/* ============================================================
   ROSHAN MOHAN — PORTFOLIO
   Visual language adapted from TemplateMo 619 Axis Industrial
   (https://templatemo.com/tm-619-axis-industrial)
   ============================================================
   1. RESET & VARIABLES
   2. BASE TYPOGRAPHY
   3. UTILITIES
   4. HEADER / NAV
   5. HERO
   6. SECTIONS
   7. WORK CARDS
   8. PROJECT POPUP
   9. FOOTER
   10. RESPONSIVE
   ============================================================ */

/* ----- 1. RESET & VARIABLES ----- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Palette */
    --base: #FFFFFF;
    --ink: #000000;
    --safety: #FF3E00;
    --muted: #888888;
    --surface: #F5F5F0;
    --hair: #E5E5E0;

    /* Borders & Shadows */
    --border: 4px solid var(--ink);
    --shadow: 8px 8px 0px var(--ink);

    /* Type Scale */
    --fs-h1: clamp(2.4rem, 5vw, 5rem);
    --fs-h3: clamp(1.1rem, 1.6vw, 1.5rem);
    --fs-body: clamp(0.9rem, 1.1vw, 1.1rem);
    --fs-data: clamp(0.78rem, 0.9vw, 0.95rem);
    --fs-micro: 0.62rem;

    /* Spacing & Layout */
    --gutter: clamp(1rem, 4vw, 4rem);
    --gap: clamp(1rem, 2vw, 2rem);
    --section-pad: clamp(4rem, 8vw, 8rem) var(--gutter);
    --header-h: 44px;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-h);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-body);
    line-height: 1.5;
    letter-spacing: -0.02em;
    color: var(--ink);
    background-color: var(--base);
    overflow-x: hidden;
}

body.modal-open { overflow: hidden; }

img { max-width: 100%; display: block; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::selection {
    background: var(--safety);
    color: var(--base);
}


/* ----- 2. BASE TYPOGRAPHY ----- */
h1, h2, h3, h4 {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    text-transform: uppercase;
    line-height: 1;
    letter-spacing: -0.03em;
}


/* ----- 3. UTILITIES ----- */
.container {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
}

.tag {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.3em 0.7em;
    border: 2px solid var(--ink);
    background: var(--base);
}

.tag--filled {
    background: var(--ink);
    color: var(--base);
}

.tag--safety {
    background: var(--safety);
    color: var(--base);
    border-color: var(--safety);
}

/* Larger tag used as a call-to-action link */
.tag--btn {
    padding: 0.9em 1.6em;
    font-size: 0.7rem;
    box-shadow: 4px 4px 0 var(--ink);
    transition: transform 0.15s, box-shadow 0.15s;
}

.tag--btn:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--ink);
}

.inline-link {
    color: var(--safety);
    font-weight: 500;
    text-decoration: underline;
    transition: opacity 0.2s;
}

.inline-link:hover { opacity: 0.7; }

/* Scroll reveal (toggled by js/main.js) */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}


/* ----- 4. HEADER / NAV ----- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-h);
    z-index: 1000;
    background: var(--ink);
    color: var(--base);
    border-bottom: 2px solid var(--safety);
    display: flex;
    align-items: center;
    padding: 0 clamp(1rem, 3vw, 3rem);
}

.header__inner {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.header__logo {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    white-space: nowrap;
}

.header__logo img {
    height: 28px;
    width: auto;
}

.header__nav {
    display: flex;
    align-items: stretch;
    height: var(--header-h);
    border-left: 1px solid rgba(255,255,255,0.10);
}

.header__nav a {
    font-size: var(--fs-micro);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0 1.2rem;
    display: flex;
    align-items: center;
    border-right: 1px solid rgba(255,255,255,0.10);
    color: rgba(255,255,255,0.6);
}

.header__nav a:hover {
    background: var(--safety);
    color: var(--base);
}

.header__burger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.header__burger span {
    width: 22px;
    height: 2px;
    background: var(--base);
}


/* ----- 5. HERO ----- */
.hero {
    position: relative;
    overflow: hidden;
    padding: var(--section-pad);
    padding-top: calc(var(--header-h) + clamp(3rem, 8vw, 7rem));
    border-bottom: var(--border);
}

.hero__grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0,0,0,0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.045) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero__inner {
    position: relative;
    z-index: 1;
}

/* "The boundary": engineering-drawing arc whose radius is the headline (drawn by js/main.js) */
.hero__boundary {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: visible;
}

.boundary__arc {
    fill: none;
    stroke: var(--safety);
    stroke-width: 1.5;
    transition: stroke 1.2s ease;
}

/* Once pushed, the new boundary settles into a very light grey */
.hero__boundary.is-pushed .boundary__arc { stroke: #DDDDDD; }

