/* LAN Lab — main stylesheet Design tokens and base styles. See CLAUDE.md > Design system. Fonts are loaded via tags in each page's (preconnect + stylesheet) rather than an @import here, so the font CSS downloads in parallel with this file instead of after it. */ :root { --bg: #0f1419; /* page background */ --surface: #1a2128; /* cards, nav */ --text: #e6e8eb; /* body text */ --muted: #8b95a1; /* secondary text */ --accent: #2dd4bf; /* teal — links, primary accents */ --accent-2: #f59e0b; /* amber — highlights, CTAs */ --border: #2a323c; --nav-bg: rgba(15, 20, 25, 0.85); } /* Light theme — toggled by setting */ :root[data-theme="light"] { --bg: #fafaf7; /* subtly warmer than pure off-white */ --surface: #ffffff; --text: #1a1f24; /* slightly softened from near-black */ --muted: #5c6573; --accent: #14b8a6; /* vibrant teal — alive on white, still readable */ --accent-2: #d97706; /* warm amber */ --border: #e2e5e9; --nav-bg: rgba(250, 250, 247, 0.85); } /* Soft tinted backdrop for the light theme so the page isn't a flat sheet */ :root[data-theme="light"] body { background: radial-gradient(ellipse at 18% 6%, rgba(20, 184, 166, 0.05), transparent 42%), radial-gradient(ellipse at 86% 30%, rgba(217, 119, 6, 0.04), transparent 42%), var(--bg); } *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; } @media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } } body { background: var(--bg); color: var(--text); font-family: 'Inter', sans-serif; line-height: 1.6; -webkit-font-smoothing: antialiased; } h1, h2, h3, h4, h5, h6 { line-height: 1.15; font-weight: 600; } a { color: var(--accent); text-decoration: none; } a:hover { text-decoration: underline; } ::selection { background: var(--accent); color: var(--bg); } /* Keyboard focus — visible ring on links, buttons, and the nav toggle */ :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; } /* Anchor jumps (e.g. research.html#causal-ai) clear the sticky nav */ section[id], h2[id] { scroll-margin-top: 84px; } /* Skip link — hidden until focused, for keyboard and screen-reader users */ .skip-link { position: absolute; top: 0; left: -9999px; z-index: 100; background: var(--accent); color: var(--bg); font-weight: 600; font-size: 0.9rem; padding: 0.6rem 1.1rem; border-radius: 0 0 8px 0; } .skip-link:focus { left: 0; text-decoration: none; } /* Sticky site navigation */ .site-nav { position: sticky; top: 0; z-index: 10; background: var(--nav-bg); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); padding: 1rem 0; } .site-nav .container { position: relative; max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; display: flex; align-items: center; gap: 1rem; } .site-nav .brand { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; /* push everything else to the right end of the nav */ margin-right: auto; } .site-nav .brand img { height: 32px; width: auto; } .site-nav ul { list-style: none; display: flex; gap: 1.5rem; } .site-nav a { color: var(--muted); font-size: 0.95rem; } .site-nav a:hover, .site-nav a.active { color: var(--text); text-decoration: none; } /* Mobile hamburger — checkbox-hack, no JS */ .site-nav .nav-toggle-label { display: none; cursor: pointer; padding: 0.5rem; } .site-nav .nav-toggle-label span, .site-nav .nav-toggle-label span::before, .site-nav .nav-toggle-label span::after { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 1px; } .site-nav .nav-toggle-label span { position: relative; } .site-nav .nav-toggle-label span::before, .site-nav .nav-toggle-label span::after { content: ""; position: absolute; } .site-nav .nav-toggle-label span::before { top: -7px; } .site-nav .nav-toggle-label span::after { top: 7px; } @media (max-width: 640px) { .site-nav .nav-toggle-label { display: block; } .site-nav .nav-menu { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; gap: 1rem; background: var(--surface); border-bottom: 1px solid var(--border); padding: 1rem 1.5rem; } .site-nav .nav-toggle:checked ~ .nav-menu { display: flex; } } /* Theme toggle button — sun on dark theme, moon on light */ .theme-toggle { background: transparent; border: 1px solid var(--border); color: var(--muted); cursor: pointer; border-radius: 6px; width: 36px; height: 36px; padding: 0; display: flex; align-items: center; justify-content: center; transition: color 0.15s, border-color 0.15s; flex-shrink: 0; } .theme-toggle:hover { color: var(--text); border-color: var(--accent); } .theme-toggle svg { width: 18px; height: 18px; display: block; } .theme-toggle .icon-moon { display: none; } .theme-toggle .icon-sun { display: block; } :root[data-theme="light"] .theme-toggle .icon-sun { display: none; } :root[data-theme="light"] .theme-toggle .icon-moon { display: block; } /* Site footer — shared across pages */ .site-footer { border-top: 1px solid var(--border); background: var(--surface); padding: 2rem 0; margin-top: 2rem; } .site-footer .container { text-align: center; } .site-footer .footer-contact { color: var(--text); font-size: 0.9rem; } .site-footer .sep { margin: 0 0.4rem; color: var(--border); } /* Rich multi-column footer — opt-in via .site-footer--rich. Other pages keep the single-line .footer-contact layout above. */ .site-footer--rich { padding: 0; margin-top: 3rem; } .site-footer--rich > .container { padding-top: 1.6rem; padding-bottom: 1.1rem; text-align: left; } .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.3fr; gap: 1rem 2rem; align-items: start; } .footer-col .footer-heading { color: var(--text); font-size: 0.85rem; font-weight: 600; margin: 0 0 0.45rem 0; letter-spacing: 0.03em; text-transform: uppercase; } .footer-brand-row { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.5rem; } .footer-logo { width: 30px; height: 30px; flex-shrink: 0; } .footer-lab-name { color: var(--text); font-weight: 600; font-size: 0.95rem; line-height: 1.2; margin: 0; } .footer-lab-tagline { color: var(--muted); font-size: 0.76rem; margin: 0.1rem 0 0; } .footer-address { color: var(--muted); font-size: 0.8rem; line-height: 1.45; margin: 0; } .footer-links { list-style: none; padding: 0; margin: 0; } .footer-links li { padding: 0.1rem 0; color: var(--muted); font-size: 0.82rem; } .footer-links li.is-current { display: none; } .footer-links a { color: var(--muted); text-decoration: none; transition: color 0.15s ease; } .footer-links a:hover { color: var(--accent); } .site-footer--rich .footer-copyright { border-top: 1px solid var(--border); padding: 0.65rem 0; color: var(--muted); font-size: 0.75rem; } .site-footer--rich .footer-copyright .container { text-align: center; } @media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.25rem 1.5rem; } } @media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; gap: 1rem; } }