:root {
    color-scheme: light dark;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.5;
    --background: #f7f4ef;
    --surface: #ffffff;
    --text: #172026;
    --muted: #5f6972;
    --accent: #0b6bcb;
    --accent-strong: #074f97;
    --accent-tint: rgba(11, 107, 203, 0.10);
    --border: #d9dfd5;
    --shadow: 0 20px 50px rgba(23, 32, 38, 0.12);
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        linear-gradient(120deg, rgba(11, 107, 203, 0.08), transparent 32%),
        linear-gradient(240deg, rgba(22, 121, 88, 0.10), transparent 36%),
        var(--background);
    color: var(--text);
}

main {
    width: min(1000px, calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0 56px;
}

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

p {
    margin: 0 0 16px;
}

/* ---------- Top nav ---------- */

.site-nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: color-mix(in srgb, var(--background) 92%, transparent);
    backdrop-filter: saturate(150%) blur(10px);
    border-bottom: 1px solid var(--border);
}

.site-nav-inner {
    width: min(1000px, calc(100% - 32px));
    margin: 0 auto;
    padding: 14px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    font-weight: 700;
    text-decoration: none;
    color: var(--text);
    letter-spacing: 0.01em;
}

.brand:hover {
    color: var(--accent-strong);
}

.nav-apps {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-app {
    position: relative;
}

.nav-app > summary {
    list-style: none;
    cursor: pointer;
    user-select: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 8px;
    font-weight: 600;
    color: var(--text);
}

.nav-app > summary::-webkit-details-marker {
    display: none;
}

.nav-app > summary::after {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg) translate(-2px, -2px);
    transition: transform 160ms ease;
}

.nav-app[open] > summary::after {
    transform: rotate(-135deg) translate(-2px, -2px);
}

.nav-app > summary:hover,
.nav-app[open] > summary {
    background: var(--accent-tint);
    color: var(--accent-strong);
}

.nav-app-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    padding: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-app-menu a {
    display: block;
    padding: 10px 12px;
    border-radius: 6px;
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
}

.nav-app-menu a:hover {
    background: var(--accent-tint);
    color: var(--accent-strong);
}

/* ---------- Home hero ---------- */

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    gap: 24px;
    align-items: stretch;
}

.intro,
.app-panel,
.utility-links,
.content-card {
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.intro {
    padding: clamp(28px, 5vw, 56px);
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 18px;
    color: var(--accent-strong);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
}

.eyebrow::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: #167958;
}

h1 {
    max-width: 11ch;
    margin: 0 0 18px;
    font-size: clamp(2.6rem, 7vw, 5.2rem);
    line-height: 0.95;
    letter-spacing: 0;
}

.lead {
    max-width: 620px;
    color: var(--muted);
    font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.actions,
.links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    min-height: 44px;
    padding: 0 18px;
    border: 1px solid var(--accent);
    border-radius: 8px;
    background: var(--accent);
    color: #ffffff;
    font-weight: 700;
    text-decoration: none;
}

.button.secondary {
    background: transparent;
    color: var(--accent-strong);
}

.app-panel {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 32px;
    min-height: 360px;
    padding: 28px;
    background: #172026;
    color: #f7f4ef;
    border-color: rgba(255, 255, 255, 0.18);
}

.app-icon {
    display: block;
    width: 72px;
    height: 72px;
    border-radius: 18px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.app-panel h2,
.utility-links h2 {
    margin: 22px 0 10px;
    font-size: 1.6rem;
    letter-spacing: 0;
}

.app-panel p {
    color: #dbe2e7;
}

.app-panel .button {
    width: 100%;
    margin-top: 20px;
    background: #f7f4ef;
    border-color: #f7f4ef;
    color: #172026;
}

.utility-links {
    margin-top: 24px;
    padding: 24px 28px;
}

.utility-links h2 {
    margin-top: 0;
    font-size: 1.1rem;
}

.utility-links p {
    color: var(--muted);
}

.links {
    margin-top: 16px;
}

/* ---------- Long-form content pages ---------- */

.content-card {
    padding: clamp(28px, 5vw, 56px);
}

.content-card h1 {
    max-width: none;
    font-size: clamp(2rem, 4.6vw, 3rem);
    line-height: 1.05;
}

.content-card h2 {
    margin: 2rem 0 0.5rem;
    font-size: 1.4rem;
    letter-spacing: 0;
}