.boundary__ghost {
    fill: none;
    stroke: var(--ink);
    stroke-opacity: 0.3;
    stroke-width: 1;
    stroke-dasharray: 6 4;
}

.boundary__mark {
    stroke: var(--ink);
    stroke-opacity: 0.6;
    stroke-width: 1;
}

.hero__photo {
    width: 200px;
    height: auto;
    margin-bottom: 1.5rem;
    filter: grayscale(100%);
    transition: filter 0.3s;
}

.hero__photo:hover { filter: grayscale(0%); }

.hero__label {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--safety);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.hero__label::before {
    content: '';
    width: 30px;
    height: 1px;
    background: var(--safety);
}

/* Headline tilts and fades slightly as the page scrolls */
.hero__title {
    font-size: clamp(1.8rem, 3.4vw, 2.5rem);
    line-height: 0.95;
    letter-spacing: -0.04em;
    margin-bottom: 2rem;
    animation: heroTilt linear both;
    animation-timeline: scroll();
    animation-range: 0vh 55vh;
    position: relative;
}

/* Dash-dot underline = the radius of the boundary arc. Width is set by js/main.js;
   it's part of the headline, so it tilts with it. */
.hero__title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -10px;
    width: var(--underline-width, 0);
    height: 1px;
    background: repeating-linear-gradient(90deg,
        rgba(0,0,0,0.35) 0 14px, transparent 14px 18px,
        rgba(0,0,0,0.35) 18px 20px, transparent 20px 24px);
}

/* Dimension arrow from the old boundary to the pushed one, on the same line as the
   underline so it tilts with the headline. Length/opacity are set by js/main.js. */
.hero__dim {
    position: absolute;
    left: var(--underline-width, 0);
    bottom: -10px;
    width: var(--boundary-stretch, 0px);
    height: 1px;
    background: var(--safety);
    opacity: var(--boundary-pushed, 0);
}

.hero__dim::before,
.hero__dim::after {
    content: '';
    position: absolute;
    top: -2.5px;
    border-block: 3px solid transparent;
}

.hero__dim::before { left: 0; border-right: 5px solid var(--safety); }
.hero__dim::after { right: 0; border-left: 5px solid var(--safety); }

@keyframes heroTilt {
    from { transform: rotate(0deg); opacity: 1; }
    to   { transform: rotate(-2.5deg) translateY(-20px); opacity: 0.25; }
}

.hero__bottom {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}

.hero__desc {
    max-width: 420px;
    font-size: var(--fs-data);
    line-height: 1.6;
    opacity: 0.7;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}


/* ----- 6. SECTIONS ----- */
.section {
    padding: var(--section-pad);
    border-bottom: var(--border);
}

.section__header {
    margin-bottom: clamp(2rem, 4vw, 4rem);
}

.section__title {
    font-size: calc(var(--fs-h1) * 0.5);
}


/* ----- 7. WORK CARDS ----- */
.work__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--gap);
}

/* Every row of cards matches the tallest card */
.work__grid { grid-auto-rows: 1fr; }

.work-card {
    border: var(--border);
    box-shadow: var(--shadow);
    background: var(--base);
    padding: clamp(1.2rem, 2vw, 2rem);
    min-height: 160px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: opacity 0.5s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.work-card:hover,
.work-card:focus-visible {
    transform: translate(-4px, -4px);
    box-shadow: 12px 12px 0px var(--ink);
    outline: none;
}

.work-card__summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    width: 100%;
}

.work-card__title {
    font-size: var(--fs-h3);
    margin-bottom: 0.6rem;
}

.work-card__text {
    font-size: var(--fs-data);
    line-height: 1.5;
    opacity: 0.6;
}

.work-card__thumb {
    width: 96px;
    height: 96px;
    object-fit: cover;
    flex-shrink: 0;
    border: 2px solid var(--ink);
}


/* ----- 8. PROJECT POPUP ----- */
.work-card__detail { display: none; }

.work-card.expanded {
    position: fixed;
    inset: calc(var(--header-h) + 2vh) 4vw 3vh;
    z-index: 2000;
    display: block;
    min-height: 0;
    padding: clamp(1.25rem, 3vw, 3rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    cursor: default;
    transform: none;
    transition: none;
    /* Dim everything behind the popup */
    box-shadow: 0 0 0 100vmax rgba(0,0,0,0.6);
}

.work-card.expanded .work-card__summary { display: none; }
.work-card.expanded .work-card__detail { display: block; }

.close-btn {
    position: sticky;
    top: 0;
    float: right;
    z-index: 10;
    margin-left: 1rem;
    padding: 0.7em 1.4em;
    cursor: pointer;
}

