:root{--bg: #f6f7f9;--surface: #ffffff;--border: #dfe3e8;--text: #1b2733;--subtle: #63707e;--accent: #2f5d8c;--accent-soft: #e8f0f8;--danger: #a4342b;--radius: 6px}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #14191f;--surface: #1c232b;--border: #2e3844;--text: #e6ebf1;--subtle: #9aa7b4;--accent: #6fa8dc;--accent-soft: #23313f;--danger: #e08b82}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}button{font:inherit;cursor:pointer}a{color:var(--accent)}input,select,textarea{font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:6px 8px}.app{display:flex;flex-direction:column;height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px;background:var(--surface);border-bottom:1px solid var(--border)}.app-header 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