:root{--bg: #f4f6fa;--surface: #ffffff;--surface-2: #f8fafc;--line: #e6eaf2;--text: #0f172a;--muted: #64748b;--faint: #94a3b8;--brand: #2b6cf6;--brand-dark: #1f57cf;--brand-soft: #eaf1ff;--green: #16a34a;--amber: #d97706;--red: #dc2626;--radius: 12px;--shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);--mono: ui-monospace, SFMono-Regular, Menlo, monospace}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--brand)}button,input,textarea,select{font:inherit;color:inherit}.shell{display:grid;grid-template-columns:72px 1fr;height:100%}.rail{background:#101828;display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 0}.rail 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small{opacity:.75}@media (max-width: 1100px){.inbox{grid-template-columns:300px 1fr}.col-side{display:none}}@media (max-width: 760px){.inbox{grid-template-columns:1fr}.inbox[data-open="1"] .col-list,.inbox[data-open="0"] .col-chat{display:none}}