/* ============================================================
   Picture — layout & visual system
   Structure ported from the CocoBasic "Picture" Framer template;
   content and imagery are Ruobing Chen's.
   ============================================================ */

:root {
    --ink: #111111;
    --muted: #898989;
    --paper: #ffffff;
    --radius: 6px;

    --pad-l: 70px;
    --pad-r: 66px;
    --side-w: 296px;
    --side-gap: 112px;

    --col-gap: 80px;
    --row-gap: 40px;
    --col-offset: 40px;

    --ratio-wide: 408 / 280;
    --ratio-mid: 408 / 400;
    --ratio-tall: 408 / 600;
    --prose-w: 632px;
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--ink);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ---------- Shell ---------- */

.shell {
    display: grid;
    grid-template-columns: var(--side-w) 1fr;
    column-gap: var(--side-gap);
    max-width: 1440px;
    margin: 0 auto;
    padding-left: var(--pad-l);
    padding-right: var(--pad-r);
    align-items: start;
}

/* ---------- Sidebar ---------- */

.side {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 70px 0;
    display: flex;
    flex-direction: column;
}

.side-logo {
    display: block;
    color: var(--ink);
    margin-bottom: 31px;
}

.side-logo svg {
    display: block;
}

.side-name {
    font-size: 14px;
    font-weight: 700;
    line-height: 22.4px;
}

.side-role {
    font-size: 14px;
    font-weight: 400;
    line-height: 22.4px;
    color: var(--muted);
}

.side-bio {
    margin-top: 67px;
    max-width: var(--side-w);
}

.side-nav {
    margin-top: 42px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 9.6px;
}

.side-nav a {
    line-height: 22.4px;
    transition: color 0.3s ease;
}

.side-nav a:hover,
.side-nav a[aria-current='page'] {
    color: var(--muted);
}

.side-btn {
    margin-top: 44px;
    align-self: flex-start;
    background: var(--ink);
    color: var(--paper);
    font-size: 14px;
    font-weight: 500;
    line-height: 15.4px;
    padding: 12px 24px;
    border-radius: var(--radius);
    transition: opacity 0.3s ease;
}

.side-btn:hover {
    opacity: 0.8;
}

.side-foot {
    margin-top: auto;
    font-size: 12px;
    line-height: 13.2px;
    color: var(--muted);
}

.side-foot .side-links {
    display: flex;
    gap: 16px;
    margin-bottom: 10px;
}

.side-foot a {
    transition: color 0.3s ease;
}

.side-foot a:hover {
    color: var(--ink);
}

/* ---------- Main ---------- */

.main {
    padding: 70px 0 140px;
    min-width: 0;
}

/* ---------- Two-column image grid ---------- */

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: var(--col-gap);
    align-items: start;
}

.grid-col {
    display: flex;
    flex-direction: column;
    gap: var(--row-gap);
    min-width: 0;
}

/* second column starts lower, as in the template */
.grid-col:nth-child(2) {
    margin-top: var(--col-offset);
}

/* ---------- Tile ---------- */

.tile {
    display: block;
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    background: #f0f0f0;
    aspect-ratio: var(--ratio-wide);
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.tile.mid {
    aspect-ratio: var(--ratio-mid);
}

.tile.tall {
    aspect-ratio: var(--ratio-tall);
}

.tile.is-in {
    opacity: 1;
    transform: none;
}

.tile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* UI screenshots read better anchored to their top edge */
.tile.ui img {
    object-position: center top;
}

.tile-veil {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.78) 0%, rgba(0, 0, 0, 0.42) 40%, rgba(0, 0, 0, 0.08) 75%, rgba(0, 0, 0, 0) 100%);
    opacity: 0;
    transition: opacity 0.45s ease;
}

.tile-veil h2 {
    font-size: 16px;
    font-weight: 500;
    line-height: 17.6px;
    color: #ffffff;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
}

.tile-veil p {
    margin-top: 6px;
    font-size: 14px;
    font-weight: 400;
    line-height: 15.4px;
    color: rgba(255, 255, 255, 0.72);
}

