:root{--bg: #f6f5ef;--fg: #1c1c1c;--muted: #6b6b6b;--tile-bg: #ffffff;--tile-border: #cfc8b6;--tile-shadow: 0 1px 0 rgba(0, 0, 0, .06);--tile-drop: #ffe9a0;--indicator-bg: #d8d4c4;--green: #6aaa64;--yellow: #c9b458;--neutral: #c0bba9;--accent: #4a7a3a;--button-bg: #1c1c1c;--button-fg: #f6f5ef}@media (prefers-color-scheme: dark){:root{--bg: #121213;--fg: #f5f5f5;--muted: #a0a0a0;--tile-bg: #2c2c2e;--tile-border: #3a3a3c;--tile-drop: #6c5a16;--indicator-bg: #3a3a3c;--green: #538d4e;--yellow: #b59f3b;--neutral: #565759;--button-bg: #f5f5f5;--button-fg: #121213}}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;min-height:100vh}body{display:flex;flex-direction:column;align-items:center;padding:24px 16px 60px}header{text-align:center;margin-bottom:20px;max-width:480px}h1{font-size:1.7rem;margin:0 0 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