:root {
  --ink: #111111;
  --muted: #66645e;
  --paper: #f7f4ec;
  --cream: #fffaf0;
  --white: #ffffff;
  --gold: #f6c600;
  --gold-deep: #c89400;
  --green: #0e5948;
  --line: rgba(17, 17, 17, 0.12);
  --shadow: 0 28px 80px rgba(29, 24, 8, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 94px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", ui-sans-serif,
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.68;
  text-rendering: geometricPrecision;
  word-break: normal;
  overflow-wrap: break-word;
}

body::selection {
  background: var(--gold);
  color: var(--ink);
}

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

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

.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 76px;
  padding: 14px clamp(18px, 4vw, 58px);
  border-bottom: 1px solid transparent;
  background: rgba(247, 244, 236, 0.8);
  backdrop-filter: blur(22px);
  transition:
    background 180ms ease,
    border-color 180ms ease;
}

.site-header[data-scrolled="true"] {
  border-color: var(--line);
  background: rgba(247, 244, 236, 0.96);
}

.brand,
.desktop-nav,
.header-actions,
.hero-actions,
.brand-values {
  display: flex;
  align-items: center;
}

.brand {
  flex: 0 0 auto;
  gap: 10px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.desktop-nav {
  gap: clamp(14px, 2vw, 28px);
  color: #3e3c36;
  font-size: 14px;
  font-weight: 650;
}

.desktop-nav a {
  position: relative;
  padding: 10px 0;
}

.desktop-nav a::after {
  position: absolute;
  right: 0;
  bottom: 4px;
  left: 0;
  height: 2px;
  background: var(--gold);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.desktop-nav a:hover::after {
  transform: scaleX(1);
}

.header-actions {
  flex: 0 0 auto;
  gap: 10px;
}

.lang-toggle,
.header-cta,
.primary-button,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 760;
  white-space: nowrap;
}

.lang-toggle {
  width: 48px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  cursor: pointer;
}

.header-cta {
  padding: 0 18px;
  background: var(--ink);
  color: var(--white);
}

.hero {
  position: relative;
  min-height: 86vh;
  overflow: hidden;
  background: var(--ink);
}

.hero-media,
.hero-media img,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.78), rgba(0, 0, 0, 0.32) 48%, rgba(0, 0, 0, 0.1)),
    linear-gradient(180deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.36));
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  padding: clamp(132px, 18vh, 188px) clamp(20px, 5vw, 72px) 170px;
  color: var(--white);
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1,
h2,
h3 {
  text-wrap: balance;
}

h1 {
  margin-bottom: 28px;
  font-size: clamp(42px, 6vw, 78px);
  line-height: 1.05;
  letter-spacing: 0;
  font-weight: 850;
}

.hero-lede {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.82;
}

.hero-actions {
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 36px;
}

.primary-button,
.ghost-button {
  padding: 0 24px;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease;
}

.primary-button {
  background: var(--gold);
  color: var(--ink);
  box-shadow: 0 16px 32px rgba(246, 198, 0, 0.22);
}

.ghost-button {
  border: 1px solid rgba(255, 255, 255, 0.38);
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
}

.primary-button:hover,
.ghost-button:hover {
  transform: translateY(-2px);
}

.hero-card {
  position: absolute;
  right: clamp(20px, 5vw, 72px);
  bottom: 54px;
  z-index: 3;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  width: min(430px, calc(100% - 40px));
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.hero-card img {
  width: 88px;
}

.hero-card span,
.quick-links span,
.feature-list span,
.scenario-card span,
.process-row span,
.cooperation-grid span {
  display: block;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
}

.hero-card strong {
  display: block;
  margin-top: 8px;
  line-height: 1.45;
}

.quick-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: clamp(28px, 4vw, 54px) clamp(20px, 5vw, 72px) 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--line);
  box-shadow: 0 22px 60px rgba(30, 24, 8, 0.12);
}

.quick-links a {
  min-height: 122px;
  padding: 22px 24px;
  background: rgba(255, 255, 255, 0.88);
  transition: background 160ms ease;
}

.quick-links a:hover {
  background: var(--cream);
}

.quick-links strong {
  display: block;
  margin-top: 12px;
  font-size: clamp(19px, 1.6vw, 23px);
  line-height: 1.34;
  font-weight: 820;
}

.section,
.platform-section,
.network-section,
.brand-section,
.cooperation {
  margin: 0 clamp(20px, 5vw, 72px);
  padding: clamp(70px, 10vw, 120px) 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(300px, 0.58fr);
  gap: clamp(28px, 6vw, 84px);
  margin-bottom: 42px;
}

