:root{--bg-primary: #0D1421;--bg-card: #172035;--bg-group: #111928;--bg-elevated: #1F2E45;--text-primary: #F2F2F7;--text-secondary: #98989F;--text-tertiary: #48484E;--accent: #0A84FF;--accent-pressed: #409CFF;--accent-glow: rgba(10, 132, 255, .18);--danger: #FF453A;--success: #30D158;--warning: #FFD60A;--divider: rgba(255, 255, 255, .06);--divider-strong: rgba(255, 255, 255, .12);--shadow-sm: 0 1px 4px rgba(0,0,0,.4);--shadow-md: 0 4px 16px rgba(0,0,0,.5), 0 1px 4px rgba(0,0,0,.3);--shadow-lg: 0 8px 32px rgba(0,0,0,.6), 0 2px 8px rgba(0,0,0,.4);--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-card: 18px;--radius-max: 30px;--radius-pill: 999px;--transition: .2s ease;--tab-bar-height: 83px;--page-max-width: 640px;--cat-science: #0A84FF;--cat-math: #FF453A;--cat-history: #FF9F0A;--cat-philosophy: #BF5AF2;--cat-psychology: #FF375F;--cat-art: #FF6B35;--cat-tech: #5AC8FA;--cat-economics: #30D158;--cat-nature: #30D158;--cat-medicine: #FF6961;--cat-space: #5E5CE6;--cat-language: 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#636366);line-height:1}.stack-nav{position:absolute;top:50%;transform:translateY(-50%);background:transparent;border:none;color:var(--text-tertiary);font-size:1.8rem;line-height:1;padding:0 6px;cursor:pointer}.stack-nav--prev{left:-32px}.stack-nav--next{right:-32px}.card{background:var(--bg-card)!important;border:.5px solid var(--divider-strong)!important;border-radius:var(--radius-card)!important;color:var(--text-primary)!important;box-shadow:var(--shadow-md)!important}.card-portrait{aspect-ratio:6 / 5;max-width:520px;width:100%;margin-left:auto;margin-right:auto}.composer-card{max-width:520px;width:100%;margin-left:auto;margin-right:auto}.card-portrait .card-body{display:flex;flex-direction:column;height:100%}.card-body--feed{position:relative!important;height:100%!important;padding:0!important;display:block!important}.card-body--feed 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.logout-btn{opacity:1;pointer-events:auto;transform:translate(calc(-50% + 32px),-50%)}.admin-sidebar{position:fixed;left:0;top:50%;height:66vh;transform:translateY(-50%);width:54px;background:#f2f2f7e6;border-right:1px solid var(--divider);border-radius:0 var(--radius-md) var(--radius-md) 0;display:flex;align-items:center;justify-content:center;transition:width .4s ease;z-index:20;overflow:hidden;box-shadow:var(--shadow-md)}.admin-sidebar__handle{writing-mode:vertical-rl;text-orientation:mixed;letter-spacing:.2em;color:var(--text-secondary);font-size:.8rem}.admin-sidebar__content{position:absolute;left:0;top:0;height:100%;width:240px;opacity:0;transform:translate(-10px);transition:opacity .4s ease,transform .4s ease;padding:18px 20px}.admin-sidebar:hover{width:240px}.admin-sidebar:hover .admin-sidebar__content{opacity:1;transform:translate(0)}.app-shell--shift{padding-left:200px}.page-drop{animation:page-drop .4s ease}.page-drop--slow{animation-duration:.8s}@keyframes 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#007AFF}.tag-chip--insight{--tag-color: #FF9500}.tag-chip--challenge{--tag-color: #FF3B30}.tag-chip--gratitude{--tag-color: #34C759}.tag-chip--inspiration{--tag-color: #BF5AF2}.tag-chip--question.tag-chip--active,.tag-chip--question.tag-chip--sm{border-color:#007aff66;color:#007aff}.tag-chip--insight.tag-chip--active,.tag-chip--insight.tag-chip--sm{border-color:#ff950066;color:#ff9500}.tag-chip--challenge.tag-chip--active,.tag-chip--challenge.tag-chip--sm{border-color:#ff3b3066;color:#ff3b30}.tag-chip--gratitude.tag-chip--active,.tag-chip--gratitude.tag-chip--sm{border-color:#34c75966;color:#34c759}.tag-chip--inspiration.tag-chip--active,.tag-chip--inspiration.tag-chip--sm{border-color:#bf5af266;color:#bf5af2}.card-tag-badge{text-align:center;margin-bottom:.5rem}.feed-mode-bar{display:flex;justify-content:center;gap:4px;margin-bottom:.75rem}.feed-mode-btn{padding:6px 16px;border-radius:var(--radius-pill);font-size:.85rem;font-weight:500;border:1.5px solid var(--divider);background:transparent;color:var(--text-tertiary);cursor:pointer;transition:all var(--transition)}.feed-mode-btn:hover{color:var(--text-secondary)}.feed-mode-btn--active{border-color:var(--accent);background:#007aff14;color:var(--accent)}.tag-filter-bar{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:1rem}.tag-filter-btn{padding:4px 12px;border-radius:var(--radius-pill);font-size:.8rem;border:1.5px solid var(--divider);background:var(--bg-card);color:var(--text-tertiary);cursor:pointer;transition:all 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.collection-tile__actions{opacity:1}.collection-tile__edit{width:100%}.collection-detail-header{display:flex;align-items:center;gap:10px;margin-bottom:16px}.collection-detail-title{font-size:1.1rem;font-weight:700;color:var(--text-primary)}.collection-detail-count{font-size:.8rem;color:var(--text-tertiary);margin-left:auto}.collection-cards-grid{display:flex;flex-direction:column;gap:10px;max-height:calc(100vh - 320px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--divider) transparent}.collection-card-item{background:var(--bg-card);border:1px solid var(--divider);border-radius:var(--radius-md);padding:12px 16px;transition:background var(--transition);box-shadow:var(--shadow-sm)}.collection-card-item:hover{box-shadow:var(--shadow-md)}.collection-card-item__content{font-size:.9rem;color:var(--text-primary);line-height:1.5;margin-bottom:8px;word-break:break-word}.collection-card-item__footer{display:flex;align-items:center;gap:10px;font-size:.75rem;color:var(--text-tertiary)}.collection-card-item__stats{margin-left:auto}@media (max-width: 520px){.collections-grid{grid-template-columns:repeat(2,1fr);gap:8px}.collection-tile__actions{opacity:1}}.saved-card-count{text-align:center;margin-top:12px;color:var(--text-tertiary);font-size:.88rem}.saved-collection-add{position:absolute;left:min(calc(50% + var(--card-max-w) / 2 + 6px),calc(100% - 44px));top:8px;z-index:10}.collection-picker-dropdown{position:absolute;top:100%;right:0;background:var(--bg-card);border:1px solid var(--divider);border-radius:var(--radius-md);padding:6px;min-width:180px;max-height:200px;overflow-y:auto;z-index:20;box-shadow:var(--shadow-lg);margin-top:6px}.collection-picker-item{display:block;width:100%;background:none;border:none;color:var(--text-secondary);font-size:.85rem;padding:8px 12px;text-align:left;border-radius:var(--radius-sm);cursor:pointer;transition:background var(--transition)}.collection-picker-item:hover{background:var(--bg-group);color:var(--text-primary)}.detail-page-shell{max-width:600px;margin:0 auto;min-height:calc(100vh - var(--tab-bar-height));max-height:calc(100vh - 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