:root {
  --bg: #050403;
  --bg-2: #100c08;
  --surface: #12100d;
  --surface-soft: #1b1510;
  --ink: #fffaf1;
  --text: #efe2cf;
  --muted: #b8aa97;
  --line: rgba(229, 203, 151, 0.2);
  --gold: #c9953e;
  --gold-2: #f4d99a;
  --gold-deep: #8f6024;
  --smoke: #2a241d;
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(120deg, rgba(5, 4, 3, 0.98), rgba(18, 13, 8, 0.98)),
    linear-gradient(90deg, rgba(244, 217, 154, 0.026) 1px, transparent 1px),
    linear-gradient(180deg, rgba(244, 217, 154, 0.022) 1px, transparent 1px);
  background-size: auto, 72px 72px, 72px 72px;
}

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

img {
  display: block;
  width: 100%;
}

button,
input,
textarea {
  font: inherit;
}

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto auto;
  align-items: center;
  gap: 22px;
  padding: 14px 56px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(5, 4, 3, 0.78);
  backdrop-filter: blur(18px);
  transition: background 0.25s ease, box-shadow 0.25s ease, padding 0.25s ease;
}

.site-header.scrolled {
  padding-top: 10px;
  padding-bottom: 10px;
  background: rgba(5, 4, 3, 0.94);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.26);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand-logo {
  width: 52px;
  height: 52px;
  flex: 0 0 auto;
  object-fit: contain;
  border: 1px solid rgba(244, 217, 154, 0.42);
  border-radius: 8px;
  background: #070605;
}

.section-action {
  margin-top: 26px;
}

.link-card {
  position: relative;
  min-height: 250px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.link-card:hover {
  border-color: rgba(244, 217, 154, 0.54);
  transform: translateY(-4px);
}

.link-card > strong:last-child {
  position: absolute;
  right: 26px;
  bottom: 24px;
  left: 26px;
  color: var(--gold-2);
  font-size: 14px;
}

.credibility-band {
  background: #080604;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.proof-item {
  display: grid;
  gap: 8px;
  min-height: 150px;
  align-content: center;
  padding: 28px;
  background: #0c0907;
}

.proof-item strong {
  color: var(--gold-2);
  font-size: 34px;
  line-height: 1;
}

.proof-item span {
  color: var(--muted);
}

.feature-band {
  min-height: 440px;
  display: grid;
  align-items: center;
  background-position: center;
  background-size: cover;
}

.training-teaser {
  background:
    linear-gradient(90deg, rgba(5, 4, 3, 0.98) 0%, rgba(10, 7, 5, 0.9) 56%, rgba(10, 7, 5, 0.46) 100%),
    url("assets/ai-zhichuang/image3.jpeg") center / cover;
}

.feature-band-copy {
  max-width: 720px;
}

.feature-band-copy > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 17px;
}

.contact-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 32px;
  border-top: 1px solid var(--line);
}

.contact-strip h2 {
  margin-bottom: 0;
}

.contact-strip-actions {
  display: flex;
  gap: 12px;
}

.page-hero {
  position: relative;
  min-height: 480px;
  display: grid;
  align-items: end;
  overflow: hidden;
  padding: 70px 56px 58px;
  border-bottom: 1px solid var(--line);
  background: #090705;
}

.page-hero-image,
.page-hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-hero-image {
  object-fit: cover;
}

.page-hero-shade {
  background: linear-gradient(90deg, rgba(3, 3, 3, 0.96) 0%, rgba(7, 5, 4, 0.82) 55%, rgba(7, 5, 4, 0.36) 100%), linear-gradient(180deg, transparent, rgba(5, 4, 3, 0.92));
}

.page-hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.page-hero h1 {
  font-size: 60px;
}

.page-hero p:not(.eyebrow) {
  max-width: 700px;
  color: #e9dfd1;
  font-size: 19px;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.content-panel {
  padding: 28px;
  border-top: 1px solid var(--line);
}

.content-panel p {
  color: var(--muted);
}

.image-copy-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.82fr) minmax(0, 1.18fr);
  gap: 44px;
  align-items: center;
}

.image-copy-grid > img {
  max-height: 680px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.case-filters {
  display: inline-grid;
  grid-template-columns: repeat(5, auto);
  gap: 0;
  margin-bottom: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.case-filters button {
  min-height: 42px;
  padding: 0 16px;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.035);
  cursor: pointer;
}

