* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #ffffff;
    color: #333333;
}

.hero {
    background: linear-gradient(135deg, #1f2937, #0f172a 55%, #111827);
    color: white;
    padding: 44px 20px 36px;
}

.hero h1 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.25rem);
    line-height: 1.02;
    max-width: 10ch;
}

.hero p {
    margin-top: 12px;
    max-width: 700px;
    line-height: 1.6;
    font-size: 1rem;
}

.eyebrow {
    margin: 0 0 10px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.78rem;
    color: #a5b4fc;
}

.container {
    width: min(1100px, calc(100% - 40px));
    margin: 0 auto;
}

section {
    margin: 54px auto;
    background: transparent;
}

h2 {
    margin-bottom: 20px;
    font-size: clamp(1.5rem, 2.6vw, 2.2rem);
}

p {
    line-height: 1.8;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    background: #f5f5f5;
    padding: 24px;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(15, 23, 42, 0.06);
}

.card h3 {
    margin-top: 0;
}

.viewer {
    margin-top: 24px;
    width: 100%;
    aspect-ratio: 16 / 9;
    max-height: calc(100vh - var(--viewer-vertical-gap, 140px));
    border-radius: 12px;
    overflow: hidden;
    background-color: transparent;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
}

@media (orientation: portrait) {
    .viewer {
        aspect-ratio: 3 / 4;
    }
}

.viewer iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

ul {
    padding-left: 20px;
    line-height: 1.8;
}

li {
    margin: 10px 0;
}

footer {
    margin-top: 80px;
    padding: 32px 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    background: linear-gradient(135deg, #1f2937, #0f172a 55%, #111827);
    color: #9aa3b2;
    font-size: 15px;
}

footer .container {
    margin: 0 auto;
}

footer a {
    color: #d7dee8;
    text-decoration: none;
    transition: color 0.2s;
}

footer a:hover {
    color: #ffffff;
}