.popup-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.5rem, 4vw, 3rem);
    clear: both;
    padding-top: 1rem;
}

.popup-media {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    align-content: start;
}

/* No photos/video yet: drop the empty media column and let the text fill the popup */
.popup-media:not(:has(> :not([hidden]))) { display: none; }
.popup-grid:has(> .popup-media:not(:has(> :not([hidden])))) { grid-template-columns: minmax(0, 1fr); }
.popup-grid:has(> .popup-media:not(:has(> :not([hidden])))) .popup-body { max-width: 80ch; }

.video-wrapper {
    grid-column: 1 / -1;
    aspect-ratio: 16 / 9;
    background: var(--ink);
}

.video-wrapper iframe,
.video-wrapper video {
    display: block;
    width: 100%;
    height: 100%;
    border: none;
}

.popup-img {
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: cover;
    border: 1px solid var(--hair);
}

/* Show the whole image instead of cropping (cut-outs on white) */
.popup-img--contain {
    object-fit: contain;
    background: var(--base);
}

/* Full-width images keep their natural shape (e.g. ones with captions) */
.popup-img--full {
    grid-column: 1 / -1;
    aspect-ratio: auto;
    height: auto;
}

/* Square pair, side by side */
.popup-img--square { aspect-ratio: 1 / 1; }

/* Full-width box for tall images, shown whole on white */
.popup-img--boxed { aspect-ratio: 4 / 3; }

/* Image with a caption underneath */
.popup-figure { grid-column: 1 / -1; }

.popup-figure figcaption {
    margin-top: 0.4rem;
    font-size: 0.75rem;
    opacity: 0.6;
}

.popup-body h2 {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    line-height: 1.05;
    margin-bottom: 1rem;
}

.popup-body h3 {
    font-size: 1.2rem;
    line-height: 1.2;
    margin: 1.5rem 0 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--hair);
}

.popup-body h4 {
    font-size: 1rem;
    line-height: 1.3;
    margin: 1.25rem 0 0.4rem;
    color: var(--safety);
}

.popup-body .tag {
    font-size: 0.65rem;
    opacity: 1;
    margin-bottom: 1.5rem;
}

.popup-body p,
.popup-body ul {
    margin-bottom: 1rem;
    font-size: 0.9rem;
    line-height: 1.55;
    opacity: 0.85;
}

.popup-body .lead-text {
    font-size: 1rem;
    opacity: 1;
}

.popup-body ul {
    list-style: square;
    padding-left: 1.25rem;
}

.popup-body li { margin-bottom: 0.4rem; }

.popup-body .popup-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--hair);
}

.popup-links .tag { margin-bottom: 0; }

/* Small reference links (press, articles, patents) */
.popup-body .popup-refs {
    list-style: none;
    padding: 1.25rem 0 0;
    margin-top: 1.5rem;
    border-top: 1px solid var(--hair);
    font-size: 0.8rem;
}

.popup-refs li { margin-bottom: 0.4rem; }


/* Gallery popup: intro on top, collage of photos and videos below */
.popup-gallery {
    clear: both;
    padding-top: 1rem;
}

.collage {
    columns: 3 240px;
    column-gap: 1rem;
    margin-top: 1rem;
}

.collage .popup-figure {
    break-inside: avoid;
    margin-bottom: 1rem;
}

/* Shorter crop for very tall media (e.g. vertical phone clips) */
.collage .collage__compact {
    aspect-ratio: 1 / 1;
    object-fit: cover;
}

.collage img,
.collage video {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--hair);
    background: var(--surface);
}


/* ----- 9. FOOTER ----- */
.footer {
    background: var(--ink);
    color: var(--base);
    padding: 2rem var(--gutter);
}

.footer__inner {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.65rem;
    letter-spacing: 0.02em;
    color: rgba(255,255,255,0.45);
}

.footer__inner a:hover { color: var(--safety); }


/* ----- 10. RESPONSIVE ----- */
@media (max-width: 1024px) {
    .popup-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 768px) {
    .header__nav { display: none; }
    .header__burger { display: flex; }

    .header__nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--header-h);
        left: 0;
        width: 100%;
        height: auto;
        background: var(--ink);
        border-bottom: 2px solid var(--safety);
    }

    .header__nav.open a {
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.06);
        padding: 0.9rem clamp(1rem, 3vw, 3rem);
    }

    .hero__bottom { flex-direction: column; align-items: flex-start; }

    .work__grid { grid-template-columns: minmax(0, 1fr); }

    .work-card.expanded { inset: calc(var(--header-h) + 8px) 8px 8px; }
}

@media (max-width: 480px) {
    .work-card__thumb { width: 64px; height: 64px; }
}