/* ============================================================
   JIAJIAN AI — 暗调版 · Floria-style dark luxury
   Off-black ground · bold sans + italic serif pairing ·
   rounded dark cards · images dissolving into darkness.
   ============================================================ */
:root {
  --bg: #0B0B0C;
  --bg-2: #0E0E10;
  --card: #141416;
  --card-2: #18181B;
  --line: rgba(255,255,255,.07);
  --line-strong: rgba(255,255,255,.14);
  --ink: #F1EFEA;
  --muted: #98948D;
  --dim: #827E77;
  --accent: #A89B82;        /* champagne brass */
  --accent-dim: rgba(168,155,130,.35);
  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif SC", "Source Han Serif SC", STSong, SimSun, serif;
  --sans-cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --sans-en: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --sans-display: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --r-lg: 22px;
  --r-md: 16px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { color-scheme: dark; scrollbar-color: #2E2C29 var(--bg); }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #2E2C29; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #44413C; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans-cn);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
::selection { background: var(--accent); color: #0B0B0C; }
/* 暗底键盘焦点：默认 outline 在深色上偏弱，统一加香槟金可见焦点环 */
a:focus-visible, button:focus-visible, .btn:focus-visible, .btn-text:focus-visible,
.nav-links a:focus-visible, .brand:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px;
}
/* 跳到主内容（WCAG 2.4.1）：平时移出视口，聚焦时显形置顶 */
.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 200;
  background: var(--ink); color: var(--bg);
  font-size: 13px; font-weight: 600; padding: 10px 18px; border-radius: 999px;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 16px; outline: 2px solid var(--accent); outline-offset: 3px; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 44px; }
@media (max-width: 720px) { .wrap { padding: 0 20px; } }
section { position: relative; padding: 130px 0; }

/* ---------- type helpers ---------- */
.h-sec {
  font-family: var(--sans-display);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700; letter-spacing: .01em; line-height: 1.25;
}
.sub { color: var(--muted); font-size: 14px; max-width: 740px; margin-top: 14px; }
.sec-row {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 30px; margin-bottom: 52px;
}
.mini-link {
  font-family: var(--sans-en); font-size: 10.5px; letter-spacing: .26em;
  text-transform: uppercase; color: var(--muted);
  display: inline-flex; align-items: center; gap: 8px;
  padding-bottom: 4px; border-bottom: 1px solid var(--line-strong);
  transition: color .3s, border-color .3s;
  white-space: nowrap;
}
.mini-link:hover { color: var(--ink); border-color: var(--ink); }
.mini-link svg { width: 12px; height: 12px; flex: none; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 14px; font-weight: 600;
  padding: 14px 30px; border-radius: 999px;
  border: 1px solid transparent;
  transform: translate(var(--mx, 0px), var(--my, 0px));
  transition: transform .3s var(--ease), background .3s, color .3s, border-color .3s;
  cursor: pointer; will-change: transform;
}
.btn:active { transform: translate(var(--mx, 0px), var(--my, 0px)) scale(.97); }
.btn-white { background: var(--ink); color: var(--bg); }
.btn-white:hover { background: #FBFAF7; }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); }
.btn-text {
  font-size: 14px; color: var(--muted); padding: 14px 6px;
  border-bottom: 1px solid transparent; transition: color .3s;
}
.btn-text:hover { color: var(--ink); }
.btn svg { width: 14px; height: 14px; }

/* ---------- nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: linear-gradient(rgba(11,11,12,.86), rgba(11,11,12,.62) 70%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.nav-in {
  max-width: 1180px; margin: 0 auto; padding: 0 44px;
  height: 72px; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; }
.brand .logo-nav { height: 30px; width: auto; display: block; }
.nav-links { display: flex; gap: 28px; font-size: 13px; color: var(--muted); }
.nav-links a { transition: color .3s; }
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav .btn { padding: 10px 22px; font-size: 13px; }
/* 阅读进度发丝线：transform-only，由 rAF 驱动 scaleX */
.nav-progress {
  position: absolute; left: 0; right: 0; bottom: 0; height: 1.5px;
  background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  pointer-events: none;
}
@media (max-width: 900px) { .nav-links { gap: 18px; font-size: 12px; } }
@media (max-width: 720px) { .nav-links { display: none; } .nav-in { padding: 0 20px; } }

