/* =========================================================
   Identity: editorial index for a client-facing portfolio.
   Palette: warm canvas neutrals with one restrained ink-blue accent.
   ========================================================= */
:root {
  --bg: #f5f4ed;
  --bg-stage: #e8e6dc;
  --surface: #faf9f5;
  --ink: #141413;
  --ink-soft: #504e49;
  --ink-faint: #6b6a64;
  --hair: #d8d6cc;

  --accent: #1b365d;
  --accent-light: #2d5a8a;
  --accent-pale: #b9c9dc;
  --viewer-ink: #faf9f5;

  --font-display: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --topbar-h: 204px;
  --bottom-h: 64px;
  --pad: clamp(20px, 3.4vw, 48px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
img { -webkit-user-drag: none; }

body {
  background: var(--bg-stage);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px; line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: grid;
  grid-template-rows: var(--topbar-h) 1fr var(--bottom-h);
  min-height: 100vh; overflow: hidden;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
button:disabled { cursor: default; }
body.has-overlay { overflow: hidden; }

.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none; opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: relative; z-index: 3;
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: clamp(20px, 3vw, 40px) var(--pad) 0;
}
.brand {
  line-height: 0;
}
.brand a {
  display: inline-block;
  transition: transform 0.35s var(--ease);
}
.brand__logo {
  display: block;
  width: 396px;
  height: auto;
}
.topnav { display: flex; gap: clamp(18px, 2.4vw, 32px); padding-top: 14px; }
.topnav a, .topnav button { font-family: var(--font-display); font-weight: 500; font-size: 0.95rem; position: relative; padding-bottom: 2px; }
.topnav a::after, .topnav button::after { content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0; background: var(--accent); transition: width 0.3s var(--ease); }
.topnav a:hover::after, .topnav button:hover::after { width: 100%; }
.topnav a.is-current { color: var(--accent); }
.topnav a.is-current::after { width: 100%; background: var(--accent); }
.sep { color: var(--ink); margin: 0 1px; }

/* ---------------- 主体布局 ---------------- */
.layout {
  position: relative; z-index: 2;
  display: grid;
  grid-template-columns: minmax(180px, 0.8fr) minmax(340px, 1.4fr) minmax(220px, 0.9fr);
  grid-template-areas: "index stage meta";
  align-items: center;
  gap: clamp(16px, 2.5vw, 40px);
  padding: 0 var(--pad);
  min-height: 0; overflow: hidden;
}
.index { grid-area: index; }
.stage { grid-area: stage; }
.meta { grid-area: meta; }

/* 左栏索引: obys 小号、浅灰、常规字重、纯文字、无框无线 */
.index { max-height: 100%; overflow-y: auto; scrollbar-width: none; padding: 8px 0; }
.index::-webkit-scrollbar { display: none; }
.index__list { display: flex; flex-direction: column; gap: 2px; }
.index__btn {
  display: block; width: 100%; text-align: left;
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(0.95rem, 1.15vw, 1.15rem);
  color: var(--ink-soft); line-height: 1.32;
  padding: 1px 0;
  transition: color 0.35s var(--ease);
}
.index__label { position: relative; display: inline-block; padding-bottom: 1px; }
.index__label::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: var(--accent);
  transition: width 0.3s var(--ease);
}
.index__btn:hover { color: var(--accent); }
.index__btn:hover .index__label::after { width: 100%; }
.index__item.is-active .index__btn { color: var(--accent); font-weight: 700; padding-left: 0; }
.index__item.is-active .index__label::after { width: 100%; }

