/* ==========================================================================
   Flora Cao — portfolio
   Sans (system / SF) for names and prose. Mono for data: tags, indexes, labels.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #86868b;
  --line: #e8e8ed;
  --ph: #f5f5f7;
  --ph-ink: #a1a1a6;
  --ph-grid: #ededf0;
  --accent: #0071e3;
  --accent-soft: #e8f1fc;

  /* One typeface everywhere: Helvetica. Small text = smaller / light / italic; titles = bold. No all-caps. */
  --sans: 'Helvetica Neue', Helvetica, Arial, sans-serif;

  --panel: clamp(240px, 22vw, 340px);
  --pad: clamp(20px, 3.2vw, 56px);
  --top: calc(var(--pad) * 0.8); /* space above the name, the homepage grid and project titles */
  --gap-x: clamp(20px, 2.4vw, 44px);
  --gap-y: clamp(44px, 4.4vw, 80px);
  --name-h: 34px;   /* height of the "Flora Cao" line */
  --name-gap: 28px; /* space between name and portrait */

  --grid-cols: 3;
  --grid-gap: 16px;  /* space between covers, side to side */
  --grid-row-gap: var(--top); /* space between rows of covers = space above the grid */
  --media-gap: 12px; /* space between images/videos on project pages */
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 15px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, p, ul, ol, dl, dd, figure {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

img, video {
  display: block;
  max-width: 100%;
  dynamic-range-limit: standard; /* never let HDR photos/videos glow brighter than the page */
}

:focus-visible {
  outline: 1px solid var(--fg);
  outline-offset: 4px;
}

.label {
  font: italic 400 13px/1.4 var(--sans);
  color: var(--muted);
}

/* ---------- Layout -------------------------------------------------------- */

.layout {
  display: grid;
  grid-template-columns: var(--panel) minmax(0, 1fr);
  column-gap: var(--pad);
  padding: 0 var(--pad);
}

.main {
  /* top of the right side lines up with the top of the portrait */
  padding: calc(var(--pad) + var(--name-h) + var(--name-gap)) 0 calc(var(--pad) * 2);
  min-width: 0;
}

/* Homepage: the grid starts near the top, with the same padding as the right edge. */
@media (min-width: 861px) {
  [data-page='home'] .main {
    padding-top: var(--top); /* lines up with the top of the name */
  }

  [data-page='home'] .layout {
    padding-right: calc(var(--pad) * 1.3);
  }
}

/* Project pages: the title lines up with the name (click the name to go home). */
[data-page='project'] .main {
  padding-top: var(--top);
}

/* ---------- Identity panel ----------------------------------------------- */

.identity {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  padding: var(--top) 0 var(--pad);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  scrollbar-width: none;
  /* a little room on each side so the name isn't clipped when it grows on hover */
  margin-inline: -12px;
  padding-inline: 12px;
}

.identity__name {
  display: block;
  font: 700 30px/var(--name-h) var(--sans);
  letter-spacing: -0.02em;
}

/* name as an image: fills most of the panel's width, grows a little on hover so it reads as clickable */
.identity__name--image img {
  display: block;
  width: 92%;
  height: auto;
  transform-origin: center;
  transition: transform 0.12s ease-out;
}

.identity__name--image:hover img,
.identity__name--image:focus-visible img {
  transform: scale(1.02);
}

.identity__name--image:active img {
  transform: scale(1.01);
}

.identity__portrait {
  margin-top: auto; /* sits at the bottom of the panel */
  padding-top: 32px;
}

/* Dot portrait: the slot only reserves space; the dots are drawn on
   a full-window canvas behind everything (js/pixel-portrait.js). */
.identity__portrait--dots {
  aspect-ratio: 4 / 3;
}

.portrait-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.identity__info {
  margin-top: var(--name-gap); /* lines up with the top of the project grid */
}

.identity__focus li {
  font: 300 14px/1.6 var(--sans);
  color: var(--muted);
}

.identity__nav {
  display: flex;
  gap: 20px;
  margin-top: 24px;
}

.identity__nav:first-child {
  margin-top: 0;
}

.identity__nav a {
  font-size: 15px;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.identity__nav a:hover,
.identity__nav a[aria-current='page'] {
  text-decoration-line: underline;
}

/* ---------- Media ---------------------------------------------------------- */