.section-heading.compact {
  max-width: 960px;
  display: block;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(360px, 0.88fr) minmax(0, 1fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: center;
  margin-bottom: 34px;
}

.about-media {
  display: grid;
  grid-template-columns: 1fr 0.82fr;
  gap: 14px;
  align-items: stretch;
}

.about-media img {
  width: 100%;
  height: 210px;
  border-radius: 22px;
  object-fit: cover;
  box-shadow: 0 20px 54px rgba(30, 24, 8, 0.12);
}

.about-media .about-main {
  grid-row: span 2;
  height: 100%;
  min-height: 438px;
}

.about-copy p:not(.section-kicker) {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.78;
}

.about-copy h2 {
  margin-bottom: 24px;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.about-tags span {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  color: var(--green);
  font-size: 14px;
  font-weight: 780;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 4vw, 54px);
  line-height: 1.14;
  letter-spacing: 0;
  font-weight: 850;
}

.section-heading p:not(.section-kicker),
.about-copy p:not(.section-kicker),
.platform-copy > p,
.network-copy p,
.brand-copy p,
.cooperation .section-heading p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.78;
}

.metric-grid,
.cooperation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.metric-grid article,
.feature-list div,
.process-row div,
.cooperation-grid article {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.62);
}

.metric-grid article {
  min-height: 174px;
  padding: 28px 30px;
}

.metric-grid span {
  color: var(--gold-deep);
  font-size: 14px;
  font-weight: 800;
}

.metric-grid strong {
  display: block;
  margin: 24px 0 12px;
  font-size: 28px;
  line-height: 1.22;
}

.metric-grid p,
.feature-list p,
.scenario-card p,
.process-row p,
.cooperation-grid p,
.contact-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.platform-section {
  display: grid;
  grid-template-columns: minmax(320px, 0.72fr) minmax(0, 1fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: center;
  border-top: 1px solid var(--line);
}

.phone-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: end;
  padding: 26px;
  border-radius: 30px;
  background:
    radial-gradient(circle at 70% 8%, rgba(246, 198, 0, 0.36), transparent 30%),
    var(--white);
  box-shadow: var(--shadow);
}

.phone-panel img {
  width: 100%;
  border-radius: 22px;
  box-shadow: 0 20px 44px rgba(20, 18, 12, 0.16);
}

.phone-panel img:nth-child(2) {
  transform: translateY(28px);
}

.feature-list {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.feature-list div {
  padding: 22px 24px;
}

.feature-list p {
  margin-top: 10px;
}

.scenarios {
  border-top: 1px solid var(--line);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.scenario-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.66);
}

.scenario-card.large {
  grid-column: span 2;
}

.scenario-card img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.scenario-card.large img {
  height: 380px;
}

.scenario-card div {
  padding: 24px;
}

h3 {
  margin: 10px 0 12px;
  font-size: 24px;
  line-height: 1.28;
  font-weight: 830;
}

.network-section {
  border-top: 1px solid var(--line);
}

.network-copy {
  max-width: 940px;
  margin-bottom: 36px;
}

.network-copy p {
  max-width: 760px;
  margin-top: 20px;
}

.network-gallery {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 0.9fr;
  gap: 16px;
}

.network-gallery img {
  width: 100%;
  height: 420px;
  border-radius: 24px;
  object-fit: cover;
  box-shadow: 0 22px 58px rgba(30, 24, 8, 0.12);
}

.network-gallery img:nth-child(2),
.network-gallery img:nth-child(3) {
  height: 330px;
  align-self: end;
}

.process-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.process-row div {
  min-height: 132px;
  padding: 22px 24px;
}

.process-row p {
  margin-top: 10px;
}

.brand-section {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 0.78fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: center;
  border-top: 1px solid var(--line);
}

.brand-images {
  display: grid;
  gap: 16px;
}

.brand-images img {
  width: 100%;
  border-radius: 24px;
  object-fit: cover;
  box-shadow: 0 20px 54px rgba(30, 24, 8, 0.12);
}

.brand-values {
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.brand-values span {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  font-weight: 780;
}

.cooperation {
  border-top: 1px solid var(--line);
}

.cooperation-grid article {
  min-height: 164px;
  padding: 26px 28px;
}

.cooperation-grid p {
  margin-top: 12px;
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(500px, 0.62fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  margin-top: 22px;
  padding: clamp(34px, 5vw, 58px);
  overflow: hidden;
  border-radius: 30px;
  background:
    radial-gradient(circle at 92% 16%, rgba(246, 198, 0, 0.28), transparent 28%),
    linear-gradient(135deg, #111111, #17130a);
  color: var(--white);
  box-shadow: 0 28px 72px rgba(20, 16, 6, 0.18);
}

