:root{color-scheme:light;--bg: #ffffff;--text: #111827;--muted: #6b7280;--border: #e5e7eb;--container: 1100px;--nav-h: 64px;--radius: 12px}*,*:before,*:after{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";line-height:1.5;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;display:block}.container{width:min(100% - 32px,var(--container));margin-inline:auto}.app{min-height:100vh;display:flex;flex-direction:column}.main{flex:1}.section{padding:48px 0}.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:20px}.muted{color:var(--muted)}.nav{height:var(--nav-h);border-bottom:1px solid var(--border);display:flex;align-items:center}.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-weight:700;letter-spacing:.2px}.nav-links{display:flex;align-items:center;gap:16px;font-size:14px;font-weight:600}.footer{border-top:1px solid var(--border);padding:20px 0;font-size:14px;color:var(--muted);text-align:center}