/* ============================================================
   DESIGN SYSTEM —— 黑 · 白 · 银灰 + AI 科技感渐变光
   ============================================================ */
:root {
  --bg: #050506;
  --bg-soft: #0c0c0f;
  --card: #121216;
  --card-2: #17171c;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #f5f5f7;
  --muted: #9b9ba3;
  --dim: #6e6e76;
  --accent-a: #6ee7ff;
  --accent-b: #7d7aff;
  --accent-c: #c084fc;
  --grad: linear-gradient(100deg, var(--accent-a), var(--accent-b) 48%, var(--accent-c));
  --radius: 20px;
  --radius-s: 12px;
  --nav-h: 72px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: opacity 0.28s ease;
}
body.leaving { opacity: 0; }
body.entering { opacity: 0; }

a { color: inherit; text-decoration: none; }
img, video { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }

::selection { background: rgba(125, 122, 255, 0.35); }

/* ---------- 布局 ---------- */
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 32px; }
section { padding: 110px 0; position: relative; }

/* 顶部导航 */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  transition: background 0.4s ease, border-color 0.4s ease, backdrop-filter 0.4s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(5, 5, 6, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: var(--line);
}
.nav .wrap { width: 100%; max-width: none; display: flex; align-items: center; justify-content: flex-end; padding: 0 clamp(28px, 3.2vw, 60px); }
.nav-links { display: flex; gap: 48px; align-items: center; }
.nav-links a {
  font-size: 18px; color: var(--muted); letter-spacing: 0.04em;
  transition: color 0.25s ease; position: relative; padding: 4px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -4px; width: 0; height: 2px;
  background: var(--grad); transition: width 0.3s var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-toggle { display: none; background: none; border: 0; width: 40px; height: 40px; position: relative; }
.nav-toggle i {
  display: block; width: 20px; height: 1.5px; background: var(--text);
  margin: 5px auto; transition: transform 0.3s var(--ease), opacity 0.3s ease;
}
.nav.open .nav-toggle i:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav.open .nav-toggle i:nth-child(2) { opacity: 0; }
.nav.open .nav-toggle i:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* 页面标题区 */
.page-head { padding: calc(var(--nav-h) + 96px) 0 40px; }
.eyebrow {
  font-size: 12px; letter-spacing: 0.42em; text-transform: uppercase;
  color: var(--dim); display: flex; align-items: center; gap: 14px; margin-bottom: 22px;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--grad); }
h1.display {
  font-size: clamp(2.6rem, 6.4vw, 4.6rem);
  line-height: 1.12; font-weight: 700; letter-spacing: -0.025em;
}
h1.display em, .grad-text {
  font-style: normal;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { color: var(--muted); font-size: 17px; max-width: 620px; margin-top: 22px; }

/* section 标题 */
.sec-head { margin-bottom: 56px; }
.sec-head h2 {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem); font-weight: 700; letter-spacing: -0.02em;
}
.sec-head .sub { color: var(--dim); margin-top: 12px; font-size: 15px; }

/* ---------- 作品卡片 ---------- */
.grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px;
}
.grid .card.span2 { grid-column: span 2; }

.card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: var(--card); border: 1px solid var(--line);
  cursor: pointer; display: block;
  transition: transform 0.5s var(--ease), border-color 0.4s ease, box-shadow 0.5s ease;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(125, 122, 255, 0.08);
}
.card-media { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: #0a0a0d; }
.card-media img, .card-media video {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.9s var(--ease), filter 0.6s ease;
  transform: scale(1.001);
}
.card:hover .card-media img, .card:hover .card-media video { transform: scale(1.055); filter: brightness(1.06); }
.card-media .ratio-film { aspect-ratio: 21 / 9; }
.card-badge {
  position: absolute; top: 18px; left: 18px; z-index: 2;
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  padding: 7px 14px; border-radius: 100px;
  background: rgba(8, 8, 10, 0.55); border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  color: rgba(255, 255, 255, 0.88);
}
.card-info {
  position: absolute; inset: 0; z-index: 2;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 26px;
  background: linear-gradient(to top, rgba(4, 4, 6, 0.88) 0%, rgba(4, 4, 6, 0.35) 38%, transparent 62%);
  opacity: 0; transform: translateY(14px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}
.card:hover .card-info, .card:focus-visible .card-info { opacity: 1; transform: translateY(0); }
.card-info .cat { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--accent-a); margin-bottom: 8px; }
.card-info h3 { font-size: 21px; font-weight: 650; letter-spacing: -0.01em; }
.card-info p { font-size: 13.5px; color: rgba(255, 255, 255, 0.72); margin-top: 6px; max-width: 480px; }
.card-info .go {
  margin-top: 14px; font-size: 12.5px; letter-spacing: 0.14em; color: rgba(255,255,255,0.85);
  display: inline-flex; align-items: center; gap: 8px;
}
.card-info .go::after { content: "→"; transition: transform 0.3s var(--ease); }
.card:hover .card-info .go::after { transform: translateX(6px); }

/* 移动端卡片信息常显（无 hover） */
@media (hover: none) {
  .card-info { opacity: 1; transform: none; }
}

