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.15s;display:flex}.data-row:hover{border-color:var(--border-accent);background:var(--surface-2)}.data-row__main{flex:1;min-width:0}.data-row__title{color:var(--text-primary);margin-bottom:2px;font-size:14px;font-weight:600}.data-row__sub{color:var(--text-muted);font-size:13px}.data-row__action{flex-shrink:0}.data-row__rank{color:var(--text-muted);flex-shrink:0;width:36px;font-size:1rem;font-weight:700}.data-row__avatar{background:var(--surface-3);border:1px solid var(--border-subtle);border-radius:50%;flex-shrink:0;width:36px;height:36px;overflow:hidden}.data-row__avatar img{object-fit:cover;width:100%;height:100%}.item-card__actions{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.text-center{text-align:center}.mt-sm{margin-top:8px}.mt-md{margin-top:16px}.badge{text-transform:capitalize;border-radius:999px;align-items:center;padding:3px 10px;font-size:11px;font-weight:600;display:inline-flex}.badge--easy,.badge--success,.mcq-badge--easy{background:var(--success-bg);color:var(--success)}.badge--medium,.badge--warning,.mcq-badge--medium{background:var(--warning-bg);color:var(--warning)}.badge--hard,.badge--danger,.mcq-badge--hard{background:var(--danger-bg);color:var(--danger)}.badge--neutral{background:var(--surface-3);color:var(--text-muted)}.badge--dark{background:var(--primary);color:#fff}.btn-primary,.btn-accent{background:var(--primary);color:#fff;font-family:var(--font-ui,inherit);letter-spacing:-.01em;border:none;border-radius:6px;justify-content:center;align-items:center;gap:6px;padding:9px 16px;font-size:13px;font-weight:600;transition:background .15s,filter .15s;display:inline-flex}.btn-primary:hover,.btn-accent:hover{background:var(--primary-light);filter:none;box-shadow:none;transform:none}.btn-primary:disabled,.btn-accent:disabled{opacity:.45;cursor:not-allowed}.btn-ghost{background:var(--surface-2);border:1px solid var(--border-medium);color:var(--text-primary);font-family:var(--font-ui,inherit);letter-spacing:-.01em;border-radius:6px;align-items:center;gap:6px;padding:8px 14px;font-size:13px;font-weight:600;transition:background .15s,border-color .15s;display:inline-flex}.btn-ghost:hover{background:var(--surface-hover);border-color:var(--border-medium);color:var(--text-primary)}.btn-ghost:disabled{opacity:.4;cursor:not-allowed}.btn-danger{background:var(--surface-1);border:1px solid var(--danger);color:var(--danger)}.btn-danger:hover{background:var(--danger-bg)}.dash-layout .view-btn{color:var(--primary-light);background:var(--primary-soft);border:1px solid var(--primary-muted);border-radius:4px;padding:6px 12px;font-size:13px;font-weight:600}.dash-layout .view-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.tab-bar{flex-wrap:wrap;gap:6px;margin-bottom:1.25rem;display:flex}.tab{color:var(--text-muted);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:8px;padding:8px 14px;font-size:13px;font-weight:600;transition:all .15s}.tab:hover{background:var(--surface-3);color:var(--text-primary)}.tab--active{background:var(--primary);color:#fff;box-shadow:none;border-color:#0000}.empty-state{text-align:center;background:var(--surface-1);border:1px dashed var(--border-medium);border-radius:10px;padding:3rem 1.5rem}.empty-state svg{color:var(--text-soft);margin:0 auto 12px}.empty-state h3{letter-spacing:-.02em;margin-bottom:6px;font-size:1rem;font-weight:600}.empty-state p{font-size:var(--text-base);color:var(--text-muted);line-height:var(--leading-relaxed);max-width:400px;margin:0 auto}.loading-state{color:var(--text-muted);align-items:center;gap:10px;padding:2rem 0;font-size:14px;display:flex}.loading-state__spinner{border:2px solid var(--primary-muted);border-top-color:var(--primary);border-radius:50%;width:18px;height:18px;animation:.7s linear infinite spin}.skeleton{background:linear-gradient(90deg,var(--surface-2)0%,var(--surface-3)45%,var(--surface-2)90%);background-size:200% 100%;border-radius:6px;animation:1.15s ease-in-out infinite skeletonShimmer;display:block}@keyframes skeletonShimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-meta{width:180px;height:14px;margin-bottom:12px}.skeleton-card{border:1px solid