.tile:hover img {
    transform: scale(1.09);
}

.tile:hover .tile-veil {
    opacity: 1;
}

/* ---------- Prose / About ---------- */

.prose {
    max-width: var(--prose-w);
}

.prose-hero {
    width: 100%;
    aspect-ratio: 632 / 360;
    object-fit: cover;
    object-position: center 30%;
    border-radius: var(--radius);
}

.block {
    margin-top: 64px;
}

.eyebrow {
    font-size: 14px;
    font-weight: 500;
    line-height: 15.4px;
    color: var(--muted);
    margin-bottom: 32px;
}

.block h1,
.block h2 {
    font-size: 32px;
    font-weight: 600;
    line-height: 41.6px;
    letter-spacing: -0.01em;
    margin-bottom: 24px;
}

.block p {
    margin-bottom: 22px;
}

.block p:last-child {
    margin-bottom: 0;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tags span {
    border: 1px solid rgba(17, 17, 17, 0.14);
    border-radius: var(--radius);
    padding: 7px 14px;
    line-height: 15.4px;
}

.roles {
    border-top: 1px solid rgba(17, 17, 17, 0.12);
}

.roles div {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 24px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(17, 17, 17, 0.12);
}

.roles em {
    font-style: normal;
    color: var(--muted);
}

.roles time {
    color: var(--muted);
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* ---------- Case study ---------- */

.case {
    max-width: var(--prose-w);
}

.case-cat {
    font-size: 12px;
    line-height: 13.2px;
    color: var(--ink);
    margin-bottom: 24px;
}

.case h1 {
    font-size: 32px;
    font-weight: 600;
    line-height: 41.6px;
    letter-spacing: -0.01em;
    margin-bottom: 40px;
}

.case-meta {
    color: var(--muted);
    margin: 32px 0 40px;
}

.case p {
    margin-bottom: 22px;
}

.case p:last-child {
    margin-bottom: 0;
}

/* The template's pull quote: larger, muted, indented from the column */
.quote {
    font-size: 18px;
    line-height: 36px;
    color: var(--muted);
    padding-left: 24px;
    margin: 48px 0;
}

.case-h {
    font-size: 16px;
    font-weight: 500;
    line-height: 17.6px;
    margin: 56px 0 20px;
}

/* Figure with focal crop.
   --ar  frame aspect ratio
   --pos which part of the image to keep in frame
   --z   how far to zoom into that point  */
.shot {
    margin: 40px 0;
}

.shot .frame {
    aspect-ratio: var(--ar, 632 / 360);
    overflow: hidden;
    border-radius: var(--radius);
    background: #f0f0f0;
}

.shot img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: var(--pos, center);
    transform: scale(var(--z, 1));
    transform-origin: var(--pos, center);
}

.shot.mono img {
    filter: grayscale(1);
}

.shot figcaption {
    margin-top: 12px;
    font-size: 12px;
    line-height: 18px;
    color: var(--muted);
}

.shot.pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.shot.pair figcaption {
    grid-column: 1 / -1;
    margin-top: 0;
}

.metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 48px 0;
    border-top: 1px solid rgba(17, 17, 17, 0.12);
    padding-top: 24px;
}

.metrics b {
    display: block;
    font-size: 28px;
    font-weight: 600;
    line-height: 34px;
    letter-spacing: -0.01em;
}

.metrics span {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    line-height: 18px;
    color: var(--muted);
}

.related {
    margin-top: 96px;
    border-top: 1px solid rgba(17, 17, 17, 0.12);
    padding-top: 24px;
}

.related > p {
    font-size: 12px;
    line-height: 13.2px;
    margin-bottom: 24px;
}

.related-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.related-grid a span {
    display: block;
    font-size: 12px;
    line-height: 13.2px;
    color: var(--muted);
    margin-bottom: 8px;
}

.related-grid a h3 {
    font-size: 16px;
    font-weight: 500;
    line-height: 17.6px;
    transition: color 0.3s ease;
}

