/* ============================================================
   Jenny Chan — Case page 2026 (light edition)
   Isolated from legacy real-case.* — shares home design tokens
   Seamless full-width image stream
   ============================================================ */

:root {
  --bg: #fafaf8;
  --bg-card: #ffffff;
  --bg-chip: rgba(24, 24, 27, 0.04);
  --text: #18181b;
  --text-dim: #6f6f76;
  --line: rgba(24, 24, 27, 0.1);
  --line-strong: rgba(24, 24, 27, 0.22);
  --accent: #ea3f76;
  --accent-soft: rgba(234, 63, 118, 0.5);

  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", monospace;

  --container: 1152px;
  --pad-x: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

.case-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 0 0 10px 0;
  z-index: 300;
}

.case-skip:focus {
  left: 0;
}

/* ambient floating orbs, shared design language with home */
.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.ambient i {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  will-change: transform;
}

.ambient i:nth-child(1) {
  width: 420px;
  height: 420px;
  top: 6%;
  left: -8%;
  background: radial-gradient(circle, rgba(234, 63, 118, 0.14) 0%, rgba(234, 63, 118, 0.04) 45%, transparent 70%);
  animation: orb-drift-a 26s ease-in-out infinite;
}

.ambient i:nth-child(2) {
  width: 340px;
  height: 340px;
  top: 52%;
  right: -6%;
  background: radial-gradient(circle, rgba(242, 104, 58, 0.12) 0%, rgba(242, 104, 58, 0.04) 45%, transparent 70%);
  animation: orb-drift-b 32s ease-in-out infinite;
}

@keyframes orb-drift-a {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(70px, 50px) scale(1.12);
  }
  66% {
    transform: translate(-40px, 90px) scale(0.94);
  }
}

@keyframes orb-drift-b {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  40% {
    transform: translate(-80px, -60px) scale(1.1);
  }
  70% {
    transform: translate(30px, 40px) scale(0.92);
  }
}

/* ============ nav ============ */
.case-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 248, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.case-nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  height: 64px;
  padding: 0 var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.case-nav__back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-dim);
  transition: color 0.25s ease;
}

.case-nav__back:hover {
  color: var(--text);
}

.case-nav__back span:first-child {
  transition: transform 0.25s ease;
}

.case-nav__back:hover span:first-child {
  transform: translateX(-3px);
}

.case-nav__label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.case-nav__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.case-nav__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 100%;
  background: var(--accent);
  transform-origin: left;
  transform: scaleX(0);
}

/* ============ intro ============ */
.case-intro {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: calc(64px + 96px) var(--pad-x) 72px;
}

/* signature warm glow, same family as the home hero */
.case-intro::after {
  content: "";
  position: absolute;
  top: 30px;
  right: 4%;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle at 60% 30%, rgba(245, 205, 81, 0.28), rgba(234, 63, 118, 0.12) 55%, transparent 75%);
  filter: blur(30px);
  pointer-events: none;
  z-index: -1;
}

@keyframes eyebrow-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes eyebrow-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

.case-intro__eyebrow {
  position: relative;
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  padding: 9px 18px;
  margin-bottom: 28px;
  opacity: 0;
}

.case-reveal.is-visible .case-intro__eyebrow {
  animation: eyebrow-in 0.65s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both,
    eyebrow-float 4s ease-in-out 0.85s infinite;
  opacity: 1;
}

.case-intro__eyebrow .corner {
  position: absolute;
  width: 7px;
  height: 7px;
  border: 1px solid var(--accent);
  background: var(--bg);
}

.case-intro__eyebrow .corner.tl { top: -4px; left: -4px; }
.case-intro__eyebrow .corner.tr { top: -4px; right: -4px; }
.case-intro__eyebrow .corner.bl { bottom: -4px; left: -4px; }
.case-intro__eyebrow .corner.br { bottom: -4px; right: -4px; }

.case-intro__title {
  font-size: clamp(40px, 5.4vw, 66px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin-bottom: 22px;
  min-height: 1.1em;
}

.caret {
  display: inline-block;
  width: 3px;
  height: 0.9em;
  margin-left: 4px;
  background: var(--accent);
  vertical-align: -0.06em;
  animation: caret-blink 1s steps(2) infinite;
}

