:root {
  --ink: #12201d;
  --muted: #5d6f69;
  --line: #dbe7e2;
  --paper: #f7faf8;
  --white: #ffffff;
  --green: #0f7a64;
  --green-deep: #06483e;
  --teal: #1aa087;
  --gold: #c7a45a;
  --blue: #245a78;
  --aqua: #eef5f2;
  --shadow: 0 24px 70px rgba(14, 43, 38, 0.16);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  overflow-x: hidden;
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 4vw, 56px);
  color: var(--white);
  background: rgba(8, 41, 35, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(14px);
}

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

.brand-mark {
  display: grid;
  width: 54px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.92);
  padding: 4px;
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand strong,
.brand small {
  display: block;
  white-space: nowrap;
}

.brand strong {
  font-size: 16px;
  line-height: 1.2;
}

.brand small {
  margin-top: 2px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 12px;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
  color: rgba(255, 255, 255, 0.84);
  font-size: 14px;
}

.desktop-nav a:hover {
  color: var(--white);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  padding: 9px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--white);
}

.mobile-nav {
  position: fixed;
  top: 74px;
  left: 0;
  right: 0;
  z-index: 19;
  display: none;
  padding: 12px 20px 18px;
  background: rgba(8, 41, 35, 0.95);
  color: var(--white);
}

.mobile-nav a {
  display: block;
  padding: 12px 2px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.mobile-nav.open {
  display: block;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--white);
  background: var(--green-deep);
}

.hero-media,
.hero-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media img {
  object-fit: cover;
  object-position: center 42%;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(2, 25, 21, 0.9) 0%, rgba(2, 25, 21, 0.64) 46%, rgba(2, 25, 21, 0.18) 100%),
    linear-gradient(0deg, rgba(2, 25, 21, 0.86) 0%, rgba(2, 25, 21, 0.08) 58%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(760px, calc(100% - 40px));
  margin: 0 auto 148px clamp(20px, 7vw, 92px);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
  max-width: 100%;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(42px, 7vw, 86px);
  line-height: 1.05;
  font-weight: 800;
}

h1 span {
  display: block;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.16;
  font-weight: 760;
  overflow-wrap: anywhere;
  word-break: break-word;
}

main,
section,
.section-inner,
.intro-grid > *,
.feature-layout > *,
.split-grid > *,
.quality-layout > *,
.contact-grid > *,
.section-head {
  min-width: 0;
}

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

.hero-copy {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 18px;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 22px;
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
  border-radius: 0;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 34px rgba(11, 123, 105, 0.18);
}

.button.primary {
  color: var(--white);
  background: var(--green);
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.48);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: none;
}

.hero-metrics {
  position: absolute;
  left: clamp(20px, 7vw, 92px);
  right: clamp(20px, 7vw, 92px);
  bottom: 28px;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  background: transparent;
  box-shadow: none;
}

.hero-metrics div {
  padding: 20px 24px 4px 0;
  background: transparent;
}

.hero-metrics strong,
.stat-grid strong {
  display: block;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
}

.hero-metrics span {
  display: block;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.74);
}

.section,
.section-band,
.contact {
  position: relative;
  padding: clamp(70px, 10vw, 128px) clamp(20px, 4vw, 56px);
  overflow: hidden;
}

.section-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.section-logo {
  position: absolute;
  top: clamp(24px, 4vw, 44px);
  right: clamp(20px, 4vw, 56px);
  z-index: 0;
  width: clamp(86px, 12vw, 150px);
  max-width: 28vw;
  opacity: 0.1;
  pointer-events: none;
  user-select: none;
}

.section-band {
  background: var(--white);
}

.intro-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(28px, 6vw, 80px);
  align-items: start;
}

.intro-grid p:last-child {
  color: var(--muted);
  font-size: 18px;
}

.intro-highlights {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.intro-highlights article {
  padding: 22px 24px;
  background: linear-gradient(180deg, #ffffff 0%, #f3f8f6 100%);
  border: 1px solid var(--line);
  box-shadow: 0 14px 38px rgba(14, 43, 38, 0.08);
}