/* 中栏图像带 + 大括号 */
.stage { position: relative; display: flex; align-items: center; justify-content: center; gap: clamp(8px, 1.6vw, 22px); min-height: 0; height: 100%; }
.filmstrip {
  --slot-shift: clamp(390px, 55dvh, 1180px);
  position: relative;
  display: grid; place-items: center;
  width: min(100%, 500px); height: 100%; min-height: 0;
  overflow: visible;
  clip-path: inset(0 -80px);
  padding: 28px;
}
.stack-slot {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 1;
  opacity: 0.32;
  transform: translate3d(0, 0, 0) scale(0.72);
  transition:
    transform 0.58s var(--ease),
    opacity 0.4s var(--ease);
  will-change: transform, opacity;
}
.stack-slot.is-previous {
  transform: translate3d(0, calc(-1 * var(--slot-shift)), 0) scale(0.72);
}
.stack-slot.is-center {
  z-index: 3;
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
}
.stack-slot.is-next {
  transform: translate3d(0, var(--slot-shift), 0) scale(0.72);
}
.stack-slot.is-before {
  opacity: 0;
  transform: translate3d(0, calc(-2 * var(--slot-shift)), 0) scale(0.62);
}
.stack-slot.is-after {
  opacity: 0;
  transform: translate3d(0, calc(2 * var(--slot-shift)), 0) scale(0.62);
}
.stack-slot.is-entering {
  opacity: 0;
}
.filmstrip.is-moving .stack {
  pointer-events: none;
}
/* 图片组: 一叠带旋转的照片(3 张), 封面置顶, 整叠只有一张柔和阴影 */
.stack {
  position: relative; display: block;
  width: min(
    clamp(250px, 29vw, 410px),
    calc((100dvh - var(--topbar-h) - var(--bottom-h) - 72px) * 0.8)
  );
  max-width: 100%;
  aspect-ratio: 18 / 23;
  cursor: pointer;
  filter: drop-shadow(0 18px 32px rgba(63, 42, 36, 0.24));
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
  will-change: transform;
}
.stack > * {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: contain; border-radius: 4px; display: block;
  transform-origin: 50% 50%;
  transition: transform 0.5s var(--ease), opacity 0.24s ease-out;
}
/* 3 张精确还原截图: 右后(顺时针微倾) / 左后(逆时针更倾) / 顶(微倾) */
.stack > :nth-child(1) { transform: rotate(4deg) translate(5%, -1%); }
.stack > :nth-child(2) { transform: rotate(-7deg) translate(-6%, 1.5%); }
.stack > :nth-child(3) { transform: none; }
/* 当前项目始终保持为唯一的主视觉 */
.stack.is-focus { cursor: zoom-in; }
/* 聚焦组 hover: 卡片微微张开, 提示可点开 */
.stack.is-focus:hover > :nth-child(1) { transform: rotate(6deg) translate(7%, 0%); }
.stack.is-focus:hover > :nth-child(2) { transform: rotate(-10deg) translate(-9%, 2.5%); }
.stack.is-focus:hover > :nth-child(3) { transform: none; }
.stack.is-focus:hover { transform: translate3d(0, -3px, 0); }
.stack.is-focus:active { transform: translate3d(0, 0, 0) scale(0.985); }
/* 图片组保留独立焦点提示，避免键盘用户在叠图中失去当前位置。 */
.stack:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 6px;
  border-radius: 4px;
}
.stack > img {
  outline: 1px solid oklch(0 0 0 / 0.1);
  outline-offset: -1px;
}
.stack-slot:not(.is-center) .stack {
  filter: drop-shadow(0 10px 20px rgba(63, 42, 36, 0.14));
  cursor: default;
}
.stack-slot:not(.is-center) .stack > :nth-child(1),
.stack-slot:not(.is-center) .stack > :nth-child(2),
.stack.is-collapsing > :nth-child(1),
.stack.is-collapsing > :nth-child(2),
.stack.is-arriving > :nth-child(1),
.stack.is-arriving > :nth-child(2) {
  opacity: 0;
  transform: none;
}
.stack-slot:not(.is-center) .stack > :nth-child(3),
.stack.is-collapsing > :nth-child(3),
.stack.is-arriving > :nth-child(3) {
  transform: none;
}
.stack.is-collapsing > * {
  transition-duration: 0.22s;
}

.bracket {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(4rem, 8vw, 7rem); line-height: 1; color: var(--ink);
  padding: 0 4px; user-select: none;
  transition: color 0.4s var(--ease), transform 0.45s var(--ease);
}
.bracket:hover { color: var(--accent); transform: scale(1.06); }
.bracket:active { transform: scale(0.92); }
.bracket--l { transform-origin: right center; }
.bracket--r { transform-origin: left center; }

/* 右栏 meta: 分类+项目介绍(上) / 大数字(下) */
.meta { position: relative; height: 100%; display: flex; flex-direction: column; justify-content: space-between; align-items: flex-end; padding: clamp(40px, 8vh, 90px) 0; }
.meta__top { max-width: 300px; align-self: flex-start; }
.meta__cat { font-family: var(--font-display); font-weight: 600; font-size: 0.95rem; color: var(--accent); margin-bottom: 20px; }
.meta__facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 20px; }
.meta__facts dt { margin-bottom: 3px; font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); }
.meta__facts dd { font-size: 0.78rem; line-height: 1.45; color: var(--ink); }
.meta__desc-label { display: none; }
.meta__desc { font-size: 0.84rem; line-height: 1.6; color: var(--ink); }
.meta__open {
  margin-top: 22px; padding-bottom: 3px;
  border-bottom: 1px solid currentColor;
  font-size: 0.82rem; font-weight: 600; color: var(--accent);
  transition: color 0.35s var(--ease), transform 0.35s var(--ease), letter-spacing 0.35s var(--ease);
}
.meta__open:active { transform: translateY(1px); }
.meta__num { font-family: var(--font-display); font-weight: 500; font-size: 0.95rem; color: var(--ink); font-variant-numeric: tabular-nums; }
.meta__total { color: var(--ink-soft); }

