:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media (prefers-color-scheme:dark){:root{--text:#9ca3af;--text-h:#f3f4f6;--bg:#16171d;--border:#2e303a;--code-bg:#1f2028;--accent:#c084fc;--accent-bg:#c084fc26;--accent-border:#c084fc80;--social-bg:#2f303a80;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}#social .button-icon{filter:invert()brightness(2)}}#root{box-sizing:border-box;flex-direction:column;width:100%;max-width:560px;min-height:100svh;margin:0 auto;display:flex}body{margin:0}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-.5px;margin:0 0 16px;font-size:28px}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:18px;line-height:118%}p{margin:0}button{font:inherit}code{font-family:var(--mono);color:var(--text-h);background:var(--code-bg);border-radius:4px;padding:4px 8px;font-size:15px;line-height:135%;display:inline-flex}.app-shell{flex-direction:column;width:100%;min-height:100svh;display:flex}.app-loading{min-height:100svh;color:var(--text);justify-content:center;align-items:center;display:flex}.app-content{padding:20px 16px calc(16px + env(safe-area-inset-bottom));padding-bottom:calc(84px + env(safe-area-inset-bottom));flex:1;overflow-y:auto}.screen{text-align:left;flex-direction:column;gap:16px;display:flex}.hint{color:var(--text);font-size:14px}.bottom-nav{border-top:1px solid var(--border);background:var(--bg);padding:6px 4px calc(6px + env(safe-area-inset-bottom));justify-content:space-around;max-width:560px;margin:0 auto;display:flex;position:fixed;bottom:0;left:0;right:0}.bottom-nav__item{color:var(--text);cursor:pointer;background:0 0;border:none;flex-direction:column;flex:1;align-items:center;gap:2px;padding:6px 4px;font-size:11px;display:flex}.bottom-nav__item.active{color:var(--accent)}.bottom-nav__icon{font-size:20px;line-height:1}.language-picker{flex-wrap:wrap;gap:8px;display:flex}.language-pill{border:1px solid var(--border);background:var(--code-bg);color:var(--text-h);cursor:pointer;border-radius:999px;padding:8px 16px;font-size:14px}.language-pill.active{border-color:var(--accent-border);background:var(--accent-bg);color:var(--accent)}.chat-screen{gap:12px}.chat-messages{flex-direction:column;gap:10px;max-height:55vh;padding-right:2px;display:flex;overflow-y:auto}.bubble-row{flex-direction:column;max-width:85%;display:flex}.bubble-row--user{align-self:flex-end;align-items:flex-end}.bubble-row--assistant{align-self:flex-start;align-items:flex-start}.bubble{white-space:pre-wrap;border-radius:14px;padding:10px 14px;font-size:15px;line-height:140%}.bubble--user{background:var(--accent);color:#fff;border-bottom-right-radius:4px}.bubble--assistant{background:var(--code-bg);color:var(--text-h);border-bottom-left-radius:4px}.bubble__typing{opacity:.5}.corrections{flex-direction:column;gap:4px;max-width:100%;margin-top:4px;display:flex}.correction{background:var(--accent-bg);border:1px solid var(--accent-border);border-radius:8px;padding:6px 10px;font-size:13px}.correction__diff{font-weight:600}.correction__original{opacity:.7;text-decoration:line-through}.correction__corrected{color:var(--accent)}.correction__explanation{color:var(--text);margin-top:2px}.chat-input{align-items:flex-end;gap:8px;display:flex}.chat-input textarea{resize:none;border:1px solid var(--border);background:var(--bg);color:var(--text-h);border-radius:10px;flex:1;max-height:120px;padding:10px 12px;font-family:inherit;font-size:15px}.chat-input button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:10px 16px;font-size:14px}.chat-input button:disabled{opacity:.5;cursor:not-allowed}.error{color:#dc2626;font-size:13px}.correction__save{border:1px solid var(--accent-border);color:var(--accent);cursor:pointer;background:0 0;border-radius:6px;margin-top:6px;padding:4px 8px;font-size:12px}.correction__save:disabled{opacity:.6;cursor:default;color:var(--text);border-color:var(--border)}.vocab-form{border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:8px;padding:12px;display:flex}.vocab-form input{border:1px solid var(--border);background:var(--bg);color:var(--text-h);border-radius:8px;padding:8px 10px;font-size:14px}.vocab-form button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;align-self:flex-start;padding:8px 16px;font-size:14px}.vocab-form button:disabled{opacity:.5;cursor:not-allowed}.vocab-list{flex-direction:column;gap:8px;display:flex}.vocab-item{border:1px solid var(--border);border-radius:10px;justify-content:space-between;align-items:center;gap:8px;padding:10px 12px;display:flex}.vocab-item__term{color:var(--text-h);font-weight:600}.vocab-item__reading{color:var(--text);font-weight:400}.vocab-item__meaning{color:var(--text);font-size:14px}.vocab-item__meta{flex-shrink:0;align-items:center;gap:8px;display:flex}.vocab-item__box{color:var(--text);background:var(--code-bg);border-radius:999px;padding:2px 8px;font-size:11px}.vocab-item__delete{color:var(--text);cursor:pointer;background:0 0;border:none;padding:2px 6px;font-size:18px;line-height:1}.flashcard{border:1px solid var(--border);background:var(--code-bg);cursor:pointer;border-radius:16px;flex-direction:column;justify-content:center;align-items:center;gap:8px;width:100%;min-height:180px;padding:24px;display:flex}.flashcard:disabled{cursor:default}.flashcard__term{color:var(--text-h);text-align:center;font-size:26px;font-weight:600}.flashcard__reading{color:var(--text);font-size:15px}.flashcard__meaning{color:var(--accent);text-align:center;margin-top:8px;font-size:18px}.flashcard__hint{color:var(--text);margin-top:8px;font-size:13px}.review-actions{gap:10px;display:flex}.review-actions button{cursor:pointer;border:none;border-radius:10px;flex:1;padding:12px;font-size:15px}.review-actions__miss{background:var(--code-bg);color:var(--text-h);border:1px solid var(--border)}.review-actions__hit{background:var(--accent);color:#fff}.stats-grid{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.stat-tile{border:1px solid var(--border);text-align:center;border-radius:12px;flex-direction:column;align-items:center;gap:4px;padding:16px 8px;display:flex}.stat-tile__value{color:var(--accent);font-size:26px;font-weight:700}.stat-tile__label{color:var(--text);font-size:12px}