@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@400;700&family=Open+Sans:wght@300;400;600&display=swap');

*, *::before, *::after {
    box-sizing: border-box;
}

body, html {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    background-color: #f0f8ff;
    color: #2f4f4f;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ── Waves background ──────────────────────────────────────────────── */

.waves {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* ── Header ─────────────────────────────────────────────────────────── */

.site-header {
    position: sticky;
    top: 0;
    width: 100%;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    z-index: 10;
}

.site-header .logo {
    font-family: 'Merriweather', serif;
    font-size: 1.5rem;
    letter-spacing: 0.05em;
    background: linear-gradient(to right, #87cefa, #4682b4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
}

.nav-link {
    font-weight: 600;
    text-decoration: none;
    color: #4682b4;
    padding: 8px 16px;
    border: 2px solid #4682b4;
    border-radius: 4px;
    transition: background-color 0.3s, color 0.3s;
}

.nav-link:hover, .nav-link:focus {
    background-color: #4682b4;
    color: white;
}

/* ── Hero ───────────────────────────────────────────────────────────── */

.hero {
    text-align: center;
    padding: 12vh 20px 4vh;
    position: relative;
    z-index: 10;
}

.hero h2 {
    font-family: 'Merriweather', serif;
    font-size: clamp(2rem, 6vw, 5rem);
    margin: 0.5em 0;
}

.hero p {
    max-width: 680px;
    margin: 0 auto;
    color: #708090;
    font-size: 1.25rem;
    line-height: 1.6;
}

/* ── Cards ──────────────────────────────────────────────────────────── */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    padding: 4vh 20px;
    position: relative;
    z-index: 10;
}

.card {
    padding: 35px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
    backdrop-filter: blur(6px);
}

.card:hover {
    transform: translateY(-5px);
}

.card .label {
    color: #87cefa;
    font-weight: bold;
    margin-bottom: 10px;
}

.card h3 {
    font-family: 'Merriweather', serif;
    font-size: 1.5rem;
    margin: 0 0 10px;
}

.card p {
    margin: 0;
    line-height: 1.6;
}

/* ── CTA ────────────────────────────────────────────────────────────── */

.cta {
    text-align: center;
    padding: 4vh 20px;
    position: relative;
    z-index: 10;
}

.signal-status {
    margin: 0;
    font-size: 1rem;
    letter-spacing: 0.15em;
    color: #708090;
}

.signal-cta {
    display: inline-block;
    margin: 10px 0;
    padding: 12px 24px;
    font-weight: 600;
    text-decoration: none;
    color: white;
    background-color: #4682b4;
    border-radius: 4px;
    transition: background-color 0.3s;
    border: none;
}

.signal-cta:hover, .signal-cta:focus {
    background-color: #2f4f4f;
}

.signal-sub {
    margin: 0;
    font-size: 1.25rem;
    color: #2f4f4f;
}

@media (max-width: 480px) {
    .hero {
        padding: 10vh 10px 3vh;
    }

    .hero p {
        font-size: 1rem;
    }

    .cards {
        padding: 3vh 10px;
    }

    .cta {
        padding: 3vh 10px;
    }
}