/* ===========================================================
   04 · SECTIONS — about, work, stack, research, contact
   =========================================================== */

/* ----- Parallax Utility ----- */
.parallax-el {
    transform: translate3d(var(--px, 0px), var(--py, 0px), 0px);
    will-change: transform;
}


/* ----- Section head ----- */
.section__head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(28px, 5vw, 60px);
    align-items: center;
    margin-bottom: clamp(40px, 6vw, 68px);
    padding-bottom: var(--s-34);
    border-bottom: 1px solid var(--color-white-08);
}

.surface--light .section__head {
    border-color: var(--color-obsidian-08);
}

.section__head-left {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.section__index {
    font-size: 15px;
    font-weight: var(--weight-bold);
    letter-spacing: 0.06em;
    color: var(--color-desert-sienna);
    text-transform: uppercase;
}

.section__title {
    font-size: var(--text-heading-lg);
    line-height: var(--leading-heading-lg);
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-heading-lg);
    color: var(--color-canvas-white);
}

.section__title--dark {
    color: var(--color-obsidian);
}

.section__art {
    width: clamp(120px, 14vw, 200px);
    height: auto;
    flex-shrink: 0;
    will-change: transform;
    transform: translate3d(0, 0, 0);
}

.section__art img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.7s var(--ease-out);
}

.section__art:hover img {
    transform: rotate(-6deg) scale(1.04);
}

.section__art--right {
    justify-self: end;
}

.section__body {
    max-width: 720px;
    margin: 0 0 clamp(40px, 6vw, 68px);
    font-size: 17px;
    line-height: 1.61;
    color: var(--color-slate-mist);
    letter-spacing: 0.17px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.section__body--dark {
    color: var(--color-slate-mist);
}

.surface--light .section__body--dark {
    color: var(--color-slate-mist);
}

.section__body p {
    color: inherit;
}

/* ----- Feature grid (About stats) ----- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--s-23);
    margin-top: clamp(40px, 6vw, 68px);
}


.feature {
    background: var(--color-canvas-white);
    color: var(--color-obsidian);
    border-radius: var(--radius-card);
    padding: var(--card-padding);
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-height: 280px;
    transition: opacity var(--t-base) var(--ease), background var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
    cursor: none;
    position: relative;
    overflow: hidden;
    will-change: transform;
    transform-style: preserve-3d;
    transform: perspective(1200px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)) translateY(var(--py, 0px)) translateX(var(--px, 0px));
}


.feature::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, transparent 30%, var(--color-desert-sienna) 100%);
    border-radius: inherit;
    opacity: 0;
    transition: opacity var(--t-slow) var(--ease);
    z-index: 0;
}

.feature::after {
    content: '';
    position: absolute;
    inset: 1px;
    background: var(--color-canvas-white);
    border-radius: calc(var(--radius-card) - 1px);
    z-index: 0;
    transition: background var(--t-slow) var(--ease);
}

.feature>* {
    position: relative;
    z-index: 1;
}

.feature:hover::before {
    opacity: 0.5;
}

.feature__num {
    font-size: clamp(48px, 6vw, 72px);
    line-height: 1;
    font-weight: var(--weight-bold);
    letter-spacing: -0.025em;
    color: var(--color-obsidian);
    margin-top: auto;
    font-variant-numeric: tabular-nums;
}

.feature__title {
    font-size: 23px;
    line-height: 1.20;
    font-weight: var(--weight-bold);
    letter-spacing: -0.01em;
    color: var(--color-obsidian);
}

.feature__desc {
    font-size: 17px;
    line-height: 1.45;
    color: var(--color-slate-mist);
    letter-spacing: 0.17px;
}

.feature__foot {
    font-size: 13px;
    font-weight: var(--weight-medium);
    letter-spacing: 0.08em;
    color: var(--color-obsidian);
    text-transform: uppercase;
    margin-top: 6px;
    padding-top: 14px;
    border-top: 1px solid var(--color-obsidian-08);
    display: flex;
    justify-content: space-between;
    align-items: center;
}


.feature__foot::after {
    content: '→';
    color: var(--color-desert-sienna);
    transition: transform var(--t-slow) var(--ease);
}

.feature:hover .feature__foot::after {
    transform: translateX(4px);
}

/* ----- Project list (Work) ----- */
.horizontal-scroll-section {
    height: fit-content;
    /* Will be adjusted by JS, but good fallback */
    position: relative;
    padding: 0;
    margin: 0;
    /* CRITICAL: override .surface overflow:hidden — it breaks position:sticky */
    overflow: visible !important;
}