/* ---------- 首页 HERO ---------- */
.hero {
  min-height: 100vh; min-height: 100svh;
  display: flex; align-items: flex-end;
  padding: 0 0 96px; position: relative; overflow: hidden;
  margin-top: calc(var(--nav-h) * -1);
  padding-top: var(--nav-h);
}
.hero-bg { position: absolute; inset: -4% 0 0; overflow: hidden; }
.hero-bg img {
  width: 100%; height: 100%; object-fit: cover;
  animation: kenburns 26s var(--ease) both;
  filter: saturate(1.05);
}
.hero-bg video {
  width: 100%; height: 100%; object-fit: cover;
  filter: saturate(1.05);
}
@keyframes kenburns {
  from { transform: scale(1.12) translateY(-1.5%); }
  to { transform: scale(1) translateY(0); }
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(120% 90% at 78% 12%, rgba(125, 122, 255, 0.14), transparent 55%),
    linear-gradient(to top, var(--bg) 2%, rgba(5, 5, 6, 0.55) 30%, rgba(5, 5, 6, 0.22) 58%, rgba(5, 5, 6, 0.32) 100%);
}
.hero-glow {
  position: absolute; width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, rgba(125, 122, 255, 0.16), transparent 65%);
  filter: blur(20px); pointer-events: none;
  top: 8%; right: -6%;
  animation: floaty 12s ease-in-out infinite alternate;
}
@keyframes floaty { from { transform: translate(0, 0); } to { transform: translate(-60px, 40px); } }
/* 宽度撑满内容容器，让 hero 块与其它版块的左基线对齐（而非自适应收缩居中） */
.hero-content { position: relative; z-index: 2; width: 100%; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12.5px; letter-spacing: 0.34em; text-transform: uppercase; color: var(--muted);
  padding: 9px 18px; border: 1px solid var(--line-strong); border-radius: 100px;
  background: rgba(10, 10, 12, 0.45); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  margin-bottom: 30px;
}
.hero-tag i { width: 7px; height: 7px; border-radius: 50%; background: var(--grad); box-shadow: 0 0 12px rgba(125, 122, 255, 0.9); }
.hero h1 {
  font-size: clamp(2.9rem, 6.5vw, 5.8rem);
  line-height: 1.08; font-weight: 750; letter-spacing: -0.03em; max-width: 1080px;
  text-shadow: 0 6px 44px rgba(0, 0, 0, 0.6);
}
.hero .hero-sub {
  margin-top: 24px; color: var(--muted); font-size: 17.5px; max-width: 620px; font-weight: 300;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.65);
}
.hero-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.hero-chips span {
  font-size: 13px; color: var(--muted); letter-spacing: 0.08em;
  padding: 9px 18px; border: 1px solid var(--line); border-radius: 100px;
  background: rgba(14, 14, 18, 0.5); backdrop-filter: blur(8px);
  transition: color 0.3s ease, border-color 0.3s ease;
}
.hero-chips span:hover { color: var(--text); border-color: var(--line-strong); }
.hero-cta { display: flex; gap: 14px; margin-top: 44px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 32px; border-radius: 100px; font-size: 14.5px; font-weight: 500;
  letter-spacing: 0.02em; border: 1px solid transparent;
  transition: transform 0.35s var(--ease), box-shadow 0.35s ease, background 0.3s ease, border-color 0.3s ease;
}
.btn-primary {
  background: var(--text); color: #0a0a0c;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -12px rgba(245, 245, 247, 0.35); }
.btn-ghost { border-color: var(--line-strong); color: var(--text); background: rgba(12, 12, 15, 0.4); backdrop-filter: blur(8px); }
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.4); transform: translateY(-2px); }
.btn .arrow { transition: transform 0.3s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

.hero-scroll {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  font-size: 10.5px; letter-spacing: 0.4em; text-transform: uppercase; color: var(--dim);
  display: flex; flex-direction: column; align-items: center; gap: 12px; z-index: 2;
}
.hero-scroll::after {
  content: ""; width: 1px; height: 44px;
  background: linear-gradient(to bottom, var(--accent-b), transparent);
  animation: drip 2.2s ease-in-out infinite;
}
@keyframes drip { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 100% { transform: scaleY(1); opacity: 0; transform-origin: bottom; } }

/* 大图条（首页精选 / 分隔） */
.filmstrip {
  border-radius: var(--radius); overflow: hidden; position: relative;
  border: 1px solid var(--line);
}
.filmstrip img { width: 100%; aspect-ratio: 21 / 9; object-fit: cover; }
.filmstrip .cap {
  position: absolute; left: 28px; bottom: 24px;
  font-size: 11.5px; letter-spacing: 0.3em; text-transform: uppercase; color: rgba(255,255,255,0.75);
}

/* 数字/能力区 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat {
  padding: 30px 26px; border-radius: var(--radius-s);
  background: linear-gradient(180deg, var(--card-2), var(--card));
  border: 1px solid var(--line);
}
.stat b { display: block; font-size: 30px; font-weight: 700; letter-spacing: -0.02em; }
.stat b i {
  font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat span { display: block; margin-top: 6px; font-size: 13px; color: var(--dim); letter-spacing: 0.06em; }

/* 分类入口 */
.cats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cat-card {
  padding: 34px 28px; border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card-2), var(--card));
  border: 1px solid var(--line); position: relative; overflow: hidden;
  transition: transform 0.5s var(--ease), border-color 0.4s ease;
  display: block;
}
.cat-card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(140% 100% at 50% 120%, rgba(125, 122, 255, 0.14), transparent 60%);
  opacity: 0; transition: opacity 0.5s ease;
}
.cat-card:hover { transform: translateY(-5px); border-color: var(--line-strong); }
.cat-card:hover::before { opacity: 1; }
.cat-card .num { font-size: 12px; letter-spacing: 0.2em; color: var(--dim); }
.cat-card h3 { font-size: 20px; font-weight: 650; margin: 44px 0 6px; }
.cat-card p { font-size: 13px; color: var(--dim); }
.cat-card .count { position: absolute; top: 30px; right: 28px; font-size: 22px; font-weight: 200; color: var(--dim); }

/* CTA 大区 */
.cta-band {
  text-align: center; padding: 130px 0 140px; position: relative; overflow: hidden;
  border-top: 1px solid var(--line);
}
.cta-band::before {
  content: ""; position: absolute; left: 50%; bottom: -380px; transform: translateX(-50%);
  width: 900px; height: 520px; border-radius: 50%;
  background: radial-gradient(circle, rgba(125, 122, 255, 0.2), rgba(110, 231, 255, 0.07) 45%, transparent 70%);
  filter: blur(30px);
}
.cta-band h2 { font-size: clamp(2rem, 4.6vw, 3.2rem); font-weight: 700; letter-spacing: -0.025em; }
.cta-band p { color: var(--muted); margin: 18px auto 40px; max-width: 480px; }

