/* ── Canvas ── */
#ecoli-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ── Hero ── */
.hero {
    height: calc(100vh - 60px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 40px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 4em;
    margin-bottom: 0.25em;
    letter-spacing: -0.01em;
}

.hero .subtitle {
    font-size: 1.35em;
    color: rgb(70, 70, 70);
    margin-bottom: 1em;
}

.hero .tagline {
    font-size: 1.05em;
    color: rgb(95, 95, 95);
    font-style: italic;
    max-width: 540px;
    line-height: 1.65;
}

/* ── Home content (below hero) ── */
.home-intro {
    text-align: center;
}

.home-intro p {
    font-size: 1.05em;
    line-height: 1.85;
    color: rgb(50, 50, 50);
    max-width: 680px;
    margin: 0 auto 1.4em;
}

.text-link {
    color: black;
    font-size: 1em;
    font-style: italic;
    text-underline-offset: 3px;
    transition: color 0.25s;
}

.text-link:hover {
    color: #5c8e56;
}

/* ── Section divider ── */
.section-rule {
    border: none;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    margin: 30px 0;
}

/* ── Nav cards ── */
.card-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.nav-card {
    display: block;
    text-decoration: none;
    color: black;
    border: 1px solid rgba(0, 0, 0, 0.15);
    padding: 28px 30px;
    transition: border-color 0.25s ease, transform 0.2s ease;
}

.nav-card:hover {
    border-color: #5c8e56;
    transform: translateY(-2px);
}

.nav-card-icon {
    display: block;
    font-size: 1.5em;
    color: #5c8e56;
    margin-bottom: 0.5em;
}

.nav-card h3 {
    font-size: 1.35em;
    margin-bottom: 0.35em;
}

.nav-card p {
    font-size: 0.95em;
    color: rgb(75, 75, 75);
    line-height: 1.6;
    font-style: italic;
}

/* ── Mobile ── */
@media (max-width: 660px) {
    .hero h1 {
        font-size: 2.8em;
    }

    .hero .subtitle {
        font-size: 1.1em;
    }

    .hero .tagline {
        font-size: 0.98em;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 420px) {
    .hero {
        padding: 0 20px;
    }

    .hero h1 {
        font-size: 2.2em;
    }

    .hero .subtitle {
        font-size: 1em;
    }
}