.media__frame {
  position: relative;
  background: var(--ph);
  overflow: hidden;
}

.media__frame img,
.media__frame video {
  width: 100%;
  height: auto;
}

.media__frame--fixed img,
.media__frame--fixed video,
.media__frame--fixed iframe {
  position: absolute;
  inset: 0;
  height: 100%;
  object-fit: cover;
}

.media__frame iframe {
  width: 100%;
  border: 0;
}

.media--contain .media__frame {
  background: transparent;
}

.media--contain .media__frame--fixed img,
.media--contain .media__frame--fixed video {
  object-fit: contain;
}

.identity .media--contain .media__frame--fixed img {
  object-position: left top;
}

.tile .media--contain .media__frame {
  background: var(--ph);
}

.media__caption {
  margin-top: 10px;
  font: italic 300 13px/1.5 var(--sans);
  color: var(--muted);
}

/* Placeholder: a labelled frame that tells you which file goes where. */
.ph {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 12px 14px;
  background-color: var(--ph);
  background-image:
    linear-gradient(var(--ph-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--ph-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -1px -1px;
  font: 300 12px/1.4 var(--sans);
  color: var(--ph-ink);
}

.ph__label {
  font-style: italic;
}

.ph__cross {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  transform: translate(-50%, -50%);
  background:
    linear-gradient(var(--ph-ink), var(--ph-ink)) center / 100% 1px no-repeat,
    linear-gradient(var(--ph-ink), var(--ph-ink)) center / 1px 100% no-repeat;
}

.ph__foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
}

.ph__foot span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- Project grid --------------------------------------------------- */

.grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols), minmax(0, 1fr));
  gap: var(--grid-row-gap) var(--grid-gap);
}

/* Title + blurb sit on the cover and appear on hover / keyboard focus. */
.tile {
  position: relative;
  display: block;
}

.tile__caption {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 2px;
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.42);
  color: #fff;
  font-size: 14px;
  line-height: 1.4;
  opacity: 0;
  transition: opacity 0.2s ease;
}

/* small partner logos pinned to the top-right of a cover */
.tile__logos {
  position: absolute;
  top: 10px;
  right: 12px;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  pointer-events: none;
}

.tile__logos img {
  display: block;
  width: auto;
}

/* "In progress" chip, always visible on the cover */
.tile__status {
  position: absolute;
  top: 10px;
  left: 12px;
  z-index: 1;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  font: italic 400 12px/1.2 var(--sans);
  color: var(--fg);
  pointer-events: none;
}

.tile:hover .tile__caption,
.tile:focus-visible .tile__caption {
  opacity: 1;
}

.tile:focus-visible {
  outline-offset: 2px;
}

.tile__title {
  font-weight: 700;
}

.tile__blurb {
  font-weight: 300;
  color: rgba(255, 255, 255, 0.85);
}

/* Touch screens can't hover: show the caption under the cover instead. */
@media (hover: none) {
  .grid {
    row-gap: 28px;
  }

  .tile__caption {
    position: static;
    padding: 10px 0 0;
    background: none;
    color: var(--fg);
    opacity: 1;
  }

  .tile__blurb {
    color: var(--muted);
  }
}

/* ---------- Project page --------------------------------------------------- */

.project {
  max-width: 1200px;
}

.back {
  display: inline-block;
  font: 300 14px/1.4 var(--sans);
  color: var(--muted);
}

.back:hover {
  color: var(--fg);
}

.project__head {
  margin: 0 0 clamp(32px, 3.6vw, 48px);
}

/* title, then partner logos right next to it on the same line */
.project__titlerow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 44px;
}

.project__title {
  font: 700 clamp(28px, 2.8vw, 40px)/1.08 var(--sans);
  letter-spacing: -0.028em;
}

.project__logo {
  display: block;
  height: calc(clamp(30px, 3.2vw, 46px) * var(--logo-scale, 1));
  width: auto;
  max-width: 100%;
}

/* logo pieces sit edge to edge, no gap */
.project__logo-set {
  display: flex;
  align-items: flex-end;
}

.project__logo-set .project__logo {
  height: calc(clamp(36px, 3.8vw, 54px) * var(--logo-scale, 1));
}