@keyframes caret-blink {
  50% { opacity: 0; }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.case-intro__statement {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 500;
  letter-spacing: -0.015em;
  margin-bottom: 16px;
}

.case-intro__statement em {
  font-style: normal;
  color: var(--accent);
}

.case-intro__summary {
  max-width: 576px;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1.625;
}

/* facts */
.case-facts {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad-x) 64px;
}

.case-facts dl {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.case-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.case-facts dd {
  font-size: 15px;
  font-weight: 500;
}

/* ============ live playable demo (phone frame) ============ */
.case-play {
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px var(--pad-x) 80px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 56px;
  align-items: center;
}

.case-play__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #3d9a67;
  border: 1px solid rgba(61, 154, 103, 0.35);
  background: rgba(61, 154, 103, 0.08);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 20px;
}

.case-play__chip i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3d9a67;
}

.case-play__copy h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.case-play__copy p {
  color: var(--text-dim);
  font-size: 17px;
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 26px;
}

.case-play__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  border-radius: 12px;
  padding: 12px 22px;
  box-shadow: 0 0 20px rgba(234, 63, 118, 0.3);
  transition: background 0.25s ease, transform 0.25s ease;
}

.case-play__btn:hover {
  background: #d12f64;
  transform: translateY(-2px);
}

.case-play__phone {
  width: min(380px, 100%);
  margin: 0 auto;
  aspect-ratio: 390 / 800;
  background: #17161c;
  border-radius: 48px;
  padding: 12px;
  box-shadow: 0 30px 70px rgba(24, 24, 27, 0.28), 0 4px 14px rgba(24, 24, 27, 0.14);
  position: relative;
}

.case-play__phone::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: 104px;
  height: 24px;
  background: #17161c;
  border-radius: 999px;
  z-index: 2;
}

.case-play__screen {
  width: 100%;
  height: 100%;
  border-radius: 38px;
  overflow: hidden;
  background: #fff;
}

.case-play__screen iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

@media (max-width: 900px) {
  .case-play {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* ============ sub-module directory (index rows) ============ */
.case-modules {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad-x) 72px;
}

.case-modules__head {
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.case-modules__sub {
  color: var(--text-dim);
  font-size: 15px;
  margin-bottom: 28px;
}

.case-modules__grid {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.case-module {
  display: grid;
  grid-template-columns: 72px minmax(0, 1.1fr) minmax(0, 1.4fr) auto;
  align-items: center;
  gap: 20px;
  padding: 26px 10px;
  border-bottom: 1px solid var(--line);
  transition: background 0.25s ease, padding 0.25s ease;
}

a.case-module:hover {
  background: var(--bg-chip);
  padding-left: 18px;
  padding-right: 18px;
}

.case-module__num {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text-dim);
  transition: color 0.25s ease;
}

a.case-module:hover .case-module__num {
  color: var(--accent);
}

.case-module__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.case-module__text strong {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.case-module__text small {
  display: none;
}

.case-module__desc {
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.5;
}

.case-module__arrow {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  transition: transform 0.25s ease, color 0.25s ease;
}

a.case-module:hover .case-module__arrow {
  transform: translateX(3px);
  color: var(--accent);
}

.case-module--soon {
  opacity: 0.55;
  cursor: default;
}

.case-module__badge {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  white-space: nowrap;
}

.case-module__badge--inline {
  justify-self: auto;
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 42%, var(--line));
  font-size: 10px;
  line-height: 1;
  padding: 4px 9px;
}

@media (max-width: 760px) {
  .case-module {
    grid-template-columns: 44px minmax(0, 1fr) auto;
    gap: 12px;
    padding: 20px 4px;
  }

  .case-module__desc {
    display: none;
  }

  .case-module__text small {
    display: block;
    color: var(--text-dim);
    font-size: 13px;
  }
}

/* ============ module switcher rail (didi sub-pages) ============ */
.didi-module-page main {
  padding-top: calc(64px + 40px);
}

.case-rail {
  position: sticky;
  top: 64px;
  z-index: 90;
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  background: rgba(250, 250, 248, 0.9);
  border-bottom: 1px solid rgba(20, 20, 20, 0.08);
  backdrop-filter: blur(16px) saturate(1.08);
  -webkit-backdrop-filter: blur(16px) saturate(1.08);
}

