:root {
    --bg: #0b1720;
    --bg-soft: #102333;
    --panel: rgba(10, 24, 36, 0.82);
    --panel-strong: rgba(8, 18, 28, 0.92);
    --text: #ebf2f7;
    --muted: #b8cad8;
    --amber: #ffbf69;
    --cyan: #73d2de;
    --line: rgba(255, 255, 255, 0.12);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(255, 191, 105, 0.18), transparent 28%),
        radial-gradient(circle at top right, rgba(115, 210, 222, 0.2), transparent 24%),
        linear-gradient(180deg, #102232 0%, #09131b 100%);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 36px 36px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 88%);
}

.page-shell {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    width: 90%;
}

.hero {
    padding: 24px 0 48px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 18px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(8, 18, 28, 0.64);
    backdrop-filter: blur(16px);
}

.brand,
.topbar a,
.text-link,
.button {
    color: var(--text);
    text-decoration: none;
}

.brand {
    font-weight: 700;
    letter-spacing: 0.04em;
}

.topbar-links {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.topbar-links a {
    color: var(--muted);
}

.hero-copy {
    padding: 72px 0 24px;
}

.eyebrow,
.card-kicker,
.roadmap span {
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.8rem;
    color: var(--amber);
}

h1,
h2,
h3 {
    margin: 0;
    line-height: 1.05;
}

h1 {
    max-width: 24ch;
    margin-top: 16px;
    font-size: clamp(3rem, 8vw, 6rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3.25rem);
}

h3 {
    font-size: 1.5rem;
}

.lead,
.card p,
.glass-panel p,
.faq p,
.roadmap p,
.topic-panel li,
.card-list dd,
.footer p {
    font-family: "Source Serif 4", serif;
    color: var(--muted);
    line-height: 1.65;
    font-size: 1.05rem;
}

.lead {
    max-width: 760px;
    margin: 24px 0 0;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 28px;
}

.button {
    padding: 14px 18px;
    border-radius: 999px;
    border: 1px solid transparent;
    font-weight: 600;
}

.button-primary {
    background: var(--amber);
    color: #142330;
}

.button-secondary {
    border-color: rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.05);
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    padding: 0;
    margin: 32px 0 0;
    list-style: none;
}

.hero-metrics li,
.card,
.topic-panel,
.glass-panel,
.roadmap article,
.faq details {
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.hero-metrics li {
    padding: 20px;
}

.hero-metrics strong {
    display: block;
    font-size: 1.25rem;
}

.hero-metrics span {
    display: block;
    margin-top: 6px;
    color: var(--muted);
}

.section {
    padding: 40px 0;
}

.section-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr 1fr;
    gap: 22px;
}

.section-heading {
    padding-right: 24px;
}

.section-heading.narrow {
    max-width: 720px;
}

.card,
.topic-panel,
.glass-panel,
.roadmap article,
.faq details {
    padding: 24px;
}

.accent-amber {
    background: linear-gradient(180deg, rgba(255, 191, 105, 0.14), rgba(10, 24, 36, 0.84));
}

.accent-cyan {
    background: linear-gradient(180deg, rgba(115, 210, 222, 0.14), rgba(10, 24, 36, 0.84));
}

.card-list {
    display: grid;
    gap: 14px;
    margin: 18px 0;
}

.card-list dt {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text);
}

.card-list dd {
    margin: 6px 0 0;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
    font-weight: 600;
}

.roadmap {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
    margin-top: 24px;
}

.topics-layout,
.split-section {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 20px;
}

.projects-grid article {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(17, 30, 45, 0.9);
    box-shadow: var(--shadow);
}

.projects-grid h3 {
    margin-bottom: 12px;
}

.projects-grid ul {
    padding-left: 20px;
    margin: 12px 0 0;
}

.projects-grid li+li {
    margin-top: 8px;
}

.projects-grid a {
    color: var(--text);
    font-weight: 600;
}

.topic-panel ul {
    margin: 18px 0 0;
    padding-left: 20px;
}

.topic-panel li+li {
    margin-top: 10px;
}

.glass-panel {
    background: var(--panel-strong);
}

.faq details+details {
    margin-top: 16px;
}

.faq summary {
    cursor: pointer;
    font-weight: 600;
}

.faq p {
    margin: 14px 0 0;
}

.footer {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 24px 0 48px;
}

@media (max-width: 960px) {

    .section-grid,
    .topics-layout,
    .split-section,
    .roadmap,
    .hero-metrics,
    .footer {
        grid-template-columns: 1fr;
        display: grid;
    }

    .topbar {
        border-radius: 28px;
    }

    .topbar,
    .footer {
        display: block;
    }

    .topbar-links {
        margin-top: 12px;
    }

    h1 {
        max-width: 100%;
    }

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

@media (max-width: 640px) {
    .page-shell {
        width: min(100% - 20px, 1160px);
    }

    .hero-copy {
        padding-top: 48px;
    }

    .card,
    .topic-panel,
    .glass-panel,
    .roadmap article,
    .faq details {
        padding: 20px;
    }
}