:root{--bg-primary:#0b0b12;--bg-secondary:#101018;--bg-card:#171722;--bg-card-hover:#1c1c29;--primary:#7c6aff;--primary-hover:#6d5df5;--text-primary:#f5f5f7;--text-secondary:#9292a3;--success:#35d07f;--warning:#f5b942;--error:#ef4444;--border-color:#252532;--font-primary:Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--shadow-card:0 4px 20px #0003;--sidebar-width:240px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background-color:var(--bg-primary);min-width:320px;min-height:100vh;color:var(--text-primary);font-family:var(--font-primary);-webkit-font-smoothing:antialiased;line-height:1.5}button,input,textarea,select{font:inherit}button{cursor:pointer;border:none}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}#root{min-height:100vh}.sidebar{width:var(--sidebar-width,240px);background:var(--bg-card);border-right:1px solid var(--border-color);z-index:50;flex-direction:column;height:100vh;padding:24px 16px;transition:transform .3s cubic-bezier(.4,0,.2,1);display:flex;position:fixed;top:0;left:0}.sidebar__backdrop{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:40;opacity:0;background:#0009;transition:opacity .3s;display:none;position:fixed;inset:0}.sidebar__logo{justify-content:space-between;align-items:center;margin-bottom:40px;padding:0 12px;display:flex}.sidebar__brand{align-items:center;gap:10px;display:flex}.sidebar__brand span{background:var(--primary);color:#fff;border-radius:var(--radius-sm);justify-content:center;align-items:center;width:32px;height:32px;font-size:16px;font-weight:600;display:flex}.sidebar__brand h1{color:var(--text-primary);font-size:18px;font-weight:600}.sidebar__close-btn{color:var(--text-secondary);border-radius:var(--radius-sm);background:0 0;justify-content:center;align-items:center;padding:6px;display:none}.sidebar__close-btn:hover{color:var(--text-primary);background:var(--bg-secondary)}.sidebar__nav{flex-direction:column;gap:6px;display:flex}.sidebar__link{color:var(--text-secondary);border-radius:var(--radius-sm);align-items:center;gap:10px;padding:11px 12px;font-size:13px;text-decoration:none;transition:background .2s,color .2s;display:flex}.sidebar__link:hover{background:var(--bg-secondary);color:var(--text-primary)}.sidebar__link--active{background:var(--bg-secondary);color:var(--primary)}.sidebar__icon{flex-shrink:0;width:18px;height:18px}.sidebar__bottom{margin-top:auto}.sidebar__profile{align-items:center;gap:10px;padding:12px;display:flex}.sidebar__avatar{background:var(--bg-secondary);width:32px;height:32px;color:var(--text-primary);border-radius:50%;justify-content:center;align-items:center;font-size:13px;font-weight:600;display:flex;overflow:hidden}.sidebar__avatar 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0;border-radius:50%;place-items:center;padding:0;display:grid}.header__notification:hover{background:var(--bg-secondary)}.header__profile{align-items:center;gap:10px;display:flex}.header__avatar{background:var(--primary);width:40px;height:40px;color:var(--text-primary);border-radius:50%;place-items:center;font-weight:600;display:grid;overflow:hidden}.header__avatar img{object-fit:cover;width:100%;height:100%}.header__user{flex-direction:column;display:flex}.header__user span{color:var(--text-primary);font-size:14px;font-weight:500}.header__user small{color:var(--text-secondary);font-size:12px}@media (width<=768px){.header{width:100%;padding:16px 20px}.header__menu-btn{display:flex}.header__greeting h1{font-size:18px}.header__greeting p,.header__user{display:none}}.dashboard{padding:32px}.dashboard__welcome{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);justify-content:space-between;align-items:center;padding:28px 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(width<=600px){.dashboard{padding:20px 16px}.dashboard__stat{grid-template-columns:1fr}.dashboard__welcome{padding:24px}.dashboard__welcome