/* the same gap as between the letters inside the artwork (about 1.7 of its 53 units) */
.project__logo-set .project__logo + .project__logo {
  margin-left: calc(clamp(36px, 3.8vw, 54px) * 1.73 / 53);
}

[data-page='home'] .project__foot {
  margin-top: calc(var(--top) * 2);
}

.project__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 20px;
}

/* copyright line at the end of the homepage and every project page */
.project__foot {
  margin-top: clamp(80px, 9vw, 140px);
  text-align: center;
  font: 300 13px/1.4 var(--sans);
  color: var(--muted);
}

/* tag chip: short text on a soft, semi-transparent grey pill (like a story location sticker) */
.tag {
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(120, 120, 128, 0.14);
  font: 400 13px/1.2 var(--sans);
  color: var(--fg);
}

/* short note about the page itself, e.g. research under review */
.project__preface {
  max-width: 48em;
  margin-top: 14px;
  font: italic 300 14px/1.5 var(--sans);
  color: var(--muted);
}

.project__summary {
  max-width: 48em;
  margin-top: 18px;
  font: 400 17px/1.55 var(--sans);
}

.project__meta {
  max-width: 44em;
  margin-top: 36px;
  border-top: 1px solid var(--line);
}

.project__meta div {
  display: grid;
  grid-template-columns: 9em 1fr;
  column-gap: var(--gap-x);
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.project__meta dt {
  padding-top: 1px;
  font: italic 400 13px/1.4 var(--sans);
  color: var(--muted);
}

.project__meta dd {
  font-size: 14px;
  line-height: 1.5;
}

/* Page reader: a row of page previews on top, the current page large below.
   No arrows or counters — the bright thumbnail and its marker show where you are. */
.reader__hint {
  margin-bottom: 16px;
  font: 400 18px/1.4 var(--sans);
  color: #fc6c60; /* Voibook logo orange — this invitation matters */
}

/* the instruction matches the device: mouse/trackpad vs touch screen */
.reader__hint-touch { display: none; }

@media (hover: none) {
  .reader__hint-mouse { display: none; }
  .reader__hint-touch { display: inline; }
}

.reader__thumbs {
  display: flex;
  gap: 8px;
  padding-bottom: 14px; /* room for the dot */
  margin-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.reader__thumbs::-webkit-scrollbar {
  display: none;
}

.reader__thumb {
  position: relative;
  flex: 1 0 64px;
  aspect-ratio: var(--page-ratio);
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: var(--ph);
  opacity: 0.35;
  cursor: pointer;
  transition: opacity 0.25s ease;
}

.reader__thumb img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  object-fit: cover;
}

.reader__thumb:hover {
  opacity: 0.7;
}

.reader__thumb[aria-current] {
  opacity: 1;
}

/* dot under the current page */
.reader__thumb::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--fg);
  transform: translateX(-50%) scale(0);
  transition: transform 0.25s ease;
}

.reader__thumb[aria-current]::after {
  transform: translateX(-50%) scale(1);
}

.reader__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  border-radius: 12px;
  background: var(--ph);
  outline-offset: 4px;
}

.reader__track::-webkit-scrollbar {
  display: none;
}

.reader__track[data-cursor='prev'] { cursor: w-resize; }
.reader__track[data-cursor='next'] { cursor: e-resize; }

.reader__page {
  position: relative;
  aspect-ratio: var(--page-ratio);
  scroll-snap-align: start;
  scroll-snap-stop: always;
  overflow: hidden;
  user-select: none;
}

.reader__page img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Small partner / collaborator logos at the top of a project page */
.project__logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
}

.project__logos img {
  height: 22px;
  width: auto;
}

/* Content blocks: small italic label in a narrow left column, prose on the right,
   media full width underneath. */
.block {
  margin-top: clamp(32px, 3vw, 48px);
}

/* A media-only block continues the one above it like another row. */
.block:not(:has(.block__text)) {
  margin-top: var(--media-gap);
}

/* small label on top, text underneath */
.block__text {
  display: grid;
  row-gap: 10px;
}

.block__body {
  max-width: 54em;
}

.block__body h3 {
  margin-bottom: 12px;
  font: 700 20px/1.3 var(--sans);
  letter-spacing: -0.015em;
}