/* ---------- 移动端汉堡菜单 ---------- */
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; }      /* 桌面隐藏，≤720px 显示 */
@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 42px; height: 42px; padding: 0 9px; flex: none;
    background: transparent; border: 1px solid var(--line-strong); border-radius: 999px;
    cursor: pointer; position: relative; z-index: 1;
  }
  .nav-contact { padding: 9px 18px; font-size: 12.5px; }
}
.nt-bar {
  display: block; height: 1.5px; width: 100%; background: var(--ink); border-radius: 2px;
  transition: transform .42s var(--ease), opacity .3s var(--ease);
}
/* 打开态：汉堡 → ×，顶栏抬到菜单之上，隐藏联系按钮 */
html.nav-open .nt-bar:nth-child(1) { transform: translateY(3.5px) rotate(45deg); }
html.nav-open .nt-bar:nth-child(2) { transform: translateY(-3.5px) rotate(-45deg); }
html.nav-open .nav { z-index: 130; }
html.nav-open .nav-contact { opacity: 0; pointer-events: none; transition: opacity .25s; }
html.nav-open { overflow: hidden; }

.mobile-menu {
  position: fixed; inset: 0; z-index: 110;
  background: var(--bg);
  opacity: 0; visibility: hidden;
  transition: opacity .45s var(--ease), visibility .45s var(--ease);
  display: none;
}
@media (max-width: 720px) { .mobile-menu { display: block; } }
html.nav-open .mobile-menu { opacity: 1; visibility: visible; }
.mm-inner {
  min-height: 100dvh; padding: 92px 24px 36px;
  display: flex; flex-direction: column;
}
.mm-eyebrow {
  font-family: var(--sans-en); font-size: 10px; letter-spacing: .28em;
  text-transform: uppercase; color: var(--dim);
}
.mm-list { list-style: none; margin: 22px 0 0; }
.mm-list li { border-top: 1px solid var(--line); }
.mm-list li:last-child { border-bottom: 1px solid var(--line); }
.mm-list a { display: flex; align-items: baseline; gap: 14px; padding: 19px 2px; }
.mm-no { font-family: var(--sans-en); font-size: 11px; letter-spacing: .1em; color: var(--accent); min-width: 22px; }
.mm-name { font-family: var(--sans-display); font-size: 26px; font-weight: 700; letter-spacing: -.01em; }
.mm-desc { margin-left: auto; font-size: 12.5px; color: var(--muted); }
.mm-foot { margin-top: auto; padding-top: 30px; }
.mm-cta { width: 100%; justify-content: center; }
.mm-contact { margin-top: 18px; display: flex; flex-direction: column; gap: 7px; }
.mm-contact a {
  font-family: var(--sans-en); font-size: 13px; letter-spacing: .04em; color: var(--muted);
  display: inline-flex; width: fit-content;
}
.mm-contact a:hover { color: var(--ink); }
/* 错峰入场：菜单项与底部 transform/opacity 升起 */
.mm-list li, .mm-foot { opacity: 0; transform: translateY(16px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
html.nav-open .mm-list li { opacity: 1; transform: none; transition-delay: calc(.12s + var(--i) * .055s); }
html.nav-open .mm-foot { opacity: 1; transform: none; transition-delay: .5s; }
@media (prefers-reduced-motion: reduce) {
  .nt-bar, .mm-list li, .mm-foot { transition: none; }
  .mm-list li, .mm-foot { transform: none; }
}

