/* ==========================================================================
   about.css — ABOUT section: framed portrait, spec sheet, bio, thrust cards.
   Mobile-first. Only tokens, no hard-coded colors.
   ========================================================================== */

.about {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 7vw, 56px);
  align-items: start;
}

.about__aside {
  display: grid;
  gap: var(--s-5);
  min-width: 0;
}
.about__main {
  min-width: 0;
}

/* tablet: portrait and spec sheet sit side by side */
@media (min-width: 640px) and (max-width: 959.98px) {
  .about__aside {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    align-items: end;
    gap: var(--s-6);
  }
}

@media (min-width: 960px) {
  .about {
    grid-template-columns: minmax(300px, 0.78fr) minmax(0, 1.22fr);
    gap: clamp(40px, 5.5vw, 88px);
  }
}
@media (min-width: 960px) and (min-height: 820px) {
  .about__aside {
    position: sticky;
    top: calc(var(--nav-h) + 24px);
  }
}

/* --------------------------------------------------------------------------
   Portrait — framed photo with a single quiet caption
   -------------------------------------------------------------------------- */
.about__portrait {
  width: 100%;
  max-width: 420px;
}
.about__tilt {
  margin: 0;
  border-radius: var(--r-lg);
  will-change: transform;
}
.about__photo {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: var(--bg-elev);
  box-shadow: var(--shadow-lg);
}

/* monogram tile: placeholder while loading, and the graceful fallback */
.about__mono {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 30% 20%, rgba(var(--accent-rgb), 0.18), transparent 55%),
    radial-gradient(circle at 75% 80%, rgba(var(--accent-2-rgb), 0.2), transparent 55%), var(--bg-elev);
  transition: opacity 0.7s var(--ease-out);
}
.about__mono span {
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 14vw, 6rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  opacity: 0.85;
}
.about__photo.is-loaded .about__mono {
  opacity: 0;
}

.about__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 50% 25%;
  opacity: 0;
  transform: scale(1.05);
  /* tone-match: pull a bright blue-sky photo into the dark UI */
  filter: saturate(0.78) contrast(1.06) brightness(0.93);
  transition: opacity 0.9s var(--ease-out), transform 1.4s var(--ease-out), filter 0.6s var(--ease);
}
.about__img[hidden] {
  display: none;
}
.about__photo.is-loaded .about__img {
  opacity: 1;
  transform: none;
}
:root[data-theme="light"] .about__img {
  filter: saturate(0.95) contrast(1.02);
}

.about__tone {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(var(--accent-2-rgb), 0.16), transparent 42%),
    linear-gradient(0deg, var(--veil), transparent 40%);
  transition: opacity 0.6s var(--ease);
}
/* cyan color wash — blends with the photo (the frame is an isolated stacking context) */
.about__photo::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: rgba(var(--accent-rgb), 0.14);
  mix-blend-mode: color;
  transition: opacity 0.6s var(--ease);
}

/* autofocus reticle — appears on hover */
.about__focus {
  position: absolute;
  left: 50%;
  top: 33%;
  z-index: 1;
  width: 36%;
  aspect-ratio: 1;
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, -50%) scale(1.5);
  transition: opacity 0.4s var(--ease), transform 0.7s var(--ease-out);
  background:
    linear-gradient(var(--accent), var(--accent)) top left / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top left / 2px 14px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) top right / 2px 14px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom left / 2px 14px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 14px 2px no-repeat,
    linear-gradient(var(--accent), var(--accent)) bottom right / 2px 14px no-repeat;
}

@media (hover: hover) and (pointer: fine) {
  .about__portrait:hover .about__img {
    filter: none;
  }
  .about__portrait:hover .about__tone {
    opacity: 0.28;
  }
  .about__portrait:hover .about__photo::before {
    opacity: 0;
  }
  .about__portrait:hover .about__focus {
    opacity: 0.95;
    transform: translate(-50%, -50%) scale(1);
  }
}

/* one quiet caption: place + coordinates */
.about__cap {
  position: absolute;
  left: 16px;
  bottom: 16px;
  z-index: 2;
  max-width: calc(100% - 32px);
  padding: 0.5em 0.75em;
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
  background: var(--veil);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.04em;
  line-height: 1.3;
  pointer-events: none;
}
.about__cap[hidden] {
  display: none;
}

