:root{color-scheme:light;--er-bg: #eef3ef;--er-bg-accent: #d7e4da;--er-ink: #14241c;--er-muted: #4a6356;--er-brand: #1a3a2f;--er-brand-soft: #2d5a48;--er-line: #b7c9be;--er-panel: rgba(255, 255, 255, .82);--er-danger: #8b2e2e;--er-focus: #0e7c66;--er-font-display: "Source Serif 4", "Songti SC", "Noto Serif SC", Georgia, serif;--er-font-body: "IBM Plex Sans", "PingFang SC", "Noto Sans SC", system-ui, sans-serif;--er-radius: 12px;--er-shadow: 0 10px 30px rgba(20, 36, 28, .08)}*{box-sizing:border-box}html,body,#root{min-height:100%}body{margin:0;font-family:var(--er-font-body);color:var(--er-ink);background:radial-gradient(1200px 600px at 10% -10%,#cfe0d4 0%,transparent 55%),radial-gradient(900px 500px at 100% 0%,#f0e6d4 0%,transparent 45%),linear-gradient(180deg,var(--er-bg),#f7faf8 40%,var(--er-bg-accent));background-attachment:fixed}a{color:var(--er-brand-soft)}h1,h2,h3{font-family:var(--er-font-display);font-weight:650;letter-spacing:-.02em}button,input,textarea,select{font:inherit}button{cursor:pointer;border:1px solid var(--er-line);background:#fff;color:var(--er-ink);border-radius:10px;padding:.55rem .9rem}button.primary{background:var(--er-brand);border-color:var(--er-brand);color:#f4faf7}button:disabled{opacity:.55;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--er-focus);outline-offset:2px}.auth-field{gap:.35rem}.auth-field input{width:100%;min-height:44px;padding:.65rem .75rem;color:var(--er-ink);background:#fff;border:1px solid var(--er-line);border-radius:10px}.app-shell{max-width:720px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column;padding:0 1rem 5.5rem}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding:.85rem 0;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:color-mix(in srgb,var(--er-bg) 70%,transparent)}.brand{font-family:var(--er-font-display);font-size:1.35rem;color:var(--er-brand);text-decoration:none}.muted{color:var(--er-muted);font-size:.92rem}.banner{border:1px solid var(--er-line);background:var(--er-panel);border-radius:var(--er-radius);padding:.75rem 1rem;margin-bottom:.75rem;box-shadow:var(--er-shadow)}.banner.warn{border-color:#c9a66b;background:#fff8ea}.banner.danger{border-color:#d8a0a0;background:#fff1f1;color:var(--er-danger)}.panel{border:1px solid var(--er-line);background:var(--er-panel);border-radius:var(--er-radius);padding:1rem;box-shadow:var(--er-shadow)}.stack{display:flex;flex-direction:column;gap:.75rem}.row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}.bottom-nav{position:fixed;left:0;right:0;bottom:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.25rem;padding:.5rem .5rem calc(.5rem + env(safe-area-inset-bottom));background:#ffffffeb;border-top:1px solid var(--er-line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.app-shell.immersive-shell{max-width:none;padding:0;background:transparent}.immersive-shell main{flex:1;width:100%}.reader-experience{--reader-paper: #f8f2e7;--reader-paper-deep: #eee4d4;--reader-text: #27251f;--reader-soft-text: #756e62;--reader-accent: #55705d;--reader-highlight: #e3d7aa;min-height:100dvh;color:var(--reader-text);background:radial-gradient(circle at 20% 0%,rgba(255,255,255,.7),transparent 34rem),var(--reader-paper);transition:color .18s ease,background .18s ease}.reader-theme-night{--reader-paper: #171a18;--reader-paper-deep: #222724;--reader-text: #e7e1d5;--reader-soft-text: #aaa398;--reader-accent: #9fb6a5;--reader-highlight: #504c36;color-scheme:dark;background:radial-gradient(circle at 20% 0%,rgba(75,84,78,.28),transparent 34rem),var(--reader-paper)}.reader-toolbar{position:sticky;top:0;z-index:12;display:grid;grid-template-columns:44px 1fr 44px;align-items:center;gap:.75rem;min-height:64px;padding:max(.5rem,env(safe-area-inset-top)) max(1rem,calc((100vw - 760px)/2));color:var(--reader-text);background:color-mix(in srgb,var(--reader-paper) 