:root{--bg: #f7f7f8;--surface: #ffffff;--border: #e2e2e6;--text: #1c1c1e;--muted: #6b6b73;--accent: #2f6fed;--danger: #c0392b;--radius: 10px;--mine: #12b886;--mine-text: #ffffff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Hiragino Sans,Noto Sans JP,sans-serif;font-size:15px;line-height:1.6}h1{font-size:22px;margin:0}.app{min-height:100vh;display:flex;flex-direction:column}.header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px;background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap}.header .brand{font-weight:700;font-size:17px;text-decoration:none;color:var(--text)}.header .nav{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.header .nav a{color:var(--accent);text-decoration:none}.header .who{color:var(--muted)}.main{flex:1;width:100%;max-width:900px;margin:0 auto;padding:24px 20px 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