/* ========================================
   HOME PAGE
   ======================================== */

/* ----- HERO ----- */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

#hero-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: var(--space-9) 0;
}

.hero-title {
    font-size: var(--text-7xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--letter-spacing-tight);
    line-height: var(--line-height-tight);
    color: var(--color-white);
    margin-bottom: var(--space-4);
    max-width: 900px;
}

.hero-subtitle {
    font-size: var(--text-xl);
    font-weight: var(--font-weight-regular);
    color: var(--color-muted);
    line-height: var(--line-height-relaxed);
    max-width: 600px;
    margin-bottom: var(--space-9);
}

/* Scroll Indicator */
.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    opacity: 0.4;
    animation: scrollBreathe 3s ease-in-out infinite;
}

.scroll-line {
    display: block;
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--color-muted), transparent);
}

.scroll-label {
    font-size: var(--text-xs);
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
}

@keyframes scrollBreathe {
    0%, 100% {
        opacity: 0.4;
        transform: translateY(0);
    }
    50% {
        opacity: 0.8;
        transform: translateY(4px);
    }
}

/* ----- ABOUT ----- */
.about {
    padding: var(--space-9) 0;
    border-top: 1px solid var(--color-border);
}

.about-content {
    max-width: 760px;
}

.about-text {
    font-size: var(--text-xl);
    color: var(--color-muted);
    line-height: var(--line-height-relaxed);
}

/* ----- CURRENT RESEARCH ----- */
.current-research {
    padding: var(--space-9) 0;
    border-top: 1px solid var(--color-border);
}

.research-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    max-width: 760px;
}

.research-card {
    background: var(--color-background-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: all var(--transition-duration-base) var(--transition-ease);
    cursor: pointer;
}

.research-card:hover {
    border-color: var(--color-border-hover);
    background: var(--color-background-surface-hover);
}

.research-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.research-tag {
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    background: rgba(37, 99, 237, 0.12);
    padding: 2px var(--space-2);
    border-radius: var(--radius-full);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

.research-name {
    font-size: var(--text-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
}

.research-summary {
    font-size: var(--text-lg);
    color: var(--color-muted);
    margin-bottom: var(--space-4);
}

.research-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-duration-slow) var(--transition-ease);
}

.research-card.expanded .research-details {
    max-height: 600px;
}

.research-detail-item {
    margin-top: var(--space-4);
}

.detail-label {
    display: block;
    font-size: var(--text-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin-bottom: var(--space-1);
}

.detail-text {
    font-size: var(--text-base);
    color: var(--color-white);
}

.progress-bar {
    width: 100%;
    height: 3px;
    background: var(--color-background);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-duration-slow) var(--transition-ease);
}

.related-pubs {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.related-pubs a {
    font-size: var(--text-sm);
    color: var(--color-muted);
}

.related-pubs a:hover {
    color: var(--color-primary);
}

.research-expand-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: none;
    border: none;
    color: var(--color-muted);
    font-family: var(--font-family);
    font-size: var(--text-sm);
    cursor: pointer;
    padding: var(--space-2) 0;
    margin-top: var(--space-3);
    transition: color var(--transition-duration-fast) var(--transition-ease);
}

.research-expand-btn:hover {
    color: var(--color-white);
}

.btn-icon {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--transition-duration-fast) var(--transition-ease);
}

.research-card.expanded .btn-icon {
    transform: rotate(-135deg);
}

/* ----- PUBLICATIONS PREVIEW ----- */
.publications-preview {
    padding: var(--space-9) 0;
    border-top: 1px solid var(--color-border);
}

.pubs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.view-all {
    font-size: var(--text-sm);
    color: var(--color-muted);
}

.view-all:hover {
    color: var(--color-white);
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-4);
}

.publication-card {
    background: var(--color-background-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    transition: all var(--transition-duration-base) var(--transition-ease);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.publication-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

.publication-date {
    font-size: var(--text-xs);
    color: var(--color-muted);
    letter-spacing: var(--letter-spacing-wide);
}

.publication-title {
    font-size: var(--text-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    line-height: var(--line-height-tight);
}

.publication-description {
    font-size: var(--text-sm);
    color: var(--color-muted);
    line-height: var(--line-height-relaxed);
    flex-grow: 1;
}

.publication-link {
    font-size: var(--text-sm);
    color: var(--color-primary);
    align-self: flex-start;
}

.publication-link:hover {
    color: var(--color-electric);
}

.publications-loading {
    display: flex;
    gap: var(--space-2);
    justify-content: center;
    padding: var(--space-6);
}

.loading-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--color-muted);
    border-radius: 50%;
    animation: loadingDot 1.4s ease-in-out infinite;
}

.loading-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes loadingDot {
    0%, 80%, 100% {
        transform: scale(0.6);
        opacity: 0.3;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.publications-error {
    text-align: center;
    padding: var(--space-6);
    color: var(--color-muted);
}

/* ----- EXPLORE ----- */
.explore {
    padding: var(--space-9) 0;
    border-top: 1px solid var(--color-border);
}

.explore-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.explore-card {
    background: var(--color-background-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    text-align: center;
    transition: all var(--transition-duration-base) var(--transition-ease);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
}

.explore-card:hover {
    border-color: var(--color-border-hover);
    background: var(--color-background-surface-hover);
    transform: translateY(-4px);
}

.explore-illustration {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.explore-illustration svg {
    width: 100%;
    height: 100%;
}

.explore-title {
    font-size: var(--text-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
}

.explore-description {
    font-size: var(--text-sm);
    color: var(--color-muted);
    line-height: var(--line-height-relaxed);
}

/* ----- RESPONSIVE ----- */

@media (max-width: 1024px) {
    .explore-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-title {
        font-size: var(--text-5xl);
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--text-base);
    }
    
    .explore-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-3);
    }
    
    .explore-card {
        padding: var(--space-3);
    }
    
    .explore-illustration {
        width: 60px;
        height: 60px;
    }
    
    .explore-title {
        font-size: var(--text-base);
    }
    
    .publications-grid {
        grid-template-columns: 1fr;
    }
    
    .research-card {
        padding: var(--space-4);
    }
    
    .research-name {
        font-size: var(--text-xl);
    }
    
    .pubs-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
}

@media (max-width: 480px) {
    .explore-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2);
    }
    
    .explore-card {
        padding: var(--space-2);
    }
    
    .explore-illustration {
        width: 48px;
        height: 48px;
    }
}
/* ----- UTILITY ADDITIONS ----- */
.section-intro {
    max-width: 60ch;
    margin: 0 0 var(--space-6);
    font-size: var(--text-base);
    color: var(--color-muted);
    line-height: var(--line-height-relaxed);
}

.explore-link {
    display: inline-block;
    margin-top: auto;
    font-size: var(--text-sm);
    letter-spacing: var(--letter-spacing-wide);
    color: var(--color-primary);
    opacity: 0.85;
    transition: opacity var(--transition-duration-fast) var(--transition-ease);
}

.explore-card:hover .explore-link {
    opacity: 1;
}

.about-text--lead {
    font-size: var(--text-2xl);
    color: var(--color-white);
    opacity: 0.95;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary);
    color: var(--color-white);
    z-index: 9999;
    font-size: var(--text-sm);
}

.skip-link:focus {
    left: var(--space-4);
    top: var(--space-4);
}