/* 页脚 */
footer {
  border-top: 1px solid var(--line); padding: 64px 0 46px;
  background: var(--bg-soft);
}
.foot-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.foot-brand { font-size: 20px; font-weight: 700; letter-spacing: 0.04em; }
.foot-brand small { display: block; font-size: 12.5px; color: var(--dim); font-weight: 400; margin-top: 8px; letter-spacing: 0.08em; }
.foot-links { display: flex; gap: 60px; flex-wrap: wrap; }
.foot-col h4 { font-size: 12px; letter-spacing: 0.26em; text-transform: uppercase; color: var(--dim); margin-bottom: 16px; font-weight: 500; }
.foot-col a { display: block; font-size: 14px; color: var(--muted); margin-bottom: 10px; transition: color 0.25s ease; }
.foot-col a:hover { color: var(--text); }
.foot-base {
  margin-top: 54px; padding-top: 24px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--dim); letter-spacing: 0.05em;
}

/* ---------- Work 列表页 ---------- */
.filter {
  display: flex; gap: 10px; flex-wrap: wrap; margin: 8px 0 46px;
}
.filter button {
  padding: 10px 22px; border-radius: 100px; font-size: 13.5px;
  background: transparent; color: var(--muted); border: 1px solid var(--line);
  transition: all 0.3s ease; letter-spacing: 0.04em;
}
.filter button:hover { color: var(--text); border-color: var(--line-strong); }
.filter button.active {
  color: #0a0a0c; background: var(--text); border-color: var(--text); font-weight: 600;
}
.grid.fade-swap .card { animation: cardIn 0.55s var(--ease) both; }
@keyframes cardIn { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }

/* ---------- 项目详情 ---------- */
.proj-hero { padding: calc(var(--nav-h) + 90px) 0 0; }
.proj-hero .meta { display: flex; flex-wrap: wrap; gap: 48px; margin-top: 46px; padding-top: 30px; border-top: 1px solid var(--line); }
.proj-hero .meta div h5 { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--dim); margin-bottom: 8px; font-weight: 500; }
.proj-hero .meta div p { font-size: 15px; color: var(--text); }
.proj-cover {
  margin-top: 60px; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); position: relative; background: var(--card);
}
.proj-cover img { width: 100%; aspect-ratio: 21 / 9; object-fit: cover; }
.proj-body { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 70px; padding: 80px 0 10px; align-items: start; }
.proj-body .intro h2 { font-size: 24px; font-weight: 650; margin-bottom: 18px; letter-spacing: -0.01em; }
.proj-body .intro p { color: var(--muted); font-size: 16.5px; }
.hl-list { display: flex; flex-direction: column; }
.hl-item {
  display: flex; gap: 20px; padding: 22px 4px; border-bottom: 1px solid var(--line); align-items: baseline;
}
.hl-item:first-child { border-top: 1px solid var(--line); }
.hl-item .idx {
  font-size: 12px; letter-spacing: 0.1em; color: var(--accent-b); min-width: 30px;
  font-variant-numeric: tabular-nums;
}
.hl-item p { font-size: 15.5px; }
.gallery { display: flex; flex-direction: column; gap: 26px; padding: 30px 0 0; }
.gallery-item {
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line);
  background: var(--card);
}
.gallery-item img, .gallery-item video { width: 100%; display: block; }
.gallery-item figcaption {
  padding: 14px 22px; font-size: 12.5px; letter-spacing: 0.12em; color: var(--dim);
  border-top: 1px solid var(--line); text-transform: uppercase;
}
.proj-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 90px 0 0; }
.proj-nav a {
  padding: 34px 30px; border: 1px solid var(--line); border-radius: var(--radius);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.4s var(--ease);
  background: var(--card); position: relative;
}
.proj-nav a:hover { border-color: var(--line-strong); background: var(--card-2); transform: translateY(-4px); }
.proj-nav a small { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--dim); display: block; margin-bottom: 10px; }
.proj-nav a .t { font-size: 18px; font-weight: 600; }
.proj-nav a.next { text-align: right; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 80px; align-items: start; }
.avatar-ph {
  aspect-ratio: 4 / 5; border-radius: var(--radius);
  border: 1px dashed rgba(255, 255, 255, 0.22);
  background: linear-gradient(160deg, var(--card-2), var(--card));
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  color: var(--dim); font-size: 13px; letter-spacing: 0.2em;
}
.avatar-ph svg { opacity: 0.4; }
.avatar-img {
  width: 100%; aspect-ratio: 4 / 5; object-fit: cover; object-position: center;
  border-radius: var(--radius); border: 1px solid var(--line);
  display: block;
}
.about-text h2 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 26px; }
.about-text p { color: var(--muted); margin-bottom: 18px; font-size: 16px; }
.about-text .ph-note {
  color: var(--dim); font-size: 13.5px; border-left: 2px solid var(--accent-b);
  padding-left: 14px; margin: 24px 0 0; line-height: 1.8;
}
.skills { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 70px; }
.skill {
  padding: 30px 28px; border-radius: var(--radius); border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--card-2), var(--card));
  transition: transform 0.45s var(--ease), border-color 0.35s ease;
}
.skill:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.skill .ico { font-size: 20px; margin-bottom: 16px; display: block; }
.skill h3 { font-size: 17px; font-weight: 650; margin-bottom: 8px; }
.skill p { font-size: 13.5px; color: var(--dim); }
.services { margin-top: 90px; }
.service-row {
  display: grid; grid-template-columns: 60px 1fr 1.4fr; gap: 30px; align-items: baseline;
  padding: 34px 6px; border-bottom: 1px solid var(--line);
}
.service-row:first-of-type { border-top: 1px solid var(--line); }
.service-row .n { font-size: 13px; color: var(--accent-b); letter-spacing: 0.1em; }
.service-row h3 { font-size: 21px; font-weight: 650; letter-spacing: -0.01em; }
.service-row p { font-size: 14.5px; color: var(--dim); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 80px; align-items: start; }
.contact-item {
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  padding: 34px 6px; border-bottom: 1px solid var(--line);
}
.contact-item:first-of-type { border-top: 1px solid var(--line); }
.contact-item .lab { font-size: 11.5px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--dim); margin-bottom: 8px; }
.contact-item .val { font-size: 20px; font-weight: 550; letter-spacing: 0.01em; word-break: break-all; }
.copy-btn {
  padding: 10px 20px; border-radius: 100px; border: 1px solid var(--line-strong);
  background: transparent; color: var(--muted); font-size: 12.5px; letter-spacing: 0.1em;
  transition: all 0.3s ease; white-space: nowrap;
}
.copy-btn:hover { color: var(--text); border-color: rgba(255, 255, 255, 0.4); }
.copy-btn.done { color: var(--accent-a); border-color: rgba(110, 231, 255, 0.4); }
.qr-box {
  border-radius: var(--radius); border: 1px dashed rgba(255, 255, 255, 0.22);
  aspect-ratio: 1; max-width: 380px;
  background: linear-gradient(160deg, var(--card-2), var(--card));
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  color: var(--dim); font-size: 13px; letter-spacing: 0.18em; text-align: center; padding: 30px;
}
.qr-box img { width: 72%; border-radius: 12px; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; } .reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; } .reveal.d4 { transition-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .wrap { padding: 0 22px; }
  section { padding: 76px 0; }
  .grid { grid-template-columns: 1fr; gap: 20px; }
  .grid .card.span2 { grid-column: span 1; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .cats { grid-template-columns: repeat(2, 1fr); }
  .proj-body, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 46px; }
  .skills { grid-template-columns: 1fr; }
  .service-row { grid-template-columns: 44px 1fr; }
  .service-row p { grid-column: 2; }
  .proj-cover img { aspect-ratio: 16 / 9; }
  .proj-nav { grid-template-columns: 1fr; }
  .foot-links { gap: 36px; }
}
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .hero-scroll { display: none; }
  .nav-links {
    position: fixed; inset: var(--nav-h) 0 auto 0;
    flex-direction: column; gap: 4px; padding: 18px 22px 26px;
    background: rgba(6, 6, 8, 0.92); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s var(--ease);
  }
  .nav.open .nav-links { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { font-size: 16px; padding: 12px 0; }
  .hero { padding-bottom: 80px; }
  .hero h1 { font-size: clamp(2.2rem, 9.5vw, 3rem); }
  .hero-chips { gap: 8px; }
  .card-info { padding: 20px; }
  .contact-item .val { font-size: 16px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 14px; }
  .stat b { font-size: 24px; }
  .cats { grid-template-columns: 1fr; }
  .proj-hero .meta { gap: 26px; }
  .contact-item { flex-direction: column; align-items: flex-start; gap: 14px; }
}

