:root{color-scheme:light dark;--bg: #f5f7fa;--bg-elev: #ffffff;--fg: #0e1f2c;--fg-soft: #4a5b6c;--accent: #76a9cf;--accent-strong: #2c6ea3;--border: #d6e1ec;--danger: #b54148;--success: #2d7a4d;--shadow: 0 1px 2px rgba(14, 31, 44, .05), 0 4px 12px rgba(14, 31, 44, .06);--radius: 8px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Cairo,Tahoma,sans-serif;font-size:15px;line-height:1.5}@media (prefers-color-scheme: dark){:root{--bg: #0e1f2c;--bg-elev: #16303f;--fg: #e6eef5;--fg-soft: #9bb1c4;--accent: #76a9cf;--accent-strong: #cae8f7;--border: #2c4a5e}}*{box-sizing:border-box}html,body{margin:0;padding:0;min-height:100vh}body{background:var(--bg);color:var(--fg)}.app-shell{display:grid;grid-template-rows:auto 1fr;min-height:100vh}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--bg-elev);border-bottom:1px solid var(--border);box-shadow:var(--shadow)}.topbar 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