/* ---------------- 底栏 ---------------- */
.bottombar {
  position: relative; z-index: 3;
  display: grid; grid-template-columns: 1fr auto; align-items: end;
  padding: 0 var(--pad) clamp(14px, 2.4vh, 24px);
}
.copy {
  font-family: var(--font-display);
  font-size: 0.7rem;
  line-height: 1;
  letter-spacing: 0.035em;
  color: var(--ink-faint);
}
.socials { display: flex; align-items: center; gap: 8px; }
.socials__item { position: relative; display: flex; align-items: center; z-index: 0; }
.social-icon {
  position: relative;
  display: block;
  width: 26px; height: 26px;
  user-select: none;
}
.social-icon::before,
.social-icon::after {
  content: "";
  position: absolute; inset: 0;
  transition: opacity 0.28s var(--ease), transform 0.34s var(--ease), filter 0.28s var(--ease);
}
.social-icon::before {
  background: var(--ink-faint);
  -webkit-mask: var(--social-mask, var(--social-source)) center / contain no-repeat;
  mask: var(--social-mask, var(--social-source)) center / contain no-repeat;
}
.social-icon::after {
  opacity: 0;
  background: var(--social-source) center / contain no-repeat;
}
.social-icon:hover::before { opacity: 0; transform: scale(0.94); }
.social-icon:hover::after { opacity: 1; transform: scale(1.04); }
.social-icon--wechat { --social-source: url("../icons/wechat-official.svg"); }
.social-icon--xiaohongshu {
  --social-source: url("../icons/xiaohongshu.svg");
  width: 23.4px;
  height: 23.4px;
}
.social-icon--douyin {
  --social-source: url("../icons/douyin.svg");
  width: 28px;
  height: 28px;
}
.social-icon--douyin::before { display: none; }
.social-icon--douyin::after {
  opacity: 0.58;
  filter: grayscale(1) saturate(0);
}
.social-icon--douyin:hover::after {
  opacity: 1;
  filter: none;
}
.socials__item:hover,
.socials__item:focus-within { z-index: 40; }
.social-qr {
  position: absolute;
  right: 0;
  bottom: calc(100% + 14px);
  z-index: 10;
  width: 220px;
  max-width: calc(100vw - 32px);
  padding: 10px;
  border: 1px solid var(--hair);
  border-radius: 10px 10px 4px 10px;
  background: var(--surface);
  box-shadow: 0 16px 36px rgba(20, 20, 19, 0.18);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate3d(0, 10px, 0) scale(0.96);
  transform-origin: right bottom;
  transition: opacity 0.24s var(--ease), visibility 0.24s var(--ease), transform 0.32s var(--ease);
}
.social-qr::before,
.social-qr::after {
  content: "";
  position: absolute;
  right: 13px;
  width: 26px;
  height: 18px;
  pointer-events: none;
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}
.social-qr::before {
  bottom: -15px;
  background: var(--hair);
}
.social-qr::after {
  right: 14px;
  bottom: -13px;
  width: 24px;
  height: 16px;
  background: var(--surface);
}
.socials__item:hover .social-qr,
.socials__item:focus-within .social-qr {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate3d(0, 0, 0) scale(1);
}
.social-qr img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #fff;
}
.social-qr__label {
  display: block;
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 0.74rem;
  line-height: 1.2;
  text-align: center;
  letter-spacing: 0.04em;
}