.case-filters button:last-child {
  border-right: 0;
}

.case-filters button.active {
  color: #11160f;
  background: var(--gold-2);
}

.brand strong,
.brand small {
  display: block;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand strong {
  color: var(--ink);
  font-size: 18px;
  font-weight: 800;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #d8c9b6;
  font-size: 14px;
}

.nav a {
  position: relative;
  padding: 9px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 4px;
  left: 0;
  height: 2px;
  background: var(--gold-2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.nav a:hover,
.nav a.active {
  color: var(--ink);
}

.nav a:hover::after,
.nav a.active::after {
  transform: scaleX(1);
}

.header-call {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  color: #17100a;
  border-radius: 8px;
  background: var(--gold-2);
  font-weight: 800;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(244, 217, 154, 0.06);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hero {
  position: relative;
  display: grid;
  min-height: 70svh;
  align-items: center;
  overflow: hidden;
  padding: 74px 56px 58px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-image,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-image {
  height: 100%;
  object-fit: cover;
  transform: scale(1.03);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(3, 3, 3, 0.94) 0%, rgba(9, 7, 5, 0.84) 42%, rgba(9, 7, 5, 0.34) 100%),
    linear-gradient(180deg, rgba(5, 4, 3, 0.18), rgba(5, 4, 3, 0.94));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold-2);
  font-size: 14px;
  font-weight: 800;
}

h1,
h2,
h3,
p,
dl,
dd {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: 72px;
  line-height: 1.05;
  font-weight: 900;
}

h2 {
  margin-bottom: 16px;
  color: var(--ink);
  font-size: 42px;
  line-height: 1.2;
  font-weight: 860;
}

h3 {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.3;
}

.hero-lead {
  margin-bottom: 10px;
  color: var(--gold-2);
  font-size: 28px;
  line-height: 1.35;
  font-weight: 800;
}

.hero-copy {
  max-width: 680px;
  color: #e9dfd1;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 30px 0 34px;
}

.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 850;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn.primary {
  color: #11160f;
  background: var(--gold-2);
}

.btn.secondary {
  color: var(--ink);
  border-color: rgba(240, 216, 150, 0.34);
  background: rgba(255, 255, 255, 0.06);
}

.hero-stats {
  display: grid;
  max-width: 680px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0 auto;
}

.hero-stats div {
  min-width: 0;
  padding: 16px;
  border: 1px solid rgba(240, 216, 150, 0.28);
  border-radius: 8px;
  background: rgba(5, 4, 3, 0.64);
  text-align: center;
}

.hero-stats dt {
  color: var(--ink);
  font-size: 28px;
  line-height: 1.1;
  font-weight: 900;
}

.hero-stats dd {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.section {
  position: relative;
  padding: 48px 56px;
}

.section[id] {
  scroll-margin-top: 78px;
}

.section-heading {
  max-width: 880px;
  margin-bottom: 24px;
}

.section-heading p:not(.eyebrow),
.split-copy > p,
.company-copy > p,
.contact-copy > p {
  max-width: 760px;
  color: var(--muted);
  font-size: 17px;
}

.intro-band,
.visual-section,
.process-section {
  background: linear-gradient(180deg, rgba(244, 217, 154, 0.035), rgba(255, 255, 255, 0));
}

.pillar-grid,
.service-grid,
.system-grid,
.team-grid,
.value-compare {
  display: grid;
  gap: 18px;
}

.pillar-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.service-grid,
.team-grid,
.value-compare {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.system-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.pillar-card,
.service-card,
.flow-card,
.compare-block,
.system-grid article,
.team-card,
.contact-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(30, 24, 18, 0.94), rgba(12, 10, 8, 0.96));
  box-shadow: var(--shadow);
}

.pillar-card,
.service-card,
.flow-card,
.compare-block,
.system-grid article,
.contact-panel {
  padding: 26px;
}

.pillar-card span,
.service-index,
.flow-card span,
.timeline span,
.feature-list span {
  color: var(--gold-2);
  font-size: 15px;
  font-weight: 900;
}

.pillar-card p,
.service-card p,
.flow-card p,
.compare-block span,
.system-grid p,
.team-card p,
.timeline p,
.contact-panel p,
.feature-list p {
  color: var(--muted);
}

.service-card {
  min-height: 260px;
}

.service-card strong {
  display: inline-flex;
  margin-bottom: 16px;
  color: var(--gold-2);
  font-size: 15px;
}

.case-section {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(244, 217, 154, 0.035));
}

.public-case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.public-case-card,
.public-case-empty {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(30, 24, 18, 0.94), rgba(12, 10, 8, 0.96));
  box-shadow: var(--shadow);
}

