:root {
    color-scheme: light;
    --color-background: #F3F6FA;
    --color-surface: #FFFFFF;
    --color-heading: #16324F;
    --color-text: #334155;
    --color-muted: #64748B;
    --color-accent: #087E8B;
    --color-border: #E2E8F0;
    --font-body: Roboto, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --radius: 0.75rem;
    --space: clamp(1.25rem, 4vw, 3rem);
}

/* Follow the device even when JavaScript is unavailable. */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --color-background: #0D1726;
        --color-surface: #162438;
        --color-heading: #F2F7FC;
        --color-text: #E8EEF5;
        --color-muted: #A7B6C8;
        --color-accent: #32B8C0;
        --color-border: #304157;
    }
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --color-background: #0D1726;
    --color-surface: #162438;
    --color-heading: #F2F7FC;
    --color-text: #E8EEF5;
    --color-muted: #A7B6C8;
    --color-accent: #32B8C0;
    --color-border: #304157;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    background: var(--color-background);
    color: var(--color-text);
    font-family: var(--font-body);
    line-height: 1.6;
}

.container {
    width: min(100% - 2 * var(--space), 76rem);
    margin-inline: auto;
}

.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
}

.header-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem 2rem;
    padding-block: 1.25rem;
}

a {
    color: var(--color-heading);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.35em;
}

.brand {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    text-decoration: none;
}

.navigation {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem 2rem;
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 0.875rem;
}

.navigation a {
    display: inline-block;
    padding-block: 0.625rem;
    color: var(--color-accent);
    font-weight: 600;
}

a:hover {
    color: var(--color-accent);
}

.future-option {
    display: flex;
    flex-direction: column;
    color: var(--color-muted);
}

.future-option small {
    font-size: 0.6875rem;
}

.appearance {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
}

select {
    min-height: 2.75rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    font: inherit;
    cursor: pointer;
}

a:focus-visible,
select:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
}

.hero {
    max-width: 65rem;
    padding-block: clamp(4rem, 11vw, 9rem);
}

.hero-brand {
    margin-bottom: 1.5rem;
    color: var(--color-heading);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

h1 {
    margin: 0 0 2rem;
    color: var(--color-heading);
    font-size: clamp(2.25rem, 5.5vw, 4.75rem);
    line-height: 1.1;
    letter-spacing: -0.04em;
    text-wrap: balance;
    overflow-wrap: break-word;
}

p { margin: 0; }

.hero-description {
    max-width: 44rem;
    font-size: clamp(1rem, 2vw, 1.25rem);
    line-height: 1.75;
}

.hero-action {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem 1rem;
    margin-top: 2.5rem;
}

.action-link {
    display: inline-block;
    text-decoration: none;
    padding: 0.875rem 1.5rem;
    border: 2px solid var(--color-accent);
    border-radius: var(--radius);
    color: var(--color-heading);
    font-weight: 700;
}

.action-link:hover {
    background: var(--color-surface);
}

.modules {
    padding-bottom: clamp(4rem, 8vw, 6rem);
    scroll-margin-top: 2rem;
}

.modules h2 {
    margin: 0 0 1rem;
    color: var(--color-heading);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    line-height: 1.2;
}

.modules-description {
    max-width: 48rem;
    font-size: 1.125rem;
}

.module-group {
    margin-top: 2.5rem;
}

.module-group h3 {
    margin: 0 0 1rem;
    color: var(--color-heading);
    font-size: 1.25rem;
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.module-card {
    min-width: 0;
    padding: clamp(1.25rem, 3vw, 2rem);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    overflow-wrap: break-word;
}

.module-icon {
    width: 2rem;
    height: 2rem;
    color: var(--color-accent);
}

.module-card h4 {
    margin: 1rem 0 0.5rem;
    color: var(--color-heading);
    font-size: 1.125rem;
}

.how-it-works {
    padding-bottom: clamp(4rem, 8vw, 6rem);
    scroll-margin-top: 2rem;
}

.how-it-works h2 {
    margin: 0 0 1rem;
    color: var(--color-heading);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    line-height: 1.2;
}

.how-it-works-description {
    max-width: 48rem;
    font-size: 1.125rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
    margin: 2.5rem 0 0;
    padding: 0;
    list-style: none;
}

.step {
    min-width: 0;
    padding: clamp(1.25rem, 3vw, 2rem);
    border-top: 1px solid var(--color-border);
    overflow-wrap: break-word;
}

.step-number {
    color: var(--color-accent);
    font-size: 1.75rem;
    font-weight: 700;
}

.step h3 {
    margin: 1rem 0 0.5rem;
    color: var(--color-heading);
    font-size: 1.25rem;
}

@media (max-width: 48rem) {
    .steps {
        grid-template-columns: minmax(0, 1fr);
    }

    .module-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .header-content {
        gap: 1.25rem;
    }

    .header-content nav {
        order: 1;
        flex-basis: 100%;
    }

    .appearance {
        margin-left: auto;
    }

    .navigation {
        gap: 1rem 1.5rem;
    }
}

@media (max-width: 24rem) {
    .appearance {
        gap: 0.375rem;
        flex-direction: column;
        align-items: flex-start;
    }
}

.screenshots {
    padding-bottom: clamp(4rem, 8vw, 6rem);
    scroll-margin-top: 2rem;
}

.screenshots h2 {
    margin: 0 0 1rem;
    color: var(--color-heading);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    line-height: 1.2;
}

.screenshots-description {
    max-width: 48rem;
    font-size: 1.125rem;
}

.screenshot-group { margin-top: 2.5rem; }

.screenshot-group h3 {
    margin: 0 0 0.5rem;
    color: var(--color-heading);
    font-size: 1.25rem;
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.screenshot-grid--admin {
    grid-template-columns: minmax(0, 1fr);
}

.screenshot-card {
    min-width: 0;
    margin: 0;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
}

.screenshot-card--featured { grid-column: 1 / -1; }

.screenshot-link { display: block; }

.screenshot-link img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
}

.screenshot-card figcaption {
    padding: 1rem 0.25rem 0.25rem;
    color: var(--color-heading);
    font-weight: 600;
}

.screenshot-grid--field { max-width: 46rem; }

.screenshot-dialog {
    width: fit-content;
    max-width: calc(100% - 2rem);
    max-height: calc(100dvh - 2rem);
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
}

.screenshot-dialog::backdrop {
    background: var(--color-background);
    opacity: 0.9;
}

.screenshot-dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.screenshot-dialog h2 {
    margin: 0;
    color: var(--color-heading);
    font-size: 1.125rem;
    overflow-wrap: anywhere;
}

.screenshot-close {
    min-height: 2.75rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-accent);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-heading);
    font: inherit;
    cursor: pointer;
}

.screenshot-close:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
}

.screenshot-dialog-content img {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: calc(100dvh - 10rem);
    margin-inline: auto;
    object-fit: contain;
}

@media (max-width: 48rem) {
    .screenshot-grid { grid-template-columns: minmax(0, 1fr); }
    .screenshot-grid--field { max-width: 26rem; }
}