/* ============================================================
   首页 · 项目编辑式排版（按项目名称主导，错落非规则）
   ============================================================ */
.pb { padding: 96px 0; position: relative; }
.pb + .pb { border-top: 1px solid var(--line); }

.pb-head {
  display: flex; align-items: flex-end; justify-content: space-between; gap: 40px;
  padding-bottom: 26px; border-bottom: 1px solid var(--line); margin-bottom: 48px;
}
.pb-num { font-size: 12px; letter-spacing: 0.32em; color: var(--dim); padding-bottom: 12px; font-variant-numeric: tabular-nums; }
.pb-title h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); font-weight: 700; letter-spacing: -0.022em; }
.pb-title h2 a { transition: color 0.3s ease; }
.pb-title h2 a:hover { color: var(--accent-a); }
.pb-meta { font-size: 12px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--dim); margin-top: 10px; }
.pb-more { font-size: 13px; color: var(--muted); white-space: nowrap; padding-bottom: 10px; letter-spacing: 0.04em; }
.pb-more .arrow { display: inline-block; transition: transform 0.3s var(--ease); }
.pb-more:hover { color: var(--text); }
.pb-more:hover .arrow { transform: translateX(5px); }
.pb-summary { margin-top: 36px; color: var(--muted); font-size: 15.5px; max-width: 520px; }

/* 12 列错落网格 */
.pb-media {
  display: grid; grid-template-columns: repeat(12, 1fr); gap: 22px; align-items: start;
}

/* 版式 A —— 顶部大视频 + 右侧全高竖幅 + 底部双格对齐（完整矩形，无内空洞） */
.layout-a .pb-media figure:nth-child(1) { grid-column: 1 / 9;  grid-row: 1; aspect-ratio: 16 / 9; }
.layout-a .pb-media figure:nth-child(2) {
  grid-column: 9 / 13; grid-row: 1 / 3;
  align-self: stretch; height: 100%; aspect-ratio: auto;
}
.layout-a .pb-media figure:nth-child(3) { grid-column: 1 / 5;  grid-row: 2; aspect-ratio: 5 / 4; }
.layout-a .pb-media figure:nth-child(4) { grid-column: 5 / 9;  grid-row: 2; aspect-ratio: 5 / 4; }

/* 版式 B —— 右上大图 + 底部三联（左下竖构图） */
.layout-b .pb-media figure:nth-child(1) { grid-column: 4 / 13; grid-row: 1; aspect-ratio: 16 / 9; }
.layout-b .pb-media figure:nth-child(2) { grid-column: 1 / 5;  grid-row: 2; aspect-ratio: 3 / 4; }
.layout-b .pb-media figure:nth-child(3) { grid-column: 5 / 10; grid-row: 2; aspect-ratio: 4 / 3; margin-top: 30px; }
.layout-b .pb-media figure:nth-child(4) { grid-column: 10 / 13; grid-row: 2; aspect-ratio: 4 / 3; }

/* 版式 G —— 2×2 整齐网格 */
.layout-g .pb-media figure:nth-child(1) { grid-column: 1 / 7;  grid-row: 1; aspect-ratio: 16 / 9; }
.layout-g .pb-media figure:nth-child(2) { grid-column: 7 / 13; grid-row: 1; aspect-ratio: 16 / 9; }
.layout-g .pb-media figure:nth-child(3) { grid-column: 1 / 7;  grid-row: 2; aspect-ratio: 16 / 9; }
.layout-g .pb-media figure:nth-child(4) { grid-column: 7 / 13; grid-row: 2; aspect-ratio: 16 / 9; }

/* 版式 H —— 左列上下双格 + 右侧全高竖幅 */
.layout-h .pb-media figure:nth-child(1) { grid-column: 1 / 9;  grid-row: 1; aspect-ratio: 16 / 9; }
.layout-h .pb-media figure:nth-child(2) { grid-column: 1 / 9;  grid-row: 2; aspect-ratio: 21 / 9; }
.layout-h .pb-media figure:nth-child(3) {
  grid-column: 9 / 13; grid-row: 1 / 3;
  align-self: stretch; height: 100%; aspect-ratio: auto;
}

