:root{--background: #f4f6f3;--surface: #ffffff;--text: #202422;--text-secondary: #6b716d;--primary: #145c43;--primary-strong: #0f4b36;--primary-soft: #e7f2ec;--correct: #2e7d5b;--correct-soft: #e9f4ee;--wrong: #b45a5a;--wrong-soft: #f8ecec;--border: #dce3de;--muted: #aeb7b1;--shadow: 0 12px 34px rgba(25, 53, 40, .075);--shadow-soft: 0 5px 16px rgba(25, 53, 40, .055);font-family:Pretendard,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:var(--background);font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{min-width:320px;overflow-x:hidden;background:radial-gradient(circle at 50% 0,rgba(20,92,67,.07),transparent 34%),#e9eeea}button{font:inherit}button:focus-visible{outline:3px solid rgba(20,92,67,.28);outline-offset:2px}button:disabled{cursor:default}.app-shell{position:relative;width:100%;max-width:540px;min-height:100dvh;margin:0 auto;background:var(--background);box-shadow:0 0 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4px;font-size:13px}.bottom-tabs{position:fixed;z-index:20;right:0;bottom:0;left:0;display:grid;grid-template-columns:repeat(4,1fr);width:100%;max-width:540px;margin:auto;padding:9px 10px calc(9px + env(safe-area-inset-bottom));border-top:1px solid var(--border);background:#fffffff0;box-shadow:0 -8px 24px #1935280b;backdrop-filter:blur(16px)}.tab-button{display:flex;min-height:48px;flex-direction:column;align-items:center;justify-content:center;gap:2px;border:0;border-radius:14px;color:var(--muted);background:transparent;cursor:pointer;font-size:11px;font-weight:700}.tab-button span:first-child{font-size:17px}.tab-button.is-active{color:var(--primary);background:var(--primary-soft)}.quiz-screen{display:flex;flex-direction:column;padding-bottom:calc(28px + env(safe-area-inset-bottom))}.quiz-status{display:grid;grid-template-columns:42px minmax(0,1fr) 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rgba(255,255,255,.72);border-radius:22px;background:#fff;box-shadow:0 24px 70px #101f173d;text-align:center}.dialog-mark{display:grid;width:42px;height:42px;margin:0 auto 15px;place-items:center;border-radius:50%;color:var(--primary);background:var(--primary-soft);font-size:20px;font-weight:850}.dialog-mark.is-danger{color:var(--wrong);background:var(--wrong-soft)}.confirm-dialog h2{margin-bottom:9px;font-size:19px}.confirm-dialog p{margin-bottom:22px;color:var(--text-secondary);font-size:14px;line-height:1.6}.dialog-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}.dialog-actions button{min-height:48px;border-radius:13px;cursor:pointer;font-weight:750}.dialog-cancel{border:1px solid var(--border);color:var(--text-secondary);background:#fff}.dialog-confirm{border:1px solid var(--primary);color:#fff;background:var(--primary)}.dialog-confirm.is-danger{border-color:var(--wrong);background:var(--wrong)}.update-notice{position:fixed;z-index:40;top:calc(10px + 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