:root{--teal: #4ECDC4;--teal-dark: #3BBBB3;--dark-navy: #0D1F2D;--dark-surface: #112233;--dark-card: #1A3040;--dark-header: #0A1A27;--text-primary: #FFFFFF;--text-secondary: rgba(255, 255, 255, .6);--border-color: rgba(255, 255, 255, .08);--shadow-card: 0 8px 32px rgba(0, 0, 0, .4);--font: "Lato", sans-serif;--radius: 20px}[data-theme=light]{--dark-navy: #F2F4F6;--dark-surface: #FFFFFF;--dark-card: #FFFFFF;--dark-header: #FFFFFF;--text-primary: #0D1F2D;--text-secondary: rgba(13, 31, 45, .55);--border-color: rgba(0, 0, 0, .08);--shadow-card: 0 8px 32px rgba(0, 0, 0, .1)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;padding:0;height:100%;width:100%;font-family:var(--font);background:var(--dark-navy);color:var(--text-primary);-webkit-font-smoothing:antialiased;overscroll-behavior:none}#app{height:100%;width:100%}.app-layout{display:flex;flex-direction:column;height:100%;background:var(--dark-navy)}.app-header{flex-shrink:0;height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:var(--dark-header);border-bottom:1px solid var(--border-color);z-index:10}.header-actions{display:flex;align-items:center;gap:4px}.icon-btn{background:none;border:none;font-size:18px;cursor:pointer;padding:8px;color:var(--text-secondary);border-radius:50%;transition:background .15s;display:flex;align-items:center;justify-content:center}.icon-btn:hover{background:var(--border-color)}.group-picker{position:relative}.group-picker-active{display:flex;align-items:center;gap:6px;cursor:pointer;-webkit-user-select:none;user-select:none;padding:4px 8px;border-radius:8px;transition:background .15s}.group-picker-active:hover{background:var(--border-color)}.group-name{font-size:17px;font-weight:700;color:var(--text-primary);max-width:65vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.group-chevron{font-size:10px;color:var(--text-secondary);transition:transform .2s}.group-picker-active.open .group-chevron{transform:rotate(180deg)}.group-dropdown{position:absolute;top:calc(100% + 8px);left:0;background:var(--dark-surface);border:1px solid var(--border-color);border-radius:12px;box-shadow:0 12px 40px #0006;min-width:220px;max-height:60vh;overflow-y:auto;z-index:100}.group-dropdown.hidden{display:none}.group-option{padding:13px 16px;cursor:pointer;font-size:15px;font-weight:500;color:var(--text-primary);transition:background .15s}.group-option:hover{background:var(--border-color)}.group-option.selected{color:var(--teal)}.flashcards-main{flex:1;display:flex;min-height:0;position:relative}.scrubber-sidebar{width:44px;flex-shrink:0;display:flex;align-items:stretch;z-index:5}.carousel-area{flex:1;min-width:0;min-height:0;position:relative}.loading-state,.empty-state,.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:12px;color:var(--text-secondary);font-size:15px}.spinner{width:36px;height:36px;border:3px solid var(--border-color);border-top-color:var(--teal);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-page{display:flex;align-items:center;justify-content:center;height:100%;padding:24px;background:linear-gradient(160deg,var(--dark-navy) 0%,#0A2A2F 100%)}.login-card{width:100%;max-width:380px;background:var(--dark-surface);border-radius:24px;padding:48px 36px;text-align:center;box-shadow:0 24px 60px #00000080}.login-logo{font-size:36px;font-weight:900;color:var(--teal);letter-spacing:-.5px;margin-bottom:8px}.login-tagline{color:var(--text-secondary);font-size:15px;margin-bottom:36px}.btn-primary{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:14px 24px;background:var(--teal);color:#0d1f2d;font-size:15px;font-weight:800;border:none;border-radius:12px;cursor:pointer;transition:background .2s,transform .1s;font-family:var(--font)}.btn-primary:hover{background:var(--teal-dark)}.btn-primary:active{transform:scale(.98)}.carousel-scroller{height:100%;overflow-y:scroll;scroll-snap-type:y mandatory;scroll-behavior:smooth;-webkit-overflow-scrolling:touch;scrollbar-width:none;display:flex;flex-direction:column;align-items:center;padding-top:15vh;padding-bottom:15vh}.carousel-scroller::-webkit-scrollbar{display:none}.card-wrapper{height:70vh;display:flex;align-items:center;justify-content:center;scroll-snap-align:center;padding:8px 16px 8px 8px;transition:opacity .3s}.flashcard{width:100%;max-width:360px;background:var(--dark-card);border-radius:var(--radius);box-shadow:var(--shadow-card);overflow:hidden;border:2px solid transparent;transition:border-color .3s,transform .3s;cursor:pointer;-webkit-user-select:none;user-select:none}.card-photo-wrap{width:100%;aspect-ratio:1 / 1;overflow:hidden;background:var(--dark-surface);position:relative}.card-avatar{width:100%;height:100%;object-fit:cover;display:block}.card-avatar-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-size:72px;font-weight:900;color:var(--teal);background:linear-gradient(135deg,var(--dark-surface),var(--dark-card));letter-spacing:-2px}.card-info{padding:16px 16px 20px;text-align:center}.card-name{margin:0;font-size:20px;font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.scrubber-list{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;width:100%;padding:10px 0;font-size:10px;font-weight:700;color:var(--text-secondary);background:#0000001a;border-right:1px solid var(--border-color)}.scrubber-letter{flex:1;display:flex;align-items:center;justify-content:center;width:100%;cursor:default;opacity:.3;transition:all .2s;-webkit-user-select:none;user-select:none}.scrubber-letter.has-members{opacity:.7;color:var(--text-primary);cursor:pointer}.scrubber-letter.has-members:hover{opacity:1}.scrubber-letter.is-active{color:var(--teal);opacity:1;font-size:13px;font-weight:900;transform:scale(1.2)}