:root {
    --dark: #2c2c25;
    --muted: #6a6a6a;
    --gold: #d4af37;
    --gold-dark: #b8942d;
    --soft: #f6f6f6;
    --white: #ffffff;
}

/* ---- Global Text ---- */
h1, h2, h3 {
    color: var(--dark);
    font-weight: 800;
}

p {
    color: var(--muted);
    line-height: 1.7;
}

/* ===========================================================
    SECTION 1
=========================================================== */
h1 {
    text-align: center;
    margin-top: 40px;
    font-size: 2.6rem;
}

h1 + p {
    max-width: 720px;
    margin: 20px auto 40px;
    text-align: center;
    font-size: 1.15rem;
}

/* ===========================================================
    SECTION 2
=========================================================== */
.white-papers {
    padding: 70px 40px;
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.papers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 36px;
}

.paper-card {
    background: var(--white);
    border-radius: 14px;
    border: 1px solid rgba(212,175,55,0.25);
    overflow: hidden;
    box-shadow: 0 8px 22px rgba(0,0,0,0.06);
    transition: transform .3s ease, box-shadow .3s ease;
}

.paper-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 28px rgba(0,0,0,0.10);
}

.paper-image img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    display: block;
}

.paper-content {
    padding: 28px;
}

.paper-content h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    line-height: 1.4;
}

.paper-description {
    margin-bottom: 20px;
    font-size: 0.98rem;
}

.paper-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn {
    padding: 12px 18px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.95rem;
    text-align: center;
    display: block;
    transition: background .25s ease, transform .2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

/* Gold theme buttons */
.abstract-btn {
    background: var(--gold);
    color: var(--white);
}

.abstract-btn:hover {
    background: var(--gold-dark);
}

.download-btn {
    background: #f1f1f1;
    color: var(--dark);
}

.download-btn:hover {
    background: #888888;
}

.white-papers + p {
    max-width: 720px;
    margin: 50px auto 80px;
    text-align: center;
    font-size: 1.05rem;
}

@media (max-width: 992px) {
    .papers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .white-papers {
        padding: 40px 20px;
    }
    .papers-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    .paper-image img {
        height: 250px;
    }
}