.public-case-card {
  display: grid;
  gap: 18px;
  padding: 26px;
}

.public-case-empty {
  grid-column: 1 / -1;
  padding: 42px 24px;
  color: var(--muted);
  text-align: center;
}

.public-case-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.public-case-type,
.public-case-featured {
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  padding: 0 10px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 850;
}

.public-case-type {
  color: var(--gold-2);
  border: 1px solid rgba(244, 217, 154, 0.28);
  background: rgba(244, 217, 154, 0.07);
}

.public-case-featured {
  color: #11160f;
  background: var(--gold-2);
}

.public-case-card h3 {
  margin-bottom: 0;
}

.public-case-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.public-case-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.public-case-metric {
  min-width: 0;
  padding: 12px 10px;
  border: 1px solid rgba(244, 217, 154, 0.15);
  border-radius: 8px;
  background: rgba(244, 217, 154, 0.045);
}

.public-case-metric strong {
  display: block;
  color: var(--gold-2);
  font-size: 22px;
  line-height: 1.15;
}

.public-case-metric span {
  color: var(--muted);
  font-size: 12px;
}

.public-case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.public-case-tags span {
  padding: 4px 10px;
  border: 1px solid rgba(244, 217, 154, 0.16);
  border-radius: 8px;
  color: var(--muted);
  font-size: 12px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.96fr);
  gap: 44px;
  align-items: center;
}

.avatar-section .split-copy {
  max-width: 1040px;
}

.avatar-section .feature-list {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.company-section {
  background: #080604;
}

.company-copy {
  max-width: 1040px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.feature-list article {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.visual-flow {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}

.flow-card-gallery {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(320px, 1.18fr);
  align-items: stretch;
  min-height: 260px;
  padding: 0;
  overflow: hidden;
}

.flow-copy {
  padding: 26px;
}

.gallery-collection {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  padding: 16px;
  background:
    linear-gradient(90deg, rgba(244, 217, 154, 0.08), transparent),
    rgba(244, 217, 154, 0.035);
}

.gallery-item {
  display: block;
  overflow: hidden;
  padding: 0;
  border: 1px solid rgba(244, 217, 154, 0.2);
  border-radius: 8px;
  background: #080604;
  cursor: zoom-in;
}

.gallery-item img {
  aspect-ratio: 1 / 1;
  height: 100%;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.gallery-item:hover img {
  transform: scale(1.04);
}

.compare-block ul,
.team-card ul {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
}

.compare-block li {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  gap: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.compare-block strong {
  color: var(--ink);
}

.compare-block.highlight {
  border-color: rgba(244, 217, 154, 0.42);
  background: linear-gradient(180deg, rgba(60, 42, 20, 0.92), rgba(18, 13, 8, 0.96));
}

.team-card {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  overflow: hidden;
}

.team-card img {
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  object-position: center top;
}

.team-card div {
  padding: 28px;
}

.role {
  margin-bottom: 8px;
  color: var(--gold-2) !important;
  font-weight: 800;
}

.team-card ul {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.team-card li {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--gold-2);
  font-size: 14px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.timeline li {
  position: relative;
  min-height: 190px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.045);
}

.timeline strong {
  display: block;
  margin: 12px 0 8px;
  color: var(--ink);
  font-size: 20px;
}

.contact-section {
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  background:
    linear-gradient(90deg, rgba(5, 4, 3, 0.96), rgba(25, 18, 11, 0.92)),
    url("assets/ai-zhichuang/image3.jpg") center / cover;
}

.contact-panel {
  background: rgba(8, 6, 4, 0.9);
}

.contact-phones {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.contact-phones a {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid rgba(240, 216, 150, 0.32);
  border-radius: 8px;
  color: var(--gold-2);
  font-size: 20px;
  font-weight: 900;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 56px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  background: #050403;
}

.footer p {
  margin-bottom: 0;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 34px;
  background: rgba(0, 0, 0, 0.84);
}

.lightbox[hidden] {
  display: none;
}

.lightbox img {
  max-width: min(94vw, 1080px);
  max-height: 88vh;
  object-fit: contain;
  border-radius: 8px;
}

.lightbox-nav {
  position: fixed;
  top: 50%;
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid rgba(244, 217, 154, 0.34);
  border-radius: 8px;
  color: var(--gold-2);
  background: rgba(5, 4, 3, 0.78);
  font-size: 34px;
  line-height: 1;
  cursor: pointer;
  transform: translateY(-50%);
}