.intro-highlights strong {
  display: block;
  margin-bottom: 8px;
  color: var(--green-deep);
  font-size: 18px;
}

.intro-highlights span {
  color: var(--muted);
}

.history-section {
  background: #eef5f2;
}

.history-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: start;
}

.timeline-list {
  display: grid;
  gap: 0;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 18px 54px rgba(16, 65, 55, 0.08);
}

.timeline-list article {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 24px;
  padding: 24px;
  border-bottom: 1px solid var(--line);
}

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

.timeline-list time {
  color: var(--gold);
  font-weight: 800;
  line-height: 1.2;
}

.timeline-list h3,
.media-card h3 {
  font-size: 18px;
}

.timeline-list p,
.media-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.media-board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.media-card {
  min-height: 236px;
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 18px 48px rgba(16, 65, 55, 0.07);
}

.media-card span {
  margin-bottom: 20px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
}

.media-card a {
  width: max-content;
  margin-top: auto;
  padding-top: 18px;
  color: var(--green);
  font-weight: 800;
}

.media-card a::after {
  content: " →";
}

.section-head {
  max-width: 760px;
  margin-bottom: 42px;
}

.section-head p:last-child {
  color: var(--muted);
  font-size: 17px;
}

.feature-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(420px, 1.18fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
}

.feature-copy {
  display: grid;
  gap: 26px;
}

.feature-copy article {
  position: relative;
  padding-left: 58px;
}

.index,
.service-card span,
.process-grid span {
  color: var(--gold);
  font-weight: 800;
}

.feature-copy .index {
  position: absolute;
  left: 0;
  top: 2px;
  width: 38px;
  padding-top: 4px;
  border-top: 2px solid var(--gold);
}

.feature-copy p,
.service-card p,
.quality-list p,
.timeline span,
.process-grid p {
  color: var(--muted);
}

.image-panel {
  margin: 0;
  background: var(--white);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.image-panel img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
}

.image-panel figcaption {
  padding: 16px 20px;
  color: var(--muted);
  font-size: 14px;
}

.stats {
  padding-top: 52px;
  padding-bottom: 52px;
  background: var(--green-deep);
  color: var(--white);
}

.stats .section-logo,
.contact .section-logo {
  opacity: 0.18;
  filter: brightness(1.4);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-grid span {
  display: block;
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.72);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.service-card {
  min-height: 238px;
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 14px 42px rgba(16, 65, 55, 0.06);
}

.service-card span {
  display: block;
  margin-bottom: 34px;
}

.split-section {
  background: #edf5f2;
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: clamp(30px, 6vw, 76px);
  align-items: center;
}

.wide-image {
  margin: 0;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.wide-image img {
  width: 100%;
  aspect-ratio: 1.08 / 1;
  object-fit: cover;
}

.timeline {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.timeline div {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.timeline b {
  color: var(--green-deep);
}

.quality-layout {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  gap: clamp(28px, 5vw, 70px);
  align-items: start;
}

.ip-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: -12px 0 44px;
}

.ip-metrics div {
  padding: 22px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 12px 32px rgba(16, 65, 55, 0.06);
}

.ip-metrics strong {
  display: block;
  color: var(--green-deep);
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1;
}

.ip-metrics span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
}

.quality-list {
  display: grid;
  gap: 24px;
}

.quality-list div {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.credential-wall {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.credential-wall figure {
  margin: 0;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.credential-wall figure.wide {
  grid-column: span 2;
}

.credential-wall img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.credential-wall figure:nth-child(1) img,
.credential-wall figure:nth-child(2) img {
  object-fit: contain;
  padding: 18px;
  background: var(--white);
}

.credential-wall figcaption {
  padding: 12px 16px 14px;
  color: var(--muted);
  font-size: 14px;
}