var(--border-subtle);background:var(--surface-1);border-radius:10px;padding:1rem}.skeleton-card__title{width:72%;height:16px;margin-bottom:12px}.skeleton-card__line{width:100%;height:12px;margin-bottom:8px}.skeleton-card__line--short{width:55%;margin-bottom:0}.skeleton-stat__label{width:60%;height:10px;margin-bottom:10px}.skeleton-stat__value{width:45%;height:22px}.skeleton-row__title{width:48%;height:14px;margin-bottom:8px}.skeleton-row__sub{width:70%;height:12px}.skeleton-row__badge{border-radius:999px;flex-shrink:0;width:48px;height:24px}.skeleton-mcq-card{pointer-events:none}.skeleton-mcq-card__head{justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.skeleton-mcq-card__num{width:36px;height:14px}.skeleton-mcq-card__badge{border-radius:999px;width:56px;height:22px}.skeleton-mcq-card__question{width:92%;height:16px;margin-bottom:16px}.skeleton-mcq-card__options{flex-direction:column;gap:8px;display:flex}.skeleton-mcq-card__option{border-radius:8px;width:100%;height:42px}.skeleton-video{aspect-ratio:16/9;background:linear-gradient(90deg,var(--surface-2)0%,var(--surface-3)45%,var(--surface-2)90%);background-size:200% 100%;border-radius:10px;width:100%;animation:1.15s ease-in-out infinite skeletonShimmer}.skeleton-vs-card{border:1px solid var(--border-subtle);background:var(--surface-1);pointer-events:none;border-radius:10px;padding:14px}.skeleton-vs-card__head{justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;display:flex}.skeleton-vs-card__title{flex:1;height:14px}.skeleton-vs-card__badge{border-radius:999px;flex-shrink:0;width:72px;height:22px}.skeleton-vs-card__line{width:100%;height:11px;margin-bottom:8px}.skeleton-vs-card__line--short{width:65%;margin-bottom:0}.text-error{color:var(--danger);font-size:14px}.text-muted{color:var(--text-muted);font-size:14px}.pagination-bar,.mcq-pagination{flex-wrap:wrap;align-items:center;gap:10px;margin-top:1.25rem;display:flex}.pagination-bar__info,.mcq-pagination__info{color:var(--text-muted);font-size:14px}.modal-overlay{--surface-0:#181818;--surface-1:#1c1c1c;--surface-2:#202020;--surface-3:#262626;--surface-hover:#2a2a2a;--surface-inverse:#007acc;--border-subtle:#242424;--border-medium:#2c2c2c;--border-strong:#363636;--text-primary:#d4d4d4;--text-secondary:#c8c8c8;--text-muted:#8a8a8a;--primary:#007acc;--primary-light:#1a8ad4;--success:#4ec9b0;--danger:#f14c4c;--danger-bg:#f14c4c1a;--text-md:15px;--leading-relaxed:1.72;--font-ui:"Inter","Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,sans-serif;z-index:var(--z-dialog);padding:max(16px,env(safe-area-inset-top))max(16px,env(safe-area-inset-right))max(16px,env(safe-area-inset-bottom))max(16px,env(safe-area-inset-left));-webkit-backdrop-filter:blur(6px);background:#000000bf;justify-content:center;align-items:center;animation:.2s modalOverlayIn;display:flex;position:fixed;inset:0}@keyframes modalOverlayIn{0%{opacity:0}to{opacity:1}}@keyframes modalIn{0%{opacity:0;transform:translateY(10px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.modal{background:#1c1c1c;background:var(--surface-1);border:1px solid var(--border-medium);border-radius:14px;flex-direction:column;width:100%;max-width:480px;max-height:min(90vh,900px);animation:.22s modalIn;display:flex;overflow:hidden;box-shadow:0 24px 48px #00000073}.modal--lg{max-width:640px}.modal--xl{max-width:760px}.modal__head{border-bottom:1px solid var(--border-subtle);flex-shrink:0;justify-content:space-between;align-items:flex-start;gap:12px;padding:1.15rem 1.25rem;display:flex}.modal__head-text{flex:1;min-width:0}.modal__head h2{color:var(--text-primary);letter-spacing:-.02em;margin:0;font-size:1.0625rem;font-weight:600;line-height:1.35}.modal__subtitle{color:var(--text-muted);margin:4px 0 0;font-size:13px;line-height:1.45}.modal__close{width:36px;height:36px;color:var(--text-muted);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;transition:background .15s,color .15s,border-color .15s;display:flex}.modal__close:hover{background:var(--surface-3);color:var(--text-primary);border-color:var(--border-subtle)}.modal__body{-webkit-overflow-scrolling:touch;flex:1;min-height:0;padding:1.25rem;overflow-y:auto}.modal__body--flush{padding-top:0}.modal__footer{border-top:1px solid var(--border-subtle);background:var(--surface-2);flex-shrink:0;justify-content:flex-end;align-items:center;gap:10px;padding:1rem 1.25rem;display:flex}.modal__footer .btn-primary,.modal__footer .btn-ghost{min-height:42px;padding:0 16px}.modal-alert{background:var(--danger-bg);color:var(--danger);border:1px