/* ---------------- Grid 浮层 ---------------- */
.gridview {
  position: fixed; inset: var(--topbar-h) 0 var(--bottom-h) 0; z-index: 5;
  background: var(--bg-stage); padding: clamp(16px, 3vw, 40px) var(--pad);
  display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 22px 18px; align-content: start; overflow-y: auto;
}
.gridview[hidden] { display: none; }
.gridview__item { display: block; width: 100%; text-align: left; }
.gridview figure { cursor: pointer; }
.gridview img {
  width: 100%; aspect-ratio: 4/5; object-fit: cover; border-radius: 2px;
  outline: 1px solid oklch(0 0 0 / 0.1);
  outline-offset: -1px;
  transition: transform 0.4s var(--ease);
}
.gridview__item:hover img { transform: scale(1.03); }
.gridview__item:active img { transform: scale(0.985); }
.gridview figcaption {
  margin-top: 8px; font-family: var(--font-display); font-weight: 500; font-size: 0.9rem;
  transition: color 0.35s var(--ease), transform 0.4s var(--ease);
}
.gridview figcaption span { color: var(--ink-soft); font-family: var(--font-body); font-weight: 400; font-size: 0.78rem; }

/* ---------------- About / Contact ---------------- */
.info-panel {
  position: fixed; inset: 0; z-index: 20;
  display: grid; place-items: center;
  padding: clamp(24px, 6vw, 88px);
  background: rgba(250, 249, 245, 0.98);
}
.info-panel[hidden] { display: none; }
.info-panel__inner { width: min(100%, 900px); }
.info-panel__label { margin-bottom: clamp(28px, 5vh, 64px); color: var(--accent); font-size: 0.82rem; font-weight: 600; }
.info-panel h2 {
  max-width: 830px; font-family: var(--font-display); font-size: clamp(2.7rem, 7vw, 6.8rem);
  font-weight: 600; letter-spacing: -0.055em; line-height: 0.92;
}
.info-panel__lead { max-width: 560px; margin-top: clamp(28px, 5vh, 56px); font-size: clamp(1rem, 1.35vw, 1.2rem); line-height: 1.65; color: var(--ink); }
.info-panel__details { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 48px; max-width: 680px; margin-top: 32px; }
.info-panel__details dt { margin-bottom: 6px; color: var(--ink-soft); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }
.info-panel__details dd { font-size: 0.92rem; }
.info-panel__mail { display: inline-block; margin-top: 34px; color: var(--accent); font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 2.7rem); border-bottom: 1px solid currentColor; }
.info-panel__close {
  position: absolute; top: clamp(20px, 3vw, 40px); right: var(--pad);
  padding: 6px 0; border-bottom: 1px solid var(--ink-soft);
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.12em;
  transition: color 0.35s var(--ease), border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

@media (min-width: 921px) and (hover: hover) {
  .brand a:hover { color: var(--accent); transform: translate3d(0, -2px, 0); }
  .brand a:active { transform: translate3d(0, 0, 0) scale(0.985); }
  .meta__open:hover { color: var(--accent-light); letter-spacing: 0.045em; transform: translate3d(4px, 0, 0); }
  .gridview__item:hover figcaption { color: var(--accent); transform: translate3d(4px, 0, 0); }
  .info-panel__close:hover { color: var(--accent); border-color: var(--accent); transform: translate3d(0, -2px, 0); }
}

@media (min-width: 921px) {
  .meta__facts {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 18px;
  }
  .meta__facts dt,
  .meta__desc-label {
    margin-bottom: 5px;
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-soft);
  }
  .meta__desc-label { display: block; }
  .meta__facts dd,
  .meta__desc { font-size: 0.84rem; line-height: 1.6; }
}

