:root{--bg: #f6f7fb;--surface: #ffffff;--text: #1b1f2a;--muted: #5b6475;--border: #d9dde8;--primary: #2b5fd9;--primary-text: #ffffff;--good: #1f7a45;--warn: #a35b00;--bad: #b3261e;--new-bg: #e6edff;--learning-bg: #fff1d6;--review-bg: #dcf3e4;--hard: #fde8e6;--good-bg: #fff1d6;--easy: #dcf3e4;--focus: #1a46b0;--tabbar-h: 56px}@media(prefers-color-scheme:dark){:root{--bg: #12151c;--surface: #1c212c;--text: #eceff6;--muted: #a3acbf;--border: #343b4d;--primary: #6b92f5;--primary-text: #0c1220;--good: #6fd29a;--warn: #f0b45c;--bad: #ff8a80;--new-bg: #22305a;--learning-bg: #4a3a16;--review-bg: #1d4030;--hard: #4a2623;--good-bg: #4a3a16;--easy: #1d4030;--focus: #9db8ff}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-text-size-adjust:100%;overflow-x:hidden}.app{min-height:100vh;min-height:100dvh}.main{max-width:640px;margin:0 auto;padding:calc(16px + 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