:root {
    --bg: #f5f7fa;
    --surface: #ffffff;
    --text: #1f2937;
    --muted: #667085;
    --accent: #d32027;
    --accent-dark: #ad171d;
    --border: #e4e7ec;
    --shadow: 0 18px 50px rgba(16, 24, 40, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--bg);
}
a { color: inherit; }
.page-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 48px 0 72px;
}
.hero, .videos {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.hero { padding: clamp(24px, 4vw, 48px); }
.hero-copy { margin-bottom: 28px; }
.eyebrow {
    display: inline-block;
    margin-bottom: 4px;
    color: var(--accent);
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
    font-size: .78rem;
}
h1, h2 { margin: 0; line-height: 1.1; }
h1 { font-size: clamp(2rem, 5vw, 3.8rem); }
.lead { margin: 12px 0 0; color: var(--muted); font-size: 1.05rem; }
.viewer-frame {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #fff;
}
.viewer-frame img {
    display: block;
    width: 100%;
    height: auto;
}
.downloads {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 24px;
}
.download-button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 54px;
    padding: 12px 18px;
    border-radius: 12px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    font-weight: 750;
    text-align: center;
    transition: transform .15s ease, background .15s ease;
}
.download-button:hover { background: var(--accent-dark); transform: translateY(-1px); }
.videos { margin-top: 24px; padding: clamp(24px, 4vw, 40px); }
.videos h2 { margin-bottom: 18px; font-size: clamp(1.5rem, 3vw, 2.2rem); }
.video-list { display: grid; gap: 10px; }
.video-card {
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #fff;
    line-height: 1.45;
}
.video-card a { color: #b42318; font-weight: 700; text-decoration: none; }
.video-card a:hover { text-decoration: underline; }
@media (max-width: 720px) {
    .page-shell { width: min(100% - 20px, 1180px); padding-top: 20px; }
    .hero { padding: 20px; }
    .downloads { grid-template-columns: 1fr; }
}