solid #f14c4c59;border-radius:8px;margin-bottom:1rem;padding:10px 14px;font-size:13px;line-height:1.45}.modal-steps{gap:8px;margin-bottom:1.25rem;display:flex}.modal-step{background:var(--surface-3);border-radius:999px;flex:1;height:4px;transition:background .2s}.modal-step--active{background:var(--primary)}.modal-step--done{background:var(--success)}.modal-step-label{letter-spacing:.06em;text-transform:uppercase;color:var(--text-muted);margin-bottom:1rem;font-size:12px;font-weight:600;display:block}.form-group{margin-bottom:1rem}.form-group:last-child{margin-bottom:0}.form-group label,.form-label{letter-spacing:.04em;text-transform:uppercase;color:var(--text-muted);margin-bottom:8px;font-size:12px;font-weight:600;display:block}.form-group input,.form-group select,.form-group textarea,.form-input,.form-textarea,.form-select{border:1px solid var(--border-medium);background:var(--surface-2);width:100%;min-height:44px;color:var(--text-primary);font-size:14px;font-family:var(--font-body);border-radius:8px;padding:0 14px;line-height:1.4;transition:border-color .15s,box-shadow .15s,background .15s}.form-group textarea,.form-textarea{resize:vertical;min-height:120px;padding:12px 14px;line-height:1.55}.form-group input::placeholder,.form-group textarea::placeholder,.form-input::placeholder,.form-textarea::placeholder{color:var(--text-soft)}.form-group input:hover,.form-group select:hover,.form-group textarea:hover,.form-input:hover,.form-textarea:hover{border-color:var(--border-strong);background:var(--surface-hover)}.form-group input:focus,.form-group select:focus,.form-group textarea:focus,.form-input:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 1px var(--primary);background:var(--surface-2);outline:none}.form-group input:disabled,.form-group textarea:disabled,.form-input:disabled,.form-textarea:disabled{opacity:.55;cursor:not-allowed}.form-group input[type=date],.form-group input[type=datetime-local],.form-group input[type=time]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}.form-hint{color:var(--text-soft);margin-top:6px;font-size:12px;line-height:1.45}.form-hint--below-title{margin-top:-4px;margin-bottom:12px}.form-check{border:1px solid var(--border-subtle);background:var(--surface-2);cursor:pointer;border-radius:10px;align-items:flex-start;gap:10px;padding:12px 14px;transition:border-color .15s,background .15s;display:flex}.form-check:hover{border-color:var(--border-medium);background:var(--surface-hover)}.form-check input[type=checkbox]{width:18px;height:18px;accent-color:var(--primary);cursor:pointer;flex-shrink:0;margin-top:2px}.form-check__text{flex:1;min-width:0}.form-check__label{color:var(--text-primary);margin-bottom:2px;font-size:14px;font-weight:600;display:block}.form-check__hint{color:var(--text-muted);font-size:12px;line-height:1.45}.form-upload-grid{grid-template-columns:1fr 1fr;gap:12px;display:grid}.form-upload-box{border:1px dashed var(--border-medium);background:var(--surface-2);border-radius:10px;flex-direction:column;gap:8px;padding:14px;transition:border-color .15s,background .15s;display:flex}.form-upload-box:hover{border-color:var(--border-strong);background:var(--surface-hover)}.form-upload-box label{margin-bottom:0;font-size:11px}.form-upload-box input[type=file]{width:100%;min-height:auto;color:var(--text-secondary);background:0 0;border:none;padding:0;font-size:13px}.form-upload-box input[type=file]:disabled{opacity:.45}.form-upload-box__name{color:var(--accent-amber);word-break:break-all;font-size:12px}.form-section-title{color:var(--text-primary);margin:0 0 12px;font-size:14px;font-weight:600}@media (max-width:640px){.modal{border-radius:12px;max-height:calc(100dvh - 24px)}.modal__footer{flex-direction:column-reverse;align-items:stretch}.modal__footer .btn-primary,.modal__footer .btn-ghost{justify-content:center;width:100%;min-height:44px}.form-upload-grid{grid-template-columns:1fr}}.confirm-dialog__message{color:var(--text-secondary);margin:0;font-size:14px;line-height:1.55}.modal-overlay--top{z-index:var(--z-dialog-elevated)}.modal--pdf{max-width:900px;height:min(92vh,900px)}.modal--pdf .modal__body--flush{flex:1;min-height:0;padding:0;display:flex}.pdf-modal__frame{background:#fff;border:none;flex:1;width:100%;min-height:60vh}.note-view__image{border:1px solid