/* --------------------------------------------------------------------------
   Spec sheet — key / value rows
   -------------------------------------------------------------------------- */
.about__specs-wrap {
  min-width: 0;
  width: 100%;
  max-width: 420px;
}
@media (min-width: 640px) and (max-width: 959.98px) {
  .about__specs-wrap {
    max-width: none;
  }
}
.about__specs {
  border-radius: var(--r-md);
}
.about__specs-head {
  padding: 14px 18px 12px;
  border-bottom: 1px solid var(--line);
}
.about__specs-title {
  margin: 0;
  color: var(--text);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1.3;
}
.about__specs-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 8px;
}
.about__spec {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  column-gap: var(--s-3);
  align-items: baseline;
  padding: 9px 10px;
  border-radius: var(--r-xs);
  font-size: var(--fs-sm);
  line-height: 1.5;
}
.about__spec dt {
  color: var(--text-3);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.about__spec dd {
  display: flex;
  align-items: baseline;
  gap: 0.65em;
  min-width: 0;
  margin: 0;
  color: var(--text);
}
.about__spec dd .dot-live {
  flex: none;
  /* stays on the first line when the value wraps (phone width), instead of floating between two lines */
  align-self: flex-start;
  margin-top: 0.5em;
  transform: scale(0.85);
}
.about__spec dd > span:last-child {
  text-wrap: balance; /* 'Huawei Singapore / Research Center' */
}
.about__spec.is-accent {
  background: rgba(var(--accent-rgb), 0.08);
  box-shadow: inset 2px 0 0 var(--accent);
}
.about__spec.is-accent dt {
  color: var(--accent);
}
.about__spec.is-accent dd {
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Bio
   -------------------------------------------------------------------------- */
.about__bio {
  display: grid;
  gap: 1.35em;
  max-width: 62ch;
}
.about__p {
  color: var(--text-2);
  font-size: 1.0625rem;
  line-height: 1.75;
  text-wrap: pretty;
}
.about__p--lead {
  color: var(--text);
  font-size: clamp(1.2rem, 1.02rem + 0.85vw, 1.55rem);
  line-height: 1.5;
  letter-spacing: -0.014em;
  text-wrap: balance;
}
.about__p strong {
  color: var(--text);
  font-weight: 600;
}
.about__p--lead strong {
  background: linear-gradient(transparent 66%, rgba(var(--accent-rgb), 0.24) 0);
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
:root[data-lang="zh"] .about__bio {
  max-width: 35em;
}
:root[data-lang="zh"] .about__p {
  line-height: 1.85;
}
:root[data-lang="zh"] .about__p--lead {
  line-height: 1.65;
  letter-spacing: 0;
}

/* --------------------------------------------------------------------------
   Research thrusts
   -------------------------------------------------------------------------- */
.about__thrusts {
  margin-top: clamp(40px, 6vw, 64px);
}
.about__thrusts-title {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin-bottom: var(--s-4);
  font-weight: 400;
}
.about__thrusts-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}
.about__thrust-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s-4);
}
@media (min-width: 560px) {
  .about__thrust-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.about__thrust-item {
  display: grid;
  min-width: 0;
}

.about__thrust {
  --c: var(--accent-rgb);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  padding: var(--s-5);
  border-radius: var(--r-md);
}
:root[data-theme="light"] .about__thrust[data-thrust="understand"] {
  --c: var(--accent-2-rgb); /* dark keeps a single accent hue for every card */
}
.about__thrust-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--s-1);
}
.about__thrust-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(var(--c), 0.34);
  border-radius: 13px;
  background: rgba(var(--c), 0.1);
  color: rgb(var(--c));
  transition: transform var(--dur-3) var(--ease-out), background var(--dur-2), box-shadow var(--dur-3);
}
.about__thrust-icon .icon {
  width: 22px;
  height: 22px;
}
.about__thrust-idx {
  color: var(--text-3);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-wide);
}
.about__thrust-title {
  font-size: var(--fs-xl);
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
}
.about__thrust-text {
  color: var(--text-2);
  font-size: var(--fs-sm);
  line-height: 1.65;
  text-wrap: pretty;
}
:root[data-lang="zh"] .about__thrust-text {
  line-height: 1.8;
}

@media (hover: hover) and (pointer: fine) {
  .about__thrust:hover .about__thrust-icon {
    transform: translateY(-2px);
    background: rgba(var(--c), 0.18);
    box-shadow: 0 0 24px rgba(var(--c), 0.28);
  }
}

