:root{--desk: #e9e5dc;--paper: #fffefb;--ink: #23211c;--ink-soft: #5f5a50;--muted: #8a8478;--line: rgba(35, 33, 28, .12);--line-strong: rgba(35, 33, 28, .22);--accent: #a8492a;--accent-ink: #8c3a1f;--accent-soft: rgba(168, 73, 42, .11);--green: #3c7a52;--red: #b3261e;--ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;--serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;--mono: ui-monospace, SFMono-Regular, Menlo, monospace;--toolbar: rgba(255, 253, 248, .92);--shadow-card: 0 1px 2px rgba(40, 32, 20, .06), 0 14px 30px -22px rgba(40, 32, 20, .45);--shadow-page: 0 1px 2px rgba(40, 32, 20, .18), 0 30px 60px -30px rgba(40, 32, 20, .45)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;color:var(--ink);font-family:var(--ui);font-size:14px;-webkit-font-smoothing:antialiased;background:radial-gradient(120% 90% at 50% -10%,#f3f0e9 0%,var(--desk) 48%,#e3ded3 100%) 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var(--line);border-radius:12px;background:var(--paper);box-shadow:0 24px 50px -20px #28201480}.menu button{padding:9px 10px;border:none;border-radius:7px;background:none;font-size:13px;text-align:left;cursor:pointer}.menu button:hover{background:#23211c0f}.menu button.danger{color:var(--red)}.menu hr{margin:4px 6px;border:none;border-top:1px solid var(--line)}.lesson-main{position:relative;display:flex;flex:1;min-height:0}.rail{display:flex;z-index:5;flex:none;flex-direction:column;align-items:center;gap:8px;width:100px;padding:10px 8px 24px;overflow-x:hidden;overflow-y:auto;border-right:1px solid var(--line);background:#fffdf86b;scrollbar-width:none}.rail::-webkit-scrollbar{display:none}.rail-page{display:flex;flex-direction:column;align-items:center;gap:3px;padding:3px;border:none;border-radius:7px;background:none;opacity:.65;cursor:pointer;transition:opacity .15s}.rail-page:hover{opacity:1}.rail-page.active{border-radius:7px;background:var(--accent-soft);outline:1px solid 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svg{width:16px;height:16px}.eraser-ring{position:absolute;top:0;left:0;z-index:8;width:28px;height:28px;margin:-14px 0 0 -14px;border:1.5px solid rgba(35,33,28,.5);border-radius:50%;background:#ffffff73;opacity:0;pointer-events:none;transition:opacity .1s}.eraser-ring.on{opacity:1}.stage-hud{position:absolute;z-index:12;display:flex;align-items:center;border:1px solid var(--line);border-radius:999px;background:var(--toolbar);box-shadow:0 10px 24px -16px #28201480;backdrop-filter:blur(10px)}.zoom-hud{right:12px;bottom:12px;padding:2px}.zoom-hud button{display:grid;place-items:center;width:32px;height:32px;border:none;border-radius:999px;background:none;color:var(--ink-soft);cursor:pointer}.zoom-hud button:hover{background:#23211c0f}.zoom-hud svg{width:17px;height:17px}.zoom-label{min-width:42px;color:var(--muted);font-family:var(--mono);font-size:10.5px;text-align:center}.page-nav{position:absolute;top:50%;z-index:12;display:grid;place-items:center;width:40px;height:40px;border:1px solid var(--line);border-radius:50%;background:#fffdf8e0;box-shadow:0 6px 16px -10px #0006;color:var(--ink-soft);cursor:pointer;opacity:.5;transform:translateY(-50%);transition:opacity .15s}.page-nav:hover{opacity:1}.page-nav.left{left:12px}.page-nav.right{right:12px}.page-nav:disabled{opacity:0;pointer-events:none}.stage-loading{position:absolute;top:50%;left:50%;color:var(--muted);font-size:13px;transform:translate(-50%,-50%)}.stage-hint{position:absolute;bottom:16px;left:50%;z-index:14;max-width:90%;padding:7px 14px;border-radius:999px;background:#23211cde;box-shadow:0 10px 24px -12px #00000080;color:#fffdf7;font-size:11.5px;text-align:center;pointer-events:none;transform:translate(-50%)}.speech-chip{position:absolute;bottom:14px;left:50%;z-index:22;display:flex;align-items:center;gap:10px;width:min(560px,calc(100% - 24px));padding:8px 8px 8px 12px;border:1px solid var(--line);border-radius:14px;background:#fffdf8f7;box-shadow:0 18px 40px -22px #28201480;transform:translate(-50%);backdrop-filter:blur(10px)}.speech-chip>svg{flex:none;width:20px;height:20px;color:var(--accent)}.speech-chip.error{border-color:#e9c4ba}.speech-copy{flex:1;min-width:0}.speech-text{overflow:hidden;color:var(--ink);font-size:12.5px;line-height:1.4;text-overflow:ellipsis;white-space:nowrap}.speech-error{margin-top:2px;color:var(--red);font-size:11px;line-height:1.3}.speech-btn{display:grid;flex:none;place-items:center;width:32px;height:32px;border:none;border-radius:50%;background:var(--accent-soft);color:var(--accent-ink);cursor:pointer}.speech-btn.close{background:transparent;color:var(--muted)}.speech-btn svg{width:16px;height:16px}.speech-spinner{flex:none;width:16px;height:16px;margin:0 8px;border:2px solid var(--line-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}.history-tools{display:flex;flex:none;gap:2px}.tool:disabled{opacity:.28;background:none;cursor:default}.toolbar-wrap{display:flex;flex:none;align-items:center;justify-content:center;padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:linear-gradient(180deg,rgba(233,229,220,0) 0%,var(--desk) 42%)}.toolbar{display:flex;align-items:center;gap:6px;max-width:100%;overflow-x:auto;padding:5px;border:1px solid var(--line);border-radius:16px;background:var(--toolbar);box-shadow:0 18px 40px -22px #2820148c,0 1px 2px #2820140f;backdrop-filter:blur(14px);scrollbar-width:none}.toolbar::-webkit-scrollbar{display:none}.tool-group{display:flex;gap:2px}.tool{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;width:46px;height:46px;border:none;border-radius:11px;background:transparent;color:var(--ink-soft);cursor:pointer}.tool svg{width:21px;height:21px}.tool-label{color:var(--muted);font-size:8.5px;letter-spacing:.02em}.tool.active{background:var(--accent-soft);color:var(--accent-ink)}.tool.active .tool-label{color:var(--accent-ink)}.toolbar-sep{flex:none;width:1px;height:28px;margin:0 2px;background:var(--line)}.palette{display:flex;gap:7px;padding:0 4px}.swatch{position:relative;width:24px;height:24px;padding:0;border:1px solid rgba(35,33,28,.18);border-radius:50%;cursor:pointer;transition:transform .12s}.swatch.active{box-shadow:0 0 0 2px var(--toolbar),0 0 0 4px var(--accent);transform:scale(1.04)}.widths{display:flex;gap:2px;padding:0 2px}.width{display:grid;place-items:center;width:30px;height:34px;border:none;border-radius:8px;background:transparent;cursor:pointer}.width span{display:block;border-radius:99px;background:var(--ink-soft)}.width.active{background:var(--accent-soft)}.width.active span{background:var(--accent-ink)}.center-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;height:100dvh;padding:24px;text-align:center}.muted{color:var(--muted);font-size:13.5px}.error-text{max-width:420px;color:var(--red);font-size:14px}.spinner{width:26px;height:26px;border:2px solid var(--line-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(hover:hover){.lesson-card:hover{border-color:var(--line-strong);box-shadow:0 20px 40px -24px #28201480;transform:translateY(-2px)}.continue-card:hover{border-color:var(--line-strong)}.brand-mark,.btn{transition:background .15s}.btn.primary:hover{background:#37332b}}@media(max-width:900px){.rail{display:none}.lesson-title{max-width:34vw}.save-label{display:none}.save-badge{padding:7px}.tool{width:44px;height:44px}.tool-label{display:none}}@media(max-width:980px){.auth-screen{align-items:flex-start;padding-top:32px}.auth-layout{grid-template-columns:1fr;gap:26px;max-width:540px}.auth-card{justify-self:stretch;max-width:none}.auth-headline{font-size:30px}}@media(max-width:700px){.account-email{display:none}.account-menu{width:min(320px,calc(100vw - 32px))}.library-actions{gap:8px}}@media(max-width:600px){.library-head{align-items:flex-start;flex-wrap:wrap}.library-actions{width:100%;justify-content:space-between}.auth-card{padding:22px}.auth-headline{font-size:26px}.auth-lead{font-size:14px}.brand p{display:none}.library h1{font-size:24px}.continue-card{gap:14px;padding:12px}.continue-thumb{width:84px}.continue-copy h2{font-size:18px}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}.pager,.lesson-sub{display:none}.toolbar{gap:2px}.toolbar-sep{display:none}.tool{width:40px;height:40px}.tool svg{width:19px;height:19px}.toolbar-wrap{padding-right:6px;padding-left:6px}.swatch{width:22px;height:22px}.stage-hint{bottom:12px;font-size:11px;white-space:normal}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}}