/* ---------------- 横向视图 ---------------- */
.layout.view-horizontal .stack {
  width: min(
    clamp(270px, 31vw, 430px),
    calc((100dvh - var(--topbar-h) - var(--bottom-h) - 72px) * 0.8)
  );
}
.layout.view-horizontal {
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "stage";
}
.layout.view-horizontal .index,
.layout.view-horizontal .meta {
  position: absolute; visibility: hidden; opacity: 0; pointer-events: none;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 920px) {
  :root { --topbar-h: 124px; --bottom-h: 64px; --pad: clamp(18px, 5vw, 32px); }
  html, body { height: auto; min-height: 100%; }
  body {
    display: block; min-height: 100dvh;
    background: var(--bg-stage);
    overflow-x: hidden; overflow-y: auto;
  }
  .topbar {
    min-height: var(--topbar-h); align-items: flex-start;
    padding-top: 20px;
  }
  .brand__logo { width: 244px; height: auto; }
  .topnav { gap: clamp(12px, 4vw, 22px); padding-top: 8px; }
  .topnav a, .topnav button { font-size: 0.8rem; }
  .layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "stage" "meta" "index";
    align-items: start; gap: 28px;
    min-height: 0; padding: 12px var(--pad) 40px;
    overflow: visible;
  }
  .stage {
    height: auto; min-height: clamp(390px, 64dvh, 560px);
    width: 100%; overflow: hidden;
  }
  .filmstrip {
    width: 100%; height: auto; min-height: inherit;
    overflow: visible; clip-path: none; padding: 34px;
  }
  .stack-slot {
    position: static;
    inset: auto;
    display: none;
    width: 100%;
    min-height: inherit;
    opacity: 1;
    transform: none;
    transition: none;
  }
  .stack-slot.is-center {
    display: grid;
    transform: none;
  }
  .stack,
  .layout.view-horizontal .stack {
    width: min(74vw, 320px);
    max-width: calc(100vw - 104px);
  }
  .bracket {
    position: absolute; z-index: 2; top: 50%;
    font-size: clamp(3.2rem, 15vw, 5rem);
  }
  .bracket--l { left: 0; transform: translateY(-50%); }
  .bracket--r { right: 0; transform: translateY(-50%); }
  .bracket:hover { transform: translateY(-50%); }
  .meta {
    height: auto; display: grid; grid-template-columns: 1fr auto;
    align-items: start; gap: 24px; padding: 0;
  }
  .meta__top { max-width: 620px; }
  .meta__num { padding-top: 1px; }
  .meta__facts { max-width: 420px; }
  .index { max-height: none; overflow-x: auto; padding: 4px 0 8px; scroll-snap-type: x proximity; }
  .index__list { width: max-content; min-width: 100%; flex-direction: row; flex-wrap: nowrap; gap: 18px; }
  .index__item { scroll-snap-align: start; }
  .index__btn { white-space: nowrap; font-size: 0.94rem; }
  .bottombar {
    position: relative; min-height: var(--bottom-h);
    padding: 0 var(--pad) 18px;
  }
  .copy { font-size: 0.75rem; }
  .gridview {
    inset: var(--topbar-h) 0 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 12px; padding: 24px var(--pad) 48px;
  }
  .info-panel { align-items: start; padding: 92px var(--pad) 40px; overflow-y: auto; }
  .info-panel h2 { font-size: clamp(2.7rem, 13vw, 4.8rem); }
  .info-panel__details { grid-template-columns: 1fr; }
  .info-panel__mail { overflow-wrap: anywhere; }
}

@media (max-width: 480px) {
  :root { --topbar-h: 164px; }
  .topnav {
    position: absolute;
    top: 136px;
    right: var(--pad);
    padding-top: 0;
  }
}

/* ---------------- focus / a11y ---------------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

