/* ====================================
   Section-Specific Layouts
   ==================================== */

/* --- SECTION 1: HERO --- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 0;
    position: relative;
}

.hero__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    max-width: 800px;
}

.hero__status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.hero__status .status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulse-dot 2s ease-in-out infinite;
}

.hero__headline {
    font-size: clamp(2.2rem, 5.5vw, 3.8rem);
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.hero__sub {
    font-family: var(--font-sans);
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 550px;
}

.hero__cta-group {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.hero__scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-dim);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    animation: float-hint 3s ease-in-out infinite;
}

.hero__scroll-hint svg {
    width: 16px;
    height: 16px;
    stroke: var(--text-dim);
}

/* --- SECTION 2: RESEARCH --- */
#research {
    min-height: 100vh;
}

.research__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.research__paper-title {
    font-family: var(--font-sans);
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    font-weight: 500;
    color: var(--text-primary);
    font-style: italic;
    margin-bottom: 2rem;
    max-width: 700px;
    line-height: 1.6;
}

.research__paper-title::before {
    content: '"';
    color: var(--accent-active);
    font-size: 1.5em;
    transition: color var(--transition-med);
}

.research__paper-title::after {
    content: '"';
    color: var(--accent-active);
    font-size: 1.5em;
    transition: color var(--transition-med);
}

/* Comparison Slider */
.comparison-slider {
    position: relative;
    width: 100%;
    max-width: 900px;
    aspect-ratio: 16 / 7;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    cursor: col-resize;
    margin: 2rem 0 3rem;
    background: var(--bg-surface);
}

.comparison-slider__panel {
    position: absolute;
    top: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 2rem 3rem;
}

.comparison-slider__panel--left {
    left: 0;
    right: 50%;
    background: linear-gradient(135deg, #1a0a0a, #0a0a0f);
    border-right: none;
    overflow: hidden;
}

.comparison-slider__panel--right {
    left: 50%;
    right: 0;
    background: linear-gradient(135deg, #0a0a0f, #0a1a0a);
    overflow: hidden;
}

.comparison-slider__panel-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 0.75rem;
}

.comparison-slider__panel--left .comparison-slider__panel-label {
    color: #ef4444;
}

.comparison-slider__panel--right .comparison-slider__panel-label {
    color: #22c55e;
}

.comparison-slider__model-name {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.comparison-slider__response {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border-left: 2px solid;
    max-height: 120px;
    overflow: hidden;
}

.comparison-slider__panel--left .comparison-slider__response {
    border-color: #ef4444;
}

.comparison-slider__panel--right .comparison-slider__response {
    border-color: #22c55e;
}

.comparison-slider__divider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 3px;
    background: var(--accent-active);
    z-index: 5;
    transform: translateX(-50%);
    transition: background var(--transition-med);
}

.comparison-slider__handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-active);
    border: 3px solid var(--bg-primary);
    z-index: 6;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 20px var(--glow-active);
    transition: background var(--transition-med), box-shadow var(--transition-med);
}

.comparison-slider__handle svg {
    width: 16px;
    height: 16px;
    fill: var(--bg-primary);
}

/* Metrics Row */
.metrics-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.metric-card {
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    backdrop-filter: blur(20px);
    transition: all var(--transition-med);
}

.metric-card:hover {
    border-color: var(--border-light);
}

.metric-card__value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.metric-card__value--danger {
    color: #ef4444;
}

.metric-card__value--success {
    color: #22c55e;
}

.metric-card__value--accent {
    color: var(--accent-active);
    transition: color var(--transition-med);
}

.metric-card__label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-dim);
}

.metric-card__sublabel {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 0.25rem;
}

/* --- SECTION 3: PORTFOLIO --- */
#portfolio {
    min-height: auto;
    padding-bottom: 2rem;
}

/* Category group layout */
.portfolio__category {
    margin-bottom: 4rem;
    position: relative;
}

.portfolio__category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.portfolio__category-header--right {
    flex-direction: row-reverse;
    text-align: right;
}

.portfolio__category-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-active);
    opacity: 0.15;
    line-height: 1;
    transition: color var(--transition-med);
}

.portfolio__category-title {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.portfolio__category-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--accent-active), transparent);
    transition: background var(--transition-med);
}

