:root{--color-bg: #ffffff;--color-surface: #fafaf8;--color-border: #e5e2db;--color-text: #1a1a1a;--color-text-muted: #6b6b6b;--color-accent: #c84e2c;--color-accent-hover: #a83f20;--color-success: #2d7a3e;--color-warning: #b57900;--color-danger: #a83020;--font-display: "IBM Plex Serif", Georgia, serif;--font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "IBM Plex Mono", "SF Mono", Menlo, Consolas, monospace;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-6: 24px;--space-8: 32px;--space-12: 48px}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--color-bg);color:var(--color-text);font-family:var(--font-body);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100vh}h1,h2,h3,h4{font-family:var(--font-display);font-weight:500;margin:0 0 var(--space-4);letter-spacing:-.01em}h1{font-size:32px;line-height:1.2}h2{font-size:24px;line-height:1.25}h3{font-size:18px;line-height:1.3}.label-mono{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;text-transform:uppercase;color:var(--color-text-muted)}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;font-size:inherit}.btn{background:var(--color-accent);color:#fff;border:none;border-radius:var(--radius-md);padding:var(--space-3) var(--space-6);font-weight:500;cursor:pointer;transition:background .15s ease}.btn:hover{background:var(--color-accent-hover)}.btn-secondary{background:transparent;color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover{background:var(--color-surface)}