.timeline-section {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('assets/images/Buraidah3.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    padding: 0;
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-align: center;
    padding: 2rem 0 1rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #6b7280;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.content-section {
    padding: 3rem 0;
    background: white;
}

.content-section.alt-bg {
    background: var(--bg-light);
}

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

.program-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.program-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.program-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.speaker-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.speaker-name-item {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
}

/* ===== Detailed Program 導覽：dp-* 全新選擇器 ===== */
:root {
    --dp-accent: var(--primary-color, #2563eb);
    --dp-ink: var(--text-color, #1f2937);
    --dp-bg: #fff;
    --dp-muted: #64748b;
    --dp-nav-h: 64px;
}

.dp-nav {
    padding-top: 40px;
}

.dp-nav-inner {
    height: var(--dp-nav-h);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 8px;
}

.dp-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 40px;
    padding: 0 14px;
    white-space: nowrap;
    border-radius: 999px;
    border: 1px solid #6b7280;
    background: #fff;
    text-decoration: none;
    color: var(--dp-ink);
    font-weight: 700;
    font-size: 20px;
    transition: transform .15s ease, border-color .15s ease, background .15s ease, box-shadow .15s ease;
}

.dp-chip:hover {
    transform: translateY(-1px);
    border-color: #cbd5e1;
}

/* 行動裝置優化 */
@media (max-width: 800px) {
    .dp-nav-inner {
        flex-wrap: wrap;
        height: auto;
    }

    .dp-chip {
        display: block;
    }
}