:root{color-scheme:light;font-family:Segoe UI,Noto Sans,Hiragino Kaku Gothic ProN,Meiryo,sans-serif;--bg: #f4f5f8;--text: #101828;--muted: #64748b;--card: #ffffff;--border: #e2e8f0;--shadow: 0 20px 40px rgba(15, 23, 42, .08);--accent: #2563eb;--accent-weak: #eef2ff;--accent-text: #4338ca;--hero: radial-gradient(circle at top left, #1f2937, #0f172a 65%);--hero-text: #f8fafc;--banner-bg: #fff7ed;--banner-border: #fed7aa;--banner-text: #9a3412;--today: #f97316}:root[data-theme=dark]{color-scheme:dark;--bg: #0b1220;--text: #e2e8f0;--muted: #94a3b8;--card: #111827;--border: #1f2937;--shadow: 0 20px 40px rgba(0, 0, 0, .4);--accent: #60a5fa;--accent-weak: #111827;--accent-text: #93c5fd;--hero: radial-gradient(circle at top left, #0f172a, #020617 70%);--hero-text: #e2e8f0;--banner-bg: #1f2937;--banner-border: #334155;--banner-text: #f8fafc;--today: #fb923c}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}h1{margin:0 0 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