:root {
    --bg-top: #5EC6F5;
    --bg-bottom: #2B8BD1;
    --primary: #0284C7;
    --primary-deep: #0A6091;
    --accent: #F59E0B;
    --text: #0B1A2B;
    --text-muted: #63758E;
    --surface: #FFFFFF;
    --divider: #E0EDF9;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-top: #081521;
        --bg-bottom: #0F1E32;
        --primary: #38BDF8;
        --primary-deep: #7DD3FC;
        --accent: #FBBF24;
        --text: #E6F0F9;
        --text-muted: #8FA2B8;
        --surface: #142338;
        --divider: #1E2E44;
    }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
    min-height: 100vh;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

header {
    padding: 48px 24px 32px;
    text-align: center;
    color: #FFFFFF;
}
header .icon {
    width: 96px;
    height: 96px;
    border-radius: 22px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
    margin-bottom: 18px;
}
header h1 {
    margin: 0 0 6px;
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
}
header p {
    margin: 0;
    font-size: 16px;
    opacity: 0.9;
}
nav {
    text-align: center;
    padding: 0 16px 32px;
}
nav a {
    display: inline-block;
    color: #FFFFFF;
    text-decoration: none;
    padding: 8px 14px;
    margin: 4px;
    font-size: 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    transition: background 0.15s;
}
nav a:hover { background: rgba(255, 255, 255, 0.28); }
nav a.active { background: rgba(255, 255, 255, 0.35); font-weight: 600; }

main {
    max-width: 720px;
    margin: 0 auto 64px;
    padding: 0 20px;
}
.card {
    background: var(--surface);
    border-radius: 20px;
    padding: 32px 28px;
    box-shadow: 0 16px 48px rgba(11, 26, 43, 0.15);
}
.card h2 {
    margin: 0 0 6px;
    font-size: 26px;
    color: var(--text);
    letter-spacing: -0.3px;
}
.card .updated {
    margin: 0 0 28px;
    font-size: 13px;
    color: var(--text-muted);
}
.card h3 {
    margin: 28px 0 10px;
    font-size: 18px;
    color: var(--text);
}
.card p, .card li {
    color: var(--text);
    font-size: 15px;
}
.card a { color: var(--primary); text-decoration: none; }
.card a:hover { text-decoration: underline; }
.lang-divider {
    margin: 40px 0;
    border: 0;
    border-top: 1px solid var(--divider);
}
.lang-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin: 0 0 4px;
}
footer {
    text-align: center;
    padding: 0 16px 40px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
}
footer a { color: rgba(255, 255, 255, 0.95); }
.cta {
    display: inline-block;
    background: #FFFFFF;
    color: var(--primary-deep);
    padding: 14px 28px;
    border-radius: 999px;
    font-weight: 600;
    text-decoration: none;
    margin-top: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}