:root {
  --ink: #14202b;
  --muted-ink: #5e6d7c;
  --line: #d7dee5;
  --panel: #f4f7f9;
  --white: #ffffff;
  --accent: #e8b21b;
  --accent-dark: #b68200;
  --blue: #1d4f73;
  --steel: #6f7f8c;
  --shadow: 0 18px 50px rgba(20, 32, 43, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Noto Sans SC",
    Arial,
    sans-serif;
  line-height: 1.65;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 20;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(20px, 5vw, 72px);
  color: var(--white);
  transition:
    background 0.2s ease,
    box-shadow 0.2s ease,
    padding 0.2s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  padding-block: 12px;
  background: rgba(11, 23, 33, 0.94);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(14px);
}

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

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.38);
  background: rgba(255, 255, 255, 0.12);
  color: var(--accent);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  max-width: min(42vw, 360px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 16px;
}

.brand small {
  color: rgba(255, 255, 255, 0.7);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 34px);
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
}

.site-nav a {
  padding-block: 8px;
}

.site-nav a:hover {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.1);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--white);
}

.hero {
  position: relative;
  min-height: 92vh;
  overflow: hidden;
  color: var(--white);
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 22, 32, 0.88), rgba(8, 22, 32, 0.58) 43%, rgba(8, 22, 32, 0.16)),
    linear-gradient(180deg, rgba(0, 0, 0, 0.3), transparent 42%, rgba(0, 0, 0, 0.58));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(760px, calc(100% - 40px));
  padding: 22vh 0 190px clamp(20px, 7vw, 96px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(42px, 7vw, 86px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  margin-bottom: 34px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(16px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid transparent;
  font-weight: 700;
}

.primary-button {
  background: var(--accent);
  color: #111821;
}

.primary-button:hover {
  background: #f3c744;
}

.secondary-button {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
}

.secondary-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-stats {
  position: absolute;
  right: clamp(20px, 6vw, 80px);
  bottom: 34px;
  left: clamp(20px, 6vw, 80px);
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(10, 24, 35, 0.74);
  backdrop-filter: blur(14px);
}

.hero-stats article {
  min-width: 0;
  padding: 22px clamp(16px, 3vw, 34px);
  border-right: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-stats article:last-child {
  border-right: 0;
}

.hero-stats strong,
.hero-stats span {
  display: block;
}

.hero-stats strong {
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.15;
}

.hero-stats span {
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

.section {
  padding: clamp(68px, 9vw, 118px) clamp(20px, 6vw, 80px);
}

.muted {
  background: var(--panel);
}

.section-heading {
  width: min(860px, 100%);
  margin: 0 auto 42px;
  text-align: center;
}

.section-heading.left {
  margin: 0;
  text-align: left;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.3;
}

.intro-grid,
.feature-grid,
.timeline,
.split,
.contact-band,
.site-footer {
  width: min(1180px, 100%);
  margin-inline: auto;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  color: var(--muted-ink);
  font-size: 18px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-card {
  min-height: 280px;
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}

.feature-card span {
  display: inline-block;
  margin-bottom: 42px;
  color: var(--accent-dark);
  font-weight: 800;
}

.feature-card p,
.solution-list p,
.timeline p,
.contact-band p {
  color: var(--muted-ink);
}

.split {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) 1.18fr;
  gap: clamp(32px, 6vw, 78px);
  align-items: start;
}

.solution-list {
  display: grid;
  gap: 16px;
}

.solution-list article {
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

.solution-list article:last-child {
  border-bottom: 1px solid var(--line);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  background: var(--white);
}

.timeline article {
  min-height: 250px;
  padding: 28px;
  border-right: 1px solid var(--line);
}

.timeline article:last-child {
  border-right: 0;
}

.timeline span {
  display: grid;
  width: 40px;
  height: 40px;
  margin-bottom: 36px;
  place-items: center;
  background: var(--blue);
  color: var(--white);
  font-weight: 800;
}

.case-table {
  width: min(1180px, 100%);
  margin-inline: auto;
  overflow: hidden;
  border: 1px solid var(--line);
}

.case-table > div {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  min-height: 64px;
  border-bottom: 1px solid var(--line);
}

.case-table > div:last-child {
  border-bottom: 0;
}

.case-table span {
  display: flex;
  align-items: center;
  min-width: 0;
  padding: 16px 20px;
  border-right: 1px solid var(--line);
  overflow-wrap: anywhere;
}

.case-table span:last-child {
  border-right: 0;
}

.table-head {
  background: var(--ink);
  color: var(--white);
  font-weight: 700;
}

.contact-band {
  display: grid;
  grid-template-columns: 1fr minmax(280px, 390px);
  gap: 34px;
  align-items: center;
  margin-bottom: clamp(68px, 9vw, 112px);
  padding: clamp(34px, 6vw, 64px);
  background:
    linear-gradient(135deg, rgba(29, 79, 115, 0.96), rgba(20, 32, 43, 0.98)),
    var(--blue);
  color: var(--white);
}

.contact-band h2 {
  margin-bottom: 18px;
}

.contact-band p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.72);
}

.contact-card {
  display: grid;
  gap: 10px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  font-style: normal;
}

.contact-card strong {
  margin-bottom: 8px;
  font-size: 18px;
}

.contact-card span {
  color: rgba(255, 255, 255, 0.78);
  overflow-wrap: anywhere;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(20px, 6vw, 80px);
  border-top: 1px solid var(--line);
  color: var(--muted-ink);
  font-size: 14px;
}

@media (max-width: 980px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    background: rgba(11, 23, 33, 0.98);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 14px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .hero {
    min-height: 860px;
  }

  .hero-content {
    padding-top: 160px;
    padding-bottom: 250px;
  }

  .hero-stats,
  .feature-grid,
  .timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-stats article:nth-child(2),
  .timeline article:nth-child(2) {
    border-right: 0;
  }

  .hero-stats article:last-child {
    grid-column: 1 / -1;
    border-top: 1px solid rgba(255, 255, 255, 0.18);
  }

  .timeline article {
    border-bottom: 1px solid var(--line);
  }

  .timeline article:nth-child(3),
  .timeline article:nth-child(4) {
    border-bottom: 0;
  }

  .split,
  .contact-band,
  .intro-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .brand strong {
    max-width: 54vw;
    font-size: 14px;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: 900px;
  }

  .hero-content {
    width: calc(100% - 32px);
    padding-left: 16px;
    padding-top: 135px;
  }

  .hero-stats,
  .feature-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .hero-stats article,
  .hero-stats article:nth-child(2),
  .timeline article,
  .timeline article:nth-child(2) {
    border-right: 0;
  }

  .hero-stats article:not(:last-child) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .hero-stats article:last-child {
    border-top: 0;
  }

  .timeline article:nth-child(3) {
    border-bottom: 1px solid var(--line);
  }

  .case-table {
    border: 0;
  }

  .case-table > div {
    grid-template-columns: 1fr;
    margin-bottom: 14px;
    border: 1px solid var(--line);
  }

  .case-table span {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .case-table span:last-child {
    border-bottom: 0;
  }

  .table-head {
    display: none !important;
  }

  .site-footer {
    flex-direction: column;
  }
}