var(--border-subtle);cursor:zoom-in;border-radius:10px;width:100%}.note-view__text{white-space:pre-wrap;color:var(--text-secondary);font-size:14px;line-height:1.6}.note-view__pdf-btn{align-items:center;gap:8px;display:inline-flex}.note-view__zoom{z-index:var(--z-dialog-zoom);cursor:zoom-out;background:#000000e6;justify-content:center;align-items:center;padding:24px;display:flex;position:fixed;inset:0}.note-view__zoom-img{object-fit:contain;border-radius:8px;max-width:100%;max-height:100%}.video-panel{margin-bottom:1.25rem}.video-panel__head{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px;display:flex}.video-panel__title{margin-bottom:4px;font-size:1.1rem}.video-panel__meta{color:var(--text-muted);font-size:13px}.video-panel__desc{color:var(--text-secondary);margin-bottom:12px;font-size:14px}.video-panel__player{border:1px solid var(--border-subtle);background:#000;border-radius:10px;width:100%;max-height:480px}.mcq-list{content-visibility:auto;flex-direction:column;gap:12px;display:flex}.mcq-card{background:var(--surface-1);border:1px solid var(--border-subtle);border-radius:10px;padding:1.1rem 1.2rem}.mcq-card__question{font-size:var(--text-md);color:var(--text-primary);font-weight:500;line-height:var(--leading-relaxed);letter-spacing:-.01em;margin-bottom:10px}.mcq-badge{border-radius:999px;margin-bottom:10px;padding:3px 10px;font-size:11px;font-weight:600;display:inline-block}.mcq-options{flex-direction:column;gap:8px;display:flex}.mcq-option{border:1px solid var(--border-subtle);background:var(--surface-2);color:var(--text-secondary);font-size:var(--text-base);line-height:var(--leading-normal);cursor:pointer;border-radius:8px;padding:10px 14px;transition:border-color .15s,background .15s,color .15s}.mcq-option:hover:not(.mcq-option--locked){border-color:var(--border-accent);background:var(--surface-3);color:var(--text-primary)}.mcq-option--locked{cursor:default}.mcq-option--correct{border-color:var(--success);background:var(--success-bg);color:var(--success)}.mcq-option--wrong{border-color:var(--danger);background:var(--danger-bg);color:var(--danger)}.mcq-feedback{border-radius:8px;margin-top:12px;padding:12px 14px;font-size:14px}.mcq-feedback--correct{background:var(--success-bg);color:var(--success);border:1px solid #4ec9b04d}.mcq-feedback--wrong{background:var(--danger-bg);color:var(--danger);border:1px solid #f14c4c4d}.mcq-feedback p{color:inherit;margin-top:6px}.chat-layout{grid-template-columns:280px 1fr;gap:14px;min-height:480px;display:grid}@media (max-width:768px){.chat-layout{grid-template-columns:1fr}}.chat-sidebar{border:1px solid var(--border-subtle);background:var(--surface-1);border-radius:12px;overflow:hidden}.chat-thread{text-align:left;border:none;border-bottom:1px solid var(--border-subtle);cursor:pointer;background:0 0;width:100%;padding:12px 14px;transition:background .15s;display:block}.chat-thread:hover{background:var(--surface-3)}.chat-thread--active{background:var(--primary-soft);border-left:3px solid var(--primary)}.chat-main{border:1px solid var(--border-subtle);background:var(--surface-1);border-radius:12px;flex-direction:column;min-height:480px;display:flex}.chat-messages{flex-direction:column;flex:1;gap:10px;padding:1rem;display:flex;overflow-y:auto}.chat-message{border-radius:10px;max-width:80%;padding:10px 14px;font-size:14px;line-height:1.5}.chat-message--own{background:var(--primary);color:#fff;align-self:flex-end}.chat-message--other{background:var(--surface-3);color:var(--text-primary);align-self:flex-start}.chat-input-bar{border-top:1px solid var(--border-subtle);gap:8px;padding:12px;display:flex}.chat-input-bar input{border:1px solid var(--border-medium);background:var(--surface-1);min-height:42px;color:var(--text-primary);border-radius:8px;flex:1;padding:0 12px;font-size:14px}.flashcard-review{text-align:center;background:var(--surface-1);border:1px solid var(--border-subtle);cursor:pointer;max-width:520px;min-height:280px;box-shadow:var(--shadow-card);border-radius:12px;flex-direction:column;justify-content:center;align-items:center;margin:0 auto;padding:2rem 