.case-rail a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dim);
  border: 1px solid var(--line);
  background: var(--bg-card);
  border-radius: 999px;
  padding: 9px 18px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.case-rail a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
}

.case-rail a:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.case-rail a.is-current {
  color: var(--accent);
  border-color: var(--accent-soft);
  background: rgba(234, 63, 118, 0.06);
}

.case-rail a.is-current span {
  color: var(--accent);
}

.case-rail + .case-intro {
  padding-top: 36px;
}

/* in-page filter tabs (sticky under nav) */
.case-tabs {
  position: sticky;
  top: 64px;
  z-index: 50;
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  background: rgba(250, 250, 248, 0.82);
  backdrop-filter: blur(14px);
}

.case-tabs button {
  font: 500 14px/1 var(--font-body);
  color: var(--text-dim);
  border: 1px solid var(--line);
  background: var(--bg-card);
  border-radius: 999px;
  padding: 10px 18px;
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.case-tabs button:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.case-tabs button.is-active {
  color: var(--accent);
  border-color: var(--accent-soft);
  background: rgba(234, 63, 118, 0.06);
}

/* pink focus ring on interactive elements (override browser default) */
.case-tabs button:focus-visible,
.case-footer__link:focus-visible,
.case-nav__back:focus-visible,
.case-module:focus-visible,
.case-rail a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.case-tabs button {
  -webkit-tap-highlight-color: rgba(234, 63, 118, 0.15);
}

.case-stream figure[hidden] {
  display: none;
}

/* mobile: single-row swipeable tab bar instead of wrapping */
@media (max-width: 640px) {
  .case-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 10px var(--pad-x);
    scroll-snap-type: x proximity;
    -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 14px, #000 calc(100% - 14px), transparent 100%);
    mask-image: linear-gradient(90deg, transparent 0, #000 14px, #000 calc(100% - 14px), transparent 100%);
  }

  .case-tabs::-webkit-scrollbar {
    display: none;
  }

  .case-tabs button {
    flex: 0 0 auto;
    white-space: nowrap;
    font-size: 13px;
    padding: 9px 15px;
    scroll-snap-align: start;
  }

  .case-rail {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .case-rail::-webkit-scrollbar {
    display: none;
  }

  .case-rail a {
    flex: 0 0 auto;
    white-space: nowrap;
  }
}

/* ============ seamless image stream ============ */
.case-stream {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  font-size: 0; /* kill inline gaps — seamless stack */
}

.case-stream figure {
  margin: 0;
  position: relative;
}

.case-stream__link {
  display: block;
}

.case-stream__link:focus-visible {
  outline: 3px solid var(--freight-orange);
  outline-offset: 4px;
}

.case-stream__hotspot {
  position: absolute;
  z-index: 2;
  left: var(--hotspot-left);
  top: var(--hotspot-top);
  width: var(--hotspot-width);
  height: var(--hotspot-height);
  border-radius: 999px;
}

.case-stream__hotspot:focus-visible {
  outline: 3px solid var(--freight-orange);
  outline-offset: 3px;
}

.case-stream img,
.case-stream video {
  width: 100%;
  height: auto;
}

.case-stream video {
  background: #000;
}

/* ============ footer ============ */
.case-footer {
  max-width: var(--container);
  margin: 0 auto;
  padding: 72px var(--pad-x) 48px;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.case-footer__link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 24px;
  min-width: min(300px, 100%);
  transition: border-color 0.3s ease, transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.3s ease;
}

.case-footer__link > span:last-child {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
}

.case-footer__link:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(24, 24, 27, 0.08);
}

.case-footer__link small {
  display: none;
}

.case-footer__link strong {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.case-footer__arrow {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 16px;
  color: var(--accent);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.case-footer__link:hover .case-footer__arrow {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.case-footer__link--next {
  text-align: center;
  margin-left: auto;
  flex-direction: row-reverse;
}

.case-footer__link--next > span:last-child {
  align-items: center;
}

/* copyright */
.case-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad-x) 36px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  text-align: center;
}

/* ---- reveal ---- */
.case-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ============ responsive ============ */
@media (max-width: 860px) {
  .case-nav__label {
    display: none;
  }

  .case-facts dl {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px 16px;
  }

  .case-footer__link {
    width: 100%;
  }

  .case-footer__link--next {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .case-reveal {
    opacity: 1;
    transform: none;
  }
}