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cubic-bezier(.4,0,.6,1);display:inline-flex}.btn-blue-large:hover{background:var(--apple-blue-hover);border-color:var(--apple-blue-hover)}.btn-blue-large:active{transform:scale(.97)}.btn-blue-large:disabled{opacity:.45;cursor:not-allowed}.chip{background:var(--filter-bg);border:1px solid var(--border-subtle);color:var(--text-secondary);letter-spacing:-.01em;white-space:nowrap;border-radius:980px;align-items:center;padding:4px 11px;font-size:12px;font-weight:500;display:inline-flex}.chip-difficulty-easy{background:var(--success-bg);color:var(--success-fg);border-color:#0000}.chip-difficulty-medium{background:var(--warning-bg);color:var(--warning-fg);border-color:#0000}.chip-difficulty-hard{background:var(--error-bg);color:var(--error-fg);border-color:#0000}.input-apple{background:var(--filter-bg);width:100%;color:var(--text-primary);border:1px solid var(--border-subtle);letter-spacing:-.016em;border-radius:11px;padding:9px 14px;font-size:14px;line-height:1.4;transition:all 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.dot{background:var(--error-fg)}.filter-pill{background:var(--filter-bg);border:1px solid var(--border-subtle);color:var(--text-secondary);letter-spacing:-.016em;cursor:pointer;white-space:nowrap;border-radius:980px;align-items:center;padding:6px 14px;font-size:13px;font-weight:500;line-height:1;transition:all .18s;display:inline-flex}.filter-pill:hover{background:var(--button-active);color:var(--text-primary)}.filter-pill.is-active{background:var(--apple-blue);border-color:var(--apple-blue);color:#fff}.filter-pill.is-active:hover{background:var(--apple-blue-hover);border-color:var(--apple-blue-hover)}.quiz-list-item{text-align:left;letter-spacing:-.016em;width:100%;color:var(--text-secondary);cursor:pointer;background:0 0;border:0;border-radius:10px;align-items:center;gap:8px;padding:9px 12px;font-size:14px;transition:background-color .18s,color 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button.is-active{background:var(--surface-card);color:var(--text-primary);box-shadow:0 1px 2px #0000000f}.app-topbar{z-index:30;background:var(--surface-sidebar);-webkit-backdrop-filter:saturate(180%)blur(20px);border-bottom:1px solid var(--border-subtle);align-items:center;gap:12px;height:52px;padding:0 14px;display:flex;position:sticky;top:0}.topbar-brand{letter-spacing:-.022em;color:var(--text-primary);font-family:SF Pro Display,-apple-system,sans-serif;font-size:17px;font-weight:600}.menu-button{width:36px;height:36px;color:var(--text-primary);cursor:pointer;background:0 0;border:0;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;transition:background-color .18s;display:inline-flex}.menu-button:hover{background:var(--ghost-hover)}.drawer-backdrop{z-index:40;opacity:0;pointer-events:none;background:#0006;transition:opacity .2s;position:fixed;inset:0}.drawer-backdrop.is-visible{opacity:1;pointer-events:auto}.app-sidebar{z-index:50;width:280px;max-width:85vw;transition:transform .28s cubic-bezier(.4,0,.2,1);position:fixed;inset:0 auto 0 0;overflow-y:auto;transform:translate(-100%)}.app-sidebar.is-open{transform:translate(0)}@media(min-width:1024px){.app-topbar,.drawer-backdrop{display:none}.app-sidebar{z-index:auto;flex-shrink:0;width:260px;max-width:none;height:100vh;position:sticky;top:0;overflow-y:hidden;transform:none}}@media(max-width:640px){.type-display-xl{font-size:40px}.type-display-lg{letter-spacing:-.003em;font-size:30px}.type-display-md{font-size:26px}.type-display-sm{font-size:21px}.type-card-title{font-size:19px}.type-body-lg{font-size:17px;line-height:1.47}}@keyframes cardEnter{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.question-card-enter{animation:.28s cubic-bezier(.42,0,.21,1) cardEnter}@keyframes fadeInUp{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.answer-block{animation:.24s cubic-bezier(.42,0,.21,1) fadeInUp}@keyframes pulse{0%,to{opacity:1}50%{opacity:.45}}.markdown-content{letter-spacing:-.022em;color:var(--text-secondary);font-size:17px;line-height:1.5}.markdown-content code{background:var(--filter-bg);border:1px solid var(--border-subtle);border-radius:5px;padding:1px 6px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:14px}.markdown-content pre{background:var(--filter-bg);border:1px solid var(--border-subtle);border-radius:12px;padding:16px 18px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:13.5px;line-height:1.5;overflow-x:auto}.markdown-content pre code{font-size:inherit;background:0 0;border:0;padding:0}.markdown-content strong{color:var(--text-primary);font-weight:600}.progress-track{background:var(--track-bg);border-radius:980px;width:100%;height:6px;overflow:hidden}.progress-fill{background:var(--apple-blue);border-radius:980px;height:100%;transition:width .4s cubic-bezier(.4,0,.2,1),background-color .4s}.progress-fill.is-complete{background:var(--success-fg)}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 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--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-ease{syntax:"*";inherits:false}