:root {
    --brand-green: #3fc38a;
    --brand-green-dark: #12805f;
    --brand-mint: #dff7ec;
    --brand-teal: #0f6f66;

    --page-bg: #f8f9fa;;
    --page-bg-deep: #e7f6ef;
    --surface: #ffffff;
    --surface-soft: #f7fcfa;

    --ink: #102a27;
    --ink-soft: #2e4742;
    --muted: #627873;

    --line: #d7e8e0;
    --line-strong: #bdd9cf;

    --external: #385865;
    --external-soft: #e8f1f2;
    --external-accent: #5aaeb1;

    --shadow-soft: 0 18px 60px rgba(15, 72, 60, 0.12);
    --shadow-card: 0 14px 38px rgba(15, 72, 60, 0.10);
    --shadow-card-hover: 0 22px 52px rgba(15, 72, 60, 0.16);

    --radius-xl: 32px;
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 10px;

    --container: 1180px;
    --brand-mark-url: url("../graphics/iluvana-brand-vector.svg");
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    min-height: 100%;
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    color: var(--ink);
    background-color: var(--page-bg);
    line-height: 1.6;
}

a {
    color: inherit;
}

.page-shell {
    width: min(100% - 40px, var(--container));
    margin: 0 auto;
}

.docs-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 28px 0;
}

.brand-lockup {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    color: var(--ink);
    text-decoration: none;
}

.brand-logo {
    display: block;
    width: 180px;
    max-width: 42vw;
    height: auto;
}

.brand-divider {
    width: 1px;
    height: 28px;
    background: var(--line-strong);
}

.brand-context {
    color: var(--ink-soft);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-nav a {
    color: var(--ink-soft);
    text-decoration: none;
    font-size: 0.94rem;
    font-weight: 700;
    padding: 9px 12px;
    border-radius: 999px;
    transition: background-color 160ms ease, color 160ms ease;
}

.header-nav a:hover,
.header-nav a:focus-visible {
    color: var(--brand-green-dark);
    background: rgba(255, 255, 255, 0.72);
    text-decoration: none;
}

.hero {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.72fr);
    gap: 42px;
    align-items: flex-start;
    padding: 72px;
    border: 1px solid rgba(255, 255, 255, 0.68);
    border-radius: var(--radius-xl);
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(245, 252, 249, 0.86)),
        linear-gradient(135deg, rgba(63, 195, 138, 0.16), rgba(90, 174, 177, 0.12));
    box-shadow: var(--shadow-soft);
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: auto -120px -180px auto;
    width: 420px;
    height: 420px;
    border-radius: 999px;
    background: rgba(63, 195, 138, 0.18);
    filter: blur(8px);
}

.hero-content,
.hero-panel {
    position: relative;
    z-index: 1;
}

.eyebrow {
    margin: 0 0 14px;
    color: var(--brand-green-dark);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.hero h1 {
    max-width: 760px;
    margin: 0;
    color: var(--ink);
    font-size: clamp(2.55rem, 5vw, 5rem);
    line-height: 0.98;
    letter-spacing: -0.06em;
}

.hero-copy {
    max-width: 660px;
    margin: 24px 0 0;
    color: var(--muted);
    font-size: clamp(1rem, 1.6vw, 1.22rem);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 34px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 20px;
    border-radius: 999px;
    font-weight: 800;
    text-decoration: none;
    transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.button:hover,
.button:focus-visible {
    transform: translateY(-1px);
    text-decoration: none;
}

.button-primary {
    color: #ffffff;
    background: linear-gradient(135deg, var(--brand-green-dark), var(--brand-green));
    box-shadow: 0 12px 26px rgba(18, 128, 95, 0.24);
}

.button-secondary {
    color: var(--ink-soft);
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid var(--line);
}

.panel-window {
    max-width: 420px;
    margin-left: auto;
    border: 1px solid rgba(255, 255, 255, 0.76);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.78);
    box-shadow: 0 24px 56px rgba(15, 72, 60, 0.14);
    overflow: hidden;
    backdrop-filter: blur(18px);
}

.panel-bar {
    display: flex;
    gap: 8px;
    padding: 16px;
    border-bottom: 1px solid var(--line);
    background: rgba(247, 252, 250, 0.82);
}

.panel-bar span {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: var(--line-strong);
}

.panel-bar span:first-child {
    background: var(--brand-green);
}

.panel-content {
    padding: 18px;
}

.panel-row {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    align-items: center;
    padding: 14px;
    border-radius: var(--radius-md);
}

.panel-row + .panel-row {
    margin-top: 8px;
}

.panel-row-strong {
    background: linear-gradient(135deg, rgba(63, 195, 138, 0.14), rgba(255, 255, 255, 0.72));
    border: 1px solid rgba(63, 195, 138, 0.22);
}

.panel-icon {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background:
        linear-gradient(135deg, rgba(63, 195, 138, 0.9), rgba(18, 128, 95, 0.9));
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.24);
}