1.5rem;display:flex}.flashcard-review__label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:12px;font-size:11px;font-weight:600}.flashcard-review__text{color:var(--text-primary);font-size:1.15rem;font-weight:600;line-height:1.5}.flashcard-actions{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:1.25rem;display:flex}.rank-highlight__value{color:var(--accent-amber);font-size:2rem;font-weight:700;line-height:1}.rank-highlight__label{color:var(--text-muted);margin-top:4px;font-size:13px}.timer-bar{top:var(--shell-bar-height);z-index:50;background:var(--surface-2);border:1px solid var(--border-accent);color:var(--text-primary);box-shadow:var(--shadow-soft);border-radius:8px;justify-content:space-between;align-items:center;margin-bottom:1rem;padding:10px 16px;display:flex;position:sticky}.timer-bar__time{font-variant-numeric:tabular-nums;font-size:1.1rem;font-weight:700}.dash-layout .books-hero{background:var(--surface-1);border:1px solid var(--shell-border);border-left:3px solid var(--primary);box-shadow:var(--shadow-soft);border-radius:8px;justify-content:space-between;align-items:center;gap:2rem;margin-bottom:1.5rem;padding:clamp(1.25rem,3vw,2rem);display:flex}.dash-layout .books-hero__content h1{margin-bottom:8px;font-size:clamp(1.4rem,3vw,1.85rem)}.dash-layout .books-hero__content p{color:var(--text-muted);font-size:15px}.dash-layout .books-hero__content button{background:var(--primary);color:#fff;border:none;border-radius:4px;margin-top:12px;padding:10px 18px;font-size:14px;font-weight:600}.dash-layout .books-hero__content button:hover{background:var(--primary-light)}.dash-layout .board-badge{background:var(--accent-amber-soft);color:var(--accent-amber);border:1px solid var(--accent-amber-muted)}.dash-layout .sidebar{background:var(--shell-sidebar);border-right:1px solid var(--shell-border);box-shadow:none}.dash-layout .sidebar__logo{height:var(--shell-bar-height);min-height:var(--shell-bar-height);max-height:var(--shell-bar-height);box-sizing:border-box;border-bottom:1px solid var(--shell-border);background:var(--shell-sidebar);flex-shrink:0;padding:0 1.25rem}.dash-layout .sidebar__logo-link{min-height:0}.dash-layout .sidebar__logo-icon{width:32px;height:32px}.dash-layout .sidebar__logo-text{color:var(--text-primary);font-family:var(--font-ui);letter-spacing:-.03em;font-size:17px;font-weight:700;line-height:1}.dash-layout .sidebar__logo-accent{color:var(--accent-amber)}.dash-layout .sidebar__section-label{color:var(--text-soft);letter-spacing:.1em;text-transform:uppercase;font-size:10px;font-weight:600}.dash-layout .sidebar__link{color:var(--text-muted);letter-spacing:-.01em;border-radius:6px;font-size:13.5px;font-weight:500}.dash-layout .sidebar__link:hover{background:var(--shell-hover);color:var(--text-primary)}.dash-layout .sidebar__link--active{background:var(--shell-active);color:#fff;border-left:2px solid var(--primary);font-weight:600;box-shadow:inset 0 0 0 1px #007acc14}.dash-layout .sidebar__link--active:hover{background:var(--shell-active);color:#fff}.dash-layout .sidebar__footer{border-top:1px solid var(--shell-border);background:var(--shell-sidebar);min-height:var(--shell-footer-height);height:var(--shell-footer-height);padding:0 var(--space-lg);box-sizing:border-box;flex-shrink:0;align-items:center;display:flex}.dash-layout .sidebar__logout{color:var(--danger);min-height:unset;padding:6px 12px;font-size:12.5px;line-height:1.25}.dash-layout .sidebar__logout:hover{background:var(--danger-bg)}.dash-layout .sidebar-overlay{background:#0009}.dash-layout .dash-header{background:var(--shell-header);border-bottom:1px solid 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h2{color:var(--white);font-size:24px;font-family:var(--font-display);margin-bottom:28px}.notes-section{margin-top:2rem}.notes-header{justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:34px;display:flex}.notes-header-left{flex-direction:column;gap:16px;display:flex}.notes-header-left h2{color:#fff;font-size:26px;font-weight:700}.notes-controls{flex-wrap:wrap;gap:12px;display:flex}.notes-search{color:#fff;background:#0f172a;border:1px solid #ffffff1a;border-radius:10px;width:400px;padding:11px 16px;transition:all .2s}.notes-search:focus{border-color:#14b8a6;outline:none}.notes-filter{color:#fff;background:#0f172a;border:1px solid #ffffff1a;border-radius:10px;min-width:150px;padding:8px}.add-note-btn{color:#fff;cursor:pointer;background:#14b8a6;border:none;border-radius:12px;justify-content:center;align-items:center;height:44px;padding:12px 20px;font-weight:600;transition:all .25s;display:flex}.add-note-btn:hover{background:#2dd4bf}.notes-header