h1{font-size:20px}}.stat-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:20px}.stat-card__title{color:var(--text-secondary);font-size:13px}.stat-card__value{color:var(--text-primary);margin-top:8px;font-size:28px;font-weight:600}.stat-card__description{color:var(--text-secondary);margin-top:4px;font-size:12px;display:block}.continue-learning{margin-top:32px}.continue-learning__header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.continue-learning__header h2{color:var(--text-primary);font-size:18px;font-weight:600}.continue-learning__header p{color:var(--text-secondary);margin-top:4px;font-size:13px}.continue-learning__header button{color:var(--primary);cursor:pointer;background:0 0;border:none;font-size:13px}.continue-learning__card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);grid-template-columns:1.5fr 1fr auto;align-items:center;gap:32px;padding:24px;display:grid}.continue-learning__label{background:var(--primary);color:#fff;border-radius:6px;margin-bottom:10px;padding:4px 8px;font-size:11px;font-weight:500;display:inline-block}.continue-learning__info h3{color:var(--text-primary);font-size:16px;font-weight:600}.continue-learning__info p{color:var(--text-secondary);margin-top:6px;font-size:13px}.progress-info{color:var(--text-secondary);justify-content:space-between;margin-bottom:8px;font-size:12px;display:flex}.progress-bar{background:var(--border-color);border-radius:10px;width:100%;height:7px;overflow:hidden}.progress-bar__fill{background:var(--primary);border-radius:inherit;width:65%;height:100%}.continue-learning__button{background:var(--primary);color:#fff;border-radius:var(--radius-sm);cursor:pointer;border:none;padding:10px 18px;font-size:13px;font-weight:500}.continue-learning__button:hover{background:var(--primary-hover)}.continue-learning__view-all{color:var(--primary);cursor:pointer;background:0 0;border:none;font-size:13px;text-decoration:none}.continue-learning__view-all:hover{text-decoration:underline}@media (width<=900px){.continue-learning__card{grid-template-columns:1fr;gap:20px}.continue-learning__button{width:fit-content}}@media 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p{color:var(--text-secondary);margin-top:5px;font-size:12px}.recent-quiz__score{flex-direction:column;align-items:flex-end;display:flex}.recent-quiz__score span{color:var(--primary);font-size:16px;font-weight:600}.recent-quiz__score small{color:var(--text-secondary);margin-top:3px;font-size:11px}@media (width<=600px){.recent-quizzes{margin-top:24px}.recent-quiz{padding:16px}}.upload-material{padding:32px}.upload-material__header h1{color:var(--text-primary);font-size:24px;font-weight:600}.upload-material__header p{color:var(--text-secondary);margin-top:8px;font-size:14px}.upload-material__box{text-align:center;background-color:var(--bg-card);border:1px dashed var(--border-color);border-radius:var(--radius-lg);flex-direction:column;align-items:center;margin-top:32px;padding:60px 32px;transition:border-color .2s,background-color .2s,transform 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input{display:none}.upload-material__formats{color:var(--text-secondary);margin-top:14px;font-size:12px}.upload-material__error{color:#dc2626;margin-top:16px;font-size:13px}.upload-material__slider-section{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);margin-top:24px;padding:22px 24px}.upload-material__slider-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px;padding-bottom:14px;display:flex}.upload-material__slider-title-wrap{flex-wrap:wrap;align-items:baseline;gap:12px;display:flex}.upload-material__slider-title-wrap h3{color:var(--text-primary);margin:0;font-size:16px;font-weight:600}.upload-material__slider-subtitle{color:var(--text-secondary);font-size:13px}.upload-material__slider-actions{align-items:center;gap:12px;display:flex}.upload-material__select-all-btn{border:1px solid var(--border-color);color:var(--primary);border-radius:var(--radius-sm);cursor:pointer;white-space:nowrap;background:0 0;padding:6px 12px;font-size:12px;font-weight:500;transition:all .2s}.upload-material__select-all-btn:hover{background:var(--bg-secondary);border-color:var(--primary)}.upload-material__slider-nav{align-items:center;gap:6px;display:flex}.upload-material__nav-btn{border-radius:var(--radius-sm);background:var(--bg-secondary);border:1px