/* FLEX Project Page - Series Section Styles */

/* ========================================
   FLEX Research Series Section
   ======================================== */
.series-section {
    background: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);
    padding: 4rem 0;
}

.series-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
}

.series-intro p {
    font-size: 1.125rem;
    color: #4b5563;
    line-height: 1.7;
}

/* Series Navigation Tabs */
.series-tabs {
    display: none; /* Hidden for now - will be shown when multiple works are added */
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.series-tab {
    padding: 0.75rem 1.5rem;
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 600;
    color: #6b7280;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.series-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.series-tab.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.tab-icon {
    font-size: 1.25rem;
}

/* Series Grid */
.series-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

/* Series Work Card */
.series-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
}

.series-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

/* Card Header */
.series-card-header {
    position: relative;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f8fafc 0%, #f0f9ff 100%);
    border-bottom: 2px solid #e5e7eb;
}

.card-header-top {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.series-status {
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-published {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
}

.status-preprint {
    background: linear-gradient(135deg, #fed7aa 0%, #fdba74 100%);
    color: #92400e;
}

.status-in-progress {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1e40af;
}

.status-planned {
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
    color: #4b5563;
}

.series-domain-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.series-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

/* Card Body */
.series-card-body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.series-card-description {
    color: #4b5563;
    line-height: 1.6;
    margin-bottom: 1rem;
    flex: 1;
}

.series-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid #e5e7eb;
    font-size: 0.875rem;
    color: #6b7280;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.meta-icon {
    font-size: 1rem;
}

/* Card Preview Image */
.series-card-preview {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.series-card-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.series-card:hover .series-card-preview img {
    transform: scale(1.1);
}

.preview-placeholder {
    font-size: 4rem;
    opacity: 0.3;
}

/* Card Footer */
.series-card-footer {
    padding: 1rem 1.5rem;
    background: #f9fafb;
    border-top: 1px solid #e5e7eb;
}

.series-card-links {
    display: flex;
    gap: 1rem;
}

.card-link {
    flex: 1;
    padding: 0.6rem 1rem;
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-color);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.card-link:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.card-link.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

/* Domain Color Accents */
.series-card[data-domain="mathematics"] {
    border-top: 4px solid var(--math-color);
}

.series-card[data-domain="chemistry"] {
    border-top: 4px solid var(--chemistry-color);
}

.series-card[data-domain="biology"] {
    border-top: 4px solid var(--biology-color);
}

.series-card[data-domain="methodology"] {
    border-top: 4px solid var(--methodology-color);
}

.series-card[data-domain="applications"] {
    border-top: 4px solid var(--applications-color);
}

.series-card[data-domain="theory"] {
    border-top: 4px solid var(--theory-color);
}

/* Core FLEX Highlight */
.series-card.core-work {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 3px solid var(--primary-color);
    box-shadow: 0 8px 16px rgba(37, 99, 235, 0.2);
}

.series-card.core-work::before {
    content: '⭐ Foundational Work';
    position: absolute;
    top: 0;
    right: 0;
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #78350f;
    padding: 0.4rem 1rem;
    border-bottom-left-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Empty State */
.series-empty {
    text-align: center;
    padding: 4rem 2rem;
    color: #9ca3af;
}

.series-empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.series-empty p {
    font-size: 1.125rem;
    margin-bottom: 0;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .series-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .series-tabs {
        flex-direction: column;
        max-width: 300px;
        margin-left: auto;
        margin-right: auto;
    }

    .series-tab {
        width: 100%;
        justify-content: center;
    }

    .series-card-links {
        flex-direction: column;
    }
}