:root {
    color-scheme: light dark;

    --tint: #007aff;
    --tint-soft: rgba(0, 122, 255, 0.12);
    --tint-border: rgba(0, 122, 255, 0.22);

    --bg-grouped: #f2f2f7;
    --bg-elevated: #ffffff;
    --bg-material: rgba(255, 255, 255, 0.78);
    --bg-viewport: #ececef;

    --text-label: rgba(0, 0, 0, 0.88);
    --text-secondary: rgba(60, 60, 67, 0.6);
    --text-tertiary: rgba(60, 60, 67, 0.45);

    --separator: rgba(60, 60, 67, 0.18);
    --shadow-elevated: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);

    --radius-card: 10px;
    --radius-row: 8px;
    --radius-capsule: 999px;

    --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", system-ui, sans-serif;
    --font-text: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-grouped: #000000;
        --bg-elevated: #1c1c1e;
        --bg-material: rgba(28, 28, 30, 0.78);
        --bg-viewport: #111113;

        --text-label: #f5f5f7;
        --text-secondary: rgba(235, 235, 245, 0.6);
        --text-tertiary: rgba(235, 235, 245, 0.38);

        --separator: rgba(84, 84, 88, 0.36);
        --shadow-elevated: 0 1px 2px rgba(0, 0, 0, 0.28), 0 10px 28px rgba(0, 0, 0, 0.32);
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: var(--font-text);
    font-size: 15px;
    line-height: 1.47;
    color: var(--text-label);
    background:
        radial-gradient(circle at top, rgba(0, 122, 255, 0.08), transparent 34%),
        var(--bg-grouped);
}

a {
    color: var(--tint);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.page-shell {
    width: min(760px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 48px;
    animation: pageFadeIn 0.42s ease-out;
}

@keyframes pageFadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 18px;
    padding: 10px 14px;
    border: 1px solid var(--separator);
    border-radius: var(--radius-capsule);
    background: var(--bg-material);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: var(--shadow-elevated);
}

.top-bar-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    color: inherit;
    text-decoration: none;
}

.top-bar-brand:hover {
    text-decoration: none;
}

.top-bar-icon {
    width: 28px;
    height: 28px;
    border-radius: 7px;
    background: url("./macOS512.png") center / cover no-repeat;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.14);
    flex: 0 0 auto;
}

.top-bar-title {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: -0.01em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.top-bar-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius-capsule);
    background: var(--tint-soft);
    color: var(--tint);
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.top-bar .app-store-badge-link {
    flex: 0 0 auto;
}

.top-bar .app-store-badge {
    height: 32px;
}

.hero {
    text-align: center;
    margin-bottom: 22px;
}

.hero-icon {
    width: 88px;
    height: 88px;
    margin: 0 auto 14px;
    border-radius: 20px;
    background: url("./macOS512.png") center / cover no-repeat;
    box-shadow:
        0 10px 24px rgba(0, 0, 0, 0.14),
        0 0 0 1px rgba(255, 255, 255, 0.18) inset;
}

.page-title {
    margin: 0;
    font-family: var(--font-display);
    font-size: clamp(28px, 5vw, 34px);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.08;
}

.page-subtitle {
    margin: 10px auto 0;
    max-width: 34rem;
    color: var(--text-secondary);
    font-size: 15px;
}

.meta-line {
    margin-top: 8px;
    color: var(--text-tertiary);
    font-size: 13px;
}

.callout {
    margin-bottom: 18px;
    padding: 16px 18px;
    border-radius: var(--radius-card);
    border: 1px solid var(--tint-border);
    background:
        linear-gradient(180deg, var(--tint-soft), transparent 120%),
        var(--bg-elevated);
    box-shadow: var(--shadow-elevated);
    text-align: center;
}

.callout p {
    margin: 8px 0 0;
}

.callout strong {
    color: var(--tint);
}

.quick-answer {
    margin: 0 0 18px;
    padding: 16px 18px;
    border-radius: var(--radius-card);
    border: 1px solid var(--tint-border);
    background: var(--bg-elevated);
    box-shadow: var(--shadow-elevated);
}

.quick-answer-label {
    display: block;
    margin-bottom: 8px;
    color: var(--tint);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.quick-answer p {
    margin: 0;
    font-size: 16px;
    line-height: 1.5;
}

.faq-item h3 {
    margin: 0 0 8px;
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-label);
}

.faq-item p {
    margin: 0;
    color: var(--text-secondary);
}

.related-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.related-text-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    height: 40px;
    padding: 0 14px;
    box-sizing: border-box;
    border: 1px solid var(--separator);
    border-radius: var(--radius-row);
    background: var(--bg-viewport);
    font-size: 15px;
    font-weight: 500;
    line-height: 1;
    text-decoration: none;
}

.related-link-icon {
    display: block;
    width: 22px;
    height: 22px;
    border-radius: 5px;
    flex: 0 0 auto;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.related-text-link:hover {
    border-color: var(--tint-border);
    text-decoration: none;
}

.app-store-badge-link {
    display: inline-block;
    line-height: 0;
    text-decoration: none;
}

.app-store-badge-link:hover {
    text-decoration: none;
    opacity: 0.88;
}

.app-store-badge {
    display: block;
    width: auto;
    height: 40px;
}

.related-links a.related-text-link:hover {
    border-color: var(--tint-border);
    text-decoration: none;
}

.section-group {
    margin-bottom: 18px;
}

.section-group-title {
    margin: 0 0 8px 12px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.group-card {
    overflow: hidden;
    border: 1px solid var(--separator);
    border-radius: var(--radius-card);
    background: var(--bg-elevated);
    box-shadow: var(--shadow-elevated);
}

.group-item {
    padding: 16px 18px;
}

.group-item + .group-item {
    border-top: 1px solid var(--separator);
}

.section-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 10px;
    color: var(--tint);
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.section-heading::before {
    content: "";
    width: 0;
    height: 0;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 6px solid currentColor;
}

.group-item p {
    margin: 0 0 10px;
}

.group-item p:last-child {
    margin-bottom: 0;
}

.bullet-list,
.feature-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.bullet-list li,
.feature-list li {
    position: relative;
    margin: 0 0 8px;
    padding-left: 22px;
}

.bullet-list li::before,
.feature-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--tint);
    transform: translateY(-50%);
}

.feature-list li strong {
    color: var(--text-label);
}

.spec-list {
    display: grid;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.spec-item {
    display: flex;
    gap: 8px;
    align-items: flex-start;
}

.spec-item::before {
    content: "•";
    color: var(--tint);
    font-weight: 700;
    line-height: 1.2;
}

.contact-panel {
    text-align: center;
}

.contact-panel p {
    margin: 0 0 10px;
}

.contact-panel p:last-child {
    margin-bottom: 0;
}

code {
    padding: 0.12em 0.38em;
    border-radius: 6px;
    background: var(--bg-viewport);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.92em;
}

.page-footer {
    margin-top: 24px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 12px;
}

.page-footer p {
    margin: 0;
}

.page-footer-legal {
    margin-top: 10px;
    width: 100%;
    line-height: 1.45;
}

@media (max-width: 640px) {
    .page-shell {
        width: min(100%, calc(100% - 20px));
        padding-top: 18px;
    }

    .top-bar {
        flex-direction: column;
        align-items: stretch;
        border-radius: var(--radius-card);
    }

    .top-bar-pill {
        justify-content: center;
    }

    .top-bar .app-store-badge-link {
        align-self: center;
    }

    .hero-icon {
        width: 76px;
        height: 76px;
        border-radius: 18px;
    }
}