/* ==========================================================================
   CASE STUDY PAGES — 项目详情页
   依赖 site.css 的 tokens
   ========================================================================== */

.case-page { --head-h: 64px; }

/* 详情页导航 */
.case-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  height: 64px;
  padding-inline: var(--gut);

  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;

  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;

  background: rgba(242, 241, 238, .9);
  -webkit-backdrop-filter: blur(12px) saturate(1.05);
  backdrop-filter: blur(12px) saturate(1.05);
  border-bottom: 1px solid var(--line);
}

.case-brand { justify-self: start; letter-spacing: .24em; }

.case-links {
  display: flex;
  gap: 32px;
  justify-self: center;
}

.case-links a {
  opacity: .55;
  transition: opacity .3s var(--ease);
}

.case-links a:hover { opacity: 1; }

.case-back { justify-self: end; opacity: .8; }
.case-back:hover { opacity: 1; }

.case {
  padding-top: calc(var(--head-h) + clamp(48px, 7vw, 110px));
  padding-bottom: var(--sec-pad);
  max-width: calc(var(--maxw) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---- head ---- */
.case-head {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 40px);
  padding-bottom: clamp(32px, 4vw, 54px);
  border-bottom: 1px solid var(--line);
}

.case-index {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ink-3);
  padding-top: .5em;
}

.case-title {
  font-family: var(--display);
  font-weight: 300;
  font-size: clamp(42px, 7.4vw, 108px);
  line-height: .94;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.case-cn {
  font-family: var(--serif);
  font-size: clamp(14px, 1.4vw, 18px);
  letter-spacing: .16em;
  color: var(--ink-3);
  margin-top: 18px;
}

/* ---- meta strip ---- */
.case-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(32px, 4.5vw, 64px);
}

.case-meta div { display: grid; gap: 6px; }

.case-meta dt {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.case-meta dd {
  margin: 0;
  font-size: 13px;
  color: var(--ink);
}

/* ---- hero image ---- */
.case-hero {
  margin-bottom: clamp(36px, 5vw, 70px);
  overflow: hidden;
  background: var(--paper-2);
}

.case-hero img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---- intro text ---- */
.case-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 80px);
  align-items: start;
  padding-bottom: clamp(40px, 5vw, 72px);
}

.case-lead {
  font-family: var(--serif);
  font-size: clamp(17px, 1.8vw, 23px);
  line-height: 1.85;
  letter-spacing: .01em;
  color: var(--ink);
}

.case-lead + .case-lead { margin-top: 1em; }

.case-note {
  display: grid;
  gap: 18px;
  align-content: start;
  padding-top: 6px;
}

.case-note p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 40ch;
}

.case-note .label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: block;
  margin-bottom: 6px;
}

/* ---- plates：原始作品集页面流 ---- */
.case-plates {
  margin-top: clamp(48px, 6vw, 96px);
  padding-top: clamp(26px, 3vw, 42px);
  border-top: 1px solid var(--ink);
}

.plates-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: clamp(26px, 3.2vw, 46px);
}

.plates-title {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink);
}

.plates-note {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .14em;
  color: var(--ink-3);
}

.plates-flow {
  display: grid;
  gap: clamp(24px, 3vw, 44px);
  justify-items: center;
}

.plates-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(8px, 1.1vw, 14px);
  align-items: start;
}

.plate {
  margin: 0;
  width: 100%;
  max-width: 1200px;
  scroll-margin-top: 84px;
}

/* 右侧页码导航 */
.case-rail {
  position: fixed;
  right: clamp(10px, 1.4vw, 24px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 60;
  width: 48px;
  max-height: 62vh;
  overflow-y: auto;
  scrollbar-width: none;
  display: none;
}

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

@media (min-width: 1440px) {
  .case-rail { display: block; }
}

.case-rail ol {
  display: grid;
  gap: 5px;
  padding: 4px 0;
}

.case-rail a {
  display: block;
  opacity: .32;
  transition: opacity .35s var(--ease);
}

.case-rail a:hover { opacity: .75; }
.case-rail a.is-current { opacity: 1; }

.case-rail img {
  width: 100%;
  display: block;
  background: #fff;
  outline: 1px solid rgba(14,14,12,.08);
}

/* 底部进度条 */
.case-progress {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: rgba(14, 14, 12, .1);
  z-index: 70;
}

.case-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--ink);
  transition: width .12s linear;
}

.plate a { display: block; }

.plate img {
  width: 100%;
  height: auto;
  display: block;
  background: #fff;
  transition: opacity .4s var(--ease);
}

.plate a:hover img { opacity: .88; }

.plate figcaption {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .12em;
  color: var(--ink-3);
  padding-top: 8px;
  text-align: right;
}

/* 竖版页面窄一些，避免过高 */
.plate--portrait { max-width: 740px; }

.plates-grid .plate { max-width: none; }
.plates-grid .plate figcaption { font-size: 8px; text-align: center; }

/* ---- experiment block ---- */
.case-exp {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(28px, 3.6vw, 52px) 0 clamp(44px, 6vw, 84px);
  margin-bottom: clamp(40px, 5vw, 72px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.exp-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 22px;
  align-items: baseline;
}

.exp-kicker {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
}

.exp-title {
  font-family: var(--display);
  font-weight: 300;
  font-size: clamp(26px, 3.4vw, 46px);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.exp-cn {
  grid-column: 2;
  font-family: var(--serif);
  font-size: 12.5px;
  letter-spacing: .2em;
  color: var(--ink-3);
}

.exp-body {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: start;
}

.exp-media {
  overflow: hidden;
  background: var(--paper-2);
}

.exp-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.exp-media figcaption {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 9px;
}

.exp-text {
  display: grid;
  gap: 18px;
  padding-top: 4px;
}

.exp-text p {
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--ink-2);
  max-width: 44ch;
}

.exp-facts {
  display: grid;
  gap: 0;
  margin-top: 4px;
  border-top: 1px solid var(--line);
}

.exp-facts div {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.exp-facts dt {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 3px;
}

.exp-facts dd {
  margin: 0;
  font-size: 12.5px;
  color: var(--ink);
}

@media (max-width: 900px) {
  .exp-body { grid-template-columns: 1fr; }
  .exp-media { max-width: 520px; }
}

@media (max-width: 600px) {
  .exp-head { grid-template-columns: 1fr; gap: 10px; }
  .exp-cn { grid-column: 1; }
}

/* ---- next / prev ---- */
.case-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: clamp(56px, 8vw, 110px);
  padding-top: 24px;
  border-top: 1px solid var(--ink);
}

.case-next a {
  display: grid;
  gap: 8px;
  transition: color .4s var(--ease);
}

.case-next a:last-child { text-align: right; justify-items: end; }

.case-next .nlabel {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.case-next .ntitle {
  font-size: clamp(17px, 2vw, 26px);
  letter-spacing: -0.015em;
}

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

/* ---- case footer ---- */
.case-foot {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 40px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

@media (max-width: 900px) {
  .case-head { grid-template-columns: 1fr; gap: 10px; }
  .case-index { padding-top: 0; }
  .case-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .case-intro { grid-template-columns: 1fr; gap: 26px; }
  .plates-grid { grid-template-columns: 1fr; }
  .case-hero img { aspect-ratio: 4 / 3; }
}

@media (max-width: 600px) {
  .case-next { grid-template-columns: 1fr; gap: 28px; }
  .case-next a:last-child { text-align: left; justify-items: start; }
  .case-meta { grid-template-columns: 1fr 1fr; }
  .plate--portrait { max-width: 100%; }
}