88%,transparent);border-bottom:1px solid color-mix(in srgb,var(--reader-text) 10%,transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.reader-toolbar-title{display:flex;flex-direction:column;min-width:0;text-align:center}.reader-toolbar-title strong{font-family:var(--er-font-display);font-size:.98rem;font-weight:650}.reader-toolbar-title span{color:var(--reader-soft-text);font-size:.72rem}.reader-icon-button{display:inline-grid;place-items:center;width:42px;min-width:42px;height:42px;padding:0;color:inherit;background:transparent;border:0;border-radius:50%;text-decoration:none}.reader-icon-button:hover{background:color-mix(in srgb,var(--reader-text) 8%,transparent)}.ebook-page{width:min(100%,760px);min-height:calc(100dvh - 64px);margin:0 auto;padding:clamp(2.2rem,7vw,5.5rem) clamp(1.35rem,6vw,4rem) 9rem;font-family:var(--er-font-display);font-size:var(--reader-font-size);line-height:var(--reader-line-height);letter-spacing:.005em}.reader-page-nav{display:flex;align-items:center;justify-content:space-between;gap:.75rem;width:min(100%,760px);margin:0 auto;padding:.8rem clamp(1.35rem,6vw,4rem) 0;color:var(--reader-soft-text);font-size:.82rem}.reader-page-button{padding:.45rem .75rem;color:var(--reader-text);background:color-mix(in srgb,var(--reader-text) 8%,transparent);border:1px solid color-mix(in srgb,var(--reader-text) 14%,transparent);border-radius:999px}.reader-page-button:disabled{cursor:not-allowed;opacity:.4}.ebook-paragraph{margin:0 0 1.65em;text-wrap:pretty}.ebook-sentence{display:inline;margin:0;padding:.08em .09em;color:inherit;font:inherit;line-height:inherit;text-align:left;background:transparent;border:0;border-radius:.28em;cursor:text;transition:background .15s ease,box-shadow .15s ease}.ebook-sentence:hover{background:color-mix(in srgb,var(--reader-highlight) 45%,transparent)}.ebook-sentence.is-reading{background:var(--reader-highlight);box-shadow:0 0 0 .18em var(--reader-highlight)}.reader-control-dock{position:fixed;z-index:18;left:50%;bottom:max(1rem,env(safe-area-inset-bottom));display:flex;align-items:center;gap:.8rem;width:max-content;max-width:calc(100vw - 2rem);padding:.55rem .7rem;transform:translate(-50%);color:var(--reader-text);background:color-mix(in srgb,var(--reader-paper-deep) 90%,transparent);border:1px solid color-mix(in srgb,var(--reader-text) 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color-mix(in srgb,var(--reader-text) 12%,transparent);border-bottom:0;border-radius:24px 24px 0 0;box-shadow:0 -18px 60px #0f121040}.reader-sheet-tall{height:min(90dvh,760px);max-height:90dvh}.reader-sheet-handle{width:42px;height:4px;margin:.65rem auto 0;background:color-mix(in srgb,var(--reader-text) 20%,transparent);border-radius:999px}.reader-sheet-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 1.25rem .8rem;border-bottom:1px solid color-mix(in srgb,var(--reader-text) 9%,transparent)}.reader-sheet-header h2{min-width:0;margin:0;overflow:hidden;font-size:1.18rem;text-overflow:ellipsis;white-space:nowrap}.reader-sheet-header button{flex:none;color:var(--reader-soft-text);background:transparent;border:0}.reader-sheet-body{display:flex;flex-direction:column;gap:1.15rem;max-height:calc(76dvh - 76px);padding:1.25rem 1.25rem max(1.4rem,env(safe-area-inset-bottom));overflow:auto}.reader-sheet-tall .reader-sheet-body{height:calc(100% - 76px);max-height:none}.sentence-sheet-copy{font-family:var(--er-font-display);font-size:clamp(1.35rem,5vw,1.8rem);line-height:1.75}.sentence-word{display:inline;margin:0;padding:0 .04em;color:inherit;font:inherit;line-height:inherit;background:transparent;border:0;border-bottom:1px dotted color-mix(in srgb,var(--reader-accent) 55%,transparent);border-radius:3px}.sentence-word:hover,.sentence-word:focus-visible{background:color-mix(in srgb,var(--reader-highlight) 