/* ---------- hero ---------- */
.hero {
  min-height: 100dvh;
  display: flex; align-items: center;
  padding: 150px 0 90px;
  overflow: hidden;
}
.hero-bleed {
  position: absolute; top: 0; right: 0; bottom: 0;
  width: min(52vw, 760px);
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,.95) 38%, transparent 96%);
  mask-image: linear-gradient(to left, rgba(0,0,0,.95) 38%, transparent 96%);
}
.hero-bleed img {
  width: 100%; height: 100%; object-fit: cover; object-position: 64% 30%;
  opacity: .8;
  filter: contrast(1.04) brightness(.92);
}
/* 粒子层：建成后隐藏原图，canvas 接管（沿用同一蒙版与压暗层） */
.hero-bleed canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  opacity: 0; transition: opacity 1.2s var(--ease);
}
.hero-bleed.particles-on canvas { opacity: .9; }
.hero-bleed.particles-on img { opacity: 0; transition: opacity .8s var(--ease); }
.hero-bleed::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to top, var(--bg), transparent 34%),
              linear-gradient(to bottom, rgba(11,11,12,.5), transparent 30%),
              linear-gradient(to right, transparent 55%, rgba(11,11,12,.55) 82%, var(--bg) 100%);
}
/* hero .wrap 是 flex 子项，需显式撑满 1180 列，否则会 shrink-wrap 并被居中 */
.hero > .wrap { width: 100%; }
.hero-inner { position: relative; z-index: 2; max-width: 680px; }
/* 标题：双行（粗黑中文 + 斜体衬线英文），干净实字 */
.hero-title { margin: 28px 0 8px; }
.hero-title .ln {
  display: block;
  font-family: var(--sans-display);
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 700; line-height: 1.1; letter-spacing: -.01em;
}
.hero-title .it {
  font-family: var(--serif); font-style: italic; font-weight: 400;
  color: var(--muted); letter-spacing: 0;
}
.hero .desc { color: var(--muted); font-size: 15px; max-width: 580px; margin-top: 22px; }
@media (max-width: 720px) { .hero .desc br { display: none; } }
.hero-cta { display: flex; align-items: center; gap: 16px; margin-top: 42px; flex-wrap: wrap; }
/* Stipple 式数据行：大字 + 中文标签 + 英文小注，置于发丝分隔线下 */
.hero-stats {
  margin-top: 62px; padding-top: 26px;
  border-top: 1px solid var(--line);
  display: flex; gap: 46px; flex-wrap: wrap;
}
.hstat b {
  display: block; font-family: var(--sans-en);
  font-size: 30px; font-weight: 700; line-height: 1; letter-spacing: -.02em;
}
.hstat span {
  margin-top: 8px; display: flex; align-items: baseline; gap: 8px;
  font-size: 12.5px; color: var(--muted);
}
.hstat span i {
  font-style: normal; font-family: var(--sans-en);
  font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: var(--muted);
}
/* 首屏入场编排：标题 → 文案 → 按钮 → 数据行，逐级升起 */
.js .hero-inner > * { animation: hero-up .9s var(--ease) backwards; }
.js .hero-inner > h1 { animation-delay: .08s; }
.js .hero-inner > .desc { animation-delay: .28s; }
.js .hero-inner > .hero-cta { animation-delay: .42s; }
.js .hero-inner > .hero-stats { animation-delay: .56s; }
@keyframes hero-up {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .js .hero-inner > * { animation: none; }
}
@media (max-width: 900px) {
  .hero-bleed { width: 100%; opacity: .35; }
  .hero { min-height: auto; }
}
/* 数据行窄屏：三栏等分、隐去英文小注，避免 2+1 不均换行 */
@media (max-width: 560px) {
  .hero-stats { gap: 0 22px; display: grid; grid-template-columns: repeat(3, auto); margin-top: 48px; }
  .hstat b { font-size: 26px; }
  .hstat span i { display: none; }
}

/* ---------- reveal ----------
   .rv  = 独立元素（标题/段落）：升起 + 淡入（keyframes，与 transition 解耦）
   .rv-f = 卡片/步骤等自带 hover transform 的元素：纯淡入，不碰 transform */
.js .rv, .js .rv-f { opacity: 0; }
.rv.in { opacity: 1; animation: rv-rise .9s var(--ease) var(--d, 0s) backwards; }
.rv-f.in { opacity: 1; animation: rv-fade .9s var(--ease) var(--d, 0s) backwards; }
@keyframes rv-rise {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: none; }
}
@keyframes rv-fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .rv, .rv-f { opacity: 1; }
  .rv.in, .rv-f.in { animation: none; }
}
/* 章节标题逐行升起（JS 包裹 .mask/.mask-in） */
.mask { display: block; overflow: hidden; }
.mask-in { display: block; transform: translateY(112%); transition: transform 1s var(--ease) .1s; }
.in .mask-in { transform: none; }
@media (prefers-reduced-motion: reduce) { .mask-in { transform: none; transition: none; } }
/* 3D 倾斜卡（JS 写 inline transform，此处只管回弹手感） */
.prod-card.tilting { transition: transform .14s ease-out, border-color .45s, background .45s; will-change: transform; }

/* ---------- product cards (精选出品) ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.prod-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 10px;
  transition: transform .45s var(--ease), border-color .45s, background .45s;
}
.prod-card:hover { border-color: var(--line-strong); background: var(--card-2); }
.prod-card .ph {
  border-radius: calc(var(--r-lg) - 8px); overflow: hidden;
  aspect-ratio: 4/4.6; background: #1A1A1C; position: relative;
}
.prod-card .ph img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.1s var(--ease); }
@media (hover: hover) and (pointer: fine) {
  .prod-card:hover { transform: translateY(-6px); }
  .prod-card:hover .ph img { transform: scale(1.05); }
}
.prod-meta { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; padding: 16px 10px 10px; }
.prod-meta h3 { font-size: 15.5px; font-weight: 600; }
.prod-meta .price { font-family: var(--sans-en); font-size: 13px; color: var(--muted); white-space: nowrap; }
.prod-meta .en { display: block; font-family: var(--sans-en); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--dim); margin-top: 4px; }
@media (max-width: 900px) { .prod-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) {
  .prod-grid { grid-template-columns: 1fr; }
  .prod-card .ph { aspect-ratio: 4/5; }
}