.lightbox-prev {
  left: 18px;
}

.lightbox-next {
  right: 18px;
}

.lightbox-count {
  position: fixed;
  right: 24px;
  bottom: 20px;
  margin: 0;
  color: var(--gold-2);
  font-size: 14px;
  font-weight: 800;
}

.lightbox-close {
  position: fixed;
  top: 18px;
  right: 18px;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: var(--ink);
  background: rgba(5, 4, 3, 0.9);
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
}

.revealable {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
  transition-delay: var(--reveal-delay, 0ms);
}

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

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: minmax(210px, 1fr) auto auto;
    padding-right: 32px;
    padding-left: 32px;
  }

  .nav {
    gap: 14px;
  }

  .hero,
  .section {
    padding-right: 32px;
    padding-left: 32px;
  }

  .pillar-grid,
  .gallery-collection {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .avatar-section .feature-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .site-header {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    padding: 12px 20px;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
  }

  .site-header.nav-open .nav-toggle span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .site-header.nav-open .nav-toggle span:nth-child(2) {
    opacity: 0;
  }

  .site-header.nav-open .nav-toggle span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .nav {
    position: absolute;
    top: 100%;
    right: 16px;
    left: 16px;
    display: none;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(5, 4, 3, 0.98);
    box-shadow: var(--shadow);
  }

  .site-header.nav-open .nav {
    display: grid;
  }

  .nav a {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav a::after {
    display: none;
  }

  .header-call {
    display: none;
  }

  .brand small {
    max-width: 260px;
  }

  .hero {
    min-height: 70svh;
    padding: 54px 20px 42px;
  }

  .page-hero {
    min-height: 400px;
    padding: 54px 20px 42px;
  }

  .page-hero h1 {
    font-size: 44px;
  }

  .content-grid,
  .image-copy-grid,
  .contact-strip {
    grid-template-columns: 1fr;
  }

  .proof-grid {
    grid-template-columns: 1fr;
  }

  .contact-strip-actions {
    justify-content: flex-start;
  }

  .case-filters {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
  }

  .case-filters button {
    border-bottom: 1px solid var(--line);
  }

  h1 {
    font-size: 46px;
  }

  h2 {
    font-size: 32px;
  }

  .hero-lead {
    font-size: 22px;
  }

  .section {
    padding: 64px 20px;
  }

  .service-grid,
  .team-grid,
  .value-compare,
  .public-case-grid,
  .contact-section,
  .visual-flow {
    grid-template-columns: 1fr;
  }

  .flow-card-gallery {
    grid-template-columns: 1fr;
  }

  .team-card {
    grid-template-columns: 1fr;
  }

  .team-card img {
    min-height: 0;
    aspect-ratio: 4 / 5;
    height: auto;
    object-fit: contain;
    background: #080604;
  }

  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .brand-logo {
    width: 42px;
    height: 42px;
  }

  .page-hero h1 {
    font-size: 36px;
  }

  .contact-strip-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .case-filters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .brand strong {
    font-size: 16px;
  }

  .brand small {
    max-width: 210px;
    font-size: 11px;
  }

  .nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    min-height: auto;
    padding-top: 44px;
  }

  .intro-band {
    padding-top: 42px;
  }

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 28px;
  }

  h3 {
    font-size: 20px;
  }

  .hero-copy,
  .section-heading p:not(.eyebrow),
  .split-copy > p,
  .company-copy > p,
  .contact-copy > p {
    font-size: 16px;
  }

  .hero-actions,
  .contact-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .hero-stats,
  .pillar-grid,
  .system-grid,
  .feature-list,
  .public-case-metrics,
  .gallery-collection,
  .timeline {
    grid-template-columns: 1fr;
  }

  .gallery-collection {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 12px;
  }

  .lightbox-nav {
    top: auto;
    bottom: 18px;
    width: 44px;
    height: 44px;
    transform: none;
  }

  .lightbox-prev {
    left: 18px;
  }

  .lightbox-next {
    right: 78px;
  }

  .avatar-section .feature-list {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .hero-stats div {
    padding: 12px 8px;
  }

  .hero-stats dt {
    font-size: 22px;
  }

  .hero-stats dd {
    font-size: 0;
    white-space: nowrap;
  }

  .hero-stats dd::after {
    content: attr(data-mobile);
    font-size: 11px;
    line-height: 1.35;
  }

  .compare-block li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .team-card ul {
    grid-template-columns: 1fr;
  }