.horizontal-scroll-section>.section {
    padding-bottom: 0;
}

.horizontal-scroll-sticky {
    position: sticky;
    top: 0;
    /* Will be set dynamically by JS */
    height: fit-content;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    overflow: hidden;
    margin: 0;
}

.horizontal-scroll-track {
    width: 100%;
    margin-top: 0;
    padding-bottom: clamp(60px, 8vw, 120px);
}

/* Progress bar at bottom of sticky viewport */
.horizontal-scroll-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-obsidian-08);
    z-index: 10;
    pointer-events: none;
}

.horizontal-scroll-progress__fill {
    height: 100%;
    width: 0%;
    background: var(--color-desert-sienna);
    border-radius: var(--radius-pill);
    transition: none;
    will-change: width;
}

.project-list {
    display: flex;
    flex-direction: row;
    gap: clamp(40px, 6vw, 100px);
    width: max-content;
    padding-right: var(--gutter);
    will-change: transform;
    transition: transform 0.05s linear;
    margin: 0px var(--gutter);
}

.project {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: clamp(300px, 35vw, 480px);
    padding: 0 0 0 clamp(20px, 3vw, 32px);
    border-left: 1px solid var(--color-obsidian-08);
    border-bottom: none;
    transition: border-color var(--t-slow) var(--ease), padding-left var(--t-slow) var(--ease);
    position: relative;
    cursor: none;
    align-items: flex-start;
}

.project::before {
    content: '';
    display: block;
    width: clamp(32px, 3.4vw, 44px);
    height: 2px;
    background: var(--color-desert-sienna);
    margin-bottom: 4px;
    border-radius: var(--radius-pill);
    transition: width var(--t-slow) var(--ease);
}

.project:hover::before {
    width: clamp(56px, 5vw, 72px);
}

.project:hover {
    padding-left: clamp(28px, 3.5vw, 40px);
    border-color: var(--color-desert-sienna);
}

.project>* {
    position: relative;
    z-index: 1;
}

.project__num {
    font-size: 15px;
    font-weight: var(--weight-bold);
    letter-spacing: 0.08em;
    color: var(--color-desert-sienna);
    padding-top: 8px;
    transition: transform var(--t-slow) var(--ease);
}

.project:hover .project__num {
    transform: scale(1.1);
    transform-origin: left;
}

.project__art {
    width: clamp(72px, 6.8vw, 100px);
    height: auto;
    flex-shrink: 0;
    transition: transform var(--t-slow) var(--ease);
}

.project__art img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s var(--ease-out);
}

.project:hover .project__art img {
    transform: rotate(-4deg) scale(1.04);
}

.project__main {
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-width: 740px;
}

.project__head {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
}

.project__title {
    font-size: clamp(30px, 3.6vw, 42px);
    line-height: 1.05;
    font-weight: var(--weight-bold);
    letter-spacing: -0.02em;
    color: var(--color-obsidian);
    transition: color var(--t-slow) var(--ease),
        letter-spacing var(--t-slow) var(--ease);
}

.project:hover .project__title {
    color: var(--color-desert-sienna);
    letter-spacing: -0.025em;
}

.project__tag {
    display: inline-block;
    font-size: 13px;
    font-weight: var(--weight-medium);
    letter-spacing: 0.06em;
    color: var(--color-slate-mist);
    text-transform: uppercase;
    padding: 6px 12px;
    border: 1px solid var(--color-obsidian-08);
    border-radius: var(--radius-pill);
    transition: border-color var(--t-slow) var(--ease);
}

.project:hover .project__tag {
    border-color: var(--color-obsidian-12);
}

.project__desc {
    font-size: 17px;
    line-height: 1.55;
    color: var(--color-slate-mist);
    letter-spacing: 0.17px;
}

.project__chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 4px;
}

.project__chips span {
    font-size: 13px;
    font-weight: var(--weight-medium);
    letter-spacing: 0.04em;
    color: var(--color-obsidian);
    padding: 6px 12px;
    background: var(--color-obsidian-04);
    border-radius: var(--radius-pill);
    transition: background var(--t-slow) var(--ease),
        color var(--t-slow) var(--ease);
}

.project:hover .project__chips span:hover {
    background: var(--color-obsidian);
    color: var(--color-canvas-white);
}

.project__year {
    font-size: 17px;
    font-weight: var(--weight-bold);
    color: var(--color-obsidian);
    text-align: left;
    letter-spacing: 0.04em;
    margin-top: auto;
    padding-top: 16px;
}

/* ----- Stack list (editorial, no progress bars) ----- */
.stack-list {
    margin-top: clamp(20px, 4vw, 40px);
    border-top: 1px solid var(--color-white-08);
}

