:root{--bg: #EAF6FD;--bg2: #FFFFFF;--bg3: #FFFFFF;--bg4: #E3F1FA;--border: #CFE3EF;--blue: #A20808;--teal: #0DC143;--coral: #C40E2E;--gold: #FF8044;--navy: #001F3F;--text: #1A1A1A;--muted: #5B6B78;--muted2: #94A3AD;--r: 14px;--ff: "Sora", sans-serif;--fd: "Playfair Display", serif;--fm: "JetBrains Mono", monospace}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;background:var(--bg);color:var(--text);font-family:var(--ff);font-size:14px;overflow:hidden}#app{height:100vh;height:100dvh;display:flex;flex-direction:column;overflow:hidden}::-webkit-scrollbar{width:3px;height:3px}::-webkit-scrollbar-thumb{background:var(--blue);border-radius:99px}.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:9px;border:none;font-family:var(--ff);font-size:13px;font-weight:600;cursor:pointer;transition:transform .15s,box-shadow .15s}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--blue);color:#fff}.btn-primary:not(:disabled):hover{transform:translateY(-2px);box-shadow:0 8px 24px #a2080859}.btn-secondary{background:transparent;border:1px solid var(--border);color:var(--muted)}.btn-secondary:hover{border-color:var(--blue);color:var(--blue)}.btn-danger{background:#c40e2e1f;border:1px solid rgba(196,14,46,.3);color:var(--coral)}.btn-danger:hover{background:#c40e2e38}.btn-sm{padding:6px 13px;font-size:12px}.btn-icon{padding:8px;border-radius:8px;background:transparent;border:1px solid var(--border);color:var(--muted);cursor:pointer;transition:all .2s;font-size:15px}.btn-icon:hover{border-color:var(--blue);color:var(--blue)}input[type=text],input[type=email],input[type=password],textarea,select{background:var(--bg4);border:1px solid var(--border);color:var(--text);font-family:var(--ff);font-size:13px;padding:10px 13px;border-radius:9px;outline:none;width:100%;transition:border-color .2s}input:focus,textarea:focus,select:focus{border-color:var(--blue)}select{-moz-appearance:none;appearance:none;-webkit-appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='7' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23A20808' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:32px}select option{background:var(--bg4)}select:disabled{opacity:.35;cursor:not-allowed}textarea{resize:vertical;line-height:1.6;min-height:100px}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:11px;color:var(--muted);font-weight:500;letter-spacing:.5px;text-transform:uppercase}.card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--r);padding:20px;transition:border-color .2s}.card:hover{border-color:#a208084d}.tag{padding:2px 9px;border-radius:20px;font-size:10.5px;font-weight:500;display:inline-block}.tag-grade{background:#a2080826;color:var(--blue)}.tag-subject{background:#0dc1431f;color:var(--teal)}.tag-topic{background:#ff80441f;color:var(--gold)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:40px;opacity:.5;text-align:center}.empty-state .icon{font-size:38px}.empty-state p{font-size:13.5px;color:var(--muted);max-width:280px;line-height:1.6}@keyframes fadeUp{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes bounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-6px)}}@keyframes glow{0%,to{box-shadow:0 0 16px #a2080826}50%{box-shadow:0 0 28px #a2080859}}.fade-up{animation:fadeUp .4s ease forwards}.fade-in{animation:fadeIn .3s ease forwards}.spinner{width:20px;height:20px;border-radius:50%;border:2px solid rgba(162,8,8,.2);border-top-color:var(--blue);animation:spin .7s linear infinite;flex-shrink:0}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bf;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}.modal-box{background:var(--bg2);border:1px solid rgba(162,8,8,.28);border-radius:16px;width:100%;max-width:580px;max-height:90vh;display:flex;flex-direction:column;overflow:hidden;animation:fadeUp .3s ease}.modal-header{padding:17px 22px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}.modal-header h3{font-family:var(--fd);font-size:18px}.modal-body{flex:1;overflow-y:auto;padding:20px 22px;display:flex;flex-direction:column;gap:14px}.modal-footer{padding:14px 22px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:10px;flex-shrink:0}.scroll-area{flex:1;overflow-y:auto}.divider{border:none;border-top:1px solid var(--border);margin:4px 0}@media (max-width: 640px){.hide-mobile{display:none!important}}