.ghost{background:transparent}progress{width:100%;accent-color:var(--color-success)}.interpretation{padding:var(--space-2) 0;border-bottom:1px solid var(--color-border);text-align:left}.feedback{margin-top:var(--space-4);text-align:left}textarea{min-height:6rem;resize:vertical}.staff-layout{display:grid;grid-template-columns:240px minmax(0,1fr);min-height:100dvh}.sidebar{position:sticky;top:0;z-index:100;display:grid;align-content:start;gap:.75rem;height:100dvh;padding:var(--space-4) var(--space-2);background:#fffffff0;border-right:1px solid var(--color-border)}.sidebar h1{margin:0 0 var(--space-3);font-size:1.8rem}.sidebar button{margin:0;text-align:left}.nav-active{border-left:4px solid var(--color-success);background:var(--color-accent)}.staff-main{width:min(100%,1280px);padding:var(--space-4) clamp(1rem,4vw,4rem);overflow-wrap:anywhere}.staff-main header{display:flex;justify-content:space-between;align-items:center;gap:var(--space-2);margin-bottom:var(--space-4)}.create-row{display:flex;flex-wrap:wrap;gap:.75rem;margin:var(--space-2) 0 var(--space-4)}.create-row input{flex:1 1 220px}.class-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--space-2)}.class-card{width:auto;padding:1.25rem}.stats{display:flex;flex-wrap:wrap;gap:var(--space-2);padding:var(--space-2);margin-bottom:var(--space-2);background:var(--color-neutral);border-radius:var(--radius)}.code-list{list-style:none;padding:0;margin:0}.code-list li{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;padding:.75rem;border-bottom:1px solid var(--color-border)}code{font-family:JetBrains Mono,monospace;letter-spacing:.08em}.menu-toggle{display:none}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:300;display:grid;place-items:center;padding:var(--space-2);background:#2d2d2d73}.modal{width:min(100%,640px);max-height:90dvh;overflow:auto;padding:var(--space-3);background:var(--color-surface);border-radius:var(--radius);box-shadow:var(--shadow-soft)}.modal-header{display:flex;justify-content:space-between;gap:var(--space-2);align-items:start}.toast{position:fixed;right:var(--space-2);bottom:var(--space-2);z-index:500;max-width:min(90vw,28rem);padding:1rem;border-radius:8px;box-shadow:var(--shadow-soft);background:#fff}.toast-success{border-left:4px solid var(--color-success)}.toast-warning{border-left:4px solid var(--color-warning)}.toast-error{border-left:4px solid var(--color-error)}.skeleton{display:grid;gap:.75rem}.skeleton span{display:block;height:1rem;border-radius:6px;background:linear-gradient(90deg,var(--color-surface),#fff,var(--color-surface));opacity:.8}.empty-state{display:grid;justify-items:center;gap:.5rem;padding:var(--space-4);text-align:center;border:1px dashed var(--color-border);border-radius:var(--radius)}.empty-state-icon{font-size:2rem}.pagination{display:flex;align-items:center;justify-content:center;gap:var(--space-2);margin-top:var(--space-3)}@media(max-width:767px){.staff-layout{display:block}.menu-toggle{display:block;position:fixed;top:.75rem;right:.75rem;z-index:150}.sidebar{position:static;width:auto;height:auto;transform:none;display:flex;flex-wrap:wrap;align-items:center}.sidebar h1{width:100%;margin:0}.staff-main{padding:1rem}.answers{grid-template-columns:repeat(5,minmax(0,1fr))}.card{padding:1.25rem}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}button:hover:not(:disabled){transform:none}}