.portfolio__category-header--right .portfolio__category-line {
    background: linear-gradient(270deg, var(--accent-active), transparent);
}

.portfolio__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    padding: 0;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all var(--transition-med);
    overflow: hidden;
    position: relative;
    cursor: pointer;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-light), transparent);
}

.project-card::after {
    content: 'Click to explore →';
    position: absolute;
    bottom: 1rem;
    right: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.project-card:hover::after {
    opacity: 1;
}

.project-card:hover {
    border-color: var(--accent-active);
    transform: translateY(-6px) perspective(1000px) rotateX(2deg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px var(--glow-active);
}

.project-card--featured {
    border-color: var(--accent-active);
    box-shadow: 0 0 20px var(--glow-active);
}

.project-card__featured-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 2;
}

.project-card__visual {
    height: 200px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-card__visual svg {
    width: 100%;
    height: 100%;
}

.project-card__body {
    padding: 1.75rem;
}

.project-card__number {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent-active);
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
    transition: color var(--transition-med);
}

.project-card__title {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.project-card__desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.project-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* --- SECTION 4: EXPERIENCE & PUBLICATIONS --- */
#experience {
    min-height: 100vh;
}

.experience__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 2rem;
}

@media (max-width: 900px) {
    .experience__grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 2.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-active), var(--border), transparent);
    transition: background var(--transition-med);
}

.timeline__item {
    position: relative;
    padding-bottom: 2.5rem;
}

.timeline__item:last-child {
    padding-bottom: 0;
}

.timeline__dot {
    position: absolute;
    left: -2.5rem;
    top: 0.25rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-active);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 10px var(--glow-active);
    transform: translateX(-5px);
    transition: all var(--transition-med);
}

.timeline__item--current .timeline__dot {
    animation: pulse-dot 2s ease-in-out infinite;
}

.timeline__date {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-active);
    letter-spacing: 0.1em;
    margin-bottom: 0.25rem;
    transition: color var(--transition-med);
}

.timeline__role {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.timeline__company {
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
}

.timeline__desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Publications */
.publications {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.pub-card {
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    backdrop-filter: blur(20px);
    transition: all var(--transition-med);
}

.pub-card:hover {
    border-color: var(--border-light);
    transform: translateX(4px);
}

.pub-card__icon {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.pub-card__title {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.pub-card__venue {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-bottom: 0.75rem;
}

.pub-card__doi {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-cyan);
    padding: 0.25rem 0.75rem;
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 100px;
    background: var(--glow-cyan);
}

.pub-card__doi:hover {
    border-color: var(--accent-cyan);
    opacity: 1;
}

/* --- SECTION 5: CONSOLE (SKILLS) --- */
#console {
    min-height: 100vh;
}

.terminal {
    max-width: 750px;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-surface);
    box-shadow: var(--shadow-card);
}

.terminal__titlebar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.terminal__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.terminal__dot--red { background: #ef4444; }
.terminal__dot--yellow { background: #f59e0b; }
.terminal__dot--green { background: #22c55e; }

.terminal__title {
    flex: 1;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
}

.terminal__body {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.8;
    min-height: 400px;
    overflow: hidden;
}

.terminal__prompt {
    color: var(--accent-cyan);
}

.terminal__command {
    color: var(--text-primary);
}

.terminal__output {
    margin-top: 0.5rem;
}

.terminal__key {
    color: var(--accent-cyan);
}

.terminal__value {
    color: var(--accent-active);
    transition: color var(--transition-med);
}

.terminal__bracket {
    color: var(--text-dim);
}

.terminal__comment {
    color: var(--text-dim);
    font-style: italic;
}

.terminal__cursor {
    display: inline-block;
    width: 8px;
    height: 1.1em;
    background: var(--accent-active);
    vertical-align: text-bottom;
    animation: cursor-blink 1s step-end infinite;
    transition: background var(--transition-med);
}

/* --- SECTION 6: CONTACT --- */
#contact {
    min-height: 80vh;
}

.contact__terminal {
    max-width: 700px;
}

.contact__links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.contact__link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    background: var(--bg-surface);
}

.contact__link:hover {
    border-color: var(--accent-active);
    color: var(--accent-active);
    background: var(--glow-active);
    opacity: 1;
    transform: translateY(-2px);
}

