/* ========================================================================= CSAT — Global stylesheet Common to every page: theme variables, header, footer, nav, buttons, utilities, animations and responsive rules. Theme is driven by CSS custom properties. Light is the default; the dark theme overrides the variables via [data-theme="dark"] on . ========================================================================= */ /* ---------- Design tokens -------------------------------------------------- */ :root { /* Brand */ --brand-navy: #16233f; /* deep space navy (matches logo) */ --brand-navy-2: #1e3a5f; --brand-blue: #2f7bff; /* electric blue accent */ --brand-blue-bright: #4d9fff; --brand-cyan: #38e1ff; /* Light theme (default) */ --bg: #f5f7fb; --bg-elevated: #ffffff; --bg-header: rgba(255, 255, 255, 0.82); --bg-header-scrolled: rgba(255, 255, 255, 0.95); --surface: #ffffff; --surface-2: #eef2f9; --text: #14203a; --text-muted: #566178; --border: #dde4f0; --accent: var(--brand-blue); --accent-strong: #1f5fd6; --hero-overlay: linear-gradient(180deg, rgba(10,18,38,.72), rgba(10,18,38,.55)); --shadow: 0 10px 30px rgba(20, 32, 58, 0.10); --shadow-strong: 0 18px 50px rgba(20, 32, 58, 0.18); /* Metrics */ --header-h: 68px; --maxw: 1180px; --radius: 14px; --radius-sm: 10px; --ease: cubic-bezier(.4, 0, .2, 1); --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; } [data-theme="dark"] { --bg: #070c1a; --bg-elevated: #0d1528; --bg-header: rgba(9, 15, 30, 0.72); --bg-header-scrolled: rgba(9, 15, 30, 0.92); --surface: #0f1930; --surface-2: #14213f; --text: #eaf0ff; --text-muted: #9fb0cf; --border: #223252; --accent: var(--brand-blue-bright); --accent-strong: var(--brand-cyan); --hero-overlay: linear-gradient(180deg, rgba(5,10,24,.55), rgba(5,10,24,.78)); --shadow: 0 10px 30px rgba(0, 0, 0, 0.45); --shadow-strong: 0 18px 50px rgba(0, 0, 0, 0.6); } /* ---------- Reset / base --------------------------------------------------- */ *, *::before, *::after { box-sizing: border-box; } html { scroll-behavior: smooth; } @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; } } body { margin: 0; font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; -webkit-font-smoothing: antialiased; /* color/background transition powers the smooth light<->dark change */ transition: background-color .4s var(--ease), color .4s var(--ease); } img { max-width: 100%; display: block; } a { color: var(--accent); text-decoration: none; } a:hover { text-decoration: underline; } h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; letter-spacing: -0.02em; } h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); } h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); } h3 { font-size: 1.25rem; } p { margin: 0 0 1rem; } .container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(18px, 4vw, 40px); } .section { padding-block: clamp(56px, 8vw, 110px); } .section-tight { padding-block: clamp(36px, 5vw, 64px); } .eyebrow { display: inline-block; font-size: .8rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase; color: var(--accent); margin-bottom: .6rem; } .lead { font-size: 1.15rem; color: var(--text-muted); max-width: 62ch; } .muted { color: var(--text-muted); } .center { text-align: center; } .mx-auto { margin-inline: auto; } /* ---------- Buttons -------------------------------------------------------- */ .btn { --_bg: var(--accent); display: inline-flex; align-items: center; gap: .55rem; padding: .8rem 1.5rem; border-radius: 999px; font-weight: 600; font-size: .98rem; border: 1px solid transparent; cursor: pointer; transition: transform .2s var(--ease), box-shadow .2s var(--ease), background-color .2s; text-decoration: none; } .btn:hover { text-decoration: none; } .btn-primary { background: linear-gradient(135deg, var(--brand-blue), var(--accent-strong)); color: #fff; box-shadow: 0 8px 24px rgba(47, 123, 255, .35); } .