70%,transparent)}.sentence-translation{padding-top:1rem;color:var(--reader-soft-text);font-size:1rem;line-height:1.75;border-top:1px solid color-mix(in srgb,var(--reader-text) 9%,transparent)}.reader-sheet-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.7rem}.reader-sheet-actions button{min-height:48px;color:var(--reader-text);background:var(--reader-paper-deep);border-color:color-mix(in srgb,var(--reader-text) 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1rem;background:var(--reader-paper-deep);border-radius:14px}.chat-context span{color:var(--reader-soft-text);font-size:.72rem}.chat-context p{margin:.35rem 0 0;font-family:var(--er-font-display);line-height:1.5}.reader-chat-log{display:flex;flex:1;flex-direction:column;gap:.75rem;min-height:10rem;overflow-y:auto}.chat-welcome{color:var(--reader-soft-text);line-height:1.6}.chat-suggestions{display:flex;flex-wrap:wrap;gap:.5rem}.chat-suggestions button{color:var(--reader-text);background:transparent;border-color:color-mix(in srgb,var(--reader-text) 14%,transparent);border-radius:999px}.chat-message{max-width:88%;padding:.75rem .9rem;line-height:1.65;border-radius:15px;white-space:pre-wrap}.chat-user{align-self:flex-end;background:var(--reader-highlight)}.chat-assistant{align-self:flex-start;background:var(--reader-paper-deep)}.reader-chat-composer{display:grid;grid-template-columns:1fr auto;align-items:end;gap:.6rem;flex:none}.reader-chat-composer textarea{width:100%;resize:none;padding:.75rem .85rem;color:var(--reader-text);background:var(--reader-paper-deep);border:1px solid color-mix(in srgb,var(--reader-text) 15%,transparent);border-radius:14px}.reader-setting{display:grid;grid-template-columns:5rem 1fr;align-items:center;gap:1rem}.reader-setting>span{color:var(--reader-soft-text)}.reader-setting input{width:100%;accent-color:var(--reader-accent)}.reader-choice-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.5rem}.reader-choice-row button{color:var(--reader-text);background:transparent;border-color:color-mix(in srgb,var(--reader-text) 15%,transparent)}.reader-choice-row button.is-selected{color:#fff;background:var(--reader-accent);border-color:var(--reader-accent)}.reader-loading,.reader-empty{display:grid;place-content:center;gap:1rem;min-height:100dvh;padding:2rem;text-align:center}.reader-empty p{margin:0;color:var(--er-muted)}.reader-primary-link{display:inline-block;padding:.65rem 1rem;border-radius:10px;text-decoration:none}@media(min-width:800px){.reader-sheet-backdrop{align-items:center;padding:2rem}.reader-sheet{border-bottom:1px solid color-mix(in srgb,var(--reader-text) 12%,transparent);border-radius:24px}}@media(prefers-reduced-motion:reduce){.ebook-sentence,.reader-experience{transition:none}}.bottom-nav a{text-decoration:none;color:var(--er-muted);text-align:center;font-size:.78rem;padding:.4rem .2rem;border-radius:10px}.bottom-nav a.active{color:var(--er-brand);background:#e4efe8;font-weight:600}.reader-doc{font-family:var(--er-font-display);font-size:1.2rem;line-height:1.75}.sentence{margin:0 0 1rem}.sentence .zh{display:block;margin-top:.35rem;font-family:var(--er-font-body);font-size:.98rem;color:var(--er-muted)}.token{border:0;background:transparent;padding:0 .05em;border-radius:4px;font:inherit;color:inherit}.token:hover,.token[aria-pressed=true]{background:#cfe8d8}.token.punct{pointer-events:none}.sheet{position:fixed;left:0;right:0;bottom:0;max-height:55dvh;overflow:auto;z-index:30;border-radius:16px 16px 0 0;border:1px solid var(--er-line);background:#fff;padding:1rem 1rem calc(1rem + env(safe-area-inset-bottom));box-shadow:0 -12px 40px #14241c2e}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.list{list-style:none;margin:0;padding:0}.list li{padding:.85rem 0;border-bottom:1px solid var(--er-line)}@media(min-width:860px){.app-shell{max-width:880px}.reader-doc.bilingual-wide .sentence{display:grid;grid-template-columns:1fr 1fr;gap:1rem}}