:root{--color-bg:#ffffff;--color-surface:#f5f6f8;--color-text:#16181d;--color-muted:#676d78;--color-border:#e3e5ea;--color-accent:#2c5fd8;--color-accent-soft:#eaf0fc;--color-accent-text:#ffffff;--color-danger:#c93b3b;--color-success:#2e8b57;--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--space-1:4px;--space-2:8px;--space-3:16px;--space-4:24px;--space-5:32px;--space-6:48px;--radius:6px;--radius-full:999px}*{box-sizing:border-box;margin:0;padding:0}body,html{background:var(--color-bg);color:var(--color-text);font-family:var(--font-sans);line-height:1.55;-webkit-font-smoothing:antialiased}h1,h2,h3{letter-spacing:-.01em;line-height:1.25}a{color:var(--color-accent);text-decoration:none}button{font:inherit;cursor:pointer}img{max-width:100%}::selection{background:var(--color-accent-soft)}