/* ---------------- viewer: 移动端单张浏览，桌面左文右图 ---------------- */
.viewer {
  position: fixed; inset: 0; z-index: 30;
  background: rgba(20, 20, 19, 0.72);
  backdrop-filter: blur(20px) saturate(1.05);
  -webkit-backdrop-filter: blur(20px) saturate(1.05);
  display: flex; align-items: center; justify-content: center;
  padding: clamp(24px, 5vw, 64px);
}
.viewer[hidden] { display: none; }
.viewer.is-preparing { visibility: hidden; }
.viewer.is-preparing .viewer__track { transition: none; }
.viewer.is-preparing .viewer__slide:not(:first-child),
.viewer.is-preparing .viewer__caption > * { opacity: 0; }
.viewer__gallery { display: contents; }
.viewer__viewport {
  width: var(--viewer-width, min(56vw, 520px));
  height: var(--viewer-height, min(80vh, 720px));
  overflow: hidden; border-radius: 4px;
  box-shadow: 0 30px 80px rgba(20, 20, 19, 0.48);
  transform-origin: center center;
  will-change: transform, opacity;
}
.viewer__progressive-blur { display: none; }
.viewer__track { display: flex; height: 100%; transition: transform 0.42s var(--ease); will-change: transform; }
.viewer__track.is-jumping { transition: none; }
.viewer__track.is-jumping img { transition: none; }
.viewer__slide { position: relative; flex: 0 0 100%; width: 100%; height: 100%; min-width: 0; }
.viewer__track img {
  width: 100%; height: 100%; object-fit: contain; display: block;
  outline: 1px solid oklch(1 0 0 / 0.1);
  outline-offset: -1px;
  transition:
    opacity 0.58s var(--ease),
    filter 0.58s var(--ease),
    transform 0.58s var(--ease);
}
.viewer.is-opening .viewer__slide.is-origin { z-index: 2; }
.viewer.is-opening .viewer__slide:not(.is-origin) { z-index: 1; }
.viewer__close {
  position: absolute; top: clamp(20px, 4vw, 40px); right: clamp(24px, 5vw, 56px);
  font-family: var(--font-display); font-weight: 500; font-size: 0.8rem; letter-spacing: 0.06em;
  color: var(--viewer-ink); padding: 3px 0;
  transition: color 0.3s;
}
.viewer__close::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: currentColor;
  transition: width 0.3s var(--ease);
}
.viewer__hint {
  margin-top: 20px;
  color: rgba(250,249,245,0.72); font-size: 0.72rem; letter-spacing: 0.06em;
}
.viewer__close:hover::after,
.viewer__close:focus-visible::after { width: 100%; }
.viewer__close:focus-visible {
  outline: 2px solid var(--viewer-ink);
  outline-offset: 4px;
  border-radius: 2px;
}
.viewer__nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 56px; height: 56px; border-radius: 50%;
  color: rgba(250,249,245,0.84); font-size: 2.4rem; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: color 0.3s, background 0.3s, transform 0.3s;
}
.viewer__nav:hover { color: var(--viewer-ink); background: rgba(250,249,245,0.1); }
.viewer__nav:active { transform: translateY(-50%) scale(0.96); }
.viewer__nav:disabled { opacity: 0.24; cursor: default; background: none; }
.viewer__nav--prev { left: clamp(16px, 4vw, 48px); }
.viewer__nav--next { right: clamp(16px, 4vw, 48px); }
.viewer__caption {
  position: absolute; left: clamp(24px, 5vw, 64px); bottom: clamp(24px, 5vw, 56px);
  max-width: 340px; color: var(--viewer-ink);
}
.viewer__cat { font-family: var(--font-display); font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent-pale); margin-bottom: 10px; }
.viewer__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.6rem, 3vw, 2.4rem); letter-spacing: -0.02em; line-height: 1; margin-bottom: 12px; }
.viewer__role { margin-bottom: 9px; font-size: 0.76rem; color: rgba(250,249,245,0.64); }
.viewer__desc { font-size: 0.86rem; line-height: 1.6; color: rgba(250,249,245,0.8); }
.viewer__count {
  position: absolute; right: clamp(24px, 5vw, 56px); bottom: clamp(24px, 5vw, 56px);
  font-family: var(--font-display); font-weight: 500; font-size: 0.9rem; letter-spacing: 0.1em;
  color: rgba(250,249,245,0.84); font-variant-numeric: tabular-nums;
}

