:root {
    --navy: #142a43;
    --blue: #21658f;
    --blue-soft: #7eabbf;
    --green: #238b66;
    --orange: #d48334;
    --ink: #24384b;
    --muted: #6f8295;
    --line: #dbe4eb;
    --surface: #ffffff;
    --background: #f2f6f9;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    background: var(--background);
    font-family: "Segoe UI", Arial, sans-serif;
}

.page-shell { min-height: 100vh; }

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(340px, .75fr);
    gap: 48px;
    padding: 72px max(5vw, 32px);
    background: linear-gradient(125deg, var(--navy) 0%, #193a5c 56%, #21658f 100%);
}

.brand-panel { display: flex; flex-direction: column; justify-content: space-between; min-height: 410px; }
.brand-logo { width: min(520px, 90%); height: auto; object-fit: contain; object-position: left center; }
.brand-copy { max-width: 720px; color: white; }
.eyebrow { display: block; color: #86c4db; font-size: .82rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.brand-copy h1 { margin: 12px 0 14px; font-size: clamp(2.8rem, 6vw, 5.7rem); line-height: .95; letter-spacing: -.04em; }
.brand-copy p { margin: 0; max-width: 650px; color: #d4e2ed; font-size: clamp(1rem, 1.6vw, 1.25rem); line-height: 1.6; }

.download-card {
    align-self: center;
    padding: 34px;
    background: rgba(255,255,255,.98);
    border-radius: 4px;
    box-shadow: 0 26px 70px rgba(3, 17, 31, .28);
}

.app-heading { display: flex; align-items: center; gap: 18px; padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.app-heading img { width: 72px; height: 72px; border-radius: 14px; }
.app-heading span { color: var(--muted); font-size: .9rem; }
.app-heading h2 { margin: 4px 0 0; color: var(--navy); font-size: 1.65rem; }

.file-info { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 26px 0; }
.file-info div { padding: 14px; background: var(--background); }
.file-info dt { color: var(--muted); font-size: .72rem; font-weight: 700; text-transform: uppercase; }
.file-info dd { margin: 5px 0 0; color: var(--navy); font-weight: 650; }

.download-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    padding: 17px 22px;
    color: white;
    background: var(--green);
    border: 0;
    border-radius: 2px;
    text-decoration: none;
    cursor: pointer;
    transition: transform .2s ease, background .2s ease;
}
.download-button:hover { background: #197754; transform: translateY(-2px); }
.download-button span { font-size: 1.08rem; font-weight: 700; }
.download-button small { margin-top: 4px; color: #d8f2e8; }
.download-button.disabled { background: #91a0ad; cursor: not-allowed; }
.download-button.disabled:hover { transform: none; }
.status { margin: 15px 0 0; color: var(--muted); font-size: .85rem; text-align: center; }
.status span { display: inline-block; width: 8px; height: 8px; margin-right: 6px; border-radius: 50%; }
.status.available span { background: var(--green); }
.status.unavailable span { background: var(--orange); }

.content-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; padding: 0 max(5vw, 32px); background: var(--line); }
.content-grid article { position: relative; min-height: 215px; padding: 42px; background: white; }
.number { color: var(--blue); font-size: .78rem; font-weight: 750; letter-spacing: .12em; }
.content-grid h3 { margin: 24px 0 10px; color: var(--navy); font-size: 1.35rem; }
.content-grid p { margin: 0; color: var(--muted); line-height: 1.65; }

.requirements { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; padding: 64px max(5vw, 32px); background: white; }
.requirements h2 { margin: 10px 0 0; color: var(--navy); font-size: clamp(1.8rem, 3vw, 2.7rem); }
.requirements ul { margin: 0; padding: 0; list-style: none; }
.requirements li { padding: 12px 0 12px 28px; border-bottom: 1px solid var(--line); color: var(--muted); line-height: 1.5; }
.requirements li::before { content: "✓"; float: left; margin-left: -28px; color: var(--green); font-weight: 800; }

footer { display: flex; align-items: center; gap: 16px; padding: 28px max(5vw, 32px); color: #b9cad8; background: var(--navy); }
footer img { width: 42px; height: 42px; }
footer p { margin: 0; line-height: 1.45; }
footer span { margin-left: auto; font-size: .85rem; }

@media (max-width: 900px) {
    .hero { grid-template-columns: 1fr; padding-top: 42px; }
    .brand-panel { min-height: 330px; }
    .content-grid { grid-template-columns: 1fr; }
    .requirements { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 560px) {
    .hero { padding: 28px 18px 38px; gap: 28px; }
    .brand-panel { min-height: 260px; }
    .brand-logo { width: 100%; }
    .download-card { padding: 24px; }
    .file-info { grid-template-columns: 1fr; }
    .content-grid { padding: 0 18px; background: transparent; gap: 12px; }
    .content-grid article { min-height: auto; padding: 30px; }
    .requirements { padding: 46px 24px; }
    footer { align-items: flex-start; flex-wrap: wrap; padding: 26px 24px; }
    footer span { width: 100%; margin: 10px 0 0; }
}