/* ============================================
   RESEARCH PORTFOLIO — Page-Specific Styles
   ============================================ */

/* ========== PAGE HERO ========== */
.page-hero {
    position: relative;
    padding: 160px 0 80px;
    overflow: hidden;
    background: linear-gradient(180deg, var(--clr-bg-primary) 0%, var(--clr-bg-secondary) 100%);
}

.page-hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.page-hero-bg .shape-1 {
    width: 600px;
    height: 600px;
    background: rgba(147, 51, 234, 0.07);
    top: -20%;
    right: -10%;
    border-radius: 50%;
    filter: blur(100px);
    position: absolute;
}

.page-hero-bg .shape-2 {
    width: 400px;
    height: 400px;
    background: rgba(219, 39, 119, 0.05);
    bottom: -20%;
    left: -10%;
    border-radius: 50%;
    filter: blur(80px);
    position: absolute;
}

.page-hero-content {
    max-width: 700px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--fs-small);
    color: var(--clr-text-muted);
    margin-bottom: var(--space-xl);
}

.breadcrumb a {
    color: var(--clr-text-secondary);
    transition: color var(--transition-base);
}

.breadcrumb a:hover {
    color: var(--clr-accent-1);
}

.breadcrumb svg {
    width: 14px;
    height: 14px;
}

.breadcrumb span {
    color: var(--clr-accent-1);
}

.page-hero-title {
    font-size: var(--fs-h1);
    font-weight: 800;
    margin-bottom: var(--space-lg);
    line-height: 1.15;
}

.page-hero-subtitle {
    font-size: 1.125rem;
    color: var(--clr-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-2xl);
}

.page-hero-stats {
    display: flex;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.ph-stat {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--fs-small);
    color: var(--clr-text-secondary);
    padding: 10px 18px;
    background: var(--clr-bg-glass);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-full);
    backdrop-filter: blur(8px);
}

.ph-stat i,
.ph-stat svg {
    width: 16px;
    height: 16px;
    color: var(--clr-accent-1);
}

.ph-stat strong {
    color: var(--clr-text-primary);
    font-weight: 700;
}

/* ========== CATEGORY HEADERS ========== */
.category-header {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
    margin-top: var(--space-4xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--clr-border);
}

.category-header:first-child {
    margin-top: 0;
}

.category-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.1), rgba(147, 51, 234, 0.04));
    border: 1px solid rgba(147, 51, 234, 0.15);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.category-icon svg {
    width: 24px;
    height: 24px;
    color: var(--clr-accent-1);
}

.icon-engineering {
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.1), rgba(8, 145, 178, 0.04));
    border-color: rgba(8, 145, 178, 0.15);
}

.icon-engineering svg {
    color: var(--clr-accent-4);
}

.icon-collab {
    background: linear-gradient(135deg, rgba(219, 39, 119, 0.1), rgba(219, 39, 119, 0.04));
    border-color: rgba(219, 39, 119, 0.15);
}

.icon-collab svg {
    color: var(--clr-accent-2);
}

.category-title {
    font-size: var(--fs-h3);
    font-weight: 700;
    margin-bottom: 4px;
}

.category-desc {
    font-size: var(--fs-small);
    color: var(--clr-text-muted);
}

/* ========== RESEARCH PROJECTS SECTION ========== */
.research-projects {
    padding: var(--space-4xl) 0;
}

.projects-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

/* ========== RESEARCH CARD ========== */
.research-card {
    display: grid;
    grid-template-columns: 380px 1fr;
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.research-card:hover {
    border-color: var(--clr-border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.research-card:hover::before {
    opacity: 1;
}

/* Card Image */
.research-card-image {
    position: relative;
    overflow: hidden;
    min-height: 260px;
}

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

.research-card:hover .research-card-image img {
    transform: scale(1.05);
}

.card-year {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-full);
    font-size: var(--fs-xs);
    font-weight: 600;
    color: var(--clr-accent-1);
    letter-spacing: 1px;
}

/* Card Content */
.research-card-content {
    padding: var(--space-2xl);
    display: flex;
    flex-direction: column;
}

.card-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: var(--space-md);
}

.meta-tag {
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--fs-xs);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.meta-it {
    background: rgba(147, 51, 234, 0.08);
    border: 1px solid rgba(147, 51, 234, 0.15);
    color: var(--clr-accent-1);
}

.meta-eng {
    background: rgba(8, 145, 178, 0.08);
    border: 1px solid rgba(8, 145, 178, 0.15);
    color: var(--clr-accent-4);
}

.meta-hack {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.meta-collab {
    background: rgba(219, 39, 119, 0.08);
    border: 1px solid rgba(219, 39, 119, 0.15);
    color: var(--clr-accent-2);
}

.meta-misc {
    background: rgba(79, 70, 229, 0.08);
    border: 1px solid rgba(79, 70, 229, 0.15);
    color: var(--clr-accent-3);
}

.card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 6px;
    line-height: 1.3;
}

.card-subtitle {
    font-size: var(--fs-small);
    color: var(--clr-accent-1);
    font-weight: 500;
    margin-bottom: var(--space-md);
    opacity: 0.85;
}

.card-description {
    font-size: var(--fs-small);
    color: var(--clr-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

/* Card Features */
.card-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: var(--space-xl);
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: var(--fs-xs);
    color: var(--clr-text-secondary);
    line-height: 1.5;
}

.feature i,
.feature svg {
    width: 14px;
    height: 14px;
    color: #22c55e;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Card Actions */
.card-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: auto;
    flex-wrap: wrap;
}

.btn-sm {
    padding: 10px 20px;
    font-size: var(--fs-small);
}

.btn-sm svg,
.btn-sm i {
    width: 16px;
    height: 16px;
}

.btn-lg {
    padding: 18px 40px;
    font-size: 1.05rem;
}

/* ========== CTA SECTION ========== */
.research-cta {
    padding: var(--space-4xl) 0 var(--space-3xl);
}

.cta-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2xl);
    padding: var(--space-3xl) var(--space-4xl);
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.06), rgba(219, 39, 119, 0.04));
    border: 1px solid rgba(147, 51, 234, 0.12);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(147, 51, 234, 0.06), transparent 70%);
    pointer-events: none;
}

.cta-content h2 {
    font-size: var(--fs-h3);
    margin-bottom: var(--space-sm);
}

.cta-content p {
    font-size: var(--fs-body);
    color: var(--clr-text-secondary);
    max-width: 500px;
}

/* ========== RESPONSIVE ========== */

@media (max-width: 1024px) {
    .research-card {
        grid-template-columns: 300px 1fr;
    }

    .page-hero-stats {
        gap: var(--space-md);
    }
}

@media (max-width: 768px) {
    .page-hero {
        padding: 120px 0 60px;
    }

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

    .research-card-image {
        min-height: 200px;
        max-height: 240px;
    }

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

    .category-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }

    .cta-box {
        flex-direction: column;
        text-align: center;
        padding: var(--space-2xl);
    }

    .cta-content p {
        margin: 0 auto;
    }

    .page-hero-stats {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .ph-stat {
        width: fit-content;
    }
}

@media (max-width: 480px) {
    .research-card-content {
        padding: var(--space-lg);
    }

    .card-actions {
        flex-direction: column;
    }

    .card-actions .btn {
        width: 100%;
        justify-content: center;
    }
}