@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700;800&display=swap";:root{--bg-primary:#f5f7fa;--bg-secondary:#fff;--bg-tertiary:#eef2f7;--bg-hover:#00000008;--text-primary:#1e293b;--text-secondary:#64748b;--text-tertiary:#94a3b8;--border-color:#e2e8f0;--accent-primary:#4f46e5;--accent-secondary:#0ea5e9;--accent-tertiary:#6366f1;--accent-light:#eef2ff;--color-success:#10b981;--color-error:#ef4444;--color-warning:#f59e0b;--color-info:#0ea5e9;--radius-sm:6px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-2xl:20px;--radius-full:9999px;--shadow-xs:0 1px 2px #0000000d;--shadow-sm:0 1px 3px #00000014, 0 1px 2px #0000000a;--shadow-md:0 4px 6px #0000000f, 0 2px 4px #0000000a;--shadow-lg:0 10px 15px #00000014, 0 4px 6px #0000000a;--shadow-xl:0 20px 25px #0000001a, 0 8px 10px #0000000a}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;font-size:16px}body{background:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;overflow-x:hidden}#root{min-height:100vh}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}::selection{color:var(--text-primary);background:#4f46e526}a{color:var(--accent-primary);text-decoration:none;transition:color .2s}a:hover{color:var(--accent-tertiary)}.btn{border-radius:var(--radius-lg);cursor:pointer;white-space:nowrap;border:1px solid #0000;justify-content:center;align-items:center;gap:.5rem;min-height:44px;padding:.625rem 1.25rem;font-family:inherit;font-size:.875rem;font-weight:600;line-height:1.4;text-decoration:none;transition:all .2s;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn--primary{background:var(--accent-primary);color:#fff;box-shadow:var(--shadow-sm);border-color:#0000}.btn--primary:hover:not(:disabled){background:var(--accent-tertiary);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn--primary:active:not(:disabled){box-shadow:var(--shadow-sm);transform:translateY(0)}.btn--ghost{color:var(--text-secondary);border-color:var(--border-color);background:0 0}.btn--ghost:hover:not(:disabled){background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--text-tertiary)}.btn--danger{color:var(--color-error);background:#ef44440f;border-color:#ef444440}.btn--danger:hover:not(:disabled){background:#ef44441f;border-color:#ef444466}.btn--back{background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);box-shadow:var(--shadow-xs);gap:.4rem;font-weight:600}.btn--back:hover{background:var(--bg-tertiary);border-color:var(--text-tertiary);box-shadow:var(--shadow-sm)}.btn--sm{min-height:36px;padding:.4rem .85rem;font-size:.8rem}.btn--lg{min-height:48px;padding:.75rem 1.5rem;font-size:.95rem}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-16px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes spin{to{transform:rotate(360deg)}}:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}select.form-input{appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2394A3B8' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-position:right .75rem center;background-repeat:no-repeat;padding-right:2.5rem}.form-group{flex-direction:column;gap:.4rem;display:flex}.form-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em;font-size:.8rem;font-weight:600}.form-input{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);color:var(--text-primary);outline:none;min-height:44px;padding:.75rem 1rem;font-family:inherit;font-size:.9rem;transition:all .2s}.form-input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px #4f46e51f}.form-input::placeholder{color:var(--text-tertiary)}.form-textarea{resize:vertical;min-height:80px}.form-actions{justify-content:flex-end;gap:.75rem;margin-top:.5rem;display:flex}.form-hint{color:var(--text-tertiary);margin:.25rem 0 0;font-size:.75rem}.create-form{flex-direction:column;gap:1.25rem;display:flex}.dashboard-main{max-width:1200px;margin:0 auto;padding:1.25rem 1rem}@media (width>=768px){.dashboard-main{padding:2rem 1.5rem}}.dashboard-header{flex-direction:column;gap:1rem;margin-bottom:1.5rem;display:flex}@media (width>=640px){.dashboard-header{flex-direction:row;justify-content:space-between;align-items:flex-start}}.dashboard-title{color:var(--text-primary);margin:0;font-size:1.5rem;font-weight:800}@media (width>=768px){.dashboard-title{font-size:1.75rem}}.dashboard-subtitle{color:var(--text-secondary);margin:.25rem 0 0;font-size:.9rem}.dashboard-empty{text-align:center;background:var(--bg-secondary);border:2px dashed var(--border-color);border-radius:var(--radius-2xl);flex-direction:column;justify-content:center;align-items:center;padding:3rem 1.5rem;animation:.4s fadeIn;display:flex}.dashboard-empty__icon{margin-bottom:1rem;font-size:2.5rem}.dashboard-empty h2{color:var(--text-primary);margin:0 0 .5rem;font-size:1.2rem}.dashboard-empty p{color:var(--text-secondary);margin:0 0 1.5rem;font-size:.9rem}.breadcrumb{margin-bottom:1.25rem}.breadcrumb__link{color:var(--text-primary);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-xs);align-items:center;gap:.35rem;min-height:44px;padding:.5rem 1rem;font-size:.9rem;font-weight:600;text-decoration:none;transition:all .2s;display:inline-flex}.breadcrumb__link:hover{background:var(--bg-tertiary);border-color:var(--text-tertiary);box-shadow:var(--shadow-sm);color:var(--accent-primary)}.badge{border-radius:var(--radius-full);white-space:nowrap;padding:.2rem .6rem;font-size:.7rem;font-weight:600}.badge--draft{color:#64748b;background:#94a3b81f}.badge--active{color:#dc2626;background:#ef44441a;animation:2s ease-in-out infinite pulse}.badge--finished{color:#059669;background:#10b9811a}.toast-container{z-index:2000;flex-direction:column;gap:.5rem;display:flex;position:fixed;bottom:1rem;left:1rem;right:1rem}@media (width>=640px){.toast-container{max-width:380px;inset:1.5rem 1.5rem auto auto}}.toast{border-radius:var(--radius-lg);background:var(--bg-secondary);border:1px solid var(--border-color);box-shadow:var(--shadow-lg);color:var(--text-primary);align-items:center;gap:.75rem;padding:.875rem 1.1rem;animation:.25s slideUp;display:flex}.toast--success{border-left:4px solid var(--color-success)}.toast--error{border-left:4px solid var(--color-error)}.toast--warning{border-left:4px solid var(--color-warning)}.toast--info{border-left:4px solid var(--accent-primary)}.toast__icon{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;font-size:1.1rem;display:flex}.toast--success .toast__icon{color:var(--color-success)}.toast--error .toast__icon{color:var(--color-error)}.toast--warning .toast__icon{color:var(--color-warning)}.toast--info .toast__icon{color:var(--accent-primary)}.toast__message{flex:1;font-size:.85rem;line-height:1.4}.toast__close{color:var(--text-tertiary);cursor:pointer;border-radius:var(--radius-sm);background:0 0;border:none;justify-content:center;align-items:center;min-width:36px;min-height:36px;padding:.25rem;font-size:1.2rem;line-height:1;transition:all .2s;display:flex}.toast__close:hover{color:var(--text-primary);background:var(--bg-hover)}.spinner-fullscreen{background:var(--bg-primary);z-index:9999;flex-direction:column;justify-content:center;align-items:center;gap:1.5rem;display:flex;position:fixed;inset:0}.spinner-container{flex-direction:column;justify-content:center;align-items:center;gap:1rem;padding:2rem;display:flex}.spinner{position:relative}.spinner--sm{width:24px;height:24px}.spinner--md{width:48px;height:48px}.spinner--lg{width:72px;height:72px}.spinner__ring{border:3px solid #0000;border-radius:50%;position:absolute;inset:0}.spinner__ring:first-child{border-top-color:var(--accent-primary);animation:1s linear infinite spin}.spinner__ring:nth-child(2){border-right-color:var(--accent-secondary);animation:1.5s linear infinite reverse spin;inset:4px}.spinner__ring:nth-child(3){border-bottom-color:var(--accent-tertiary);animation:2s linear infinite spin;inset:8px}.spinner__text{color:var(--text-secondary);font-size:.9rem;animation:2s ease-in-out infinite pulse}.login-page{background:linear-gradient(135deg,#eef2ff 0%,#f0f9ff 50%,#ecfdf5 100%);justify-content:center;align-items:center;min-height:100vh;padding:1.5rem;display:flex;position:relative;overflow:hidden}.login-bg{z-index:0;pointer-events:none;position:fixed;inset:0}.login-bg__orb{filter:blur(80px);opacity:.35;border-radius:50%;position:absolute}.login-bg__orb--1{background:#818cf8;width:400px;height:400px;animation:10s ease-in-out infinite float;top:-100px;right:-80px}.login-bg__orb--2{background:#38bdf8;width:350px;height:350px;animation:12s ease-in-out infinite reverse float;bottom:-80px;left:-80px}.login-bg__orb--3{background:#34d399;width:250px;height:250px;animation:14s ease-in-out infinite float;top:50%;left:50%;transform:translate(-50%,-50%)}.login-bg__grid{display:none}@keyframes float{0%,to{transform:translate(0)scale(1)}33%{transform:translate(20px,-15px)scale(1.03)}66%{transform:translate(-15px,15px)scale(.97)}}.login-card{z-index:1;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-2xl);text-align:center;width:100%;max-width:420px;box-shadow:var(--shadow-xl);padding:2.5rem 2rem;animation:.5s slideUp;position:relative}@media (width>=640px){.login-card{padding:3rem}}.login-card__logo{margin-bottom:1.25rem;display:inline-flex}.login-card__title{color:var(--accent-primary);letter-spacing:.06em;margin:0 0 .25rem;font-size:2rem;font-weight:900}@media (width>=640px){.login-card__title{font-size:2.5rem}}.login-card__subtitle{color:var(--text-secondary);margin:0 0 .5rem;font-size:1rem;font-weight:500}.login-card__desc{color:var(--text-tertiary);margin:0 0 2rem;font-size:.85rem;line-height:1.5}.login-card__google-btn{background:var(--bg-secondary);width:100%;color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);cursor:pointer;min-height:52px;box-shadow:var(--shadow-sm);justify-content:center;align-items:center;gap:.75rem;padding:.875rem 1.5rem;font-family:inherit;font-size:.95rem;font-weight:600;transition:all .2s;display:flex}.login-card__google-btn:hover{box-shadow:var(--shadow-md);border-color:var(--text-tertiary);background:var(--bg-tertiary)}.login-card__google-btn:active{transform:scale(.99)}.login-card__features{border-top:1px solid var(--border-color);justify-content:center;gap:1.5rem;margin-top:2rem;padding-top:1.5rem;display:flex}.login-card__feature{color:var(--text-tertiary);flex-direction:column;align-items:center;gap:.35rem;font-size:.75rem;display:flex}.login-card__feature-icon{font-size:1.2rem}.select-role-page{background:linear-gradient(135deg,#eef2ff 0%,#f0f9ff 50%,#ecfdf5 100%);justify-content:center;align-items:center;min-height:100vh;padding:1.5rem;display:flex;position:relative;overflow:hidden}.select-role-bg{z-index:0;pointer-events:none;position:fixed;inset:0}.select-role-bg__orb{filter:blur(100px);opacity:.25;border-radius:50%;position:absolute}.select-role-bg__orb--1{background:#818cf8;width:500px;height:500px;animation:10s ease-in-out infinite float;top:-150px;left:-80px}.select-role-bg__orb--2{background:#38bdf8;width:400px;height:400px;animation:12s ease-in-out infinite reverse float;bottom:-100px;right:-80px}.select-role-container{z-index:1;width:100%;max-width:680px;animation:.5s slideUp;position:relative}.select-role-header{text-align:center;margin-bottom:2rem}.select-role-header h1{color:var(--accent-primary);margin:0 0 .4rem;font-size:1.5rem;font-weight:800}@media (width>=640px){.select-role-header h1{font-size:2rem}}.select-role-header p{color:var(--text-secondary);margin:0;font-size:1rem}.select-role-cards{flex-direction:column;gap:1rem;display:flex}@media (width>=640px){.select-role-cards{grid-template-columns:1fr 1fr;gap:1.25rem;display:grid}}.role-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-2xl);text-align:left;cursor:pointer;color:inherit;box-shadow:var(--shadow-sm);padding:1.75rem;font-family:inherit;transition:all .25s;position:relative;overflow:hidden}.role-card:before{content:"";height:4px;position:absolute;top:0;left:0;right:0}.role-card--teacher:before{background:var(--accent-primary)}.role-card--student:before{background:var(--accent-secondary)}.role-card:hover{box-shadow:var(--shadow-lg);border-color:var(--text-tertiary);transform:translateY(-3px)}.role-card:active{transform:translateY(-1px)}.role-card__icon{margin-bottom:.75rem;font-size:2.25rem}.role-card__title{color:var(--text-primary);margin:0 0 .4rem;font-size:1.2rem;font-weight:700}.role-card__desc{color:var(--text-secondary);margin:0 0 1rem;font-size:.85rem;line-height:1.5}.role-card__features{color:var(--text-tertiary);flex-direction:column;gap:.35rem;font-size:.78rem;display:flex}.role-card__arrow{color:var(--text-tertiary);font-size:1.4rem;transition:all .25s;position:absolute;bottom:1.25rem;right:1.25rem}.role-card:hover .role-card__arrow{color:var(--accent-primary);transform:translate(4px)}.select-role-note{text-align:center;color:var(--text-tertiary);margin-top:1.25rem;font-size:.8rem}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#0f172a66;justify-content:center;align-items:flex-end;padding:0;animation:.15s fadeIn;display:flex;position:fixed;inset:0}@media (width>=640px){.modal-overlay{align-items:center;padding:1rem}}.modal-content{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-2xl) var(--radius-2xl) 0 0;width:100%;max-height:90vh;box-shadow:var(--shadow-xl);animation:.25s slideUp;overflow-y:auto}@media (width>=640px){.modal-content{border-radius:var(--radius-2xl)}}.modal-content--sm{max-width:420px}.modal-content--md{max-width:600px}.modal-content--lg{max-width:800px}.modal-content--xl{max-width:1000px}.modal-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:1.25rem 1.5rem;display:flex}.modal-title{color:var(--text-primary);margin:0;font-size:1.1rem;font-weight:700}.modal-close{color:var(--text-tertiary);cursor:pointer;border-radius:var(--radius-md);background:0 0;border:none;justify-content:center;align-items:center;min-width:44px;min-height:44px;padding:.5rem;transition:all .2s;display:flex}.modal-close:hover{background:var(--bg-hover);color:var(--text-primary)}.modal-body{padding:1.5rem}.navbar{z-index:100;background:var(--bg-secondary);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-xs);position:sticky;top:0}.navbar__inner{justify-content:space-between;align-items:center;gap:1rem;max-width:1400px;height:56px;margin:0 auto;padding:0 1rem;display:flex}@media (width>=768px){.navbar__inner{gap:2rem;height:60px;padding:0 1.5rem}}.navbar__brand{flex-shrink:0;align-items:center;gap:.6rem;text-decoration:none;display:flex}.navbar__logo{align-items:center;display:flex}.navbar__title{color:var(--accent-primary);letter-spacing:.04em;font-size:1.15rem;font-weight:800}.navbar__nav{flex:1;align-items:center;gap:.25rem;display:none}@media (width>=768px){.navbar__nav{display:flex}}.navbar__link{border-radius:var(--radius-md);color:var(--text-secondary);padding:.5rem 1rem;font-size:.875rem;font-weight:500;text-decoration:none;transition:all .2s}.navbar__link:hover{color:var(--text-primary);background:var(--bg-hover)}.navbar__link--active{color:var(--accent-primary);background:var(--accent-light)}.navbar__user{flex-shrink:0;align-items:center;gap:.5rem;display:flex}@media (width>=768px){.navbar__user{gap:.75rem}}.navbar__role-badge{border-radius:var(--radius-full);background:var(--accent-light);color:var(--accent-primary);white-space:nowrap;border:1px solid #4f46e526;padding:.3rem .7rem;font-size:.72rem;font-weight:600;display:none}@media (width>=640px){.navbar__role-badge{display:block}}.navbar__avatar{border:2px solid var(--border-color);object-fit:cover;border-radius:50%;width:34px;height:34px}.navbar__user-info{flex-direction:column;display:none}@media (width>=768px){.navbar__user-info{display:flex}}.navbar__user-name{color:var(--text-primary);white-space:nowrap;font-size:.85rem;font-weight:600}.navbar__signout{color:var(--text-tertiary);cursor:pointer;border-radius:var(--radius-md);background:0 0;border:none;justify-content:center;align-items:center;min-width:44px;min-height:44px;padding:.5rem;transition:all .2s;display:flex}.navbar__signout:hover{color:var(--color-error);background:#ef444414}.teacher-dashboard{background:var(--bg-primary);min-height:100vh}.subjects-grid{grid-template-columns:1fr;gap:1rem;display:grid}@media (width>=640px){.subjects-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}}.subject-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);color:inherit;box-shadow:var(--shadow-xs);padding:1.25rem;text-decoration:none;transition:all .2s;position:relative;overflow:hidden}@media (width>=768px){.subject-card{padding:1.5rem}}.subject-card:before{content:"";background:var(--accent-primary);opacity:0;height:3px;transition:opacity .2s;position:absolute;top:0;left:0;right:0}.subject-card:hover{box-shadow:var(--shadow-md);border-color:#4f46e533}.subject-card:hover:before{opacity:1}.subject-card__header{justify-content:space-between;align-items:center;margin-bottom:.75rem;display:flex}.subject-card__icon{font-size:1.4rem}.subject-card__code{flex-direction:column;align-items:flex-end;gap:.1rem;display:flex}.subject-card__code-label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-tertiary);font-size:.62rem}.subject-card__code-value{color:var(--accent-primary);background:var(--accent-light);border-radius:var(--radius-md);padding:.15rem .5rem;font-family:JetBrains Mono,monospace;font-size:.82rem;font-weight:700}.subject-card__name{color:var(--text-primary);margin:0 0 .3rem;font-size:1.1rem;font-weight:700}.subject-card__desc{color:var(--text-secondary);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:0 0 .75rem;font-size:.8rem;line-height:1.4;display:-webkit-box;overflow:hidden}.subject-card__footer{border-top:1px solid var(--border-color);justify-content:space-between;align-items:center;padding-top:.75rem;display:flex}.subject-card__stat{color:var(--text-tertiary);font-size:.8rem}.subject-card__arrow{color:var(--text-tertiary);font-size:1.1rem;transition:all .2s}.subject-card:hover .subject-card__arrow{color:var(--accent-primary);transform:translate(3px)}.subject-detail-page{background:var(--bg-primary);min-height:100vh}.subject-header{margin-bottom:1.25rem}.subject-header__title{color:var(--text-primary);margin:0;font-size:1.4rem;font-weight:800}@media (width>=768px){.subject-header__title{font-size:1.75rem}}.subject-header__desc{color:var(--text-secondary);margin:.25rem 0 0;font-size:.9rem}.subject-header__stats{color:var(--text-tertiary);flex-wrap:wrap;gap:1rem;margin-top:.6rem;font-size:.82rem;display:flex}.subject-tabs{border-bottom:2px solid var(--border-color);gap:.25rem;margin-bottom:1rem;display:flex}.subject-tab{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;min-height:44px;margin-bottom:-2px;padding:.75rem 1.25rem;font-family:inherit;font-size:.88rem;font-weight:600;transition:all .2s}.subject-tab:hover{color:var(--text-primary)}.subject-tab--active{color:var(--accent-primary);border-bottom-color:var(--accent-primary)}.subject-section{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);overflow:hidden}.section-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;gap:.75rem;padding:1rem 1.25rem;display:flex}@media (width>=768px){.section-header{padding:1.25rem 1.5rem}}.section-title{color:var(--text-primary);margin:0;font-size:1rem;font-weight:700}.section-empty{text-align:center;color:var(--text-tertiary);padding:2rem 1.25rem;font-size:.88rem}.groups-list{flex-direction:column;display:flex}.group-card{border-bottom:1px solid var(--border-color)}.group-card:last-child{border-bottom:none}.group-card__header{background:var(--bg-tertiary);flex-direction:column;gap:.75rem;padding:1rem 1.25rem;display:flex}@media (width>=640px){.group-card__header{flex-direction:row;justify-content:space-between;align-items:center}}.group-card__info{flex-wrap:wrap;align-items:center;gap:.75rem;display:flex}.group-card__name{color:var(--text-primary);margin:0;font-size:1rem;font-weight:700}.group-card__count{color:var(--text-tertiary);font-size:.78rem}.group-card__code-area{align-items:center;gap:.5rem;display:flex}.group-card__code{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);cursor:pointer;align-items:center;gap:.5rem;padding:.4rem .75rem;transition:all .2s;display:flex}.group-card__code:hover{border-color:var(--accent-primary)}.group-card__code-label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-tertiary);font-size:.62rem}.group-card__code-value{color:var(--accent-primary);letter-spacing:.08em;font-family:JetBrains Mono,monospace;font-size:.88rem;font-weight:700}.group-card__code-copy{font-size:.8rem}.group-card__students,.exams-list{flex-direction:column;display:flex}.exam-item{border-bottom:1px solid var(--border-color);flex-direction:column;gap:.75rem;padding:1rem 1.25rem;transition:background .15s;display:flex}@media (width>=640px){.exam-item{flex-direction:row;justify-content:space-between;align-items:center;padding:1rem 