.panel-row strong,
.panel-row small {
    display: block;
}

.panel-row strong {
    color: var(--ink);
    font-size: 0.96rem;
}

.panel-row small {
    color: var(--muted);
    font-size: 0.84rem;
}

.resources {
    padding: 70px 0 56px;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 24px;
}

.section-heading h2 {
    margin: 0;
    color: var(--ink);
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    line-height: 1.05;
    letter-spacing: -0.04em;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}

.resource-card {
    position: relative;
    min-height: 360px;
    display: flex;
    flex-direction: column;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    color: var(--ink);
    background: rgba(255, 255, 255, 0.86);
    box-shadow: var(--shadow-card);
    text-decoration: none;
    overflow: hidden;
    transition:
        transform 180ms ease,
        box-shadow 180ms ease,
        border-color 180ms ease,
        background-color 180ms ease;
}

.resource-card:hover,
.resource-card:focus-visible {
    transform: translateY(-4px);
    border-color: rgba(63, 195, 138, 0.48);
    box-shadow: var(--shadow-card-hover);
    text-decoration: none;
}

.card-topline {
    position: absolute;
    inset: 0 0 auto 0;
    height: 5px;
    background: linear-gradient(90deg, var(--brand-green-dark), var(--brand-green));
}

.resource-card-featured {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(241, 252, 247, 0.94));
    border-color: rgba(63, 195, 138, 0.38);
}

.resource-card-external {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(232, 241, 242, 0.92));
    border-color: rgba(90, 174, 177, 0.35);
}

.resource-card-external .card-topline {
    background: linear-gradient(90deg, var(--external), var(--external-accent));
}

.card-label {
    align-self: flex-start;
    margin-bottom: 26px;
    padding: 7px 10px;
    border-radius: 999px;
    color: var(--brand-green-dark);
    background: rgba(63, 195, 138, 0.12);
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.resource-card-external .card-label {
    color: var(--external);
    background: rgba(90, 174, 177, 0.14);
}

.card-symbol {
    width: 62px;
    height: 62px;
    display: grid;
    place-items: center;
    margin-bottom: 24px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(63, 195, 138, 0.14), rgba(18, 128, 95, 0.08));
}

.card-symbol-overview span,
.card-symbol-tutorials span {
    position: relative;
    width: 28px;
    height: 34px;
    border: 3px solid var(--brand-green-dark);
    border-radius: 6px;
}

.card-symbol-overview span::before,
.card-symbol-overview span::after,
.card-symbol-tutorials span::before,
.card-symbol-tutorials span::after {
    content: "";
    position: absolute;
    left: 6px;
    right: 6px;
    height: 3px;
    border-radius: 999px;
    background: var(--brand-green);
}

.card-symbol-overview span::before,
.card-symbol-tutorials span::before {
    top: 8px;
}

.card-symbol-overview span::after,
.card-symbol-tutorials span::after {
    top: 18px;
}

.card-symbol-tutorials span {
    transform: rotate(-4deg);
}

.card-symbol-tutorials span::after {
    width: 10px;
    right: auto;
}

.card-symbol-brand {
    background: var(--external-soft);
}

.card-symbol-brand::before {
    content: "";
    width: 42px;
    height: 42px;
    background: var(--external);
    -webkit-mask: var(--brand-mark-url) center / contain no-repeat;
    mask: var(--brand-mark-url) center / contain no-repeat;
}

.resource-card h3 {
    margin: 0;
    color: var(--ink);
    font-size: 1.45rem;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.resource-card p {
    margin: 14px 0 28px;
    color: var(--muted);
}

.card-link {
    margin-top: auto;
    color: var(--brand-green-dark);
    font-weight: 900;
}

.card-link::after {
    content: " →";
}

.resource-card-external .card-link {
    color: var(--external);
}

.docs-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 28px 0 42px;
    color: var(--muted);
    font-size: 0.92rem;
    border-top: 1px solid rgba(189, 217, 207, 0.72);
}

.docs-footer p {
    margin: 0;
}

.docs-footer a {
    color: var(--brand-green-dark);
    font-weight: 800;
    text-decoration: none;
}

.docs-footer a:hover,
.docs-footer a:focus-visible {
    text-decoration: underline;
}

@media (max-width: 980px) {
    .docs-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .hero {
        grid-template-columns: 1fr;
        padding: 48px;
    }

    .panel-window {
        max-width: none;
        margin-left: 0;
    }

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

    .resource-card {
        min-height: auto;
    }
}

@media (max-width: 680px) {
    .page-shell {
        width: min(100% - 28px, var(--container));
    }

    .brand-lockup {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
    }

    .brand-divider {
        display: none;
    }

    .header-nav {
        width: 100%;
        flex-wrap: wrap;
    }

    .header-nav a {
        background: rgba(255, 255, 255, 0.64);
    }

    .hero {
        padding: 34px 24px;
        border-radius: 24px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .button {
        width: 100%;
    }

    .section-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .docs-footer {
        align-items: flex-start;
        flex-direction: column;
    }
}