.contact__link svg {
    width: 16px;
    height: 16px;
}

/* --- FOOTER --- */
.footer {
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* --- Neural Network Navigation --- */
.nav-neural {
    position: fixed;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.nav-neural__svg {
    width: 50px;
    height: 320px;
}

.nav-neural__node {
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-neural__node circle.node-core {
    fill: var(--bg-elevated);
    stroke: var(--text-dim);
    stroke-width: 1.2;
    transition: all var(--transition-med);
}

.nav-neural__node:hover circle.node-core {
    stroke: var(--text-secondary);
    fill: var(--bg-surface);
    r: 7;
}

.nav-neural__node.active circle.node-core {
    fill: var(--accent-active);
    stroke: var(--accent-active);
    filter: drop-shadow(0 0 6px var(--glow-active));
    r: 7;
    transition: all var(--transition-med);
}

.nav-neural__node circle.node-pulse {
    fill: none;
    stroke: var(--accent-active);
    stroke-width: 0.5;
    opacity: 0;
    transition: opacity var(--transition-med);
}

.nav-neural__node.active circle.node-pulse {
    opacity: 0.4;
    animation: neural-pulse 2s ease-in-out infinite;
}

.nav-neural__connection {
    stroke: var(--border);
    stroke-width: 0.8;
    fill: none;
    transition: stroke var(--transition-med);
}

.nav-neural__connection.active {
    stroke: var(--accent-active);
    opacity: 0.4;
    filter: drop-shadow(0 0 3px var(--glow-active));
}

/* Data flow particles on connections */
.nav-neural__particle {
    fill: var(--accent-active);
    opacity: 0;
    r: 1.2;
}

.nav-neural__particle.active {
    opacity: 0.8;
    animation: data-flow 2s linear infinite;
}

.nav-neural__label {
    font-family: var(--font-mono);
    font-size: 5.5px;
    fill: var(--text-dim);
    text-anchor: end;
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.nav-neural__node:hover ~ .nav-neural__label,
.nav-neural__node.active ~ .nav-neural__label {
    opacity: 1;
}

/* Show label on hover via group */
.nav-neural__group:hover .nav-neural__label {
    opacity: 1;
}

.nav-neural__group .nav-neural__label {
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.nav-neural__group.active-group .nav-neural__label {
    opacity: 1;
    fill: var(--accent-active);
}

@keyframes neural-pulse {
    0%, 100% { r: 10; opacity: 0.3; }
    50% { r: 15; opacity: 0; }
}

@keyframes data-flow {
    0% { offset-distance: 0%; opacity: 0; }
    10% { opacity: 0.8; }
    90% { opacity: 0.8; }
    100% { offset-distance: 100%; opacity: 0; }
}

@media (max-width: 768px) {
    .nav-neural {
        display: none;
    }
}

/* --- Easter egg banana --- */
.hidden-banana {
    position: fixed;
    z-index: 50;
    cursor: pointer;
    opacity: 0.04;
    transition: opacity 0.3s ease;
    font-size: 2rem;
    user-select: none;
    pointer-events: all;
}

.hidden-banana:hover {
    opacity: 0.15;
}

/* --- MODAL OVERLAY --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 500;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s var(--ease-out-expo);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-overlay.active .modal-panel {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.modal-panel {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-lg);
    max-width: 800px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 3rem;
    position: relative;
    transform: translateY(30px) scale(0.97);
    opacity: 0;
    transition: all 0.5s var(--ease-out-expo);
}

.modal-panel::-webkit-scrollbar {
    width: 4px;
}

.modal-panel::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 2px;
}

.modal-close {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
    z-index: 10;
}

.modal-close:hover {
    border-color: var(--accent-active);
    color: var(--accent-active);
    background: var(--glow-active);
}

.modal__header {
    margin-bottom: 1.5rem;
}

.modal__number {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent-active);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 0.5rem;
}

.modal__title {
    font-family: var(--font-mono);
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 0.75rem;
}

.modal__desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.modal__section {
    margin-bottom: 2rem;
}

.modal__subtitle {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 1rem;
}

.modal__highlights {
    list-style: none;
    padding: 0;
}

.modal__highlights li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

.modal__highlights li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-active);
    font-family: var(--font-mono);
}

.modal__metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.modal__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.modal__actions {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
    .modal-panel {
        padding: 2rem 1.5rem;
        max-height: 90vh;
    }
}