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(47, 123, 255, .45); } .btn-ghost { background: transparent; color: var(--text); border-color: var(--border); } .btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); } /* ---------- Header --------------------------------------------------------- */ .site-header { position: fixed; inset: 0 0 auto 0; height: var(--header-h); z-index: 100; display: flex; align-items: center; background: var(--bg-header); backdrop-filter: saturate(180%) blur(14px); -webkit-backdrop-filter: saturate(180%) blur(14px); border-bottom: 1px solid transparent; transition: background-color .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease), height .25s var(--ease); } .site-header.scrolled { background: var(--bg-header-scrolled); border-bottom-color: var(--border); box-shadow: var(--shadow); } .site-header .container { display: flex; align-items: center; gap: 1rem; width: 100%; } .brand { display: inline-flex; align-items: center; gap: .6rem; margin-right: auto; font-weight: 700; } /* Transparent 16:9 logo — fills (almost) the whole header height, no tile. It's navy artwork, so on dark backgrounds we tint it white via a filter. */ .brand { height: 100%; } .brand img { height: calc(var(--header-h) - 14px); width: auto; transition: filter .3s var(--ease); } [data-theme="dark"] .brand img { filter: brightness(0) invert(1); } .brand:hover { text-decoration: none; } /* ---- Home hero: near-transparent header that only asserts itself on hover --- At the top of the home page the header floats over the dark photo with no background (light text/logo). Hovering it makes it grow a little and turn opaque, and text/logo revert to the theme colours. */ body[data-page="home"] .site-header:not(.scrolled) { background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; border-bottom-color: transparent; box-shadow: none; } body[data-page="home"] .site-header:not(.scrolled) .nav-link, body[data-page="home"] .site-header:not(.scrolled) .brand { color: #fff; } body[data-page="home"] .site-header:not(.scrolled) .brand img { filter: brightness(0) invert(1); } body[data-page="home"] .site-header:not(.scrolled) .icon-btn { background: rgba(255, 255, 255, .06); border-color: rgba(255, 255, 255, .45); color: #fff; } body[data-page="home"] .site-header:not(.scrolled) .nav-toggle { background: rgba(255, 255, 255, .06); border-color: rgba(255, 255, 255, .45); } body[data-page="home"] .site-header:not(.scrolled) .nav-toggle span { background: #fff; } body[data-page="home"] .site-header:not(.scrolled):hover { height: calc(var(--header-h) + 10px); background: var(--bg-header-scrolled); -webkit-backdrop-filter: saturate(180%) blur(14px); backdrop-filter: saturate(180%) blur(14px); border-bottom-color: var(--border); box-shadow: var(--shadow); } body[data-page="home"] .site-header:not(.scrolled):hover .nav-link, body[data-page="home"] .site-header:not(.scrolled):hover .brand { color: var(--text); } body[data-page="home"] .site-header:not(.scrolled):hover .brand img { filter: none; } [data-theme="dark"] body[data-page="home"] .site-header:not(.scrolled):hover .brand img { filter: brightness(0) invert(1); } body[data-page="home"] .site-header:not(.scrolled):hover .icon-btn { background: var(--surface); border-color: var(--border); color: var(--text); } body[data-page="home"] .site-header:not(.scrolled):hover .nav-toggle { background: var(--surface); border-color: var(--border); } body[data-page="home"] .site-header:not(.scrolled):hover .nav-toggle span { background: var(--text); } /* Nav */ .nav { display: flex; align-items: center; gap: .35rem; } .nav-item { position: relative; } .nav-link { display: inline-flex; align-items: center; gap: .35rem; padding: .5rem .85rem; color: var(--text); font-weight: 500; border-radius: 8px; cursor: pointer; } .nav-link:hover { text-decoration: none; color: var(--accent); } /* animated underline */ .nav-link::after { content: ""; position: absolute; left: .85rem; right: .85rem; bottom: .32rem; height: 2px; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .28s var(--ease); } .nav-link:hover::after, .nav-item.active > .nav-link::after { transform: scaleX(1); } .nav-link .caret { width: 10px; height: 10px; transition: transform .25s var(--ease); } .nav-item.open .nav-link .caret { transform: rotate(180deg); } /* Dropdown */ .dropdown { position: absolute; top: calc(100% + 8px); left: 0; min-width: 220px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: var(--shadow-strong); padding: .4rem; display: grid; gap: 2px; opacity: 0; visibility: hidden; transform: translateY(6px); transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s; } .nav-item:hover > .dropdown, .nav-item.open > .dropdown { opacity: 1; visibility: visible; transform: translateY(0); } .dropdown a { display: block; padding: .6rem .8rem; border-radius: 8px; color: var(--text); font-weight: 500; } .dropdown a:hover { background: var(--surface-2); color: var(--accent); text-decoration: none; } .dropdown a.nav-external::after { content: "↗"; margin-left: .4rem; opacity: .6; font-size: .9em; } .dropdown a.is-disabled { opacity: .5; cursor: not-allowed; } .dropdown a.is-disabled:hover { background: transparent; color: var(--text); } /* Header controls (lang + theme) — set a bit apart from the nav links */ .header-controls { display: flex; align-items: center; gap: .4rem; margin-left: .6rem; } @media (min-width: 821px) { .header-controls { margin-left: 1.4rem; padding-left: 1.4rem; border-left: 1px solid var(--border); } } .icon-btn { display: inline-flex; align-items: center; justify-content: center; gap: .35rem; height: 40px; min-width: 40px; padding: 0 .7rem; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font-weight: 600; font-size: .9rem; cursor: pointer; transition: border-color .2s, color .2s, transform .2s var(--ease); } .icon-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); } .icon-btn svg { width: 18px; height: 18px; } /* theme icon swap */ .theme-toggle .icon-sun { display: none; } .theme-toggle .icon-moon { display: block; } [data-theme="dark"] .theme-toggle .icon-sun { display: block; } [data-theme="dark"] .theme-toggle .icon-moon { display: none; } /* Hamburger */ .nav-toggle { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); cursor: pointer; } .nav-toggle span { display: block; height: 2px; width: 20px; margin-inline: auto; background: var(--text); transition: transform .3s var(--ease), opacity .2s var(--ease); } body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); } body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; } body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); } /* ---------- Footer --------------------------------------------------------- */ .site-footer { margin-top: auto; background: var(--brand-navy); color: #cdd8ef; } [data-theme="dark"] .site-footer { background: #05091a; border-top: 1px solid var(--border); } .footer-banner { height: 140px; background: radial-gradient(1200px 200px at 20% -40%, rgba(56,225,255,.25), transparent 60%), linear-gradient(120deg, var(--brand-navy), var(--brand-navy-2) 60%, #0a1730); position: relative; overflow: hidden; display: grid; place-items: center; } .footer-banner::after { /* subtle starfield placeholder — replace with real banner image later */ content: ""; position: absolute; inset: 0; background-image: radial-gradient(1.5px 1.5px at 15% 40%, #fff, transparent), radial-gradient(1.5px 1.5px at 70% 60%, #cfe4ff, transparent), radial-gradient(1px 1px at 45% 20%, #fff, transparent), radial-gradient(1px 1px at 85% 30%, #fff, transparent), radial-gradient(1.5px 1.5px at 30% 80%, #cfe4ff, transparent); opacity: .8; } .footer-banner span { position: relative; font-weight: 700; letter-spacing: .28em; color: #eaf2ff; text-transform: uppercase; font-size: .85rem; } .footer-main { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; padding-block: 3rem; } .footer-main h4 { color: #fff; margin: 0 0 .8rem; font-size: 1rem; } .footer-main a { color: #cdd8ef; } .footer-main a:hover { color: #fff; } .footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; } .footer-brand img { height: 54px; width: auto; background: #fff; border-radius: 10px; padding: 4px; margin-bottom: .9rem; } .footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-block: 1.2rem; font-size: .85rem; color: #9fb0cf; } .footer-bottom .