:root{--font-size-caption: .75rem;--font-size-hint: .8rem;--font-size-label: .85rem;--font-size-meta: var(--font-size-label);--font-size-control: .875rem;--font-size-body-sm: .95rem;--font-size-body: 1rem;--font-size-subtitle: .95rem;--font-size-reading: 1.1rem;--font-size-title-sm: 1.2rem;--control-radius: 6px;--control-padding-y: .35rem;--control-padding-x: .5rem;--control-padding-y-lg: .45rem;--control-padding-x-lg: .65rem;--sync-indicator-reserve: 6rem}@media(max-width:768px),(pointer:coarse){:root{--font-size-caption: .8rem;--font-size-hint: .85rem;--font-size-label: .9rem;--font-size-control: .95rem;--font-size-body-sm: 1rem;--font-size-body: 1.0625rem;--font-size-subtitle: 1rem;--font-size-reading: 1.2rem;--font-size-title-sm: 1.35rem}}:root{--bg: #f4f4f5;--surface: #ffffff;--border: #e4e4e7;--text: #18181b;--text-muted: #71717a;--accent: #2563eb;--sidebar-width: 220px;--status-todo: #ffffff;--status-learning: #fef08a;--status-done: #86efac;--status-todo-border: #d4d4d8;--status-learning-border: #eab308;--status-done-border: #22c55e;--vocab-hanzi-col: calc(6 * 1.35rem + .5rem);--vocab-pinyin-col: 11rem;--layout-mobile-top-bar-height: 0px;--flashcard-status-toolbar-height: 0px;--study-session-options-bar-height: 4.75rem;--study-hub-footer-stack-gap: 1.75rem;--safe-top: var(--safe-area-inset-top, env(safe-area-inset-top, 0px));--safe-right: var(--safe-area-inset-right, env(safe-area-inset-right, 0px));--safe-bottom: var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px));--safe-left: var(--safe-area-inset-left, env(safe-area-inset-left, 0px));font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;color:var(--text);background:var(--bg)}@media(max-width:768px),(pointer:coarse){:root{--text-muted: #52525b}}*,*:before,*:after{box-sizing:border-box}html,body,#root{height:100%;margin:0}button,input,select{font:inherit}button{cursor:pointer}@media(prefers-reduced-motion:no-preference){button.pressable:active:not(:disabled):not([aria-disabled=true]){filter:brightness(.96);transform:scale(.985);transition:transform .08s ease,filter .08s ease}}@media(prefers-reduced-motion:reduce){button.pressable:active:not(:disabled){transform:none;transition:none}}a{color:var(--accent)}.hanzi{font-family:Noto Sans SC,Source Han Sans SC,PingFang SC,Microsoft YaHei,sans-serif}kbd{display:inline-block;padding:.1em .35em;font-family:ui-monospace,Cascadia Code,Source Code Pro,Menlo,monospace;font-size:.9em;line-height:1.2;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:4px;box-shadow:0 1px 0 var(--border)}@media(max-width:768px),(pointer:coarse),(max-height:720px){:root{--layout-mobile-top-bar-height: calc(3rem + var(--safe-top));--flashcard-status-toolbar-height: calc(3.65rem + var(--safe-bottom));--study-session-options-height: calc(4.75rem + var(--safe-bottom));--study-session-options-bar-height: 4.75rem;--flashcard-session-active-bottom-padding: 0px}}