/* ---------- process (确定性流程) ---------- */
.process { overflow: hidden; }
.proc-bleed {
  position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: min(40vw, 560px); height: 84%;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to right, rgba(0,0,0,.9) 30%, transparent 95%);
  mask-image: linear-gradient(to right, rgba(0,0,0,.9) 30%, transparent 95%);
}
.proc-bleed img { width: 100%; height: 100%; object-fit: cover; opacity: .5; filter: brightness(.85); }
@media (max-width: 900px) {
  .proc-bleed { display: none; }
}

/* ---------- numbers (确定性。 scattered stat cards) ---------- */
.clarity { padding-top: 150px; }
.clarity .h-it {
  text-align: center;
  font-family: var(--serif); font-style: italic; font-weight: 400;
  font-size: clamp(38px, 5vw, 60px); color: var(--ink);
  margin-bottom: 90px;
}
.scatter { position: relative; display: grid; grid-template-columns: repeat(12, 1fr); gap: 22px; }
.stat-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 34px 32px 30px;
  transition: transform .45s var(--ease), border-color .45s;
}
.stat-card:hover { border-color: var(--line-strong); }
.stat-card .num {
  font-family: var(--sans-en); font-size: 54px; font-weight: 700; line-height: 1;
  letter-spacing: -.02em;
}
.stat-card .num small { font-size: .5em; font-weight: 700; color: var(--accent); }
.stat-card h3 { font-size: 15px; font-weight: 600; margin-top: 18px; }
.stat-card p { font-family: var(--sans-en); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--dim); margin-top: 5px; }
.sc-1 { grid-column: 1 / span 4; }
.sc-2 { grid-column: 6 / span 4; transform: translateY(56px); }
.sc-3 { grid-column: 3 / span 4; margin-top: 30px; }
.sc-4 { grid-column: 8 / span 4; transform: translateY(26px); }
@media (hover: hover) and (pointer: fine) {
  .stat-card:hover { transform: translateY(-6px); }
  .sc-2:hover { transform: translateY(50px); }
  .sc-4:hover { transform: translateY(20px); }
}
.scatter-foot { margin-top: 130px; text-align: center; color: var(--muted); font-size: 12px; }
@media (max-width: 900px) {
  .scatter { grid-template-columns: 1fr; }
  .sc-1, .sc-2, .sc-3, .sc-4 { grid-column: 1; transform: none !important; margin-top: 0; }
  .scatter-foot { margin-top: 50px; }
}

/* ---------- statement (巨型宣言) ---------- */
.statement {
  text-align: center; padding: 190px 0;
  overflow: hidden;
}
.statement .ghost-img {
  position: absolute; inset: -10% 0; pointer-events: none;
  display: flex; align-items: center; justify-content: center;
}
.statement .ghost-img img {
  width: min(640px, 80vw); height: 110%; object-fit: cover;
  opacity: .14;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 30%, transparent 75%);
}
.statement .logo-mark {
  width: 56px; height: auto; display: block;
  margin: 0 auto 36px; opacity: .92;
  position: relative; z-index: 2;
}
.statement h2 {
  position: relative; z-index: 2;
  font-size: clamp(34px, 5.4vw, 64px); font-weight: 700; line-height: 1.25;
}
.statement h2 .it { font-family: var(--serif); font-style: italic; font-weight: 400; }
.statement .sub { position: relative; z-index: 2; margin: 26px auto 0; text-align: center; max-width: 460px; }