solid var(--border-color);width:32px;height:32px;color:var(--text-primary);cursor:pointer;place-items:center;transition:all .2s;display:grid}.upload-material__nav-btn:hover:not(:disabled){background:var(--bg-card-hover);border-color:var(--primary);color:var(--primary)}.upload-material__nav-btn:disabled{opacity:.35;cursor:not-allowed}.upload-material__slider-viewport{width:100%;position:relative}.upload-material__slider-fade{pointer-events:none;z-index:2;width:36px;transition:opacity .2s;position:absolute;top:0;bottom:12px}.upload-material__slider-fade--left{background:linear-gradient(90deg, var(--bg-card) 0%, transparent 100%);left:0}.upload-material__slider-fade--right{background:linear-gradient(270deg, var(--bg-card) 0%, transparent 100%);right:0}.upload-material__slider-track{scroll-snap-type:x mandatory;scroll-behavior:smooth;-webkit-overflow-scrolling:touch;scrollbar-width:thin;scrollbar-color:var(--border-color) transparent;gap:14px;padding:4px 2px 12px;display:flex;overflow-x:auto}.upload-material__slider-track::-webkit-scrollbar{height:6px}.upload-material__slider-track::-webkit-scrollbar-track{background:#ffffff08;border-radius:4px}.upload-material__slider-track::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}.upload-material__slider-track::-webkit-scrollbar-thumb:hover{background:#7c6aff66}.material-card{border-radius:var(--radius-md);background:var(--bg-secondary);border:1.5px solid var(--border-color);cursor:pointer;scroll-snap-align:start;-webkit-user-select:none;user-select:none;text-align:left;outline:none;flex-direction:column;flex:0 0 230px;justify-content:space-between;width:230px;min-width:230px;height:184px;padding:16px;transition:transform .2s,border-color .2s,box-shadow .2s,background-color .2s;display:flex;position:relative;overflow:hidden}.material-card:hover{background-color:var(--bg-card-hover);box-shadow:none;border-color:#7c6aff80;transform:translateY(-2px)}.material-card:focus-visible{border-color:var(--primary);outline:2px solid var(--primary);outline-offset:1px;box-shadow:none!important}.material-card--selected{border-color:var(--primary)!important;background:linear-gradient(180deg, #7c6aff1a 0%, var(--bg-secondary) 100%)!important;box-shadow:none!important}.material-card--uploading{cursor:default}.material-card--error{border-color:#ef444480!important}.material-card__top{justify-content:space-between;align-items:flex-start;gap:10px;width:100%;display:flex}.material-card__actions{align-items:center;gap:6px;display:flex}.material-card__check{border:1.5px solid var(--border-color);background:var(--bg-card);color:#fff;border-radius:50%;place-items:center;width:22px;height:22px;transition:all .2s;display:grid}.material-card:hover .material-card__check:not(.material-card__check--selected){border-color:#7c6aff99}.material-card__check--selected{background:var(--primary);border-color:var(--primary)}.material-card__delete-btn{width:22px;height:22px;color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:50%;place-items:center;padding:0;transition:all .2s;display:grid}.material-card__delete-btn:hover{color:#ef4444;background:#ef444426}.material-card__body{flex-direction:column;gap:6px;width:100%;min-width:0;display:flex}.material-card__name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;max-width:100%;font-size:14px;font-weight:600;line-height:1.3;display:block;overflow:hidden}.material-card__meta{color:var(--text-secondary);min-width:0;font-size:12px}.material-card__ready-meta{justify-content:space-between;align-items:center;gap:8px;display:flex}.material-card__size{color:var(--text-secondary);font-size:12px}.material-card__status-ready{color:#35d07f;background:#35d07f1a;border-radius:999px;align-items:center;padding:2px 7px;font-size:11px;font-weight:500;display:inline-flex}.material-card__uploading-meta{flex-direction:column;gap:6px;width:100%;display:flex}.material-card__progress-bar{background:var(--bg-card);border-radius:4px;width:100%;height:4px;overflow:hidden}.material-card__progress-fill{background:var(--primary);border-radius:4px;height:100%;transition:width .2s}.material-card__status-text{color:var(--primary);font-size:11px;font-weight:500}.material-card__status-error{color:#ef4444;white-space:nowrap;text-overflow:ellipsis;font-size:11px;display:block;overflow:hidden}.material-card__footer{border-top:1px solid var(--border-color);justify-content:space-between;align-items:center;padding-top:8px;display:flex}.material-card__select-label{color:var(--text-secondary);font-size:11.5px;font-weight:500;transition:color .2s}.material-card__select-label--active{color:var(--primary);font-weight:600}.file-type-logo{letter-spacing:.05em;border:1px solid #0000;border-radius:6px;align-items:center;gap:6px;padding:4px 8px 4px 6px;font-size:11px;font-weight:700;line-height:1;display:inline-flex}.file-type-logo__icon-box{justify-content:center;align-items:center;display:flex}.file-type-logo__badge{letter-spacing:.04em;font-size:10.5px;font-weight:700}.file-type-logo--pdf{color:#f87171;background:#ef44441f;border-color:#ef444447}.file-type-logo--doc{color:#60a5fa;background:#3b82f61f;border-color:#3b82f647}.file-type-logo--txt{color:#94a3b8;background:#94a3b81f;border-color:#94a3b847}.file-type-logo--image{color:#c084fc;background:#a855f71f;border-color:#a855f747}.file-type-logo--sheet{color:#34d399;background:#10b9811f;border-color:#10b98147}.file-type-logo--ppt{color:#fb923c;background:#f973161f;border-color:#f9731647}.file-type-logo--default{color:var(--primary);background:#7c6aff1f;border-color:#7c6aff47}.upload-material__config-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);margin-top:24px;overflow:hidden}.upload-material__config-header{border-bottom:1px solid var(--border-color);background:linear-gradient(#7c6aff0d 0%,#0000 100%);justify-content:space-between;align-items:center;gap:16px;padding:20px 24px;display:flex}.upload-material__config-title-wrap{align-items:center;gap:14px;display:flex}.upload-material__config-icon{width:40px;height:40px;color:var(--primary);background:#7c6aff1f;border-radius:10px;flex-shrink:0;place-items:center;display:grid}.upload-material__config-header h3{color:var(--text-primary);font-size:16px;font-weight:600}.upload-material__config-header p{color:var(--text-secondary);margin-top:2px;font-size:13px}.upload-material__selection-badge{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-secondary);border-radius:999px;flex-shrink:0;align-items:center;gap:6px;padding:6px 12px;font-size:12px;display:inline-flex}.upload-material__badge-count{color:var(--primary);font-weight:600}.upload-material__config-body{flex-direction:column;gap:20px;padding:24px;display:flex}.upload-material__config-field{flex-direction:column;gap:10px;display:flex}.upload-material__field-header{justify-content:space-between;align-items:center;gap:12px;display:flex}.upload-material__field-label{color:var(--text-primary);font-size:14px;font-weight:600}.upload-material__field-hint{color:var(--text-secondary);font-size:12px}.upload-material__presets-row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.upload-material__preset-chip{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;padding:9px 18px;font-size:13px;font-weight:500;transition:all .2s}.upload-material__preset-chip:hover{background:var(--bg-card-hover);color:var(--text-primary);border-color:#7c6aff66}.upload-material__preset-chip--active{background:var(--primary);border-color:var(--primary);color:#fff}.upload-material__preset-chip--active:hover{background:var(--primary-hover);border-color:var(--primary-hover);color:#fff}.upload-material__custom-input-wrap{align-items:center;display:flex;position:relative}.upload-material__number-input{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);width:90px;color:var(--text-primary);outline:none;padding:8px 12px;font-size:13px;font-weight:500;transition:border-color .2s}.upload-material__number-input:focus{border-color:var(--primary)}.upload-material__difficulty-row{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.upload-material__diff-chip{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);cursor:pointer;text-align:left;flex-direction:column;align-items:flex-start;padding:14px 