/* paper chips inside a card */
.about__thrust-papers {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: var(--s-3);
}
.about__thrust-label {
  margin-right: 2px;
  color: var(--text-3);
  font-size: var(--fs-micro);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}
.about__paper {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  height: 30px;
  padding: 0 0.7em 0 0.8em;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(var(--c), 0.05);
  color: var(--text);
  font-size: var(--fs-xs);
  font-weight: 500;
  line-height: 1;
  transition: color var(--dur-1), border-color var(--dur-2), background var(--dur-2), transform var(--dur-2) var(--ease);
}
.about__paper::after {
  /* invisible 44px tap target */
  content: "";
  position: absolute;
  inset: -7px -3px;
}
.about__paper-yr {
  color: var(--text-2);
  font-size: var(--fs-micro);
  font-weight: 400;
}
.about__paper-arrow {
  display: inline-flex;
  color: var(--text-3);
  transition: transform var(--dur-2) var(--ease), color var(--dur-2);
}
.about__paper-arrow .icon {
  width: 12px;
  height: 12px;
}
@media (hover: hover) and (pointer: fine) {
  .about__paper:hover {
    border-color: rgba(var(--c), 0.6);
    background: rgba(var(--c), 0.14);
    color: rgb(var(--c));
    transform: translateY(-1px);
  }
  .about__paper:hover .about__paper-arrow {
    color: inherit;
    transform: translate(2px, -2px);
  }
  /* light theme: a paler tint and a slightly deeper ink keep the 12px name at AA while hovered */
  :root[data-theme="light"] .about__paper:hover {
    background: rgba(var(--c), 0.09);
    color: color-mix(in srgb, rgb(var(--c)) 72%, var(--text));
  }
}
.about__paper:focus-visible {
  border-radius: var(--r-pill);
}
/* touch: real 44px targets (the ::after hit area does not count for target-size audits) */
@media (pointer: coarse) {
  .about__paper {
    height: var(--tap);
    padding-inline: 0.95em 0.85em;
  }
  .about__paper::after {
    inset: 0;
  }
}
/* short proper names / titles inside the bio never break across a link boundary */
.about__nw {
  white-space: nowrap;
}

/* light theme: the "now" card gets the amber treatment (dark keeps it neutral; only the tag below is amber) */
:root[data-theme="light"] .about__thrust--now {
  --c: var(--accent-3-rgb);
  border-color: rgba(var(--accent-3-rgb), 0.42);
  background:
    linear-gradient(155deg, rgba(var(--accent-3-rgb), 0.11), transparent 62%), var(--panel);
}
@media (hover: hover) and (pointer: fine) {
  :root[data-theme="light"] .about__thrust--now:hover {
    border-color: rgba(var(--accent-3-rgb), 0.7);
  }
}
:root[data-theme="light"] .about__thrust--now::before {
  background: radial-gradient(460px circle at var(--mx, 50%) var(--my, 0%), rgba(var(--accent-3-rgb), 0.16), transparent 62%);
}
.about__now {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.45em 0.7em;
  border: 1px solid rgba(var(--accent-3-rgb), 0.5);
  border-radius: var(--r-xs);
  background: rgba(var(--accent-3-rgb), 0.12);
  color: rgb(var(--accent-3-rgb));
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1;
  text-transform: uppercase;
}
:root[data-theme="light"] .about__now {
  /* amber on white needs a darker ink to reach 4.5:1 */
  color: color-mix(in srgb, rgb(var(--accent-3-rgb)) 62%, var(--text));
}
.about__now .dot-live {
  width: 7px;
  height: 7px;
  background: var(--accent-3);
  box-shadow: 0 0 10px var(--accent-3);
}
:root[data-theme="light"] .about__thrust--now .about__paper {
  border-color: rgba(var(--accent-3-rgb), 0.4);
}

/* the Now card's bottom row: same slot as the PAPERS chip row of the other cards */
.about__thrust-since {
  display: flex;
  align-items: center;
  gap: 0.75em;
  min-height: 30px;
  margin-top: auto;
  padding-top: var(--s-3);
  box-sizing: content-box;
  color: var(--text-2);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
}
.about__thrust-since .about__thrust-label {
  margin-right: 0;
  color: rgb(var(--accent-3-rgb));
  font-weight: 500;
}
:root[data-theme="light"] .about__thrust-since .about__thrust-label {
  color: color-mix(in srgb, rgb(var(--accent-3-rgb)) 62%, var(--text)); /* amber on white needs a darker ink for AA */
}
.about__since-period {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
@media (pointer: coarse) {
  .about__thrust-since {
    min-height: var(--tap);
  }
}

/* wide screens: give the cards a little more air */
@media (min-width: 1200px) {
  .about__thrust {
    padding: var(--s-5) 26px 26px;
  }
}