@media (min-width: 921px) {
  .viewer {
    display: grid;
    grid-template-columns: minmax(270px, 30vw) minmax(0, 1fr);
    align-items: center;
    justify-content: initial;
    gap: clamp(80px, 7vw, 104px);
    padding: clamp(42px, 6vw, 84px) clamp(80px, 7vw, 96px);
  }
  .viewer__caption {
    position: static;
    align-self: center;
    max-width: 390px;
    max-height: 72dvh;
    overflow-y: auto;
    scrollbar-width: thin;
  }
  .viewer__cat { margin-bottom: 18px; }
  .viewer__title {
    margin-bottom: 24px;
    font-size: clamp(2.4rem, 4.8vw, 5rem);
    line-height: 0.92;
    letter-spacing: -0.055em;
  }
  .viewer__role {
    max-width: 32ch;
    margin-bottom: 22px;
    font-size: 0.78rem;
    line-height: 1.55;
  }
  .viewer__desc {
    max-width: 38ch;
    font-size: clamp(0.9rem, 1.05vw, 1rem);
    line-height: 1.7;
  }
  .viewer__gallery {
    position: relative;
    display: block;
    min-width: 0;
    height: min(76dvh, 760px);
  }
  .viewer.is-landscape-media .viewer__gallery {
    height: var(--landscape-slide-height, min(64dvh, 620px));
  }
  .viewer__viewport {
    width: 100%;
    height: 100%;
    overflow: hidden;
    border-radius: 0;
    box-shadow: none;
    position: relative;
    isolation: isolate;
  }
  /*
   * Infinitus 试点：依据 Progressive Blur Edge 的七层带状算法。
   * 只在右侧图片边缘叠加，图片在其下方移动，因此遮罩与边缘位置一致。
   */
  .viewer.has-edge-blur .viewer__progressive-blur {
    --blur-direction: to left;
    position: absolute;
    top: 50%;
    right: 0;
    /* 遮罩直接跟随固定画框，不再单独计算一套高度。 */
    height: 100%;
    width: clamp(140px, 10vw, 180px);
    transform: translateY(-50%);
    z-index: 3;
    display: block;
    overflow: hidden;
    pointer-events: none;
  }
  .viewer__progressive-blur-layer,
  .viewer__progressive-blur-tint {
    position: absolute;
    inset: 0;
    pointer-events: none;
  }
  .viewer__progressive-blur-layer {
    z-index: 0;
    /* 极低透明度的底色让 Chromium 始终建立 backdrop-filter 的绘制层，
       同时不改变右侧图片原本的明度。 */
    background: rgba(20, 20, 19, 0.001);
  }
  .viewer__progressive-blur-layer:nth-of-type(1) {
    backdrop-filter: blur(48px);
    -webkit-backdrop-filter: blur(48px);
    mask: linear-gradient(var(--blur-direction), #000 0%, #000 12.5%, transparent 25%);
    -webkit-mask: linear-gradient(var(--blur-direction), #000 0%, #000 12.5%, transparent 25%);
  }
  .viewer__progressive-blur-layer:nth-of-type(2) {
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    mask: linear-gradient(var(--blur-direction), transparent 0%, #000 12.5%, #000 25%, transparent 37.5%);
    -webkit-mask: linear-gradient(var(--blur-direction), transparent 0%, #000 12.5%, #000 25%, transparent 37.5%);
  }
  .viewer__progressive-blur-layer:nth-of-type(3) {
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    mask: linear-gradient(var(--blur-direction), transparent 12.5%, #000 25%, #000 37.5%, transparent 50%);
    -webkit-mask: linear-gradient(var(--blur-direction), transparent 12.5%, #000 25%, #000 37.5%, transparent 50%);
  }
  .viewer__progressive-blur-layer:nth-of-type(4) {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    mask: linear-gradient(var(--blur-direction), transparent 25%, #000 37.5%, #000 50%, transparent 62.5%);
    -webkit-mask: linear-gradient(var(--blur-direction), transparent 25%, #000 37.5%, #000 50%, transparent 62.5%);
  }
  .viewer__progressive-blur-layer:nth-of-type(5) {
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    mask: linear-gradient(var(--blur-direction), transparent 37.5%, #000 50%, #000 62.5%, transparent 75%);
    -webkit-mask: linear-gradient(var(--blur-direction), transparent 37.5%, #000 50%, #000 62.5%, transparent 75%);
  }
  .viewer__progressive-blur-layer:nth-of-type(6) {
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    mask: linear-gradient(var(--blur-direction), transparent 50%, #000 62.5%, #000 75%, transparent 87.5%);
    -webkit-mask: linear-gradient(var(--blur-direction), transparent 50%, #000 62.5%, #000 75%, transparent 87.5%);
  }
  .viewer__progressive-blur-layer:nth-of-type(7) {
    backdrop-filter: blur(1px);
    -webkit-backdrop-filter: blur(1px);
    mask: linear-gradient(var(--blur-direction), transparent 62.5%, #000 75%, #000 87.5%, transparent 100%);
    -webkit-mask: linear-gradient(var(--blur-direction), transparent 62.5%, #000 75%, #000 87.5%, transparent 100%);
  }
  .viewer__progressive-blur-tint {
    z-index: 1;
    /* 遮罩区域保持与邻图相近、略暗的明度，避免模糊带像一块发亮的玻璃。 */
    background: linear-gradient(var(--blur-direction), rgba(20, 20, 19, 0.62) 0%, rgba(20, 20, 19, 0.28) 55%, rgba(20, 20, 19, 0.04) 100%);
  }
  @media (prefers-reduced-transparency: reduce) {
    .viewer__progressive-blur-layer {
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
    }
  }
  .viewer__track {
    gap: clamp(18px, 2vw, 30px);
    transition-duration: 0.58s;
  }
  .viewer.has-edge-blur .viewer__track {
    align-items: center;
  }
  .viewer.has-edge-blur .viewer__gallery {
    --edge-frame-width: min(42vw, 520px, 59.4783dvh);
    /* 900:1150 是 Infinitus 的统一画框比例；高度从宽度派生，
       这样图片、viewport、渐进模糊遮罩永远共享同一条基线。 */
    --edge-frame-height: calc(var(--edge-frame-width) * 1.2777777778);
    height: var(--edge-frame-height);
  }
  .viewer.has-edge-blur .viewer__viewport {
    height: 100%;
  }
  .viewer__slide {
    flex-basis: min(42vw, 520px);
    width: min(42vw, 520px);
  }
  .viewer.has-edge-blur .viewer__slide {
    flex-basis: var(--edge-frame-width);
    width: var(--edge-frame-width);
    height: 100%;
    aspect-ratio: 900 / 1150;
  }
  .viewer.is-landscape-media .viewer__slide {
    flex-basis: var(--landscape-slide-width, min(88%, 880px));
    width: var(--landscape-slide-width, min(88%, 880px));
  }
  /*
   * New UB 固定高度方案：Hero 与全部横图共用同一条高度基线。
   * 图片不裁切，宽度由各自比例决定；首尾过渡自然表现为横向位移
   * 与 viewport 裁切，不再通过切换媒体类型改变画廊高度。
   */
  .viewer.has-mixed-loop .viewer__gallery {
    height: var(--mixed-height, min(76dvh, 760px));
  }
  .viewer.has-mixed-loop .viewer__slide {
    height: 100%;
    flex-basis: var(--mixed-landscape-width, min(88%, 880px));
    width: var(--mixed-landscape-width, min(88%, 880px));
  }
  .viewer.has-mixed-loop .viewer__slide[data-orientation="portrait"] {
    flex-basis: var(--mixed-hero-width, min(42vw, 520px));
    width: var(--mixed-hero-width, min(42vw, 520px));
  }
  .viewer__slide img {
    opacity: 0.62;
    filter: brightness(0.8) saturate(0.76);
    transform: scale(0.985);
  }
  .viewer__slide.is-active img {
    opacity: 1;
    filter: brightness(1) saturate(1);
    transform: scale(1);
  }
  .viewer__nav { z-index: 2; }
  .viewer__nav--prev { left: -80px; }
  .viewer__nav--next { right: -80px; }
  .viewer__count {
    right: 0;
    bottom: -32px;
  }
}

