:root{--font: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--bg: #f7f7f8;--bg-panel: #ffffff;--bg-hover: #eef1f4;--bg-active: #e3ecf7;--text: #1a1c1f;--text-sub: #5b6470;--border: #dde1e6;--accent: #2563eb;--accent-text: #ffffff;--danger: #dc2626;--unread-dot: #2563eb;--shadow: 0 4px 16px rgba(0, 0, 0, .12)}:root[data-theme=dark]{--bg: #15171a;--bg-panel: #1e2126;--bg-hover: #272b31;--bg-active: #2b3a52;--text: #e8eaed;--text-sub: #9aa3ad;--border: #33383f;--accent: #5b8def;--accent-text: #0e1116;--danger: #ef6b6b;--unread-dot: #5b8def;--shadow: 0 4px 16px rgba(0, 0, 0, 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