  .footer {
    display: grid;
    padding: 22px 20px;
  }
}

  /* ===== AI 培训栏目（黑金，复用官网变量） ===== */
  .course-hero {
    position: relative;
    display: block;
    min-height: auto;
    padding: 56px 56px 48px;
    border-bottom: none;
    background:
      radial-gradient(900px 460px at 82% 8%, rgba(244,217,154,0.16), transparent 60%),
      radial-gradient(720px 420px at 10% 90%, rgba(201,149,62,0.14), transparent 60%),
      linear-gradient(180deg, rgba(18,13,8,0.96), rgba(5,4,3,0.98));
  }
  .course-hero .eyebrow { letter-spacing: 2px; }
  .course-hero h1 { font-size: 64px; }
  .course-hero .hero-stats { margin-top: 18px; }
  .course-hero .hero-stats dd { font-size: 15px; white-space: normal; }
  .course-hero .hero-stats dd::after { content: none; }

  .tier-tabs {
    display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin: 6px 0 28px;
    position: relative; z-index: 2;
  }
  .tier-tab {
    display: flex; flex-direction: column; gap: 4px; align-items: flex-start;
    padding: 20px 22px; cursor: pointer; text-align: left;
    border: 1px solid var(--line); border-radius: 8px;
    background: linear-gradient(180deg, rgba(30,24,18,0.5), rgba(12,10,8,0.55));
    color: var(--muted); transition: all .25s ease;
    opacity: .52;
    position: relative; z-index: 2;
  }
  .tier-tab:hover { opacity: .78; }
  .tier-tab .t-name { font-size: 17px; font-weight: 850; color: inherit; }
  .tier-tab .t-sub { font-size: 13px; color: inherit; opacity: .82; }
  .tier-tab .t-price { margin-top: 6px; font-size: 15px; font-weight: 850; color: inherit; }
  .tier-tab.active {
    border-color: var(--gold-2);
    background: linear-gradient(180deg, rgba(244,217,154,0.14), rgba(201,149,62,0.08));
    box-shadow: 0 14px 36px rgba(0,0,0,0.34);
    color: var(--ink); opacity: 1;
  }
  .tier-tab.active .t-name { color: var(--ink); }
  .tier-tab.active .t-price { color: var(--gold-2); }

  .tier-panel { display: none; }
  .tier-panel.active { display: block; animation: fadeUp .5s ease; }
  .tier-body {
    border: 1px solid var(--line); border-radius: 8px;
    background: linear-gradient(180deg, rgba(30,24,18,0.94), rgba(12,10,8,0.96));
    box-shadow: var(--shadow);
    padding: 28px 30px;
  }
  @keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

  .tier-head {
    display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between;
    gap: 14px; margin-bottom: 6px;
  }
  .tier-title { font-size: 24px; font-weight: 860; color: var(--ink); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
  .tier-badge {
    font-size: 12px; font-weight: 750; padding: 3px 10px; border-radius: 100px;
    border: 1px solid rgba(244,217,154,0.28); background: rgba(244,217,154,0.08);
    color: var(--gold-2); vertical-align: middle;
  }
  .price-big { font-size: 30px; font-weight: 900; color: var(--gold-2); line-height: 1.1; }
  .price-big small { font-size: 14px; font-weight: 700; color: var(--muted); }
  .tier-sub { color: var(--muted); font-size: 15px; margin: 6px 0 16px; max-width: 720px; }

  .meta-row { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
  .meta-chip {
    padding: 7px 14px; border-radius: 8px; font-size: 13px; color: var(--text);
    border: 1px solid var(--line); background: rgba(255,255,255,0.04);
  }

  .mode-switch { display: inline-flex; gap: 0; border-radius: 8px;
    border: 1px solid var(--line); background: rgba(255,255,255,0.03); overflow: hidden; margin-bottom: 4px; }
  .mode-btn {
    position: relative; border: none; cursor: pointer;
    padding: 10px 24px; border-radius: 0;
    background: transparent; color: var(--muted); font-weight: 750; font-size: 14px;
    transition: all .25s ease; z-index: 1;
  }
  .mode-btn:hover { color: var(--text); background: rgba(255,255,255,0.04); }
  .mode-btn.active {
    color: var(--gold-2);
    box-shadow: inset 0 0 0 1px rgba(244,217,154,.22);
    background: linear-gradient(180deg, rgba(244,217,154,0.10), rgba(201,149,62,0.05));
  }
  .mode-hint { font-size: 13px; color: var(--muted); margin-bottom: 12px; min-height: 20px; }