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; } /* Funding acknowledgement banner (main page only) — the image has a white background, so it sits on a white band spanning the footer width. */ .footer-funding { background: #ffffff; padding: 22px clamp(18px, 4vw, 40px); text-align: center; } .footer-funding img { width: 100%; max-width: 1000px; height: auto; margin-inline: auto; } /* ---------- Layout scaffolding -------------------------------------------- */ body { display: flex; flex-direction: column; min-height: 100vh; } main { flex: 1 0 auto; } .page-top { padding-top: var(--header-h); } /* offset fixed header on inner pages */ /* Generic page hero (inner pages) */ .page-hero { padding: clamp(60px, 9vw, 120px) 0 clamp(36px, 5vw, 64px); background: radial-gradient(900px 400px at 80% -20%, rgba(47,123,255,.18), transparent 60%), var(--bg-elevated); border-bottom: 1px solid var(--border); text-align: center; } /* Cards grid */ .card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.6rem; box-shadow: var(--shadow); transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s var(--ease); } .card:hover { transform: translateY(-6px); box-shadow: var(--shadow-strong); border-color: var(--accent); } .grid { display: grid; gap: 1.4rem; } .grid-3 { grid-template-columns: repeat(3, 1fr); } .grid-4 { grid-template-columns: repeat(4, 1fr); } .grid-2 { grid-template-columns: repeat(2, 1fr); } /* ---------- Scroll reveal -------------------------------------------------- */ .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); } .reveal.in { opacity: 1; transform: none; } .reveal.d1 { transition-delay: .08s; } .reveal.d2 { transition-delay: .16s; } .reveal.d3 { transition-delay: .24s; } /* ---------- Responsive ----------------------------------------------------- */ @media (max-width: 900px) { .footer-main { grid-template-columns: 1fr 1fr; } .grid-4 { grid-template-columns: repeat(2, 1fr); } } @media (max-width: 820px) { .nav-toggle { display: flex; } .nav { position: fixed; inset: var(--header-h) 0 auto 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--bg-header-scrolled); backdrop-filter: saturate(180%) blur(14px); -webkit-backdrop-filter: saturate(180%) blur(14px); border-bottom: 1px solid var(--border); padding: .5rem clamp(18px, 4vw, 40px) 1rem; max-height: calc(100vh - var(--header-h)); overflow-y: auto; transform: translateY(-140%); transition: transform .35s var(--ease); box-shadow: var(--shadow-strong); } body.nav-open .nav { transform: translateY(0); } .nav-link { padding: .9rem .4rem; width: 100%; } .nav-link::after { display: none; } .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; padding: 0 0 .4rem 1rem; background: transparent; display: none; } .nav-item.open > .dropdown { display: grid; } .nav-item:hover > .dropdown { visibility: hidden; } /* disable hover-open on touch */ .nav-item.open:hover > .dropdown { visibility: visible; } } @media (max-width: 620px) { .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; } .footer-main { grid-template-columns: 1fr; } .brand span { display: none; } } /* ---------- Lightbox (click any content image to enlarge) ----------------- */ /* Content images inside
are zoomable unless marked .no-zoom */ main img:not(.no-zoom) { cursor: zoom-in; } .lightbox { position: fixed; inset: 0; z-index: 2000; display: none; align-items: center; justify-content: center; padding: 4vw; background: rgba(3, 6, 14, 0.92); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); cursor: zoom-out; opacity: 0; transition: opacity .25s var(--ease); } .lightbox.open { display: flex; opacity: 1; } .lightbox img { max-width: 96vw; max-height: 92vh; width: auto; height: auto; border-radius: 10px; box-shadow: 0 30px 90px rgba(0, 0, 0, .6); animation: lbZoom .28s var(--ease); } @keyframes lbZoom { from { transform: scale(.94); opacity: .4; } to { transform: scale(1); opacity: 1; } } .lightbox__close { position: absolute; top: 16px; right: 22px; width: 44px; height: 44px; display: grid; place-items: center; font-size: 2rem; line-height: 1; color: #fff; background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .25); border-radius: 50%; cursor: pointer; } .lightbox__close:hover { background: rgba(255, 255, 255, .2); }