h2{font-size:26px;font-weight:700}.notes-card:hover{transform:translateY(-4px);box-shadow:0 18px 36px #00000073}.notes-card__header{justify-content:space-between;align-items:center;display:flex}.notes-card__title{color:var(--teal-300);font-size:18px;font-weight:700}.notes-card__date{color:var(--graphite);font-size:12px}.notes-card__content{color:var(--cloud);text-overflow:ellipsis;max-height:120px;font-size:14px;line-height:1.6;overflow:hidden}.notes-card__actions{gap:12px;margin-top:auto;display:flex}.notes-card__btn--edit{background:var(--teal-400);color:var(--white)}.notes-card__btn--edit:hover{background:var(--teal)}.notes-card__btn--delete{color:var(--coral);background:#f9706614}.notes-card__btn--delete:hover{background:#f9706626}.note-card__btn{color:#fff;cursor:pointer;background:#14b8a6;border:none;border-radius:8px;padding:8px 14px;font-size:13px;font-weight:600;transition:all .2s}.note-card__btn:hover{background:#2dd4bf}.notes-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:26px;display:grid}.note-card{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#0f172a99;border:1px solid #ffffff14;border-radius:18px;padding:20px;transition:all .3s;box-shadow:0 12px 30px #0006}.note-card:hover{border-color:#14b8a659;transform:translateY(-6px);box-shadow:0 20px 45px #00000080}.note-card__title{color:#fff;margin-bottom:10px;font-size:18px;font-weight:600}.note-card__subject{color:#9ca3af;font-size:14px}.note-card__subject span{font-weight:500}.note-card__footer{justify-content:space-between;align-items:center;margin-top:16px;display:flex}.type-badge{letter-spacing:.4px;border-radius:20px;padding:6px 12px;font-size:11px;font-weight:600}.type-badge.formula{color:#38bdf8;background:#38bdf826}.type-badge.shortcut{color:#22c55e;background:#22c55e26}.note-card{position:relative}.note-card__menu{position:absolute;top:12px;right:12px}.menu-btn{color:#9ca3af;cursor:pointer;background:0 0;border:none;border-radius:6px;padding:6px;transition:all .2s}.menu-btn:hover{color:#fff;background:#1f2937}.menu-dropdown{background:#111827;border:1px solid #ffffff14;border-radius:10px;width:140px;animation:.15s menuFade;position:absolute;top:34px;right:0;overflow:hidden;box-shadow:0 12px 30px #00000073}@keyframes menuFade{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.menu-item{color:#e5e7eb;cursor:pointer;background:0 0;border:none;align-items:center;gap:8px;width:100%;padding:10px 12px;font-size:13px;transition:all .2s;display:flex}.menu-item:hover{background:#1f2937}.menu-item.danger{color:#f87171}.menu-item.danger:hover{background:#2a1a1a}.note-modal-overlay{z-index:var(--z-dialog);background:#000000a6;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.note-modal{background:#111827;border-radius:18px;width:500px;max-width:90%;padding:30px;box-shadow:0 25px 60px #0009}.note-modal h3{margin-bottom:20px}.note-form{flex-direction:column;gap:12px;display:flex}.note-form input,.note-form textarea,.note-form select{color:#fff;background:#0f172a;border:1px solid #ffffff1a;border-radius:8px;padding:12px}.note-modal-actions{justify-content:flex-end;gap:10px;margin-top:10px;display:flex}.note-modal-actions button{border-radius:8px;padding:10px 16px}.note-modal-actions .primary{color:#fff;background:#14b8a6}.view-modal{position:relative}.modal-close{color:#9ca3af;cursor:pointer;background:0 0;border:none;font-size:20px;position:absolute;top:14px;right:16px}.modal-close:hover{color:#fff}.view-title{color:#fff;margin-bottom:10px;font-size:22px;font-weight:700}.note-meta{color:#9ca3af;margin-bottom:8px;font-size:14px}.note-meta span{color:#e5e7eb}.note-content{color:#e5e7eb;background:#0f172a;border-radius:10px;margin-top:16px;padding:14px;line-height:1.6}.toggle-tabs{border:1px solid #ddd;border-radius:30px;margin:20px 0;display:inline-flex;overflow:hidden}.toggle-tab{color:#555;cursor:pointer;background:#fff;border:none;padding:10px 28px;font-size:14px;font-weight:600;transition:all .25s}.toggle-tab:hover{background:#f3f3f3}.toggle-tab--active{color:#fff;background:#2dd4bf}.pdf-modal iframe::-webkit-scrollbar{width:8px}.pdf-modal iframe::-webkit-scrollbar-thumb{background-color:#0006;border-radius:4px}.vs-page{width:100%}.vs-hero{justify-content:space-between;align-items:center;gap:var(--space-xl);padding:var(--space-2xl);margin-bottom:var(--space-xl);border-radius:var(--radius-lg);background:linear-gradient(135deg,#0ea5a024 