:root{--bg-color: #f8f9fa;--bg-color-rgb: 248, 249, 250;--tile-bg: #ffffff;--text-primary: #1a1a1a;--text-secondary: #4a4a4a;--brand-cyan: #00aeef;--border-color: #1a1a1a;--shadow-color: rgba(0, 0, 0, .15);--accent-yellow: #ffcf00;--border-width: 3px;--radius-medium: 8px;--grid-gap: 1.5rem}body.dark-mode{--bg-color: #0b0e14;--bg-color-rgb: 11, 14, 20;--tile-bg: #161b22;--text-primary: #f0f6fc;--text-secondary: #8b949e;--brand-cyan: #00d2ff;--border-color: #f0f6fc;--shadow-color: rgba(0, 210, 255, .2);--accent-yellow: #ffea00}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{font-family:Inter,Noto Sans JP,sans-serif;background-color:var(--bg-color);color:var(--text-primary);transition:background-color .3s ease,color .3s ease;min-height:100vh;padding:1.5rem;line-height:1.6}.main-header{position:sticky;top:1rem;z-index:1000;display:flex;justify-content:space-between;align-items:center;max-width:1200px;width:100%;margin:0 auto 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