.related-grid a:hover h3 {
    color: var(--muted);
}

/* ---------- Read gate ---------- */

.gate-locked {
    overflow: hidden;
}

.gate {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    /* let a sliver of the article show through at the top, then fade to paper */
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.92) 14%, var(--paper) 26%);
    opacity: 0;
    animation: gate-in 0.5s ease forwards;
}

@keyframes gate-in {
    to { opacity: 1; }
}

.gate-card {
    width: 100%;
    max-width: 420px;
    text-align: left;
}

.gate-card h2 {
    font-size: 20px;
    font-weight: 500;
    line-height: 28px;
    letter-spacing: -0.01em;
    margin-bottom: 20px;
}

.gate-form {
    display: flex;
    gap: 8px;
}

.gate-form input {
    flex: 1;
    min-width: 0;
    font-family: inherit;
    font-size: 14px;
    line-height: 15.4px;
    color: var(--ink);
    background: var(--paper);
    border: 1px solid rgba(17, 17, 17, 0.18);
    border-radius: var(--radius);
    padding: 12px 14px;
    transition: border-color 0.2s ease;
}

.gate-form input::placeholder {
    color: var(--ink-faint, #b8b8b8);
}

.gate-form input:focus {
    outline: none;
    border-color: var(--ink);
}

.gate-form button {
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    line-height: 15.4px;
    color: var(--paper);
    background: var(--ink);
    border: 0;
    border-radius: var(--radius);
    padding: 12px 24px;
    cursor: pointer;
    transition: opacity 0.25s ease;
}

.gate-form button:hover {
    opacity: 0.8;
}

.gate-error {
    margin: 14px 0 0;
    font-size: 12px;
    line-height: 18px;
    color: #b4231f;
    visibility: hidden;
}

.gate-error.show {
    visibility: visible;
}

.gate-alt {
    margin-top: 28px;
    font-size: 12px;
    line-height: 18px;
    color: var(--muted);
}

.gate-alt a {
    color: var(--ink);
    text-decoration: underline;
    text-underline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .gate {
        animation: none;
        opacity: 1;
    }
}

/* ---------- Reveal ---------- */

.rise {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.rise.is-in {
    opacity: 1;
    transform: none;
}

/* ---------- Responsive ---------- */

@media (max-width: 1280px) {
    :root {
        --pad-l: 48px;
        --pad-r: 48px;
        --side-w: 260px;
        --side-gap: 72px;
        --col-gap: 48px;
    }
}

@media (max-width: 900px) {
    /* Flatten the sidebar so its parts can be reordered around the content:
       intro on top, copyright pushed to the true bottom of the page. */
    .shell {
        display: flex;
        flex-direction: column;
        /* override the desktop `align-items: start`, which would otherwise
           shrink-wrap each item on the cross axis and collapse .main to 0 */
        align-items: stretch;
        padding: 48px 24px 0;
    }

    .side {
        display: contents;
    }

    .side-logo { order: 1; }
    .side-name { order: 2; }
    .side-role { order: 3; }
    .side-bio  { order: 4; }
    .side-nav  { order: 5; }
    .side-btn  { order: 6; }
    .main      { order: 7; }
    .side-foot { order: 8; }

    .side-bio {
        margin-top: 40px;
        max-width: 420px;
    }

    .side-nav {
        margin-top: 32px;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 24px;
    }

    .side-btn {
        margin-top: 32px;
    }

    .side-foot {
        margin-top: 64px;
        padding-bottom: 48px;
    }

    .main {
        padding: 56px 0 0;
    }

    .grid {
        grid-template-columns: 1fr;
        row-gap: var(--row-gap);
    }

    .grid-col:nth-child(2) {
        margin-top: 0;
    }

    .block h1,
    .block h2 {
        font-size: 26px;
        line-height: 34px;
    }

    /* touch devices have no hover — keep captions visible, and darken the
       scrim further since it can no longer be revealed on demand */
    .tile-veil {
        opacity: 1;
        background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0.55) 35%, rgba(0, 0, 0, 0.12) 70%, rgba(0, 0, 0, 0) 100%);
    }
}

@media (prefers-reduced-motion: reduce) {
    .tile,
    .rise {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .tile img,
    .tile-veil {
        transition: none;
    }
}