1.5rem}}.exam-item:last-child{border-bottom:none}.exam-item:hover{background:var(--bg-hover)}.exam-item__info{flex:1;min-width:0}.exam-item__top{flex-wrap:wrap;align-items:center;gap:.6rem;margin-bottom:.3rem;display:flex}.exam-item__title{color:var(--text-primary);margin:0;font-size:.95rem;font-weight:600}.exam-item__meta{color:var(--text-tertiary);flex-wrap:wrap;gap:.75rem;font-size:.76rem;display:flex}.exam-item__actions{flex-wrap:wrap;flex-shrink:0;gap:.5rem;display:flex}.student-item{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;gap:.75rem;padding:.65rem 1.25rem;transition:background .15s;display:flex}.student-item:last-child{border-bottom:none}.student-item:hover{background:var(--bg-hover)}.student-item__info{flex-direction:column;gap:.05rem;min-width:0;display:flex}.student-item__name{color:var(--text-primary);font-size:.85rem;font-weight:600}.student-item__email{color:var(--text-tertiary);text-overflow:ellipsis;font-size:.72rem;overflow:hidden}.form-row{flex-direction:column;gap:1rem;display:flex}@media (width>=480px){.form-row{flex-direction:row}}.form-row .form-group{flex:1}.select-role-teacher-note{color:var(--text-secondary);margin-top:.4rem;font-size:.82rem}.image-upload{width:100%}.image-upload__dropzone{border:2px dashed var(--border-color);border-radius:var(--radius-lg);cursor:pointer;color:var(--text-tertiary);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:.5rem;padding:1.25rem;transition:all .2s;display:flex}.image-upload__dropzone:hover{border-color:var(--accent-primary);color:var(--accent-primary);background:var(--accent-light)}.image-upload__dropzone span{font-size:.85rem;font-weight:500}.image-upload__hint{color:var(--text-tertiary)!important;font-size:.7rem!important;font-weight:400!important}.image-upload__preview{border-radius:var(--radius-lg);border:1px solid var(--border-color);position:relative;overflow:hidden}.image-upload__preview img{object-fit:contain;background:var(--bg-tertiary);width:100%;max-height:200px;display:block}.image-upload__remove{color:#fff;cursor:pointer;background:#ef4444e6;border:none;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:.8rem;transition:all .2s;display:flex;position:absolute;top:.5rem;right:.5rem}.image-upload__remove:hover{background:var(--color-error);transform:scale(1.1)}.image-upload__progress{color:var(--text-secondary);align-items:center;gap:.75rem;margin-top:.5rem;font-size:.75rem;display:flex}.image-upload__progress-bar{background:var(--accent-primary);border-radius:var(--radius-full);flex:1;height:4px;transition:width .3s;position:relative}.image-upload__progress-bar:before{content:"";background:var(--border-color);border-radius:inherit;z-index:-1;width:100%;position:absolute;inset:0}.create-exam-page{background:var(--bg-primary);min-height:100vh}.exam-editor-header{flex-direction:column;gap:1rem;margin-bottom:1.5rem;display:flex}@media (width>=640px){.exam-editor-header{flex-direction:row;justify-content:space-between;align-items:flex-start;gap:1.5rem}}.exam-editor-meta{flex:1;min-width:0}.exam-title-input{border:none;border-bottom:2px solid var(--border-color);width:100%;color:var(--text-primary);background:0 0;outline:none;padding:.5rem 0;font-family:inherit;font-size:1.25rem;font-weight:800;transition:border-color .2s}@media (width>=768px){.exam-title-input{font-size:1.5rem}}.exam-title-input:focus{border-color:var(--accent-primary)}.exam-meta-row{flex-direction:column;gap:.75rem;margin-top:.75rem;display:flex}@media (width>=480px){.exam-meta-row{flex-flow:wrap;align-items:center;gap:1.25rem}}.exam-meta-item{color:var(--text-secondary);align-items:center;gap:.5rem;font-size:.85rem;display:flex}.exam-meta-item label{white-space:nowrap}.form-input--sm{width:auto;min-width:80px;min-height:38px;padding:.4rem .6rem;font-size:.85rem}.question-count{color:var(--accent-primary);background:var(--accent-light);border-radius:var(--radius-full);padding:.3rem .7rem;font-size:.82rem;font-weight:600}.questions-editor{flex-direction:column;gap:1rem;display:flex}.question-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);overflow:hidden}.question-card__header{background:var(--bg-tertiary);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:.875rem 1.25rem;display:flex}.question-card__number{color:var(--accent-primary);font-size:.88rem;font-weight:700}.question-card__controls{gap:.3rem;display:flex}.btn--icon{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);width:36px;height:36px;color:var(--text-secondary);cursor:pointer;justify-content:center;align-items:center;padding:0;font-family:inherit;font-size:.85rem;transition:all .2s;display:flex}.btn--icon:hover:not(:disabled){background:var(--bg-hover);color:var(--text-primary)}.btn--icon:disabled{opacity:.3;cursor:default}.btn--icon.btn--danger:hover:not(:disabled){color:var(--color-error);background:#ef444414;border-color:#ef444440}.question-card__body{flex-direction:column;gap:.875rem;padding:1.25rem;display:flex}.question-text-input{resize:vertical;min-height:60px;font-size:.95rem}.options-grid{flex-direction:column;gap:.6rem;display:flex}@media (width>=640px){.options-grid{grid-template-columns:1fr 1fr;gap:.65rem;display:grid}}.option-item{border:1px solid var(--border-color);border-radius:var(--radius-lg);cursor:pointer;align-items:center;gap:.7rem;min-height:48px;padding:.75rem 1rem;transition:all .2s;display:flex}.option-item:hover{background:#10b98108;border-color:#10b9814d}.option-item--correct{border-color:var(--color-success);background:#10b9810f}.option-radio{border:2px solid var(--border-color);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;font-size:.7rem;transition:all .2s;display:flex}.option-radio--selected{background:var(--color-success);border-color:var(--color-success)}.option-input{color:var(--text-primary);background:0 0;border:none;outline:none;flex:1;min-height:28px;font-family:inherit;font-size:.88rem}.option-input::placeholder{color:var(--text-tertiary)}.question-hint{color:var(--text-tertiary);text-align:center;margin:0;font-size:.72rem}.add-question-btn{background:var(--bg-secondary);border:2px dashed var(--border-color);border-radius:var(--radius-xl);color:var(--text-secondary);cursor:pointer;justify-content:center;align-items:center;gap:.5rem;min-height:56px;padding:1.15rem;font-family:inherit;font-size:.95rem;font-weight:600;transition:all .2s;display:flex}.add-question-btn:hover{border-color:var(--accent-primary);color:var(--accent-primary);background:var(--accent-light)}.add-question-btn span{font-size:1.3rem;font-weight:400}.option-remove-btn{flex-shrink:0;width:28px;height:28px;font-size:.7rem}.question-card__footer{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.5rem;display:flex}.stat-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);align-items:flex-start;gap:.875rem;padding:1.25rem;transition:all .2s;display:flex;position:relative;overflow:hidden}@media (width>=768px){.stat-card{gap:1rem;padding:1.5rem}}.stat-card:hover{box-shadow:var(--shadow-md)}.stat-card:before{content:"";height:3px;position:absolute;top:0;left:0;right:0}.stat-card--primary:before{background:var(--accent-primary)}.stat-card--success:before{background:var(--color-success)}.stat-card--warning:before{background:var(--color-warning)}.stat-card--error:before{background:var(--color-error)}.stat-card--info:before{background:var(--accent-secondary)}.stat-card__icon{border-radius:var(--radius-lg);flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;font-size:1.3rem;display:flex}.stat-card--primary .stat-card__icon{background:var(--accent-light);color:var(--accent-primary)}.stat-card--success .stat-card__icon{color:var(--color-success);background:#10b9811a}.stat-card--warning .stat-card__icon{color:var(--color-warning);background:#f59e0b1a}.stat-card--error .stat-card__icon{color:var(--color-error);background:#ef44441a}.stat-card--info .stat-card__icon{color:var(--accent-secondary);background:#0ea5e91a}.stat-card__content{flex-direction:column;gap:.1rem;min-width:0;display:flex}.stat-card__value{color:var(--text-primary);font-size:1.5rem;font-weight:800;line-height:1.2}@media (width>=768px){.stat-card__value{font-size:1.75rem}}.stat-card__label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em;font-size:.75rem;font-weight:500}.stat-card__subtitle{color:var(--text-tertiary);margin-top:.15rem;font-size:.72rem}.stat-card__trend{border-radius:var(--radius-md);padding:.2rem .45rem;font-size:.72rem;font-weight:600;position:absolute;top:.75rem;right:.75rem}.stat-card__trend--up{color:var(--color-success);background:#10b9811a}.stat-card__trend--down{color:var(--color-error);background:#ef44441a}.exam-control-page{background:var(--bg-primary);min-height:100vh}.exam-control-header{flex-direction:column;gap:1rem;margin-bottom:1.5rem;display:flex}@media (width>=768px){.exam-control-header{flex-direction:row;justify-content:space-between;align-items:flex-start;gap:2rem}}.exam-control-header__title{color:var(--text-primary);margin:0;font-size:1.3rem;font-weight:800}@media (width>=768px){.exam-control-header__title{font-size:1.5rem}}.exam-control-header__meta{color:var(--text-secondary);flex-wrap:wrap;align-items:center;gap:.75rem;margin-top:.4rem;font-size:.82rem;display:flex}.exam-control-header__actions{flex-direction:column;align-items:stretch;gap:.75rem;display:flex}@media (width>=480px){.exam-control-header__actions{flex-direction:row;align-items:center}}.exam-timer{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);text-align:center;min-width:150px;box-shadow:var(--shadow-xs);padding:.875rem 1.25rem}.exam-timer--warning{background:#ef44440a;border-color:#ef444459}.exam-timer__label{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.2rem;font-size:.68rem}.exam-timer__value{color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:1.5rem;font-weight:800}@media (width>=768px){.exam-timer__value{font-size:1.75rem}}.exam-timer--warning .exam-timer__value{color:var(--color-error)}.exam-timer__bar{background:var(--bg-tertiary);border-radius:var(--radius-full);height:3px;margin-top:.4rem;overflow:hidden}.exam-timer__bar-fill{background:var(--accent-primary);border-radius:inherit;height:100%;transition:width 1s linear}.exam-timer--warning .exam-timer__bar-fill{background:var(--color-error)}.stats-grid{grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:1.25rem;display:grid}@media (width>=768px){.stats-grid{grid-template-columns:repeat(4,1fr);gap:1rem;margin-bottom:1.5rem}}.charts-grid{flex-direction:column;gap:1rem;margin-bottom:1.25rem;display:flex}@media (width>=768px){.charts-grid{grid-template-columns:2fr 1fr;gap:1.25rem;margin-bottom:1.5rem;display:grid}}.chart-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);overflow:hidden}.chart-card__title{color:var(--text-primary);border-bottom:1px solid var(--border-color);margin:0;padding:1rem 1.25rem;font-size:.9rem;font-weight:700}.chart-card__body{height:250px;padding:1.25rem}@media (width>=768px){.chart-card__body{height:280px}}.chart-card__body--doughnut{justify-content:center;align-items:center;display:flex}.students-table-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);overflow:hidden}.students-table-card__title{color:var(--text-primary);border-bottom:1px solid var(--border-color);margin:0;padding:1rem 1.25rem;font-size:.9rem;font-weight:700}.students-table-wrapper{-webkit-overflow-scrolling:touch;overflow-x:auto}.students-table{border-collapse:collapse;width:100%;min-width:600px}.students-table th{text-align:left;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.04em;background:var(--bg-tertiary);white-space:nowrap;padding:.65rem .875rem;font-size:.72rem;font-weight:600}.students-table td{color:var(--text-secondary);border-bottom:1px solid var(--border-color);white-space:nowrap;padding:.65rem .875rem;font-size:.82rem}.students-table tbody tr:hover{background:var(--bg-hover)}.students-table tbody tr:last-child td{border-bottom:none}.td-rank{color:var(--text-tertiary);width:36px;font-weight:600}.td-name{color:var(--text-primary);font-weight:600}.td-correct{color:var(--color-success);font-weight:600}.td-incorrect{color:var(--color-error);font-weight:600}.td-empty{text-align:center;color:var(--text-tertiary);padding:2rem 1rem!important}.score-badge{border-radius:var(--radius-md);padding:.2rem .55rem;font-size:.78rem;font-weight:700;display:inline-block}.exam-reapply-section{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);flex-direction:column;align-items:flex-start;gap:.75rem;margin-top:1.5rem;padding:1.25rem;display:flex}@media (width>=640px){.exam-reapply-section{flex-direction:row;justify-content:space-between;align-items:center}}.exam-reapply-section p{color:var(--text-secondary);margin:0;font-size:.88rem}.btn--outline-primary{color:var(--accent-primary);border:1px solid var(--accent-primary);background:0 0}.btn--outline-primary:hover{background:var(--accent-light)}.student-dashboard{background:var(--bg-primary);min-height:100vh}.student-subjects{flex-direction:column;gap:1rem;display:flex}.student-subject-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);overflow:hidden}.student-subject-card__header{border-bottom:1px solid var(--border-color);background:var(--bg-tertiary);flex-direction:column;gap:.15rem;padding:1rem 1.25rem;display:flex}@media (width>=640px){.student-subject-card__header{flex-direction:row;justify-content:space-between;align-items:center;padding:1.15rem 1.5rem}}.student-subject-card__name{color:var(--text-primary);margin:0;font-size:1rem;font-weight:700}.student-subject-card__group{color:var(--accent-primary);margin-top:.15rem;font-size:.78rem;font-weight:600;display:block}.student-subject-card__teacher{color:var(--text-tertiary);font-size:.78rem}.student-exams-list{flex-direction:column;display:flex}.student-exams-empty{text-align:center;color:var(--text-tertiary);padding:1.5rem;font-size:.85rem}.student-exam-item{border-bottom:1px solid var(--border-color);flex-direction:column;gap:.75rem;padding:1rem 1.25rem;transition:background .15s;display:flex}@media (width>=640px){.student-exam-item{flex-direction:row;justify-content:space-between;align-items:center}}.student-exam-item:last-child{border-bottom:none}.student-exam-item:hover{background:var(--bg-hover)}.student-exam-item__info{flex:1;min-width:0}.student-exam-item__title{color:var(--text-primary);margin-bottom:.2rem;font-size:.92rem;font-weight:600;display:block}.student-exam-item__meta{color:var(--text-tertiary);gap:.75rem;font-size:.76rem;display:flex}.student-exam-item__right{flex-wrap:wrap;flex-shrink:0;align-items:center;gap:.6rem;display:flex}.student-score-badge{border-radius:var(--radius-md);text-align:center;min-width:44px;padding:.3rem .65rem;font-family:JetBrains Mono,monospace;font-size:.88rem;font-weight:800}.student-score-badge--pass{color:var(--color-success);background:#10b9811a;border:1px solid #10b98133}.student-score-badge--fail{color:var(--color-error);background:#ef444414;border:1px solid #ef444433}.exam-status{border-radius:var(--radius-full);white-space:nowrap;padding:.25rem .6rem;font-size:.72rem;font-weight:600}.exam-status--active{color:#dc2626;background:#ef444414;animation:2s ease-in-out infinite pulse}.exam-status--finished{color:#059669;background:#10b98114}.exam-status--draft{color:#64748b;background:#94a3b81a}.join-code-input{text-align:center;letter-spacing:.2em;font-family:JetBrains Mono,monospace;font-size:1.4rem;font-weight:700}.exam-lobby-page{background:var(--bg-primary);min-height:100vh}.lobby-container{justify-content:center;align-items:center;min-height:calc(100vh - 64px);padding:1.5rem;display:flex}.lobby-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-2xl);text-align:center;width:100%;max-width:460px;box-shadow:var(--shadow-lg);padding:2.5rem 1.5rem;animation:.5s slideUp}@media (width>=640px){.lobby-card{padding:3rem}}.lobby-pulse{justify-content:center;align-items:center;width:90px;height:90px;margin:0 auto 2rem;display:flex;position:relative}.lobby-pulse__ring{border:2px solid var(--accent-primary);opacity:0;border-radius:50%;animation:3s ease-out infinite pulseRing;position:absolute;inset:0}.lobby-pulse__ring:nth-child(2){animation-delay:1s}.lobby-pulse__ring:nth-child(3){animation-delay:2s}@keyframes pulseRing{0%{opacity:.6;transform:scale(.5)}to{opacity:0;transform:scale(1.5)}}.lobby-pulse__core{z-index:1;font-size:2.2rem}.lobby-card__title{color:var(--text-primary);margin:0 0 .5rem;font-size:1.35rem;font-weight:800}.lobby-card__subtitle{color:var(--text-secondary);margin:0 0 2rem;font-size:.88rem;line-height:1.5}.lobby-exam-info{background:var(--bg-tertiary);border-radius:var(--radius-xl);flex-direction:column;gap:.65rem;margin-bottom:1.75rem;padding:1.15rem;display:flex}.lobby-exam-info__item{justify-content:space-between;align-items:center;display:flex}.lobby-exam-info__label{color:var(--text-tertiary);font-size:.8rem}.lobby-exam-info__value{color:var(--text-primary);font-size:.88rem;font-weight:600}.lobby-tips{text-align:left;background:var(--accent-light);border-radius:var(--radius-lg);border:1px solid #4f46e51a;margin-bottom:1.75rem;padding:1rem 1.15rem}.lobby-tips h3{color:var(--text-primary);margin:0 0 .4rem;font-size:.82rem}.lobby-tips ul{color:var(--text-secondary);margin:0;padding-left:1.1rem;font-size:.78rem;line-height:1.6}.lobby-icon{margin-bottom:1rem;font-size:2.5rem}.take-exam-page{background:var(--bg-primary);min-height:100vh}.exam-topbar{z-index:100;background:var(--bg-secondary);border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-xs);justify-content:space-between;align-items:center;gap:.5rem;padding:.5rem 1rem;display:flex;position:relative}@media (width>=768px){.exam-topbar{gap:1rem;padding:.75rem 1.5rem}}.exam-topbar__left{flex:1;min-width:0}.exam-topbar__title{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;margin:0;font-size:.85rem;font-weight:700;overflow:hidden}@media (width>=768px){.exam-topbar__title{font-size:1rem}}.exam-topbar__timer{color:var(--text-primary);background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-lg);flex-shrink:0;align-items:center;gap:.35rem;padding:.4rem .75rem;font-family:JetBrains Mono,monospace;font-size:1rem;font-weight:800;display:flex}@media (width>=768px){.exam-topbar__timer{padding:.5rem 1rem;font-size:1.2rem}}.exam-topbar__timer--warning{color:var(--color-error);background:#ef44440f;border-color:#ef444459;animation:1s ease-in-out infinite pulse}.exam-topbar__right{flex-shrink:0;align-items:center;gap:.5rem;display:flex}@media (width>=768px){.exam-topbar__right{gap:1rem}}.exam-topbar__progress{color:var(--text-secondary);font-size:.8rem;font-weight:600;display:none}@media (width>=480px){.exam-topbar__progress{display:block}}.exam-timer-bar{background:var(--bg-tertiary);height:3px}.exam-timer-bar__fill{background:var(--accent-primary);height:100%;transition:width 1s linear}.exam-timer-bar__fill--warning{background:var(--color-error)}.exam-content{flex-direction:column;max-width:1200px;min-height:calc(100vh - 60px);margin:0 auto;display:flex}@media (width>=768px){.exam-content{grid-template-columns:200px 1fr;display:grid}}.question-nav{border-bottom:1px solid var(--border-color);background:var(--bg-secondary);padding:1rem}@media (width>=768px){.question-nav{border-right:1px solid var(--border-color);border-bottom:none;height:calc(100vh - 60px);padding:1.5rem;position:sticky;top:60px;overflow-y:auto}}.question-nav__title{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin:0 0 .75rem;font-size:.75rem;font-weight:700}.question-nav__grid{grid-template-columns:repeat(8,1fr);gap:.35rem;display:grid}@media (width>=768px){.question-nav__grid{grid-template-columns:repeat(4,1fr);gap:.4rem}}.question-nav__btn{aspect-ratio:1;border-radius:var(--radius-md);border:1px solid var(--border-color);background:var(--bg-primary);width:100%;color:var(--text-secondary);cursor:pointer;min-height:36px;font-family:inherit;font-size:.78rem;font-weight:600;transition:all .15s}.question-nav__btn:hover{border-color:var(--accent-primary);color:var(--accent-primary)}.question-nav__btn--current{border-color:var(--accent-primary);background:var(--accent-light);color:var(--accent-primary)}.question-nav__btn--answered{color:var(--color-success);background:#10b9811a;border-color:#10b9814d}.question-nav__legend{color:var(--text-tertiary);flex-direction:column;gap:.35rem;margin-top:1.25rem;font-size:.7rem;display:none}@media (width>=768px){.question-nav__legend{display:flex}}.question-nav__legend span{align-items:center;gap:.4rem;display:flex}.legend-dot{border-radius:3px;width:10px;height:10px;display:inline-block}.legend-dot--answered{background:#10b98159}.legend-dot--current{background:#4f46e559}.legend-dot--pending{background:var(--bg-primary);border:1px solid var(--border-color)}.question-content{padding:1.25rem 1rem 2rem}@media (width>=768px){.question-content{max-width:750px;padding:1.5rem 3rem 2rem}}.question-content__header{margin-bottom:1.25rem}.question-content__number{color:var(--accent-primary);background:var(--accent-light);border-radius:var(--radius-full);padding:.3rem .75rem;font-size:.78rem;font-weight:600}.question-content__text{color:var(--text-primary);margin:0 0 1.25rem;font-size:1.05rem;font-weight:600;line-height:1.5}@media (width>=768px){.question-content__text{font-size:1.2rem}}.question-content__image{border-radius:var(--radius-lg);border:1px solid var(--border-color);margin-bottom:1.25rem;overflow:hidden}.question-content__image img{object-fit:contain;background:var(--bg-tertiary);width:100%;max-height:250px;display:block}@media (width>=768px){.question-content__image img{max-height:300px}}.question-options{flex-direction:column;gap:.6rem;margin-bottom:1.25rem;display:flex}.question-option{background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:var(--radius-xl);cursor:pointer;color:var(--text-primary);text-align:left;width:100%;min-height:56px;box-shadow:var(--shadow-xs);align-items:center;gap:.875rem;padding:1rem 1.15rem;font-family:inherit;font-size:.9rem;transition:all .2s;display:flex}.question-option:hover:not(:disabled){border-color:var(--accent-primary);background:var(--accent-light)}.question-option:active:not(:disabled){transform:scale(.99)}.question-option--selected{box-shadow:0 0 0 3px #4f46e51a;border-color:var(--accent-primary)!important;background:var(--accent-light)!important}.question-option--disabled{opacity:.45;cursor:not-allowed}.question-option__letter{background:var(--bg-tertiary);width:34px;height:34px;color:var(--text-secondary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.82rem;font-weight:700;transition:all .2s;display:flex}.question-option--selected .question-option__letter{background:var(--accent-primary);color:#fff}.question-option__text{flex:1;line-height:1.4}.question-option__check{color:var(--accent-primary);flex-shrink:0;font-size:1.1rem;font-weight:700}.question-content__answered-notice{text-align:center;color:var(--color-success);margin:0 0 1.25rem;font-size:.82rem;font-weight:600}.question-content__nav{border-top:1px solid var(--border-color);justify-content:space-between;gap:1rem;padding-top:1rem;display:flex}.exam-submitted{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:2rem 1.5rem;display:flex}.exam-submitted__check{width:72px;height:72px;margin-bottom:1.5rem}.exam-submitted__check-svg{width:72px;height:72px}.exam-submitted__check-svg circle{stroke-dasharray:157;stroke-dashoffset:157px;stroke-width:2px;stroke:var(--color-success);animation:.6s ease-in-out forwards checkCircle}.exam-submitted__check-svg path{stroke-dasharray:48;stroke-dashoffset:48px;stroke-width:3px;stroke:var(--color-success);stroke-linecap:round;stroke-linejoin:round;animation:.3s ease-in-out .6s forwards checkMark}@keyframes checkCircle{to{stroke-dashoffset:0}}@keyframes checkMark{to{stroke-dashoffset:0}}.exam-submitted h1{color:var(--text-primary);margin:0 0 .5rem;font-size:1.5rem;font-weight:800}.exam-submitted p{color:var(--text-secondary);max-width:400px;margin:0 0 2rem;font-size:.9rem;line-height:1.5}.exam-submitted__stats-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);align-items:center;gap:1.5rem;margin-bottom:2rem;padding:1.25rem 2rem;display:flex}.exam-submitted__stat{flex-direction:column;align-items:center;gap:.15rem;display:flex}.exam-submitted__stat-value{color:var(--text-primary);font-size:2rem;font-weight:900}.exam-submitted__stat-label{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.04em;font-size:.72rem}.exam-submitted__stat-divider{background:var(--border-color);width:1px;height:40px}.exam-submitted__timer-section{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);width:100%;max-width:360px;box-shadow:var(--shadow-sm);padding:1.5rem 2rem}.exam-submitted__pulse{color:var(--color-success);justify-content:center;align-items:center;gap:.5rem;margin-bottom:.75rem;font-size:.78rem;font-weight:600;display:flex}.exam-submitted__pulse-dot{background:var(--color-success);border-radius:50%;width:8px;height:8px;animation:1.5s ease-in-out infinite pulse}.exam-submitted__countdown{justify-content:center;align-items:baseline;gap:.5rem;margin-bottom:.75rem;display:flex}.exam-submitted__countdown-icon{font-size:1.2rem}.exam-submitted__countdown-value{color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:2.25rem;font-weight:800}.exam-submitted__countdown-label{color:var(--text-tertiary);font-size:.82rem}.exam-submitted__timer-bar{background:var(--bg-tertiary);border-radius:var(--radius-full);height:4px;margin-bottom:.75rem;overflow:hidden}.exam-submitted__timer-bar-fill{background:var(--accent-primary);border-radius:inherit;height:100%;transition:width 1s linear}.exam-submitted__timer-bar-fill--warning{background:var(--color-error)}.exam-submitted__hint{color:var(--text-tertiary);margin:0;font-size:.75rem;line-height:1.4}.exam-results-page{background:var(--bg-primary);min-height:100vh}.results-container{justify-content:center;align-items:center;min-height:calc(100vh - 64px);padding:1.5rem;display:flex}.results-pending{text-align:center;animation:.4s slideUp}.results-pending__icon{margin-bottom:1rem;font-size:2.5rem}.results-pending h1{color:var(--text-primary);margin:0 0 .5rem;font-size:1.35rem}.results-pending p{color:var(--text-secondary);margin:0 0 1.5rem;font-size:.9rem}.results-header__title{color:var(--text-primary);margin:0 0 1.5rem;font-size:1.25rem;font-weight:800}@media (width>=768px){.results-header__title{margin-bottom:2rem;font-size:1.5rem}}.score-display{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-2xl);box-shadow:var(--shadow-sm);text-align:center;flex-direction:column;align-items:center;gap:1rem;margin-bottom:1.5rem;padding:2rem 1.5rem;animation:.4s slideUp;display:flex}@media (width>=640px){.score-display{text-align:left;flex-direction:row;gap:2rem}}.score-display__circle{border-radius:50%;flex-direction:column;flex-shrink:0;justify-content:center;align-items:center;width:110px;height:110px;display:flex}.score-display__circle--pass{border:3px solid var(--color-success);background:#10b98114}.score-display__circle--fail{border:3px solid var(--color-error);background:#ef44440f}.score-display__value{color:var(--text-primary);font-size:2.25rem;font-weight:900;line-height:1}.score-display__max{color:var(--text-tertiary);font-size:.85rem}.score-display__info{flex-direction:column;gap:.2rem;display:flex}.score-display__label{font-size:1.15rem;font-weight:700}.score-display__label--pass{color:var(--color-success)}.score-display__label--fail{color:var(--color-error)}.score-display__percentage{color:var(--text-secondary);font-size:.88rem}.results-stats{grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:1.5rem;display:grid}@media (width>=768px){.results-stats{grid-template-columns:repeat(4,1fr);gap:1rem}}.results-breakdown{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);overflow:hidden}.results-breakdown__title{color:var(--text-primary);border-bottom:1px solid var(--border-color);margin:0;padding:1rem 1.25rem;font-size:.95rem;font-weight:700}.results-breakdown__list{flex-direction:column;display:flex}.result-question{border-bottom:1px solid var(--border-color);border-left:4px solid #0000;padding:1rem 