:root{--bg: #ffffff;--surface: #f5f7fa;--text: #16191d;--muted: #556170;--border: #e1e6ec;--accent: #0b5fb8;--accent-text: #ffffff;--accent-soft: #e7f0fb;--accent-soft-text: #0a4f99;--focus: var(--accent)}*,*:before,*:after{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}a{color:inherit}:focus-visible{outline:2px solid var(--focus);outline-offset:2px}h1,h2,h3,h4{line-height:1.25;margin:0}.column{max-width:760px;margin:0 auto;padding:0 20px}