/* ---------- training ---------- */
.training-row {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 90px 0;
}
.tr-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 80px; align-items: center; }
.tr-grid h2 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 700; line-height: 1.3; }
.tr-grid h2 .it { font-family: var(--serif); font-style: italic; font-weight: 400; color: var(--accent); }
.tr-grid .lead { color: var(--muted); font-size: 14.5px; margin-top: 18px; max-width: 480px; }
.tr-list { display: grid; gap: 0; }
.tr-item {
  display: flex; justify-content: space-between; align-items: baseline; gap: 20px;
  padding: 22px 4px; border-bottom: 1px solid var(--line);
}
.tr-item:first-child { border-top: 1px solid var(--line); }
.tr-item b { font-family: var(--sans-en); font-size: 22px; font-weight: 700; white-space: nowrap; }
.tr-item span { color: var(--muted); font-size: 13px; text-align: right; }
@media (max-width: 900px) { .tr-grid { grid-template-columns: 1fr; gap: 44px; } }
/* ---- 培训：承诺大标题 + 中轴折线流程 + 定价 ---- */
.tr-promise {
  margin: 84px auto 0; max-width: 980px;
  font-family: var(--sans-display);
  font-size: clamp(24px, 3.1vw, 40px); font-weight: 700; line-height: 1.72;
}
.tr-promise em {
  font-style: normal; padding-bottom: 8px;
  border-bottom: 1px solid var(--accent-dim);
}
.vtl { position: relative; max-width: 920px; margin: 72px auto 0; padding: 8px 0 0; }
.vtl::before {
  content: ""; position: absolute; left: 50%; top: 0; bottom: 0;
  width: 1px; margin-left: -.5px; background: var(--line-strong);
}
.vtl-step { position: relative; width: 50%; padding: 0 56px 56px 0; text-align: right; }
.vtl-step:nth-child(even) { margin-left: 50%; padding: 0 0 56px 56px; text-align: left; }
.vtl-step:last-child { padding-bottom: 4px; }
.vtl-step .dot {
  position: absolute; right: -5.5px; top: 3px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--bg); border: 1px solid var(--accent);
  transition: transform .6s var(--ease), background .6s var(--ease);
}
.vtl-step:nth-child(even) .dot { right: auto; left: -5.5px; }
.vtl-step.in .dot { background: var(--ink); border-color: var(--ink); transform: scale(1.25); }
.vtl-step .no { font-family: var(--sans-en); font-size: 11px; letter-spacing: .22em; color: var(--accent); }
.vtl-step h4 { font-size: 17.5px; font-weight: 700; margin-top: 8px; line-height: 1.5; }
.tr-price {
  max-width: 920px; margin: 78px auto 0;
  padding-top: 40px; border-top: 1px solid var(--line);
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 16px 36px; flex-wrap: wrap;
}
.tr-price .tp-name { font-family: var(--sans-en); font-size: 11px; letter-spacing: .2em; color: var(--accent); text-transform: uppercase; }
.tr-price .tp-big {
  font-family: var(--sans-en); font-size: clamp(40px, 4.6vw, 58px);
  font-weight: 700; line-height: 1; letter-spacing: -.02em;
}
.tr-price .tp-terms { color: var(--muted); font-size: 13.5px; }
@media (max-width: 720px) {
  .vtl::before { left: 5px; }
  .vtl-step, .vtl-step:nth-child(even) { width: 100%; margin-left: 0; padding: 0 0 42px 32px; text-align: left; }
  .vtl-step .dot, .vtl-step:nth-child(even) .dot { left: 0; right: auto; }
}

/* ---------- CTA banner ---------- */
.cta { padding: 130px 0 150px; }
.cta-card {
  position: relative; border-radius: 28px; overflow: hidden;
  min-height: 420px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 70px 30px;
  border: 1px solid var(--line-strong);
}
.cta-card .bg { position: absolute; inset: 0; }
.cta-card .bg img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 28%; }
.cta-card .bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(rgba(9,9,10,.62), rgba(9,9,10,.78));
}
.cta-card > * { position: relative; z-index: 2; }
.cta-card h2 { font-size: clamp(28px, 4vw, 46px); font-weight: 700; line-height: 1.3; }
.cta-card h2 .it { font-family: var(--serif); font-style: italic; font-weight: 400; }
.cta-card .sub { text-align: center; margin: 16px auto 0; max-width: 430px; color: rgba(255,255,255,.72); }
.cta-actions { display: flex; gap: 14px; margin-top: 38px; flex-wrap: wrap; justify-content: center; }

/* ---------- footer ---------- */
.footer {
  position: relative; padding: 120px 0 40px; overflow: hidden;
  background: var(--bg-2);
  border-top: 1px solid var(--line);
}
.footer .watermark {
  position: absolute; right: -2%; bottom: -6%;
  font-family: var(--sans-en); font-weight: 700;
  font-size: clamp(120px, 22vw, 300px); line-height: 1; letter-spacing: -.02em;
  color: rgba(255,255,255,.025); pointer-events: none; user-select: none;
  white-space: nowrap;
}
.f-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 50px; position: relative; z-index: 2; }
.f-brand .logo-foot { height: 52px; width: auto; display: block; }
.f-brand .tagline { font-family: var(--serif); font-style: italic; color: var(--accent); font-size: 17px; margin-top: 14px; }
.f-brand p { color: var(--muted); font-size: 13px; margin-top: 22px; max-width: 300px; }
.f-col h3 {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; margin-bottom: 20px;
}
.f-col h3::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
.f-col a, .f-col span { display: block; color: var(--muted); font-size: 13px; padding: 5px 0; transition: color .3s; }
.f-col a:hover { color: var(--ink); }
.f-bottom {
  position: relative; z-index: 2;
  margin-top: 90px; padding-top: 26px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  font-size: 11.5px; color: var(--muted);
}
.f-bottom .links { display: flex; gap: 22px; font-family: var(--sans-en); letter-spacing: .18em; text-transform: uppercase; font-size: 9.5px; }
@media (max-width: 900px) { .f-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .f-grid { grid-template-columns: 1fr; } }

