:root{--bg: #f0f2f5;--surface: #ffffff;--text: #2c3e50;--text-muted: #6c757d;--accent: #3498db;--border: #dee2e6;--radius: 8px}*,*:before,*:after{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}.admin-nav{background:var(--surface);border-bottom:1px solid var(--border);padding:14px 24px}.admin-nav-inner{max-width:900px;margin:0 auto}.admin-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:700;font-size:1.1rem}.admin-logo{height:28px}.admin-main{max-width:900px;margin:60px auto;padding:0 24px}.admin-placeholder{text-align:center;padding:80px 20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}.admin-placeholder h1{margin:0 0 12px;font-size:1.6rem}.admin-placeholder p{color:var(--text-muted);margin:0}