:root{--bg: #f4efe6;--paper: #fffaf3;--ink: #2a241c;--muted: #7a6f63;--line: #e6dccb;--brand: #e06b4f;--brand-dark: #c45339;--ok: #2f9e6b;--bad: #d64545;--locked: #c9c0b4;--shadow: 0 10px 30px rgba(80, 52, 32, .08);font-family:PingFang SC,Hiragino Sans GB,Noto Sans SC,Noto Sans JP,sans-serif;color:var(--ink);background:var(--bg);line-height:1.4}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{background:radial-gradient(circle at top,#fff8ee,transparent 42%),var(--bg)}button,a{font:inherit}.app-shell{width:min(430px,100%);min-height:100dvh;margin:0 auto;padding:16px 16px 28px;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.ghost-link,.ghost-btn{border:0;background:transparent;color:var(--muted);text-decoration:none;padding:8px 0}.page-title{margin:0;font-size:22px}.page-sub{margin:6px 0 0;color:var(--muted);font-size:14px}.card{background:var(--paper);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.stack{display:flex;flex-direction:column;gap:12px}.primary-btn,.secondary-btn,.option-btn{width:100%;min-height:52px;border-radius:16px;border:0;padding:12px 16px;cursor:pointer}.primary-btn{background:var(--brand);color:#fff;font-weight:700}.primary-btn:disabled{opacity:.45;cursor:not-allowed}.secondary-btn{background:#efe6d8;color:var(--ink)}.option-btn{background:var(--paper);border:2px solid var(--line);text-align:left;font-size:22px;overflow-wrap:anywhere;word-break:break-word}.option-btn small{display:block;color:var(--muted);font-size:13px;margin-top:4px}.option-btn.correct{border-color:var(--ok);background:#e8f7ef}.option-btn.wrong{border-color:var(--bad);background:#fdecec}.hero{padding:28px 20px 22px;margin-bottom:16px}.hero h1{margin:0 0 8px;font-size:28px}.unit{padding:16px}.unit h2{margin:0;font-size:18px}.lesson-grid{display:grid;gap:10px;margin-top:12px}.lesson-btn{display:flex;align-items:center;justify-content:space-between;width:100%;min-height:58px;padding:12px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;text-align:left;text-decoration:none;color:inherit}.lesson-btn.locked{background:#f3eee6;color:var(--locked)}.stars{letter-spacing:2px;color:#e0a12b}.flash-card{min-height:320px;padding:28px 20px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;cursor:pointer}.flash-jp{font-size:clamp(64px,22vw,96px);line-height:1;font-weight:700}.flash-jp.sentence{font-size:clamp(22px,6vw,32px);line-height:1.35;word-break:break-word}.flash-tip{margin-top:12px;padding:10px 12px;background:#fff3e6;border-radius:12px;font-size:14px;color:var(--ink)}.dialogue-thread{display:flex;flex-direction:column;gap:10px}.bubble{max-width:min(86%,360px);padding:14px 16px;border-radius:18px;border:0;text-align:left;cursor:pointer;word-break:break-word;overflow-wrap:anywhere}.bubble.me{align-self:flex-end;background:var(--brand);color:#fff}.bubble.other{align-self:flex-start;background:#efe6d8;color:var(--ink)}.bubble-jp{font-size:20px;font-weight:700;margin-top:4px}.bubble-meta{font-size:13px;opacity:.88;margin-top:6px}.bubble.me .bubble-meta{color:#ffe9e2}.bubble.playing{outline:2px solid var(--brand-dark);outline-offset:2px}.flash-meta{margin-top:16px;color:var(--muted)}.progress-bar{height:8px;background:#eadfce;border-radius:99px;overflow:hidden}.progress-bar>span{display:block;height:100%;background:var(--brand)}.board{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.match-card{min-height:92px;border-radius:16px;border:2px solid var(--line);background:#fff;font-size:28px;cursor:pointer}.match-card.face{background:#fff7ea}.match-card.matched{opacity:.45;border-color:var(--ok)}.match-card.selected{border-color:var(--brand)}.match-card.long{font-size:15px;line-height:1.3;padding:8px}.hint{color:var(--muted);font-size:14px;text-align:center}.result-stars{font-size:42px;text-align:center;margin:8px 0 16px;color:#e0a12b}.emoji{font-size:42px}