/* 版式 I —— 斜切双屏（黄昏 / 夜晚对撞）+ 底部对分 */
.layout-i .pb-media { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0; row-gap: 30px; }
.layout-i .pb-media figure:nth-child(1) {
  width: 58%; aspect-ratio: 3 / 2;
  clip-path: polygon(0 0, 100% 0, 75% 100%, 0 100%);
}
.layout-i .pb-media figure:nth-child(2) {
  width: 55%; margin-left: -13%;
  align-self: stretch; height: auto; aspect-ratio: auto;
  clip-path: polygon(26.5% 0, 100% 0, 100% 100%, 0 100%);
}
.layout-i .pb-media figure:nth-child(3) { width: 48%; aspect-ratio: 4 / 3; }
.layout-i .pb-media figure:nth-child(4) { width: 48%; aspect-ratio: 4 / 3; }

/* 版式 J —— 全宽超宽主视觉 + 层叠对比卡 + 轨道宽幅 */
.layout-j .pb-media figure:nth-child(1) { grid-column: 1 / 13; grid-row: 1; aspect-ratio: 5 / 2; }
.layout-j .pb-media figure:nth-child(2) { grid-column: 1 / 5;  grid-row: 2; aspect-ratio: 1 / 1; }
.layout-j .pb-media figure:nth-child(3) {
  grid-column: 5 / 13; grid-row: 2;
  align-self: stretch; height: 100%; aspect-ratio: auto;
}

/* 层叠对比卡：上层成品图，悬停向左滑开露出下层布线 */
figure.media.media-stack { aspect-ratio: 1 / 1; }
figure.media.media-stack > a { position: relative; display: block; height: 100%; }
figure.media.media-stack .stack-layers { position: absolute; inset: 0; display: block; overflow: hidden; }
figure.media.media-stack .stack-layers img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block;
}
figure.media.media-stack .stack-top { transition: transform 0.75s var(--ease); }
figure.media.media-stack:hover .stack-top,
figure.media.media-stack.revealed .stack-top { transform: translateX(-103%); }

/* 消散变体：上层过程稿悬停时模糊消散，露出下层主 KV；移开后重组恢复 */
figure.media.stack-dissolve .stack-top {
  transition: opacity 0.9s var(--ease), filter 0.9s var(--ease), transform 0.9s var(--ease);
}
figure.media.stack-dissolve:hover .stack-top,
figure.media.stack-dissolve.revealed .stack-top {
  opacity: 0;
  filter: blur(18px) brightness(1.4) saturate(0.55);
  transform: scale(1.07);
}
/* 灰烬模式（JS canvas 接管）：禁用 CSS 溶解，由 canvas 逐块烧散 */
figure.media.stack-dissolve .ash-canvas {
  position: absolute; inset: 0; pointer-events: none; opacity: 0;
}
figure.media.stack-dissolve.ash-js:hover .stack-top,
figure.media.stack-dissolve.ash-js.revealed .stack-top {
  opacity: 1; filter: none; transform: none;
}

/* 版式 K —— 左侧全高竖幅 + 右上宽幅主视觉 + 底部双格 */
.layout-k .pb-media figure:nth-child(1) {
  grid-column: 1 / 5; grid-row: 1 / 3;
  align-self: stretch; height: 100%; aspect-ratio: auto;
}
.layout-k .pb-media figure:nth-child(2) { grid-column: 5 / 13; grid-row: 1; aspect-ratio: 2 / 1; }
.layout-k .pb-media figure:nth-child(3) { grid-column: 5 / 9;  grid-row: 2; aspect-ratio: 1 / 1; }
.layout-k .pb-media figure:nth-child(4) { grid-column: 9 / 13; grid-row: 2; aspect-ratio: 1 / 1; }

/* 版式 L —— 左右等分分屏 */
.layout-l .pb-media figure:nth-child(1) { grid-column: 1 / 7;  grid-row: 1; aspect-ratio: 4 / 5; }
.layout-l .pb-media figure:nth-child(2) { grid-column: 7 / 13; grid-row: 1; aspect-ratio: 4 / 5; }

/* 版式 C —— 上行双格顶底对齐 + 下行三等分 */
.layout-c .pb-media figure:nth-child(1) {
  grid-column: 1 / 5; grid-row: 1;
  align-self: stretch; height: 100%; aspect-ratio: auto;
}
.layout-c .pb-media figure:nth-child(2) { grid-column: 5 / 13; grid-row: 1; aspect-ratio: 16 / 9; }
.layout-c .pb-media figure:nth-child(3) { grid-column: 1 / 5;  grid-row: 2; aspect-ratio: 16 / 10; }
.layout-c .pb-media figure:nth-child(4) { grid-column: 5 / 9;  grid-row: 2; aspect-ratio: 16 / 10; }
.layout-c .pb-media figure:nth-child(5) { grid-column: 9 / 13; grid-row: 2; aspect-ratio: 16 / 10; }

/* 版式 D —— 全宽主视觉 + 双小幅错落 */
.layout-d .pb-media figure:nth-child(1) { grid-column: 1 / 13; grid-row: 1; aspect-ratio: 16 / 9; }
.layout-d .pb-media figure:nth-child(2) { grid-column: 1 / 6;  grid-row: 2; aspect-ratio: 4 / 3; margin-top: 28px; }
.layout-d .pb-media figure:nth-child(3) { grid-column: 8 / 13; grid-row: 2; aspect-ratio: 4 / 3; margin-top: 80px; }

/* 版式 E —— 左中幅 + 右侧竖图 + 下沉宽幅 */
.layout-e .pb-media figure:nth-child(1) { grid-column: 1 / 7;  grid-row: 1; aspect-ratio: 3 / 2; }
.layout-e .pb-media figure:nth-child(2) { grid-column: 7 / 13; grid-row: 1; aspect-ratio: 4 / 5; margin-top: 58px; }
.layout-e .pb-media figure:nth-child(3) { grid-column: 1 / 7;  grid-row: 2; aspect-ratio: 16 / 9; margin-top: 26px; }

/* 双媒体项目：紧凑双联 */
.pb .pb-media.is-pair figure.media:nth-child(1) { grid-column: 1 / 9; grid-row: 1; aspect-ratio: 16 / 9; }
.pb .pb-media.is-pair figure.media:nth-child(2) { grid-column: 9 / 13; grid-row: 1; aspect-ratio: 3 / 4; margin-top: 52px; }