.content-card h3 {
    margin: 1.4rem 0 0.4rem;
    font-size: 1.05rem;
    color: var(--text);
    font-weight: 600;
}

.content-card p,
.content-card ul {
    color: var(--muted);
}

.content-card ul {
    padding-left: 1.4rem;
    margin: 0 0 0.75rem;
}

.content-card ul li {
    margin-bottom: 0.35rem;
}

.content-card strong {
    color: var(--text);
}

.content-card .subtitle {
    color: var(--muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.section-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}

.badge {
    display: inline-block;
    background: var(--accent-tint);
    color: var(--accent-strong);
    font-size: 0.72rem;
    font-weight: 700;
    border-radius: 6px;
    padding: 0.18rem 0.55rem;
    margin-right: 0.5rem;
    vertical-align: middle;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.callout {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--accent-tint);
    border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
    border-radius: 10px;
    text-align: center;
}

.callout p {
    color: var(--text);
    margin-bottom: 0.5rem;
}

.callout .button {
    margin-top: 0.5rem;
}

.content-footer {
    font-size: 0.8rem;
    color: var(--muted);
    text-align: center;
    margin-top: 2.5rem;
}

/* ---------- App landing page ---------- */

.nav-right {
    display: flex;
    align-items: center;
    gap: 4px;
}

.lang-select > summary {
    font-size: 0.85rem;
}

.nav-app-menu a[aria-current="true"] {
    background: var(--accent-tint);
    color: var(--accent-strong);
}

.landing-hero {
    padding: clamp(32px, 6vw, 64px);
    text-align: center;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.landing-hero .app-icon {
    width: 96px;
    height: 96px;
    border-radius: 22px;
    margin: 0 auto 24px;
}

.landing-hero h1 {
    max-width: none;
    margin: 0 auto 18px;
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    line-height: 1.02;
}

.landing-hero .lead {
    margin-left: auto;
    margin-right: auto;
}

.landing-hero .actions {
    justify-content: center;
}

.store-note {
    margin: 14px 0 0;
    font-size: 0.85rem;
    color: var(--muted);
}

.landing-section {
    margin-top: 40px;
}

.landing-section > h2 {
    margin: 0;
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    text-align: center;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.feature {
    padding: 22px;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 1.6rem;
    line-height: 1;
}

.feature h3 {
    margin: 12px 0 6px;
    font-size: 1.05rem;
}

.feature p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 24px;
    counter-reset: step;
}

.step {
    padding: 22px;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.step::before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 999px;
    background: var(--accent);
    color: #ffffff;
    font-weight: 700;
}

.step h3 {
    margin: 12px 0 6px;
    font-size: 1.05rem;
}

.step p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

/* ---------- Redirect notice (used in old repo stubs) ---------- */

.redirect-card {
    width: min(520px, calc(100% - 32px));
    margin: 14vh auto 0;
    padding: 32px;
    text-align: center;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* ---------- Dark mode ---------- */

@media (prefers-color-scheme: dark) {
    :root {
        --background: #11161a;
        --surface: #172026;
        --text: #f7f4ef;
        --muted: #c4cbd0;
        --accent: #6bb6ff;
        --accent-strong: #9fd0ff;
        --accent-tint: rgba(107, 182, 255, 0.14);
        --border: #35404a;
        --shadow: 0 20px 50px rgba(0, 0, 0, 0.32);
    }

    .intro,
    .utility-links,
    .content-card,
    .redirect-card,
    .landing-hero,
    .feature,
    .step {
        background: rgba(23, 32, 38, 0.88);
    }

    .step::before {
        color: #08131f;
    }

    .button:not(.secondary) {
        color: #08131f;
    }
}

/* ---------- Mobile ---------- */

@media (max-width: 760px) {
    main {
        padding: 24px 0;
    }

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

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

    .app-panel {
        min-height: auto;
    }

    .actions,
    .links {
        flex-direction: column;
    }

    .button {
        width: 100%;
        box-sizing: border-box;
    }
}

@media (max-width: 480px) {
    .site-nav-inner {
        padding: 12px 0;
    }

    .nav-app > summary {
        padding: 8px 10px;
    }

    .nav-app-menu {
        right: auto;
        left: 0;
    }

    .lang-select .nav-app-menu {
        right: 0;
        left: auto;
        min-width: 170px;
    }
}