/* ============================================================
   index.html — Oil & Gas Value Chain page
   Shared header/nav/palette lives in css/theme.css
   ============================================================ */

body {
    font-family: var(--font-body);
    background: var(--bg-page);
    margin: 40px;
    color: var(--ink);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
}

.accordion {
    max-width: 900px;
    margin: auto;
}

.accordion-btn {
    width: 100%;
    padding: 15px;
    margin-top: 8px;
    border: none;
    background: var(--navy-mid);
    color: var(--ink-light);
    font-size: 18px;
    text-align: left;
    cursor: pointer;
    border-radius: 4px;
}

.accordion-btn:hover {
    background: var(--navy-hover);
}

.panel {
    display: none;
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 20px;
}

.panel h3 {
    color: var(--navy-mid);
    margin-bottom: 5px;
}

.panel p,
.panel li {
    line-height: 1.6;
}

.panel ul {
    margin-bottom: 20px;
}