/* ---------- section eyebrow (EN micro-label) ---------- */
.eyebrow {
  font-family: var(--sans-en); font-size: 10.5px; letter-spacing: .26em;
  text-transform: uppercase; color: var(--accent);
  display: flex; align-items: center; gap: 12px; margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 30px; height: 1px; background: var(--accent); flex: none; }

/* ---------- pain points (核心痛点) ---------- */
.pain-list { border-top: 1px solid var(--line); margin-top: 6px; }
.pain-row {
  display: grid; grid-template-columns: 86px minmax(120px, 220px) 1fr; gap: 28px;
  align-items: baseline; padding: 30px 8px; border-bottom: 1px solid var(--line);
  transition: padding-left .45s var(--ease), background .45s;
}
.pain-row .pn { font-family: var(--sans-en); font-size: 13px; letter-spacing: .18em; color: var(--accent); }
.pain-row h3 { font-size: clamp(20px, 2.4vw, 28px); font-weight: 700; }
.pain-row p { color: var(--muted); font-size: 14px; }
@media (hover: hover) and (pointer: fine) {
  .pain-row:hover { padding-left: 18px; background: rgba(255,255,255,.025); }
}
.value-line {
  margin-top: 58px; max-width: 840px;
  font-size: clamp(18px, 2.2vw, 27px); font-weight: 600; line-height: 1.6;
}
.value-line em { font-style: normal; color: var(--accent); }
.value-chips { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.value-chips span {
  font-size: 13px; padding: 9px 20px; border: 1px solid var(--line-strong);
  border-radius: 999px; color: var(--muted);
  transition: color .3s, border-color .3s, background .3s;
}
.value-chips span:hover { color: var(--ink); border-color: var(--ink); background: rgba(255,255,255,.03); }
@media (max-width: 720px) {
  .pain-row { grid-template-columns: 50px 1fr; row-gap: 8px; }
  .pain-row p { grid-column: 1 / -1; }
}

/* ---------- AI models gallery ---------- */
.model-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.model-cell {
  position: relative; overflow: hidden; border-radius: var(--r-md);
  aspect-ratio: 3/4; background: #1A1A1C; border: 1px solid var(--line);
}
.model-cell img { width: 100%; height: 100%; object-fit: cover; transition: transform 1s var(--ease); cursor: zoom-in; }
.model-cell .ml {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 44px 16px 14px; pointer-events: none;
  background: linear-gradient(transparent, rgba(8,8,9,.82));
  font-size: 12.5px; letter-spacing: .04em; color: #fff;
  opacity: 0; transform: translateY(8px); transition: opacity .4s var(--ease), transform .4s var(--ease);
}
@media (hover: hover) and (pointer: fine) {
  .model-cell:hover img { transform: scale(1.06); }
  .model-cell:hover .ml { opacity: 1; transform: none; }
}
.style-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.style-tags span {
  font-size: 12.5px; padding: 8px 18px; border: 1px solid var(--line);
  border-radius: 999px; color: var(--muted); transition: color .3s, border-color .3s;
}
.style-tags span:hover { color: var(--ink); border-color: var(--line-strong); }
@media (max-width: 900px) { .model-grid { grid-template-columns: repeat(2, 1fr); } }

/* ---------- kinetic image marquee ---------- */
.marquee {
  overflow: hidden; padding: 24px 0; margin: 40px 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.marquee-track { display: flex; gap: 16px; width: max-content; animation: mq 64s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-track .m-cell { width: 188px; aspect-ratio: 3/4; overflow: hidden; border-radius: 12px; flex: none; }
.marquee-track .m-cell img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s var(--ease); }
@media (hover: hover) { .marquee-track .m-cell:hover img { transform: scale(1.06); } }
@keyframes mq { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .marquee-track { animation: none; } }