/* 单媒体项目：全宽 */
.pb .pb-media figure.media:only-child { grid-column: 1 / 13; grid-row: 1; aspect-ratio: 16 / 9; }

/* 媒体块 */
figure.media {
  position: relative; margin: 0; overflow: hidden;
  border-radius: 16px; border: 1px solid var(--line); background: var(--card);
  transition: transform 0.6s var(--ease), border-color 0.4s ease, box-shadow 0.6s ease;
}
figure.media > a { display: block; height: 100%; }
figure.media img, figure.media video {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform 1s var(--ease), filter 0.5s ease;
}
figure.media:hover { border-color: var(--line-strong); box-shadow: 0 26px 70px -24px rgba(0, 0, 0, 0.85); }
figure.media:hover img, figure.media:hover video { transform: scale(1.045); }
figure.media figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 26px 18px 14px; font-size: 11.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: rgba(255, 255, 255, 0.82);
  background: linear-gradient(to top, rgba(4, 4, 6, 0.78), transparent);
  pointer-events: none;
}
.m-tag {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  font-size: 10.5px; letter-spacing: 0.22em; padding: 6px 13px; border-radius: 100px;
  background: rgba(8, 8, 10, 0.6); border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  color: rgba(255, 255, 255, 0.8);
  pointer-events: none;   /* 纯标签：点击穿透到下面的图，走放大逻辑 */
}
/* 过程稿：视觉降一级，悬停恢复 */
.tier-process img, .tier-process video { filter: saturate(0.55) brightness(0.8); }
.tier-process:hover img, .tier-process:hover video { filter: none; }
/* 切片 / 静态帧：略降对比，与成品区分 */
.tier-sub img, .tier-sub video { filter: brightness(0.94); }
.tier-sub:hover img, .tier-sub:hover video { filter: none; }

/* ============================================================
   视频播放器：播放 / 暂停 + 音量 + 小猫进度条
   ============================================================ */
.vbar {
  position: absolute; left: 12px; right: 12px; bottom: 12px; z-index: 4;
  display: flex; align-items: center; gap: 12px;
  padding: 7px 12px; border-radius: 100px;
  background: rgba(8, 8, 11, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(14px) saturate(140%); -webkit-backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 12px 34px -14px rgba(0, 0, 0, 0.75);
  opacity: 0.94; transition: opacity 0.3s ease, background 0.3s ease;
}
figure.media:hover .vbar, .vbar:focus-within { opacity: 1; background: rgba(8, 8, 11, 0.8); }
.vbtn {
  flex: 0 0 auto; width: 30px; height: 30px; border-radius: 50%; border: 0;
  display: grid; place-items: center; cursor: pointer; color: #fff;
  background: rgba(255, 255, 255, 0.09);
  transition: background 0.25s ease, transform 0.25s var(--ease);
}
.vbtn:hover { background: rgba(255, 255, 255, 0.2); transform: translateY(-1px); }
.vbtn svg { width: 15px; height: 15px; display: block; }
.vbar.is-playing .ic-play { display: none; }
.vbar:not(.is-playing) .ic-pause { display: none; }
.vbar.is-muted .ic-on { display: none; }
.vbar:not(.is-muted) .ic-off { display: none; }
.vbar.is-fullscreen .ic-fs { display: none; }
.vbar:not(.is-fullscreen) .ic-unfs { display: none; }
.vfull { margin-left: 2px; }

.vtrack {
  position: relative; flex: 1 1 auto; min-width: 60px; height: 4px;
  border-radius: 100px; background: rgba(255, 255, 255, 0.2); cursor: pointer;
}
/* 豆点层：一排固定位置的"豆子"；--eaten（已播放百分比）左侧的豆子被吃掉 */
.vdots {
  position: absolute; left: 0; right: 0; top: 50%; height: 4px; transform: translateY(-50%);
  background-image: radial-gradient(circle, #ffe9b8 1.7px, rgba(255, 233, 184, 0.25) 2.2px, transparent 2.8px);
  background-size: 14px 4px; background-position: 7px 50%; background-repeat: repeat-x;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, transparent var(--eaten, 0%), #000 calc(var(--eaten, 0%) + 2px));
  mask-image: linear-gradient(90deg, transparent 0, transparent var(--eaten, 0%), #000 calc(var(--eaten, 0%) + 2px));
}
/* 吃豆人：黄色圆 + 右侧楔形嘴，播放时 steps 硬切张合，暂停时定格张嘴 */
.pac {
  position: absolute; left: 0; top: 50%; transform: translate(-50%, -50%);
  width: 16px; height: 16px; pointer-events: none;
  border-radius: 50%; background: #ffd24a;
  clip-path: polygon(100% 78%, 50% 50%, 100% 22%, 100% 0, 0 0, 0 100%, 100% 100%);
  animation: chomp 0.26s steps(1, end) infinite;
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.65));
}
@keyframes chomp {
  0%   { clip-path: polygon(100% 78%, 50% 50%, 100% 22%, 100% 0, 0 0, 0 100%, 100% 100%); }
  50%  { clip-path: polygon(100% 56%, 50% 50%, 100% 44%, 100% 0, 0 0, 0 100%, 100% 100%); }
  100% { clip-path: polygon(100% 78%, 50% 50%, 100% 22%, 100% 0, 0 0, 0 100%, 100% 100%); }
}
.pac.paused { animation: none; clip-path: polygon(100% 78%, 50% 50%, 100% 22%, 100% 0, 0 0, 0 100%, 100% 100%); }
/* 轨道末端樱桃：轻晃吸引注意；播到末尾被吃豆人吃掉（缩小消失） */
.vcherry {
  position: absolute; right: -7px; top: 50%; transform: translateY(-50%) scale(1);
  width: 15px; height: 15px; pointer-events: none;
  animation: cherryBob 1.8s ease-in-out infinite;
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.6));
  transition: opacity 0.35s ease, transform 0.35s var(--ease);
}
.vcherry .cherry-svg { width: 100%; height: 100%; display: block; overflow: visible; }
@keyframes cherryBob {
  0%, 100% { transform: translateY(-50%) scale(1) rotate(-3deg); }
  50%      { transform: translateY(-58%) scale(1.04) rotate(3deg); }
}
.vcherry.eaten { animation: none; opacity: 0; transform: translateY(-50%) scale(0.2); }