1.25rem}.result-question:last-child{border-bottom:none}.result-question--correct{border-left-color:var(--color-success)}.result-question--incorrect{border-left-color:var(--color-error)}.result-question--unanswered{border-left-color:var(--color-warning)}.result-question__header{justify-content:space-between;align-items:center;margin-bottom:.4rem;display:flex}.result-question__number{font-size:.78rem;font-weight:700}.result-question--correct .result-question__number{color:var(--color-success)}.result-question--incorrect .result-question__number{color:var(--color-error)}.result-question--unanswered .result-question__number{color:var(--color-warning)}.result-question__time{color:var(--text-tertiary);font-size:.72rem}.result-question__text{color:var(--text-primary);margin:0 0 .65rem;font-size:.9rem;line-height:1.4}.result-question__image{border-radius:var(--radius-lg);border:1px solid var(--border-color);margin-bottom:.65rem;overflow:hidden}.result-question__image img{object-fit:contain;background:var(--bg-tertiary);width:100%;max-height:180px}.result-question__answers{flex-direction:column;gap:.35rem;display:flex}.result-answer{border-radius:var(--radius-md);align-items:center;gap:.5rem;padding:.45rem .7rem;font-size:.82rem;display:flex}.result-answer__label{flex-shrink:0;font-weight:600}.result-answer--correct{color:var(--color-success);background:#10b98114}.result-answer--wrong{color:var(--color-error);background:#ef44440f}.result-answer--unanswered{color:var(--color-warning);background:#f59e0b14}.admin-sidebar{background:var(--bg-secondary);border-right:1px solid var(--border-color);width:100%;overflow-x:auto}@media (width>=768px){.admin-sidebar{width:240px;min-height:calc(100vh - 60px);position:sticky;top:60px;overflow:hidden auto}}.admin-sidebar__header{align-items:center;gap:.5rem;padding:1.5rem 1.25rem 1rem;display:none}@media (width>=768px){.admin-sidebar__header{display:flex}}.admin-sidebar__icon{font-size:1.2rem}.admin-sidebar__title{color:var(--accent-primary);letter-spacing:.02em;margin:0;font-size:.88rem;font-weight:800}.admin-sidebar__nav{gap:.15rem;padding:.5rem;display:flex;overflow-x:auto}@media (width>=768px){.admin-sidebar__nav{flex-direction:column;padding:.5rem .75rem 1rem;overflow-x:hidden}}.admin-sidebar__link{border-radius:var(--radius-lg);color:var(--text-secondary);white-space:nowrap;align-items:center;gap:.6rem;min-height:44px;padding:.6rem .85rem;font-size:.85rem;font-weight:500;text-decoration:none;transition:all .15s;display:flex}.admin-sidebar__link:hover{background:var(--bg-hover);color:var(--text-primary)}.admin-sidebar__link--active{background:var(--accent-light);color:var(--accent-primary);font-weight:600}.admin-sidebar__link-icon{font-size:1rem}.admin-layout{flex-direction:column;min-height:100vh;display:flex}.admin-layout__body{flex-direction:column;flex:1;display:flex}@media (width>=768px){.admin-layout__body{flex-direction:row}}.admin-layout__content{flex:1;max-width:1200px;padding:1.25rem 1rem}@media (width>=768px){.admin-layout__content{padding:2rem 1.5rem}}.admin-page-title{color:var(--text-primary);margin:0 0 1.5rem;font-size:1.4rem;font-weight:800}@media (width>=768px){.admin-page-title{font-size:1.6rem}}.admin-stats-grid{grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:1.5rem;display:grid}@media (width>=768px){.admin-stats-grid{grid-template-columns:repeat(4,1fr);gap:1rem}}.admin-table-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-xs);margin-bottom:1.25rem;overflow:hidden}.admin-table-card__header{border-bottom:1px solid var(--border-color);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;padding:1rem 1.25rem;display:flex}.admin-table-card__title{color:var(--text-primary);margin:0;font-size:.95rem;font-weight:700}.admin-table-wrapper{-webkit-overflow-scrolling:touch;overflow-x:auto}.admin-table{border-collapse:collapse;width:100%;min-width:500px}.admin-table th{text-align:left;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.04em;background:var(--bg-tertiary);white-space:nowrap;padding:.65rem .875rem;font-size:.72rem;font-weight:600}.admin-table td{color:var(--text-secondary);border-bottom:1px solid var(--border-color);padding:.65rem .875rem;font-size:.82rem}.admin-table tbody tr:hover{background:var(--bg-hover)}.admin-table tbody tr:last-child td{border-bottom:none}.admin-table__empty{text-align:center;color:var(--text-tertiary)!important;padding:2rem 1rem!important}.admin-add-form{flex-wrap:wrap;align-items:center;gap:.5rem;display:flex}.admin-add-form .form-input{flex:1;min-width:200px}.admin-filters{flex-wrap:wrap;gap:.75rem;margin-bottom:1rem;display:flex}.admin-filters .form-input{flex:1;min-width:0;max-width:300px}.admin-exam-expandable{border-bottom:1px solid var(--border-color)}.admin-exam-expandable:last-child{border-bottom:none}.admin-exam-row{cursor:pointer;justify-content:space-between;align-items:center;gap:.75rem;padding:.875rem 1.25rem;transition:background .15s;display:flex}.admin-exam-row:hover{background:var(--bg-hover)}.admin-exam-row__info{flex:1;min-width:0}.admin-exam-row__info strong{color:var(--text-primary);margin-bottom:.2rem;font-size:.9rem;display:block}.admin-exam-row__meta{color:var(--text-tertiary);flex-wrap:wrap;gap:.75rem;font-size:.72rem;display:flex}.admin-exam-row__right{flex-shrink:0;align-items:center;gap:.5rem;display:flex}.admin-exam-row__chevron{color:var(--text-tertiary);font-size:.7rem}.admin-exam-detail{border-top:1px solid var(--border-color);background:var(--bg-tertiary);flex-direction:column;gap:1rem;padding:0 1.25rem 1.25rem;display:flex}.admin-exam-detail__section{padding-top:1rem}.admin-exam-detail__section h4{color:var(--text-primary);text-transform:uppercase;letter-spacing:.03em;margin:0 0 .65rem;font-size:.82rem;font-weight:700}.admin-question-item{border-bottom:1px solid var(--border-color);gap:.5rem;padding:.65rem 0;display:flex}.admin-question-item:last-child{border-bottom:none}.admin-question-item__num{color:var(--accent-primary);flex-shrink:0;min-width:24px;font-size:.82rem;font-weight:700}.admin-question-item__content{flex:1;min-width:0}.admin-question-item__text{color:var(--text-primary);margin:0 0 .35rem;font-size:.85rem;line-height:1.4}.admin-question-item__img{border-radius:var(--radius-md);border:1px solid var(--border-color);object-fit:contain;max-width:160px;max-height:100px;margin-bottom:.35rem}.admin-question-item__options{flex-direction:column;gap:.15rem;display:flex}.admin-option{color:var(--text-secondary);border-radius:var(--radius-sm);padding:.15rem .4rem;font-size:.78rem}.admin-option--correct{color:var(--color-success);background:#10b9811a;font-weight:600}.admin-exam-detail__meta{color:var(--text-tertiary);border-top:1px solid var(--border-color);flex-wrap:wrap;gap:1rem;padding-top:.5rem;font-size:.72rem;display:flex}.score-badge{border-radius:var(--radius-md);padding:.2rem .5rem;font-family:JetBrains Mono,monospace;font-size:.82rem;font-weight:800}.score-badge--pass{color:var(--color-success);background:#10b9811a}.score-badge--fail{color:var(--color-error);background:#ef444414}