/* ---------- style cases (风格案例) ---------- */
.cases { margin-top: 4px; }
.case-row { padding: 56px 0; border-top: 1px solid var(--line); }
.case-row:first-child { border-top: none; padding-top: 8px; }
.case-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 22px; margin-bottom: 26px; flex-wrap: wrap;
}
.case-head .l { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.case-idx { font-family: var(--sans-en); font-size: 11px; letter-spacing: .2em; color: var(--accent); }
.case-head h3 { font-size: clamp(21px, 2.6vw, 30px); font-weight: 700; }
.case-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.case-meta span {
  font-family: var(--sans-en); font-size: 9.5px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--line-strong); padding: 6px 12px; border-radius: 999px;
}
.case-cluster { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 14px; }
.case-row:nth-child(even) .case-cluster { grid-template-columns: 1fr 1fr 1fr 1.5fr; }
/* 8 图案例：同一行内第二段拼贴宽格换边，形成杂志对页式错位 */
.case-cluster + .case-cluster { margin-top: 14px; }
.case-row .case-cluster.flip { grid-template-columns: 1fr 1fr 1fr 1.5fr; }
.case-cluster .cc { overflow: hidden; border-radius: 12px; aspect-ratio: 3/4; background: #1A1A1C; border: 1px solid var(--line); }
.case-cluster img { width: 100%; height: 100%; object-fit: cover; transition: transform 1s var(--ease); cursor: zoom-in; }
@media (hover: hover) and (pointer: fine) { .case-cluster .cc:hover img { transform: scale(1.05); } }
@media (max-width: 900px) {
  .case-cluster, .case-row:nth-child(even) .case-cluster,
  .case-row .case-cluster.flip { grid-template-columns: 1fr 1fr; }
}

.case-more {
  display: flex; justify-content: space-between; align-items: center; gap: 24px;
  border-top: 1px solid var(--line);
  margin-top: 14px; padding: 52px 0 10px;
  flex-wrap: wrap;
}
.case-more p {
  color: var(--ink); font-weight: 600;
  font-size: clamp(19px, 2.3vw, 26px); line-height: 1.5;
}
.case-more .mini-link { font-size: 14px; letter-spacing: .22em; padding-bottom: 6px; }
.case-more .mini-link svg { width: 17px; height: 17px; }

/* ---------- material guideline (素材规范) ---------- */
.std-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.std-cell .sf {
  aspect-ratio: 3/4.4; overflow: hidden; border-radius: 12px;
  background: #1A1A1C; border: 1px solid var(--line);
}
.std-cell img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s var(--ease); cursor: zoom-in; }
@media (hover: hover) and (pointer: fine) { .std-cell:hover img { transform: scale(1.04); } }
.std-cell h4 { font-size: 14.5px; font-weight: 600; margin-top: 14px; }
.std-cell p { font-family: var(--sans-en); font-size: 9.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--dim); margin-top: 3px; }
.mat-note { margin-top: 26px; font-size: 13.5px; color: var(--muted); }
.mat-rows { margin-top: 50px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.mat-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-md); padding: 28px 26px; transition: border-color .4s, transform .4s var(--ease); }
.mat-card:hover { border-color: var(--line-strong); }
@media (hover: hover) and (pointer: fine) { .mat-card:hover { transform: translateY(-4px); } }
.mat-card h4 { font-size: 16.5px; font-weight: 600; margin-bottom: 8px; }
.mat-card p { font-size: 13.5px; color: var(--muted); }
.principle {
  margin-top: 50px; padding: 36px 42px; border-left: 2px solid var(--accent);
  background: var(--card); border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: clamp(16px, 1.8vw, 20px); font-weight: 600; line-height: 1.7;
}
.principle small { display: block; margin-top: 10px; font-size: 13px; font-weight: 400; color: var(--muted); }
@media (max-width: 900px) { .std-grid { grid-template-columns: repeat(3, 1fr); } .mat-rows { grid-template-columns: 1fr; } }
@media (max-width: 560px) { .std-grid { grid-template-columns: repeat(2, 1fr); } }