  .accordion { display: grid; gap: 12px; margin-top: 8px; }
  .acc-item { border: 1px solid var(--line); border-radius: 8px;
    background: linear-gradient(180deg, rgba(30,24,18,0.94), rgba(12,10,8,0.96)); overflow: hidden; }
  .acc-head {
    display: flex; align-items: center; justify-content: space-between; gap: 14px;
    padding: 18px 22px; cursor: pointer; user-select: none;
  }
  .acc-head:hover { background: rgba(244,217,154,0.05); }
  .acc-week { display: flex; align-items: center; gap: 14px; min-width: 0; }
  .acc-tag {
    flex: 0 0 auto; display: inline-flex; align-items: center; justify-content: center;
    min-width: 64px; height: 30px; padding: 0 12px; border-radius: 8px;
    font-size: 13px; font-weight: 850; color: var(--gold-2);
    border: 1px solid rgba(244,217,154,0.28); background: rgba(244,217,154,0.07);
  }
  .acc-theme { font-size: 17px; font-weight: 800; color: var(--ink); }
  .acc-plus { flex: 0 0 auto; width: 22px; height: 22px; position: relative; transition: transform .3s ease; }
  .acc-plus::before, .acc-plus::after {
    content: ""; position: absolute; top: 50%; left: 50%; width: 14px; height: 2px;
    background: var(--gold-2); transform: translate(-50%,-50%);
  }
  .acc-plus::after { transform: translate(-50%,-50%) rotate(90deg); transition: transform .3s ease; }
  .acc-item.open .acc-plus::after { transform: translate(-50%,-50%) rotate(0deg); }
  .acc-body { max-height: 0; opacity: 0; overflow: hidden; transition: max-height .35s ease, opacity .35s ease; }
  .acc-item.open .acc-body { max-height: 320px; opacity: 1; }
  .acc-body-inner { padding: 0 22px 20px 100px; color: var(--muted); font-size: 15px; }
  .acc-item.open .acc-body.choose-body { max-height: 1600px; }
  @media (max-width: 640px){ .acc-body-inner { padding-left: 22px; } .acc-tag { min-width: 56px; } }

  .vip-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin: 8px 0 18px; }
  .vip-card {
    cursor: pointer; padding: 20px 22px; border-radius: 8px;
    border: 1px solid var(--line); text-align: center;
    background: linear-gradient(180deg, rgba(30,24,18,0.5), rgba(12,10,8,0.55));
    color: var(--muted); transition: all .25s ease; opacity: .52;
  }
  .vip-card:hover { opacity: .78; }
  .vip-card .v-dur { font-size: 16px; font-weight: 800; color: inherit; }
  .vip-card .v-total { margin-top: 8px; font-size: 22px; font-weight: 900; color: inherit; }
  .vip-card .v-month { font-size: 13px; color: inherit; opacity: .82; margin-top: 4px; }
  .vip-card.active {
    border-color: var(--gold-2); opacity: 1; color: var(--ink);
    box-shadow: 0 14px 36px rgba(0,0,0,0.34);
    background: linear-gradient(180deg, rgba(244,217,154,0.14), rgba(201,149,62,0.08));
  }
  .vip-card.active .v-total { color: var(--gold-2); }
  .vip-note { color: var(--muted); font-size: 14px; margin-top: 6px; }
  .vip-note b { color: var(--gold-2); }

  .compare-table { width: 100%; border-collapse: collapse; font-size: 15px; }
  .compare-table th, .compare-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
  .compare-table thead th { color: var(--gold-2); font-size: 14px; }
  .compare-table tbody th { color: var(--ink); font-weight: 700; white-space: nowrap; }
  .compare-table td { color: var(--text); }
  .compare-table[hidden] { display: none; }

  @media (max-width: 760px){
    .course-hero h1 { font-size: 42px; }
    .course-hero { padding: 36px 22px 28px; }
    .course-hero .hero-stats { margin-top: 12px; }
    .course-hero .hero-stats dd { font-size: 13px; }
    .tier-tabs { gap: 8px; }
    .tier-tab { padding: 14px 12px; }
    .tier-tab .t-name { font-size: 15px; }
    .tier-tab .t-sub { font-size: 12px; }
    .tier-tab .t-price { font-size: 13px; }
    .vip-grid { gap: 8px; }
    .vip-card { padding: 14px 10px; }
    .vip-card .v-dur { font-size: 14px; }
    .vip-card .v-total { font-size: 18px; }
    .vip-card .v-month { font-size: 12px; }
  }