:root {
    color-scheme: light dark;
    --background: #f5f7ff;
    --surface: rgba(255, 255, 255, 0.88);
    --surface-strong: #ffffff;
    --text: #172033;
    --muted: #5f6b82;
    --accent: #3157d5;
    --accent-strong: #203fae;
    --border: rgba(49, 87, 213, 0.16);
    --shadow: 0 20px 55px rgba(43, 65, 130, 0.12);
    --max-width: 780px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #0c1020;
        --surface: rgba(24, 31, 55, 0.9);
        --surface-strong: #181f37;
        --text: #f4f6ff;
        --muted: #b6bfd5;
        --accent: #8da8ff;
        --accent-strong: #bed0ff;
        --border: rgba(141, 168, 255, 0.22);
        --shadow: 0 24px 65px rgba(0, 0, 0, 0.28);
    }
}

* { box-sizing: border-box; }

html {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.65;
    background: var(--background);
    color: var(--text);
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at 12% 0%, rgba(101, 127, 237, 0.18), transparent 32rem),
        radial-gradient(circle at 92% 8%, rgba(235, 167, 83, 0.13), transparent 28rem),
        var(--background);
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-strong); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 4px; }

.skip-link {
    position: absolute;
    top: -80px;
    left: 16px;
    z-index: 10;
    padding: 10px 16px;
    border-radius: 10px;
    background: var(--surface-strong);
    color: var(--text);
}

.skip-link:focus { top: 16px; }

.site-header,
.site-footer,
main {
    width: min(calc(100% - 32px), var(--max-width));
    margin-inline: auto;
}

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-block: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 760;
    letter-spacing: -0.02em;
    text-decoration: none;
}

.brand-mark {
    display: grid;
    width: 36px;
    height: 36px;
    place-items: center;
    border-radius: 12px;
    background: var(--accent);
    color: #fff;
    font-weight: 800;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin: 0;
    padding: 0;
    list-style: none;
}

nav a { color: var(--muted); font-size: 0.92rem; text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); font-weight: 700; }

.hero,
.document,
.card {
    border: 1px solid var(--border);
    background: var(--surface);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.hero,
.document { border-radius: 28px; padding: clamp(28px, 7vw, 60px); }

.eyebrow {
    margin: 0 0 8px;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.18; letter-spacing: -0.025em; }
h1 { margin: 0; font-size: clamp(2.35rem, 9vw, 4.8rem); }
.document h1 { font-size: clamp(2rem, 7vw, 3.6rem); }
h2 { margin-top: 2.4rem; font-size: 1.35rem; }
h3 { margin-top: 1.7rem; font-size: 1.08rem; }
p, li { color: var(--muted); }

.lede { max-width: 620px; margin: 18px 0 0; font-size: clamp(1.04rem, 2.5vw, 1.24rem); }

.meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin-top: 20px;
    color: var(--muted);
    font-size: 0.9rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 22px;
}

.app-grid { grid-template-columns: 1fr; }

.card {
    display: block;
    min-height: 190px;
    padding: 24px;
    border-radius: 22px;
    color: var(--text);
    text-decoration: none;
}

.card h2 { margin: 18px 0 8px; font-size: 1.15rem; }
.card p { margin: 0; font-size: 0.92rem; }
.card-icon { font-size: 1.45rem; }

.callout {
    margin-block: 28px;
    padding: 20px 22px;
    border-left: 4px solid var(--accent);
    border-radius: 4px 14px 14px 4px;
    background: var(--border);
}

.callout p { margin: 0; color: var(--text); }

.button {
    display: inline-flex;
    min-height: 46px;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
    padding: 10px 18px;
    border-radius: 14px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    text-decoration: none;
}

.button:hover { background: var(--accent-strong); color: #fff; }

.site-footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px 24px;
    padding-block: 28px 42px;
    font-size: 0.86rem;
}

.site-footer p { margin: 0; }

@media (max-width: 700px) {
    .site-header { align-items: flex-start; flex-direction: column; }
    .card-grid { grid-template-columns: 1fr; }
    .card { min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; }
}