.stack-row {
    display: grid;
    grid-template-columns: 50px minmax(0, 180px) minmax(0, 1fr);
    gap: clamp(16px, 3vw, 40px);
    align-items: baseline;
    padding: 28px 0;
    border-bottom: 1px solid var(--color-white-08);
    position: relative;
    cursor: none;
    transition: padding-left 0.35s var(--ease);
}

.stack-row::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-desert-sienna);
    transform: scaleY(0);
    transform-origin: top center;
    transition: transform 0.4s var(--ease-out);
    pointer-events: none;
}

.stack-row:hover {
    padding-left: 12px;
}

.stack-row:hover::before {
    transform: scaleY(1);
}

.stack-row>* {
    position: relative;
    z-index: 1;
}

.stack-row__num {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: var(--weight-medium);
    color: var(--color-desert-sienna);
    letter-spacing: 0.06em;
    padding-top: 4px;
}

.stack-row__label {
    font-size: 14px;
    font-weight: var(--weight-bold);
    color: var(--color-canvas-white);
    letter-spacing: 0.10em;
    text-transform: uppercase;
    padding-top: 4px;
}

.stack-row__tools {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0;
    font-size: clamp(20px, 2vw, 28px);
    font-weight: var(--weight-medium);
    color: var(--color-slate-mist);
    line-height: 1.45;
    letter-spacing: -0.01em;
}

.stack-row__tools li {
    cursor: none;
    padding: 2px 14px 2px 0;
    margin-right: 14px;
    border-bottom: 1px solid transparent;
    transition: color 0.3s var(--ease),
        border-color 0.3s var(--ease),
        letter-spacing 0.3s var(--ease);
    position: relative;
}

.stack-row__tools li:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--color-slate-mist);
    opacity: 0.4;
}

.stack-row__tools li:hover {
    color: var(--color-canvas-white);
    border-bottom-color: var(--color-desert-sienna);
    letter-spacing: 0.01em;
}

/* ----- Disclosures (Research) ----- */
.disclosures {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--s-23);
    margin-top: clamp(20px, 4vw, 40px);
}

.disclosure {
    background: var(--color-obsidian);
    color: var(--color-canvas-white);
    border-radius: var(--radius-card);
    padding: var(--card-padding);
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 300px;
    transition: opacity 0.3s var(--ease), background 0.3s var(--ease), box-shadow 0.3s var(--ease);
    cursor: none;
    position: relative;
    overflow: hidden;
}


.disclosure::after {
    content: '';
    position: absolute;
    top: -40px;
    right: -40px;
    width: 120px;
    height: 120px;
    border: 1.5px solid var(--color-desert-sienna);
    border-radius: 50%;
    opacity: 0.6;
    transition: transform var(--t-slow) var(--ease);
    z-index: 0;
    pointer-events: none;
}

.disclosure:hover::after {
    transform: scale(1.15) rotate(45deg);
}

.disclosure__top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-white-08);
}

.disclosure__target {
    font-size: 15px;
    font-weight: var(--weight-bold);
    letter-spacing: 0.04em;
    color: var(--color-canvas-white);
    text-transform: uppercase;
}

.disclosure__status {
    font-size: 12px;
    font-weight: var(--weight-bold);
    letter-spacing: 0.10em;
    color: var(--color-desert-sienna);
    padding: 5px 10px;
    border: 1px solid var(--color-desert-sienna);
    border-radius: var(--radius-pill);
    text-transform: uppercase;
    transition: background var(--t-slow) var(--ease), color var(--t-slow) var(--ease);
}

.disclosure:hover .disclosure__status {
    background: var(--color-desert-sienna);
    color: var(--color-canvas-white);
}

.disclosure__title {
    font-size: 23px;
    line-height: 1.2;
    font-weight: var(--weight-bold);
    color: var(--color-canvas-white);
    letter-spacing: -0.01em;
}

.disclosure__desc {
    font-size: 17px;
    line-height: 1.55;
    color: var(--color-slate-mist);
    letter-spacing: 0.17px;
}

.disclosure__foot {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 13px;
    font-weight: var(--weight-medium);
    letter-spacing: 0.06em;
    color: var(--color-slate-mist);
    text-transform: uppercase;
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--color-white-08);
}

.disclosure__foot .dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--color-slate-mist);
}

/* ----- Contact ----- */
.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 60px);
    align-items: start;
    margin-top: clamp(20px, 4vw, 40px);
}

.contact-list,
.social-list {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--color-white-08);
}

.surface--light .contact-list,
.surface--light .social-list {
    border-color: var(--color-obsidian-08);
}

.contact-row {
    display: grid;
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 18px;
    align-items: center;
    padding: 22px 0;
    border-bottom: 1px solid var(--color-white-08);
    transition: padding-left var(--t-slow) var(--ease);
}