0%,#38bdf814 55%,#a78bfa0f 100%);border:1px solid #0ea5a02e;display:flex}.vs-hero__content{flex:1;max-width:640px}.vs-hero__badge{margin-bottom:var(--space-md);border-radius:var(--radius-full);color:var(--teal-300);letter-spacing:.06em;text-transform:uppercase;background:#0ea5a026;align-items:center;gap:6px;padding:6px 12px;font-size:11px;font-weight:700;display:inline-flex}.vs-hero__content h1{margin-bottom:var(--space-sm);font-size:clamp(1.75rem,3vw,2.25rem)}.vs-hero__content p{color:var(--mist);font-size:15px;line-height:1.7}.vs-hero__stats{gap:var(--space-sm);flex-direction:column;flex-shrink:0;display:flex}.vs-stat-pill{border-radius:var(--radius-md);min-width:180px;color:var(--cloud);background:#0b112073;border:1px solid #ffffff14;align-items:center;gap:10px;padding:12px 16px;font-size:13px;display:flex}.vs-stat-pill svg{color:var(--teal-400);flex-shrink:0}.vs-layout{gap:var(--space-xl);grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);align-items:start;display:grid}@media (max-width:1024px){.vs-layout{grid-template-columns:1fr}.vs-hero{flex-direction:column;align-items:flex-start}.vs-hero__stats{flex-flow:wrap;width:100%}.vs-stat-pill{flex:1;min-width:140px}}.vs-panel{padding:var(--space-lg);border-radius:var(--radius-lg);background:#ffffff08;border:1px solid #ffffff0f}.vs-panel+.vs-panel{margin-top:var(--space-md)}.vs-panel__title{color:var(--white);margin-bottom:var(--space-md);align-items:center;gap:8px;font-size:15px;font-weight:700;display:flex}.vs-panel__subtitle{color:var(--graphite);margin-top:-8px;margin-bottom:var(--space-md);font-size:13px}.vs-input-row{gap:var(--space-sm);display:flex}@media (max-width:640px){.vs-input-row{flex-direction:column}}.vs-input-wrap{flex:1;position:relative}.vs-input-wrap svg{color:var(--graphite);pointer-events:none;position:absolute;top:50%;left:14px;transform:translateY(-50%)}.vs-input{border-radius:var(--radius-md);width:100%;color:var(--white);transition:border-color var(--duration-fast)ease,box-shadow var(--duration-fast)ease;background:#0b11208c;border:1px solid #ffffff14;padding:13px 16px 13px 42px;font-size:14px}.vs-input:focus{border-color:var(--teal);outline:none;box-shadow:0 0 0 3px #0ea5a01f}.vs-input::placeholder{color:var(--graphite)}.vs-submit{border-radius:var(--radius-md);background:linear-gradient(135deg,var(--teal),var(--teal-400));color:var(--white);white-space:nowrap;transition:transform var(--duration-fast)ease,box-shadow var(--duration-fast)ease;justify-content:center;align-items:center;gap:8px;padding:13px 22px;font-size:14px;font-weight:700;display:inline-flex;box-shadow:0 4px 18px #0ea5a047}.vs-submit:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 22px #0ea5a061}.vs-submit:disabled{opacity:.55;cursor:not-allowed}.vs-feedback{margin-top:var(--space-sm);min-height:20px;font-size:13px}.vs-feedback--ok{color:var(--teal-300)}.vs-feedback--warn{color:var(--amber-light)}.vs-feedback--muted{color:var(--graphite)}.vs-tags{margin-top:var(--space-md);flex-wrap:wrap;gap:8px;display:flex}.vs-tag{border-radius:var(--radius-full);color:var(--mist);background:#ffffff0a;border:1px solid #ffffff0f;padding:5px 11px;font-size:11px;font-weight:600}.vs-steps{gap:var(--space-md);flex-direction:column;display:flex}.vs-step{gap:12px;display:flex}.vs-step__num{width:28px;height:28px;color:var(--teal-300);background:#0ea5a026;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:800;display:flex}.vs-step__body h4{margin-bottom:4px;font-size:14px;font-weight:600}.vs-step__body p{color:var(--graphite);font-size:13px;line-height:1.55}.vs-tips{flex-direction:column;gap:10px;display:flex}.vs-tip{color:var(--mist);gap:10px;font-size:13px;line-height:1.5;display:flex}.vs-tip svg{color:var(--teal-400);flex-shrink:0;margin-top:2px}.vs-section-head{justify-content:space-between;align-items:center;gap:var(--space-md);margin-bottom:var(--space-md);display:flex}.vs-section-head h2{font-size:18px}.vs-section-head p{color:var(--graphite);margin-top:4px;font-size:13px}.vs-grid{gap:var(--space-md);grid-template-columns:repeat(auto-fill,minmax(240px,1fr));display:grid}.vs-card{text-align:left;padding:var(--space-md);border-radius:var(--radius-md);transition:all var(--duration-fast)var(--ease-out);cursor:pointer;background:#ffffff08;border:1px