.block__body p {
  font-size: 17px;
  line-height: 1.6;
}

.block__body p + p {
  margin-top: 1em;
}

.block__body a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

/* Design question: large, on a soft rounded panel */
.block__body .quote {
  padding: clamp(24px, 3vw, 40px);
  border-radius: 18px;
  background: linear-gradient(135deg, #f5f5f7, #fbfbfd);
  font: 700 clamp(22px, 2.2vw, 30px)/1.3 var(--sans);
  letter-spacing: -0.02em;
}

/* Big number + the finding it comes from */
.stat {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-top: 1.4em;
}

.block__body .stat__value {
  font: 300 clamp(44px, 4.4vw, 60px)/1 var(--sans);
  letter-spacing: -0.03em;
  color: var(--accent);
}

.block__body .stat__text {
  font-size: 17px;
}

.block__body .stat__source {
  margin-top: 4px;
  font: italic 300 13px/1.4 var(--sans);
  color: var(--muted);
}

/* Question / answer pairs */
.qa div + div {
  margin-top: 1em;
}

.qa dt {
  font-weight: 700;
  font-size: 17px;
}

.qa dd {
  margin: 0;
  font-size: 17px;
  line-height: 1.6;
}

/* Gap table: rounded panel, rows separated by space, not lines */
.gap {
  margin: 1.4em 0;
  overflow-x: auto;
}

.gap table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 4px;
  font-size: 15px;
}

.gap th,
.gap td {
  padding: 12px 10px;
  text-align: center;
  white-space: nowrap;
}

.gap thead th {
  padding-bottom: 6px;
  font: 700 14px/1.3 var(--sans);
  white-space: normal;
  vertical-align: bottom;
}

.gap tbody th {
  text-align: left;
  font-weight: 400;
}

.gap tbody tr > * {
  background: var(--ph);
}

.gap tbody tr > :first-child { border-radius: 12px 0 0 12px; }
.gap tbody tr > :last-child { border-radius: 0 12px 12px 0; }

.gap tbody .gap__highlight > * {
  background: var(--accent-soft);
}

.gap .gap__highlight th {
  font-weight: 700;
}

.gap__icon {
  display: inline-block;
  width: 18px;
  height: 18px;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: middle;
}

.gap__icon--yes { stroke: var(--accent); }
.gap__icon--no { stroke: var(--ph-ink); }

/* side-by-side hero images: as wide as the text column, not the whole page */
.project__hero.block__media {
  max-width: 54em;
}

.block__text + .block__media {
  margin-top: 16px;
}

.block__media {
  display: grid;
  gap: var(--media-gap);
}

.block__media--row {
  display: flex;
  align-items: flex-start;
}

.block__media--row .media {
  min-width: 0;
}

.block__media.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.block__media.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }


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

.about .project__head {
  margin-top: 0;
}

/* About: two sizes only — small grey labels and 17px text (links included) */
.about > .block:first-child {
  margin-top: 0;
}

.about__links {
  font-size: 17px;
  line-height: 1.6;
}

.about__links li + li {
  margin-top: 4px;
}

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

@media (max-width: 1100px) {
  :root {
    --grid-cols: 2;
  }
}

@media (max-width: 560px) {
  :root {
    --grid-cols: 1;
  }
}

@media (max-width: 860px) {
  :root {
    --pad: 20px;
  }

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

  .identity {
    position: static;
    height: auto;
    overflow: visible;
    margin-inline: 0;
    padding-inline: 0;
    display: grid;
    grid-template-columns: 120px 1fr;
    grid-template-areas: 'name name' 'portrait info';
    column-gap: 20px;
    align-items: end;
  }

  .identity:not(:has(.identity__portrait)) {
    grid-template-areas: 'name name' 'info info';
  }

  .identity:not(:has(.identity__portrait)) .identity__info {
    margin-top: 16px;
  }

  .identity__name {
    grid-area: name;
  }

  .identity__portrait {
    grid-area: portrait;
    margin-top: 20px;
    padding-top: 0;
  }

  .identity__info {
    grid-area: info;
    margin-top: 0;
  }

  .main {
    padding-top: 24px;
  }

  .block__media.cols-2,
  .block__media.cols-3 {
    grid-template-columns: minmax(0, 1fr);
  }

  .block__media--row {
    flex-direction: column;
  }

  .block__media--row .media {
    flex: none !important;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}