.process {
  background: var(--white);
}

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

.process-grid article {
  padding: 26px;
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: 0 12px 30px rgba(16, 65, 55, 0.06);
}

.process-grid span {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  margin-bottom: 32px;
  border: 1px solid var(--green);
}

.contact {
  color: var(--white);
  background: linear-gradient(135deg, var(--green-deep), #123a50);
}

.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 6vw, 86px);
  align-items: start;
}

.contact p {
  color: rgba(255, 255, 255, 0.78);
  font-size: 17px;
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
}

.contact-form label:nth-child(4) {
  grid-column: 1 / -1;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: var(--white);
  background: rgba(0, 0, 0, 0.14);
  font: inherit;
}

.contact-form textarea {
  resize: vertical;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.52);
}

.contact-form option {
  color: var(--ink);
}

.contact-form .button {
  width: max-content;
  grid-column: 1 / -1;
}

.form-status {
  grid-column: 1 / -1;
  min-height: 22px;
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}

.site-footer {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 30px;
  padding: 34px clamp(20px, 4vw, 56px);
  color: rgba(255, 255, 255, 0.72);
  background: #071c18;
  font-size: 13px;
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer strong {
  color: var(--white);
  font-size: 16px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .desktop-nav {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .brand small {
    white-space: normal;
  }

  .hero-content {
    margin: 0 20px 176px;
    width: auto;
  }

  .hero-metrics,
  .intro-grid,
  .intro-highlights,
  .feature-layout,
  .history-layout,
  .split-grid,
  .quality-layout,
  .contact-grid,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .hero-metrics {
    left: 20px;
    right: 20px;
    gap: 1px;
  }

  .stat-grid,
  .service-grid,
  .media-board,
  .process-grid,
  .ip-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-layout,
  .split-grid {
    gap: 34px;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 12px 16px;
  }

  .brand-mark {
    width: 48px;
    height: 38px;
  }

  .brand strong {
    font-size: 14px;
  }

  .brand small {
    display: none;
  }

  .mobile-nav {
    top: 63px;
  }

  .hero {
    display: block;
    min-height: auto;
    padding: 96px 18px 42px;
  }

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

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(2, 25, 21, 0.88) 0%, rgba(2, 25, 21, 0.76) 58%, rgba(2, 25, 21, 0.94) 100%),
      linear-gradient(90deg, rgba(2, 25, 21, 0.9), rgba(2, 25, 21, 0.28));
  }

  .hero-content {
    width: auto;
    margin: 0 0 34px;
  }

  h1 {
    max-width: 100%;
    font-size: 31px;
    line-height: 1.12;
    overflow-wrap: anywhere;
    word-break: break-all;
  }

  h2 {
    font-size: 26px;
    line-height: 1.25;
    word-break: break-all;
  }

  .hero-copy,
  .intro-grid p:last-child,
  .section-head p:last-child,
  .contact p {
    font-size: 15px;
  }

  h2 {
    font-size: 30px;
  }

  .hero-metrics {
    position: relative;
    left: auto;
    right: auto;
    bottom: auto;
    grid-template-columns: 1fr;
    margin-top: 22px;
  }

  .hero-metrics div {
    padding: 16px 18px;
  }

  .hero-metrics strong {
    font-size: 28px;
  }

  .section,
  .section-band,
  .contact {
    padding: 62px 18px;
  }

  .section-logo {
    width: 78px;
    right: 14px;
    top: 18px;
    opacity: 0.08;
  }

  .stat-grid,
  .service-grid,
  .media-board,
  .process-grid,
  .credential-wall,
  .ip-metrics,
  .intro-highlights,
  .contact-form {
    grid-template-columns: 1fr;
  }

  .credential-wall figure.wide {
    grid-column: auto;
  }

  .contact-form label:nth-child(4),
  .contact-form .button,
  .form-status {
    grid-column: auto;
  }

  .timeline div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .timeline-list article {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 22px;
  }

  .credential-wall img {
    height: 260px;
  }
}