/* --------------------------------------------------------------------------
   Phones: compact thrust cards (icon + title share a row; paper chips scroll on one line)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .about__thrust {
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr) auto;
    grid-template-areas:
      "icon title idx"
      "text text text"
      "papers papers papers";
    align-items: center;
    gap: var(--s-2) 12px;
    padding: 18px;
  }
  .about__thrust-head {
    display: contents; /* icon + index/Now pill become grid items of the card */
  }
  .about__thrust-icon {
    grid-area: icon;
    width: 36px;
    height: 36px;
    border-radius: 10px;
  }
  .about__thrust-icon .icon {
    width: 18px;
    height: 18px;
  }
  .about__thrust-idx,
  .about__now {
    grid-area: idx;
  }
  .about__thrust-title {
    grid-area: title;
    font-size: var(--fs-lg);
    min-width: 0;
  }
  .about__thrust-text {
    grid-area: text;
  }
  .about__thrust-papers,
  .about__thrust-since {
    grid-area: papers;
    padding-top: 0;
    margin-top: var(--s-1);
  }
  .about__thrust-papers {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-block: 7px; /* room for the 44px tap target and the focus ring inside the scroller */
    margin-block: -7px 0;
    padding-inline-end: 40px;
    scrollbar-width: none;
    -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 36px), transparent);
    mask-image: linear-gradient(90deg, #000 calc(100% - 36px), transparent);
  }
  .about__thrust-papers::-webkit-scrollbar {
    display: none;
  }
  .about__thrust-papers > * {
    flex: none;
  }
}
@media (max-width: 480px) and (pointer: coarse) {
  .about__thrust-papers {
    padding-block: 0; /* the chips are already 44px tall on touch */
    margin-block: var(--s-1) 0;
  }
}

/* --------------------------------------------------------------------------
   Calm dark: no coloured glows; the amber "Current" tag is the only warm cue
   -------------------------------------------------------------------------- */
:root:not([data-theme="light"]) .about__tone {
  background:
    linear-gradient(180deg, rgba(var(--accent-rgb), 0.08), transparent 42%),
    linear-gradient(0deg, var(--veil), transparent 40%);
}
:root:not([data-theme="light"]) .about__now .dot-live {
  box-shadow: none;
}
:root:not([data-theme="light"]) .about__thrust-since .about__thrust-label {
  color: var(--text-3);
}
:root:not([data-theme="light"]) @media (hover: hover) and (pointer: fine) {
  :root:not([data-theme="light"]) .about__thrust:hover .about__thrust-icon {
    box-shadow: none;
  }
}

/* ---- portrait chrome: LIGHT keeps the viewfinder details, DARK shows the single caption above -------------------- */
/* faint scan-line sweep — runs only while on screen (.is-live) */
.about__scan {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  z-index: 1;
  height: 30%;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(var(--accent-rgb), 0.05) 82%, rgba(var(--accent-rgb), 0.18) 99%, transparent 100%);
  animation: about-scan 7.5s linear infinite;
  animation-play-state: paused;
}
.about__portrait.is-live .about__scan {
  animation-play-state: running;
}
@keyframes about-scan {
  0% {
    transform: translateY(-100%);
    opacity: 0;
  }
  8% {
    opacity: 1;
  }
  55% {
    transform: translateY(333%);
    opacity: 1;
  }
  56%,
  100% {
    transform: translateY(333%);
    opacity: 0;
  }
}
/* mono caption tags in three corners */
.about__tag {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.42em 0.65em;
  border: 1px solid var(--line);
  border-radius: var(--r-xs);
  background: var(--veil);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
  white-space: nowrap;
  pointer-events: none;
}
.about__tag[hidden] {
  display: none;
}
.about__tag--tl {
  top: 18px;
  left: 18px;
}
.about__tag--tr {
  top: 18px;
  right: 18px;
}
.about__tag--bl {
  bottom: 18px;
  left: 18px;
}
.about__rec {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--danger);
  box-shadow: 0 0 8px var(--danger);
  animation: about-rec 1.6s steps(1) infinite;
}
@keyframes about-rec {
  50% {
    opacity: 0.2;
  }
}
@media (prefers-reduced-motion: reduce) {
  .about__scan,
  .about__rec {
    animation: none;
  }
}
:root:not([data-theme="light"]) .about__scan,
:root:not([data-theme="light"]) .about__tag {
  display: none;
}
:root[data-theme="light"] .about__cap {
  display: none;
}