.surface--light .contact-row {
    border-color: var(--color-obsidian-08);
}

.contact-row:hover {
    padding-left: 8px;
}

.contact-row__label {
    font-size: 13px;
    font-weight: var(--weight-bold);
    letter-spacing: 0.10em;
    color: var(--color-slate-mist);
    text-transform: uppercase;
}

.contact-row__value {
    position: relative;
    display: inline-block;
    font-size: clamp(20px, 2.2vw, 27px);
    line-height: 1.15;
    font-weight: var(--weight-bold);
    letter-spacing: -0.01em;
    color: var(--color-canvas-white);
    width: fit-content;
    transition: color var(--t-slow) var(--ease);
}

.surface--light .contact-row__value {
    color: var(--color-obsidian);
}

.contact-row__value::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: var(--color-desert-sienna);
    transform: scaleX(0);
    transform-origin: right center;
    transition: transform var(--t-slow) var(--ease);
    border-radius: var(--radius-pill);
}

.contact-row__value:hover {
    /* Color handled by data-text ::before element */
}

.contact-row__value:hover::after {
    transform: scaleX(1);
    transform-origin: left center;
}

.contact-row__value--static::after {
    display: none;
}

.contact-row__value--static:hover {
    color: inherit;
}

.social {
    display: grid;
    grid-template-columns: 160px minmax(0, 1fr) 20px;
    gap: 18px;
    align-items: center;
    padding: 22px 0;
    border-bottom: 1px solid var(--color-white-08);
    color: var(--color-canvas-white);
    transition: padding-left var(--t-slow) var(--ease),
        color var(--t-slow) var(--ease);
    cursor: none;
}

.surface--light .social {
    color: var(--color-obsidian);
    border-color: var(--color-obsidian-08);
}

.social:hover {
    padding-left: 8px;
    color: var(--color-desert-sienna);
}

.social__label {
    font-size: 13px;
    font-weight: var(--weight-bold);
    letter-spacing: 0.10em;
    color: var(--color-slate-mist);
    text-transform: uppercase;
    transition: color var(--t-slow) var(--ease);
}

.social:hover .social__label {
    color: var(--color-desert-sienna);
}

.social__handle {
    font-size: 17px;
    font-weight: var(--weight-medium);
    color: inherit;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.social__arrow {
    color: inherit;
    transition: transform var(--t-slow) var(--ease);
}

.social:hover .social__arrow {
    transform: translate(3px, -3px);
}

.cta-strip {
    margin-top: clamp(40px, 6vw, 68px);
    display: flex;
    justify-content: center;
}

/* ----- Buttons ----- */
.btn {
    --pad-y: 15px;
    --pad-x: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: var(--weight-bold);
    letter-spacing: -0.005em;
    padding: var(--pad-y) var(--pad-x);
    border-radius: var(--radius-pill);
    border: 1.5px solid transparent;
    cursor: none;
    transition: background var(--t-slow) var(--ease),
        color var(--t-slow) var(--ease),
        border-color var(--t-slow) var(--ease);
    white-space: nowrap;
    line-height: 1;
    will-change: transform;
}

.btn>* {
    position: relative;
    z-index: 1;
}

.btn--primary {
    background: var(--color-desert-sienna);
    color: var(--color-canvas-white);
    border-color: var(--color-desert-sienna);
    position: relative;
    overflow: hidden;
}

.btn--primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-obsidian);
    transform: translateY(100%);
    transition: transform 0.5s var(--ease-out);
    z-index: 0;
}

.btn--primary:hover::before {
    transform: translateY(0);
}

.btn--primary:hover {
    border-color: var(--color-obsidian);
}

.btn--obsidian {
    background: var(--color-obsidian);
    color: var(--color-canvas-white);
    border-color: var(--color-obsidian);
}

.btn--obsidian:hover {
    background: var(--color-desert-sienna);
    border-color: var(--color-desert-sienna);
}

.btn--ghost-light {
    background: transparent;
    color: var(--color-canvas-white);
    border-color: var(--color-canvas-white);
}

.btn--ghost-light:hover {
    background: var(--color-canvas-white);
    color: var(--color-obsidian);
}

.btn--ghost-dark {
    background: transparent;
    color: var(--color-obsidian);
    border-color: var(--color-obsidian);
}

.btn--ghost-dark:hover {
    background: var(--color-obsidian);
    color: var(--color-canvas-white);
}

.btn--lg {
    --pad-y: 19px;
    --pad-x: 28px;
    font-size: 18px;
}

.btn svg {
    transition: transform var(--t-base) var(--ease);
    position: relative;
    z-index: 1;
}

.btn:hover svg {
    transform: translateX(3px);
}