/* ---------- workflow (合作流程, enriched) ---------- */
.flow-note {
  display: inline-flex; align-items: center; gap: 10px; font-size: 13.5px;
  border: 1px solid var(--line-strong); border-radius: 999px; padding: 9px 22px;
  margin-bottom: 44px; color: var(--ink);
}
.flow-note svg { width: 15px; height: 15px; stroke: var(--accent); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.flow { position: relative; }
.flow::before { content: ""; position: absolute; left: 18px; top: 24px; bottom: 24px; width: 1px; background: var(--line); }
.flow-step {
  position: relative; display: grid; grid-template-columns: 38px 1fr; gap: 24px;
  align-items: center; padding: 16px 0;
}
.flow-step .fn {
  width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line-strong);
  background: var(--bg); display: flex; align-items: center; justify-content: center;
  font-family: var(--sans-en); font-size: 11px; color: var(--muted);
  position: relative; z-index: 1; transition: border-color .4s, color .4s;
}
.flow-step:hover .fn { border-color: var(--accent); color: var(--ink); }
.flow-step h4 { font-size: clamp(15px, 1.7vw, 18px); font-weight: 600; }
.flow-foot { margin-top: 40px; font-size: 13.5px; color: var(--muted); max-width: 720px; }
.deliver { margin-top: 60px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.deliver-row { border-top: 1px solid var(--line-strong); padding-top: 20px; }
.deliver-row .en { font-family: var(--sans-en); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--accent); }
.deliver-row h4 { font-size: 17px; font-weight: 600; margin: 10px 0 6px; }
.deliver-row p { font-size: 13.5px; color: var(--muted); }
.flow-2col { display: grid; grid-template-columns: .82fr 1.18fr; gap: 70px; align-items: start; }
.flow-2col > .flow-intro { position: sticky; top: 100px; }
.flow-intro .lead { color: var(--muted); font-size: 14.5px; margin: 18px 0 0; max-width: 360px; }
@media (max-width: 900px) {
  .flow-2col { grid-template-columns: 1fr; gap: 40px; }
  .flow-2col > .flow-intro { position: static; }
  .deliver { grid-template-columns: 1fr; }
}

/* ---------- pricing (报价) ---------- */
.price-row {
  display: grid; grid-template-columns: .92fr 1.08fr; gap: 56px;
  padding: 64px 0; border-top: 1px solid var(--line);
  align-items: center;
}
.price-row:first-of-type { border-top: none; padding-top: 10px; }
.price-idx { font-family: var(--sans-en); font-size: 11px; letter-spacing: .2em; color: var(--accent); }
.price-row h3 { font-size: clamp(22px, 2.6vw, 30px); font-weight: 700; margin-top: 12px; }
.price-row .en {
  display: block; font-family: var(--sans-en); font-size: 10px; letter-spacing: .22em;
  text-transform: uppercase; color: var(--dim); margin-top: 6px;
}
.price-big {
  margin-top: 26px;
  font-family: var(--sans-en); font-size: clamp(40px, 4.6vw, 58px);
  font-weight: 700; line-height: 1; letter-spacing: -.02em;
}
.price-big small { font-size: .32em; font-weight: 600; color: var(--accent); letter-spacing: .04em; margin-left: 8px; }
.price-terms { list-style: none; margin-top: 26px; display: grid; gap: 10px; }
.price-terms li {
  position: relative; padding-left: 18px;
  font-size: 13.5px; color: var(--muted);
}
.price-terms li::before {
  content: ""; position: absolute; left: 0; top: .58em;
  width: 5px; height: 5px; border-radius: 50%; background: var(--accent);
}
.price-terms li b { color: var(--ink); font-weight: 600; }
.price-imgs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.price-imgs .pi {
  overflow: hidden; border-radius: 12px; aspect-ratio: 3/4;
  background: #1A1A1C; border: 1px solid var(--line);
}
.price-imgs img { width: 100%; height: 100%; object-fit: cover; transition: transform 1s var(--ease); cursor: zoom-in; }
@media (hover: hover) and (pointer: fine) { .price-imgs .pi:hover img { transform: scale(1.05); } }
.price-note { margin-top: 14px; font-size: clamp(15px, 1.4vw, 17px); color: var(--muted); line-height: 1.7; }
.price-note b { color: var(--ink); font-weight: 600; }
@media (max-width: 900px) { .price-note { font-size: 15px; } }
@media (max-width: 900px) {
  .price-row { grid-template-columns: 1fr; gap: 30px; padding: 48px 0; }
}

/* ---------- lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(8,8,9,.94);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; visibility: hidden;
  transition: opacity .35s, visibility .35s;
}
.lightbox.open { opacity: 1; pointer-events: auto; visibility: visible; }
.lightbox img { max-width: 88vw; max-height: 88vh; object-fit: contain; border-radius: 8px; }
.lightbox .close {
  position: absolute; top: 26px; right: 34px; color: var(--muted);
  font-family: var(--sans-en); font-size: 11px; letter-spacing: .26em;
  cursor: pointer; text-transform: uppercase;
  background: none; border: 0; padding: 8px;
}
.lightbox .close:hover, .lightbox .close:focus-visible { color: var(--ink); }