.contact-copy {
  max-width: 820px;
}

.contact-badge {
  display: inline-flex;
  margin-bottom: 22px;
  padding: 8px 12px;
  border: 1px solid rgba(246, 198, 0, 0.34);
  border-radius: 999px;
  background: rgba(246, 198, 0, 0.12);
  color: var(--gold);
  font-size: 13px;
  font-weight: 820;
}

.contact-card strong {
  display: block;
  max-width: 740px;
  font-size: clamp(24px, 2.8vw, 38px);
  line-height: 1.22;
  font-weight: 850;
}

.contact-card p {
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.72);
}

.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: stretch;
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  box-shadow: 0 20px 54px rgba(0, 0, 0, 0.24);
}

.email-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: 22px;
  border-radius: 18px;
  background: var(--gold);
  color: var(--ink);
}

.email-card span {
  margin-bottom: 10px;
  color: rgba(17, 17, 17, 0.62);
  font-size: 13px;
  font-weight: 820;
}

.email-card strong {
  max-width: none;
  font-size: clamp(18px, 1.6vw, 23px);
  line-height: 1.24;
  word-break: break-all;
}

.qr-card {
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 12px;
  border: 1px solid rgba(17, 17, 17, 0.1);
  border-radius: 18px;
  background: var(--white);
}

.qr-card img {
  width: 118px;
  height: 118px;
  border-radius: 10px;
  object-fit: cover;
  background: var(--white);
}

.qr-card span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 760;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 5vw, 72px) 42px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 1100px) {
  .desktop-nav {
    display: none;
  }

  .quick-links,
  .metric-grid,
  .process-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-heading,
  .about-layout,
  .platform-section,
  .brand-section {
    grid-template-columns: 1fr;
  }

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

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

  .network-gallery img:first-child {
    grid-column: span 2;
  }

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

  .contact-panel {
    max-width: 620px;
  }
}

@media (max-width: 720px) {
  html {
    scroll-padding-top: 76px;
  }

  .site-header {
    min-height: 66px;
    padding: 12px 16px;
  }

  .brand span,
  .header-cta {
    display: none;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .hero {
    min-height: 840px;
  }

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(0, 0, 0, 0.74), rgba(0, 0, 0, 0.28) 60%, rgba(0, 0, 0, 0.55)),
      linear-gradient(90deg, rgba(0, 0, 0, 0.42), rgba(0, 0, 0, 0.12));
  }

  .hero-content {
    padding: 106px 18px 260px;
  }

  h1 {
    font-size: 42px;
  }

  h2 {
    font-size: 32px;
  }

  .hero-lede,
  .section-heading p:not(.section-kicker),
  .platform-copy > p,
  .network-copy p,
  .brand-copy p,
  .cooperation .section-heading p {
    font-size: 16px;
  }

  .hero-card {
    right: 18px;
    bottom: 28px;
    left: 18px;
    width: auto;
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .hero-card img {
    width: 72px;
  }

  .quick-links,
  .about-media,
  .metric-grid,
  .scenario-grid,
  .network-gallery,
  .process-row,
  .cooperation-grid,
  .phone-panel {
    grid-template-columns: 1fr;
  }

  .quick-links {
    margin: 24px 18px 0;
  }

  .about-layout {
    gap: 30px;
  }

  .about-media .about-main,
  .about-media img {
    min-height: 0;
    height: 260px;
  }

  .section,
  .platform-section,
  .network-section,
  .brand-section,
  .cooperation {
    margin-right: 18px;
    margin-left: 18px;
    padding: 68px 0;
  }

  .scenario-card.large,
  .network-gallery img:first-child {
    grid-column: auto;
  }

  .scenario-card img,
  .scenario-card.large img,
  .network-gallery img,
  .network-gallery img:nth-child(2),
  .network-gallery img:nth-child(3) {
    height: 260px;
  }

  .phone-panel {
    padding: 18px;
  }

  .phone-panel img:nth-child(2) {
    transform: none;
  }

  .contact-card {
    display: grid;
    grid-template-columns: 1fr;
    padding: 30px 20px;
    border-radius: 24px;
  }

  .contact-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 0;
    padding: 12px;
  }

  .email-card {
    padding: 18px;
  }

  .email-card strong {
    font-size: 18px;
  }

  .qr-card img {
    width: 148px;
    height: 148px;
  }

  .site-footer {
    display: block;
  }

  .site-footer span {
    display: block;
    margin-bottom: 8px;
  }
}