/* 视频中央的半透明播放按钮：暂停时浮现，播放后消隐（不吃点击，避免挡住详情跳转） */
.vcenter {
  position: absolute; left: 50%; top: 50%; z-index: 3;
  width: 66px; height: 66px; border-radius: 50%;
  display: grid; place-items: center; color: #fff;
  background: rgba(10, 10, 14, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.32);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.8);
  pointer-events: none;
  opacity: 0; transform: translate(-50%, -50%) scale(0.82);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}
figure.media.is-paused .vcenter { opacity: 1; transform: translate(-50%, -50%) scale(1); pointer-events: auto; cursor: pointer; }
figure.media.is-paused .vcenter:hover { background: rgba(10, 10, 14, 0.55); }
.vcenter svg { width: 24px; height: 24px; margin-left: 3px; }
@media (max-width: 720px) { .vcenter { width: 52px; height: 52px; } .vcenter svg { width: 19px; height: 19px; } }

.vtime {
  flex: 0 0 auto; font-size: 11px; letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.72); font-variant-numeric: tabular-nums;
}
.vvol { flex: 0 0 auto; display: flex; align-items: center; gap: 8px; }
.vslider {
  width: 74px; height: 3px; appearance: none; -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.22); border-radius: 100px; outline: none; cursor: pointer;
}
.vslider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 11px; height: 11px; border-radius: 50%;
  background: #fff; box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}
.vslider::-moz-range-thumb { width: 11px; height: 11px; border: 0; border-radius: 50%; background: #fff; }
/* 窄卡片（<430px）：隐藏时间码、收窄音量条，进度条优先 */
.vbar.compact { gap: 9px; padding: 6px 10px; }
.vbar.compact .vtime { display: none; }
.vbar.compact .vslider { width: 52px; }
@media (max-width: 720px) {
  .vbar { gap: 8px; padding: 6px 10px; }
  .vtime { display: none; }
  .vslider { width: 46px; }
  .pac { width: 13px; height: 13px; }
  .vcherry { width: 12px; height: 12px; right: -6px; }
}

/* 全屏：整块媒体铺满，控制条跟着进去还能操作 */
figure.media:fullscreen {
  width: 100vw; height: 100vh; max-width: none; max-height: none;
  aspect-ratio: auto !important;   /* 盖掉各排版给媒体块设的宽高比 */
  border-radius: 0; border: 0; background: #05050a;
  display: flex; align-items: center; justify-content: center;
}
figure.media:-webkit-full-screen {
  width: 100vw; height: 100vh; max-width: none; max-height: none;
  aspect-ratio: auto !important;
  border-radius: 0; border: 0; background: #05050a;
  display: flex; align-items: center; justify-content: center;
}
figure.media:fullscreen > a, figure.media:-webkit-full-screen > a { width: 100%; height: 100%; display: block; }
figure.media:fullscreen img, figure.media:fullscreen video,
figure.media:-webkit-full-screen img, figure.media:-webkit-full-screen video {
  object-fit: contain; transform: none !important;
}
figure.media:fullscreen figcaption, figure.media:-webkit-full-screen figcaption {
  top: 0; bottom: auto; padding: 20px 24px;
  background: linear-gradient(to bottom, rgba(4, 4, 6, 0.72), transparent);
}
figure.media:fullscreen .vbar, figure.media:-webkit-full-screen .vbar {
  left: 6vw; right: 6vw; bottom: 34px; opacity: 1; background: rgba(8, 8, 11, 0.82);
}
figure.media:fullscreen .pac, figure.media:-webkit-full-screen .pac { width: 22px; height: 22px; }
figure.media:fullscreen .vcherry, figure.media:-webkit-full-screen .vcherry { width: 20px; height: 20px; right: -9px; }

/* 纯白占位块（素材未到位时先占住格子） */
figure.media.ph-white { background: #ffffff; border-color: rgba(255, 255, 255, 0.2); }
figure.media.ph-white::before {
  content: "待补充"; position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: #b9b9c0; font-size: 12px; letter-spacing: 0.4em; text-indent: 0.4em;
}

/* ---------- 详情页 · 按主次分级 ---------- */
.media-stack { margin-top: 76px; }
.media-group { margin-bottom: 76px; }
.group-title {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 12px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--dim);
  padding-bottom: 16px; border-bottom: 1px solid var(--line); margin-bottom: 30px;
}
.group-title span { color: var(--accent-b); font-size: 12px; letter-spacing: 0.1em; }
.g-main .group-grid { display: flex; flex-direction: column; gap: 28px; }
.g-sub .group-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.g-process .group-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.group-grid figure.media { aspect-ratio: 16 / 9; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .pb { padding: 64px 0; }
  .pb-media { gap: 14px; }
  .pb .pb-media figure.media:nth-child(n) {
    grid-column: 1 / -1; grid-row: auto; margin-top: 0; aspect-ratio: 16 / 9;
    height: auto; align-self: stretch;
  }
  .layout-i .pb-media { flex-direction: column; flex-wrap: nowrap; }
  .layout-i .pb-media figure.media:nth-child(n) {
    width: 100%; margin: 0; clip-path: none;
  }
  .pb-head { flex-wrap: wrap; gap: 16px; margin-bottom: 32px; }
  .pb-num { padding-bottom: 0; }
  .pb-more { padding-bottom: 0; }
  .g-sub .group-grid { grid-template-columns: repeat(2, 1fr); }
  .g-process .group-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .pb-head { flex-direction: column; align-items: flex-start; }
  .pb-summary { margin-top: 26px; font-size: 14.5px; }
  .g-sub .group-grid, .g-process .group-grid { grid-template-columns: 1fr; }
}

/* 截图检查模式（?shot=1）：压缩首屏便于整页检查 */
body.shot-mode .hero { min-height: 880px; }
body.shot-mode .hero-scroll { display: none; }
body.shot-mode .hero-bg img { animation: none; }