solid #ffffff0f;flex-direction:column;display:flex}.vs-card:hover{box-shadow:var(--shadow-md);border-color:#0ea5a059;transform:translateY(-3px)}.vs-card--active{background:#0ea5a014;border-color:#0ea5a080}.vs-card__top{justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:10px;display:flex}.vs-card__title{color:var(--white);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:14px;font-weight:600;line-height:1.4;display:-webkit-box;overflow:hidden}.vs-status{border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.04em;flex-shrink:0;padding:4px 8px;font-size:10px;font-weight:700}.vs-status--pending{color:var(--amber-light);background:#f59e0b26}.vs-status--processing{color:var(--sky);background:#38bdf826}.vs-status--completed{color:#34d399;background:#10b98126}.vs-status--failed{color:#fca5a5;background:#ef444426}.vs-card__url{color:var(--graphite);-webkit-line-clamp:1;-webkit-box-orient:vertical;margin-bottom:10px;font-size:11px;display:-webkit-box;overflow:hidden}.vs-card__progress{color:var(--teal-300);margin-bottom:8px;font-size:12px}.vs-card__preview{color:var(--mist);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:12px;line-height:1.5;display:-webkit-box;overflow:hidden}.vs-empty{padding:var(--space-3xl)var(--space-xl);text-align:center;border-radius:var(--radius-lg);background:#ffffff05;border:1px dashed #ffffff1a}.vs-empty svg{color:var(--graphite);margin:0 auto 16px}.vs-empty h3{margin-bottom:8px;font-size:17px}.vs-empty p{color:var(--graphite);max-width:360px;margin:0 auto;font-size:14px}.vs-detail{padding:var(--space-xl);border-radius:var(--radius-lg);margin-bottom:var(--space-xl);background:#ffffff08;border:1px solid #ffffff14}.vs-detail__head{justify-content:space-between;align-items:flex-start;gap:var(--space-md);margin-bottom:var(--space-md);display:flex}.vs-detail__head h2{margin-bottom:6px;font-size:22px}.vs-detail__link{color:var(--graphite);word-break:break-all;font-size:13px}.vs-detail__link:hover{color:var(--teal-300)}.vs-close{border-radius:var(--radius-sm);color:var(--mist);margin-bottom:var(--space-md);background:#ffffff0a;border:1px solid #ffffff14;align-items:center;gap:6px;padding:8px 12px;font-size:13px;font-weight:500;display:inline-flex}.vs-close:hover{color:var(--white);background:#ffffff12}.vs-progress-bar{border-radius:var(--radius-md);color:var(--mist);margin-bottom:var(--space-lg);background:#0b112073;border:1px solid #ffffff0f;padding:12px 16px;font-size:13px}.vs-progress-bar--error{color:#fecaca;background:#ef444414;border-color:#ef444440}.vs-block{margin-top:var(--space-xl)}.vs-block h3{margin-bottom:var(--space-md);padding-bottom:var(--space-sm);border-bottom:1px solid #ffffff0f;align-items:center;gap:8px;font-size:16px;display:flex}.vs-block p,.vs-block li{color:var(--mist);font-size:14px;line-height:1.7}.vs-block ul{padding-left:20px}.vs-block ul li+li{margin-top:8px}.vs-flash-grid{gap:var(--space-md);grid-template-columns:repeat(auto-fill,minmax(220px,1fr));display:grid}.vs-flash{padding:var(--space-md);border-radius:var(--radius-md);background:#0b112080;border:1px solid #ffffff0f}.vs-flash__q{color:var(--white);margin-bottom:8px;font-size:14px;font-weight:600}.vs-flash__a{color:var(--mist);font-size:13px}.vs-mcq{padding:var(--space-md);border-radius:var(--radius-md);background:#0b112080;border:1px solid #ffffff0f}.vs-mcq+.vs-mcq{margin-top:var(--space-md)}.vs-mcq__stem{color:var(--white);margin-bottom:12px;font-size:14px;font-weight:600}.vs-mcq__opt{border-radius:var(--radius-sm);color:var(--mist);background:#ffffff0a;margin-bottom:8px;padding:10px 12px;font-size:13px}.vs-mcq__opt--correct{color:#6ee7b7;background:#10b98126;border:1px solid #10b98140}.vs-mcq__btn{color:var(--teal-300);background:0 0;margin-top:8px;padding:0;font-size:13px;font-weight:600}.vs-mcq__btn:hover{color:var(--teal-400)}.vs-mcq__explain{color:var(--graphite);margin-top:10px;font-size:13px}.vs-retry{border-radius:var(--radius-sm);color:#fecaca;background:#ef44441f;align-items:center;gap:6px;margin-top:12px;padding:8px 14px;font-size:13px;font-weight:600;display:inline-flex}.vs-retry:hover{background:#ef444433}.vs-loading{color:var(--graphite);align-items:center;gap:10px;font-size:14px;display:flex}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-duration{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}