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lab,red,red)){.reader-topbar__tools{box-shadow:0 18px 48px color-mix(in srgb,var(--reader-text) 16%,transparent)}}.reader-topbar__tools{-webkit-backdrop-filter:none;backdrop-filter:none}.drawer{top:calc(var(--reader-topbar-height,56px) + 10px);width:min(420px,100vw - 20px);bottom:10px;left:auto;right:10px}.tutor-rail{inset:auto 12px calc(var(--reader-bottom-chrome-base,86px) + 12px);border-radius:16px;width:auto;max-height:min(54dvh,520px);animation:reader-surface-enter .18s cubic-bezier(.16,1,.3,1)}.reader-note-composer{left:max(12px,env(safe-area-inset-left,0px));right:max(12px,env(safe-area-inset-right,0px));width:auto;bottom:calc(var(--reader-bottom-chrome-base,86px) + 12px);overscroll-behavior:contain;max-height:min(72dvh,560px);padding-bottom:calc(14px + env(safe-area-inset-bottom,0px));border-radius:18px;overflow:auto}.reader-note-composer[data-anchored=false]{visibility:visible;pointer-events:auto}.reader-note-composer__scrim{background:#080a1052}.reader-note-composer__handle{background:#f7fbff5c;border-radius:999px;width:42px;height:4px;margin:0 auto 10px;display:block}}@media (max-width:640px){.reader-topbar{gap:6px;padding-inline:8px}.reader-topbar__brand{flex:auto;gap:6px}.reader-topbar__logo{--whisperleaf-logo-size:32px}.reader-topbar__logo-button,.reader-topbar__menu-btn,.reader-topbar__navigation-control{width:42px;min-width:42px;height:42px;min-height:42px}.reader-topbar__copy{flex:auto;min-width:0}.reader-topbar__copy strong{max-width:none;font-size:13px}.reader-topbar__tools{inset:auto 8px calc(8px + env(safe-area-inset-bottom,0px));border-radius:16px;min-width:0;max-height:min(70dvh,520px);animation:reader-surface-enter .18s cubic-bezier(.16,1,.3,1);position:fixed}.drawer{width:100%;max-height:min(78dvh,680px);padding-bottom:env(safe-area-inset-bottom,0);border-width:1px 0 0;border-radius:18px 18px 0 0;inset:auto 0 0}.drawer__header{padding-inline:16px}.tutor-rail{inset-inline:0;bottom:var(--reader-bottom-chrome-base,86px);border-width:1px 0 0;border-radius:18px 18px 0 0;max-height:min(62dvh,540px)}.reader-page-footer__chapter{max-width:42vw}}@media (prefers-reduced-motion:reduce){.drawer,.reader-topbar__tools,.tutor-rail{animation:none}}.home-locale-switcher__menu--text{color:#1b1917;box-shadow:none;font-family:var(--font-inter),var(--font-noto-sans-sc),"PingFang SC","Microsoft YaHei",sans-serif;background:#fff;border:1px solid #1b19171a;border-radius:12px;padding:6px}.home-locale-switcher__menu--text .home-locale-switcher__option{color:#1b19179e;border-radius:8px;min-height:44px}.home-locale-switcher__menu--text .home-locale-switcher__option:focus-visible,.home-locale-switcher__menu--text .home-locale-switcher__option:hover,.home-locale-switcher__menu--text .home-locale-switcher__option[data-selected=true]{color:#1b1917;background:#26443a0f}.home-locale-switcher__menu--text .home-locale-switcher__option:focus-visible{outline-offset:2px;outline:2px solid #26443a}.home-locale-switcher__menu--text .home-locale-switcher__option-bar{background:#26443a}.companion-surface{min-width:0;height:100%;min-height:0}.reader-assist-dock__body--explain:has(.companion-surface){flex-direction:column;min-height:0;padding:0;display:flex;overflow:hidden}.reader-assist-dock__body--explain>.companion-surface{flex:1}.tutor-rail[data-companion=true]{height:76dvh;max-height:calc(100dvh - 128px - var(--reader-safe-area-top,0px) - env(safe-area-inset-bottom,0px));z-index:90;bottom:calc(64px + env(safe-area-inset-bottom,0px));flex-direction:column;padding:0;display:flex;overflow:hidden}.tutor-rail[data-companion=true] .tutor-rail__body{flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}.tutor-rail[data-companion=true] .tutor-rail__body>.companion-surface{flex:1}.tutor-rail[data-companion=true] .tutor-rail__body[hidden]{display:none}.tutor-rail[data-empty=true]{height:auto}.tutor-rail__idle{margin:0;padding:20px}.tutor-rail[data-companion=true][data-source-view=true]{height:auto;max-height:none;padding-bottom:0}.tutor-rail[data-companion=true][data-source-view=true] .tutor-rail__header{border-bottom:0}.tutor-rail__header-actions{align-items:center;gap:8px;display:flex}.tutor-rail[data-companion=true] .tutor-rail__source-toggle{white-space:nowrap;width:auto;color:var(--reader-text);border-radius:8px;padding:0 12px;font-size:13px;font-weight:600}.tutor-rail[data-companion=true] .tutor-rail__header{border-bottom:1px solid var(--reader-text);flex:none;min-height:52px;margin:0;padding:4px 20px}@supports (color:color-mix(in lab,red,red)){.tutor-rail[data-companion=true] .tutor-rail__header{border-bottom:1px solid color-mix(in srgb,var(--reader-text) 12%,transparent)}}.tutor-rail[data-companion=true] .tutor-rail__header{background:var(--surface-bg)}.reader-assist-dock__collapse,.tutor-rail[data-companion=true] .tutor-rail__header button{min-width:44px;min-height:44px}.tutor-rail[data-companion=true] .tutor-rail__surface-title{letter-spacing:.08em;font-size:13px}.tutor-rail[data-companion=true] :is(.tutor-rail__ai-unit,.tutor-rail__warning){flex:none}@media (min-width:1200px){.tutor-rail[data-companion=true]{height:min(76dvh,800px);max-height:76dvh}}@media (pointer:coarse){.reader-selection-action-bar:before{display:none}.reader-selection-action-bar{bottom:calc(var(--reader-bottom-chrome-base,calc(76px + env(safe-area-inset-bottom,0px))) + 12px);max-width:calc(100vw - 24px);position:fixed;transform:translate(-50%);top:auto!important;left:50%!important}.reader-selection-action-bar button{width:48px!important;min-width:48px!important;height:48px!important;min-height:48px!important}}@property --tw-scale-x{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-y{syntax:"*";inherits:false;initial-value:1}@property --tw-scale-z{syntax:"*";inherits:false;initial-value:1}@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-border-style{syntax:"*";inherits:false;initial-value:solid}@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 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@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-ease{syntax:"*";inherits:false}