/* ============================================================
   悬浮返回按钮（详情页右下角）
   ============================================================ */
.back-fab {
  position: fixed; right: 36px; bottom: 36px; z-index: 95;
  display: inline-flex; align-items: center; gap: 9px;
  height: 54px; padding: 0 24px 0 20px; border-radius: 100px;
  background: rgba(14, 14, 18, 0.72);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid var(--line-strong); color: var(--text);
  font-size: 13.5px; letter-spacing: 0.08em; cursor: pointer;
  box-shadow: 0 14px 44px -14px rgba(0, 0, 0, 0.75);
  opacity: 0; transform: translateY(24px);
  animation: fabIn 0.9s var(--ease) 0.5s forwards;
  transition: transform 0.4s var(--ease), border-color 0.3s ease, box-shadow 0.4s ease;
}
@keyframes fabIn { to { opacity: 1; transform: translateY(0); } }

.back-fab svg { transition: transform 0.4s var(--ease); }

.back-fab:hover {
  transform: translateY(-5px) scale(1.06);
  border-color: rgba(255, 255, 255, 0.38);
  box-shadow:
    0 20px 56px -14px rgba(0, 0, 0, 0.85),
    0 0 28px rgba(125, 122, 255, 0.28),
    inset 0 0 18px rgba(125, 122, 255, 0.08);
}
.back-fab:hover svg { transform: translateX(-5px); }

.back-fab:active { transform: translateY(-1px) scale(0.9); transition-duration: 0.12s; }

/* 点击波纹 */
.back-fab::after {
  content: ""; position: absolute; inset: 0; border-radius: 100px;
  border: 1.5px solid rgba(125, 122, 255, 0.65);
  opacity: 0; pointer-events: none;
}
.back-fab.clicked::after { animation: fabRipple 0.65s ease-out; }
@keyframes fabRipple {
  from { opacity: 0.9; transform: scale(1); }
  to { opacity: 0; transform: scale(1.55); }
}

@media (max-width: 720px) {
  .back-fab { right: 18px; bottom: 18px; height: 48px; padding: 0 20px 0 16px; }
}

/* 减弱动效偏好下：按钮直接可见（跳过入场动画） */
@media (prefers-reduced-motion: reduce) {
  .back-fab { opacity: 1; transform: none; animation: none; }
}

/* ============================================================
   静帧放大层：点一下全屏看，再点一下还原
   ============================================================ */
body.lb-lock { overflow: hidden; }

.lightbox {
  position: fixed; inset: 0; z-index: 300;
  display: flex; align-items: center; justify-content: center;
  padding: 6vh 7vw;
  background: radial-gradient(120% 100% at 50% 40%, rgba(8, 8, 12, 0.82), rgba(3, 3, 5, 0.94));
  backdrop-filter: blur(22px) saturate(130%); -webkit-backdrop-filter: blur(22px) saturate(130%);
  opacity: 0; visibility: hidden;
  transition: opacity 0.32s var(--ease), visibility 0.32s;
}
.lightbox.open { opacity: 1; visibility: visible; }

.lb-stage {
  display: flex; flex-direction: column; align-items: center; gap: 18px;
  max-width: 100%; max-height: 100%;
}
.lb-img {
  max-width: 100%; max-height: 78vh;
  border-radius: var(--radius-s);
  border: 1px solid var(--line);
  box-shadow: 0 50px 140px -40px rgba(0, 0, 0, 0.95), 0 0 0 1px rgba(255, 255, 255, 0.04);
  cursor: zoom-out;
  opacity: 0; transform: scale(0.94);
  transition: opacity 0.3s var(--ease), transform 0.4s var(--ease);
}
.lightbox.open .lb-img { opacity: 1; transform: scale(1); }
/* 换图：先淡出再淡入（写在 .open 之后，保证能盖住它的 opacity: 1） */
.lb-stage.swapping .lb-img { opacity: 0; transform: scale(0.985); transition-duration: 0.13s; }

.lb-cap {
  display: flex; align-items: baseline; gap: 16px; width: 100%;
  font-size: 13px; color: var(--muted); letter-spacing: 0.02em;
}
.lb-text { flex: 1 1 auto; min-width: 0; }
.lb-count {
  flex: 0 0 auto; font-size: 12px; color: var(--dim);
  font-variant-numeric: tabular-nums; letter-spacing: 0.08em;
}

.lb-close, .lb-nav {
  position: absolute; z-index: 2;
  width: 46px; height: 46px; border-radius: 50%;
  display: grid; place-items: center;
  color: rgba(255, 255, 255, 0.86);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s var(--ease), opacity 0.25s ease;
}
.lb-close { top: 26px; right: 26px; }
.lb-close svg, .lb-nav svg { width: 16px; height: 16px; }
.lb-close:hover, .lb-nav:hover { background: rgba(255, 255, 255, 0.14); color: #fff; transform: scale(1.06); }
.lb-nav { top: 50%; transform: translateY(-50%); }
.lb-nav:hover { transform: translateY(-50%) scale(1.06); }
.lb-prev { left: 26px; }
.lb-next { right: 26px; }
.lb-single .lb-nav { display: none; }

.lb-hint {
  position: absolute; bottom: 26px; left: 0; right: 0;
  text-align: center; font-size: 12px; color: var(--dim); letter-spacing: 0.06em;
  pointer-events: none;
  animation: lbHint 4.2s var(--ease) forwards;
}
@keyframes lbHint {
  0% { opacity: 0; transform: translateY(6px); }
  12%, 68% { opacity: 1; transform: none; }
  100% { opacity: 0; transform: translateY(4px); }
}

/* 可放大的图片：给个放大镜光标暗示 */
img.zoomable { cursor: zoom-in; }

@media (max-width: 720px) {
  .lightbox { padding: 5vh 4vw; }
  .lb-img { max-height: 70vh; }
  .lb-close { top: 14px; right: 14px; width: 40px; height: 40px; }
  .lb-nav { width: 40px; height: 40px; }
  .lb-prev { left: 12px; }
  .lb-next { right: 12px; }
  .lb-hint { display: none; }
}
/* 减弱动效偏好下：直接显隐，不做缩放/淡入 */
@media (prefers-reduced-motion: reduce) {
  .lightbox, .lb-img { transition-duration: 0.01s; }
  .lb-hint { animation: none; opacity: 0.6; }
}