@media (min-width: 1200px) {
  .viewer {
    gap: clamp(96px, 7vw, 128px);
    padding-inline: clamp(104px, 8vw, 128px);
  }
  .viewer__nav--prev { left: -96px; }
  .viewer__nav--next { right: -96px; }
}

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

@media (max-width: 700px) {
  .viewer {
    align-items: flex-start;
    padding: 72px 18px 172px;
  }
  .viewer__viewport {
    width: var(--viewer-width, min(88vw, 430px));
    height: var(--viewer-height, min(56dvh, 520px));
  }
  .viewer__hint { display: none; }
  .viewer__nav {
    top: calc(72px + var(--viewer-height, min(56dvh, 520px)) + 24px);
    width: 44px;
    height: 44px;
    font-size: 2rem;
    transform: none;
  }
  .viewer__nav:active { transform: scale(0.96); }
  .viewer__nav--prev { left: 18px; }
  .viewer__nav--next { right: 18px; }
  .viewer__caption {
    left: 18px; right: 86px; bottom: 22px;
    max-width: none;
  }
  .viewer.is-landscape-media .viewer__caption {
    top: calc(72px + var(--viewer-height, min(56dvh, 520px)) + 88px);
    bottom: auto;
  }
  .viewer__cat { margin-bottom: 5px; }
  .viewer__title { margin-bottom: 6px; font-size: 1.55rem; }
  .viewer__role { margin-bottom: 5px; }
  .viewer__desc {
    display: -webkit-box; overflow: hidden;
    -webkit-line-clamp: 2; -webkit-box-orient: vertical;
    font-size: 0.78rem; line-height: 1.45;
  }
  .viewer__count { right: 18px; bottom: 22px; }
  .viewer.is-landscape-media .viewer__count {
    top: calc(72px + var(--viewer-height, min(56dvh, 520px)) + 38px);
    right: 80px;
    bottom: auto;
  }
}

@media (max-width: 460px) {
  .topnav { gap: 10px; }
  .topnav a, .topnav button { font-size: 0.74rem; }
  .stage { min-height: 460px; }
  .filmstrip { padding-inline: 42px; }
  .meta { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .meta__num { grid-column: 1; grid-row: 1; }
  .meta__top { grid-column: 1; grid-row: 2; width: 100%; }
  .meta__facts { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
  .bottombar { grid-template-columns: minmax(0, 1fr) auto; gap: 12px; }
  .copy { font-size: 0.75rem; letter-spacing: 0.02em; }
  .socials { gap: 6px; }
  .social-icon { width: 23px; height: 23px; }
  .social-icon--xiaohongshu { width: 20.7px; height: 20.7px; }
  .social-icon--douyin { width: 24.5px; height: 24.5px; }
}