16px;transition:all .2s;display:flex}.upload-material__diff-chip:hover{background:var(--bg-card-hover);border-color:#7c6aff66}.upload-material__diff-chip--active{border-color:var(--primary);background:#7c6aff1f}.upload-material__diff-label{color:var(--text-primary);font-size:14px;font-weight:600}.upload-material__diff-chip--active .upload-material__diff-label{color:var(--primary)}.upload-material__diff-desc{color:var(--text-secondary);margin-top:4px;font-size:12px;line-height:1.3}.upload-material__config-footer{background:var(--bg-secondary);border-top:1px solid var(--border-color);justify-content:space-between;align-items:center;gap:20px;padding:18px 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label{color:var(--text-secondary,#9292a3);font-size:13px;font-weight:500}.reset-input-wrap{align-items:center;display:flex;position:relative}.reset-input-icon{color:var(--text-secondary,#9292a3);pointer-events:none;transition:color .2s;position:absolute;left:14px}.reset-input{background:var(--bg-secondary,#101018);border:1px solid var(--border-color,#252532);width:100%;height:46px;color:var(--text-primary,#f5f5f7);box-sizing:border-box;border-radius:10px;padding:0 42px;font-family:inherit;font-size:14px;transition:all .2s}.reset-input::placeholder{color:#556}.reset-input:focus{border-color:var(--primary,#7c6aff);background:#12121d;outline:none;box-shadow:0 0 0 3px #7c6aff26}.reset-input-wrap:focus-within .reset-input-icon{color:var(--primary,#7c6aff)}.reset-toggle-btn{color:var(--text-secondary,#9292a3);cursor:pointer;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;padding:4px;display:flex;position:absolute;right:12px}.reset-toggle-btn:hover{color:var(--text-primary,#f5f5f7)}.reset-match-icon{color:#35d07f;align-items:center;display:flex;position:absolute;right:14px}.reset-submit-btn{background:var(--primary,#7c6aff);color:#fff;cursor:pointer;border:none;border-radius:10px;justify-content:center;align-items:center;gap:8px;width:100%;height:46px;margin-top:6px;font-size:14px;font-weight:600;transition:all .2s;display:flex;box-shadow:0 4px 18px #7c6aff59}.reset-submit-btn:hover:not(:disabled){background:var(--primary-hover,#6d5df5);transform:translateY(-1px);box-shadow:0 6px 24px #7c6aff73}.reset-submit-btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.reset-footer{text-align:center;margin-top:20px;font-size:13.5px}.reset-back-link{color:var(--text-secondary,#9292a3);align-items:center;gap:6px;text-decoration:none;transition:color .2s;display:inline-flex}.reset-back-link:hover{color:var(--text-primary,#f5f5f7)}.reset-success-box{text-align:center;background:#35d07f1a;border:1px solid #35d07f4d;border-radius:12px;margin-bottom:20px;padding:16px}.reset-success-box p{color:#35d07f;font-size:13.5px;line-height:1.5}@media (width<=480px){.reset-card{border-radius:16px;padding:28px 20px}}.server-warmup-banner{z-index:9999;border-radius:var(--radius-md,10px);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);align-items:center;gap:10px;padding:12px 18px;font-size:13.5px;font-weight:500;transition:all .3s cubic-bezier(.16,1,.3,1);animation:.3s ease-out slideUp;display:flex;position:fixed;bottom:20px;right:20px;box-shadow:0 8px 24px #0006}.server-warmup-banner--warming{color:#e0e7ff;background:#1e1b4beb;border:1px solid #818cf866}.server-warmup-banner--ready{color:#ecfdf5;background:#064e3beb;border:1px solid #34d39966}.server-warmup-icon.pulse{color:#818cf8;animation:1.5s infinite alternate pulseIcon}.server-warmup-icon.success{color:#34d17c}.server-warmup-spinner{color:#a5b4fc;animation:1s linear infinite spin}@keyframes slideUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes pulseIcon{0%{opacity:.8;transform:scale(1)}to{opacity:1;transform:scale(1.15)}}@media (width<=640px){.server-warmup-banner{font-size:12.5px;bottom:12px;left:12px;right:12px}}.app{min-height:100vh}.main-area{margin-left:var(--sidebar-width);min-height:100vh;transition:margin-left .3s}.main-content{padding-top:90px}@media (width<=768px){.main-area{margin-left:0}.main-content{padding-top:75px}}