:root {
  color-scheme: light;
  --ink: #17202a;
  --ink-soft: #4e5a65;
  --paper: #f7f5ef;
  --surface: #ffffff;
  --line: #d7dce0;
  --steel: #2f6173;
  --forest: #2f6f4e;
  --amber: #c88a2c;
  --rust: #9a4d35;
  --shadow: 0 20px 50px rgba(23, 32, 42, 0.13);
  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);
  font-size: 16px;
  line-height: 1.7;
}

body.detail-open .site-header {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 30px rgba(23, 32, 42, 0.08);
  backdrop-filter: blur(14px);
}

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

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

button {
  font: inherit;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 4vw, 56px);
  color: #fff;
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.site-header.is-solid {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 30px rgba(23, 32, 42, 0.08);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 170px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.2;
}

.brand small {
  margin-top: 3px;
  font-size: 12px;
  opacity: 0.78;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  min-width: 58px;
  padding: 8px 12px;
  border-radius: 999px;
  text-align: center;
  font-size: 14px;
  transition:
    background 160ms ease,
    color 160ms ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  background: rgba(255, 255, 255, 0.18);
}

.is-solid .site-nav a:hover,
.is-solid .site-nav a.is-active {
  color: #fff;
  background: var(--steel);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: inherit;
  background: transparent;
}

.menu-button span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #fff;
}

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

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

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(11, 22, 30, 0.88), rgba(11, 22, 30, 0.54) 48%, rgba(11, 22, 30, 0.2)),
    linear-gradient(0deg, rgba(11, 22, 30, 0.82), rgba(11, 22, 30, 0.06) 52%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(720px, calc(100% - 36px));
  margin: 0 0 clamp(84px, 14vh, 150px) clamp(18px, 8vw, 108px);
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(60px, 12vw, 148px);
  line-height: 0.92;
  letter-spacing: 0;
}

.hero-lead {
  margin: 24px 0 0;
  font-size: clamp(24px, 3vw, 42px);
  line-height: 1.2;
  font-weight: 700;
}

.hero-copy {
  max-width: 660px;
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(17px, 1.5vw, 21px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
  line-height: 1.2;
  transition:
    transform 160ms ease,
    background 160ms ease,
    border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: var(--ink);
  background: #fff;
}

.button-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.58);
  background: rgba(255, 255, 255, 0.08);
}

.button-dark {
  color: #fff;
  background: var(--steel);
}

.button-disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.button-disabled:hover {
  transform: none;
}

.hero-proof {
  position: absolute;
  right: clamp(18px, 5vw, 72px);
  bottom: 28px;
  z-index: 2;
  display: flex;
  max-width: min(620px, calc(100% - 36px));
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.hero-proof span {
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 999px;
  background: rgba(8, 18, 24, 0.32);
  font-size: 13px;
}

.section {
  padding: clamp(64px, 9vw, 116px) clamp(18px, 5vw, 72px);
}

.section-grid,
.split-section,
.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(30px, 6vw, 80px);
  align-items: start;
}

h2 {
  margin: 0;
  font-size: clamp(32px, 4.8vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 20px;
  line-height: 1.35;
}

p {
  margin: 0;
}

.intro-band,
.review-band {
  background: var(--surface);
}

.intro-copy {
  display: grid;
  gap: 18px;
  color: var(--ink-soft);
  font-size: 18px;
}

.stats-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  padding-top: 0;
  padding-bottom: 0;
  background: var(--line);
}

.stat {
  min-height: 150px;
  padding: 32px clamp(18px, 3vw, 34px);
  background: #edf2f1;
}

.stat strong,
.stat span {
  display: block;
}

.stat strong {
  margin-bottom: 10px;
  font-size: 23px;
}

.stat span {
  color: var(--ink-soft);
}

.section-heading {
  max-width: 840px;
  margin-bottom: 34px;
}

.section-heading p:last-child {
  margin-top: 16px;
  color: var(--ink-soft);
  font-size: 18px;
}

.section-heading.compact {
  margin-bottom: 28px;
}

.route-band {
  background: #eef1ec;
}

.route-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.route-grid div {
  min-height: 188px;
  padding: 26px;
  background: var(--surface);
}

.route-grid span {
  display: block;
  margin-bottom: 24px;
  color: var(--rust);
  font-weight: 900;
}

.route-grid strong {
  display: block;
  margin-bottom: 8px;
  font-size: 21px;
}

.route-grid p {
  color: var(--ink-soft);
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.capability-card,
.case-card,
.method-steps article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.capability-card {
  min-height: 232px;
  padding: 26px;
}

.action-card {
  display: block;
  width: 100%;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition:
    transform 200ms ease,
    box-shadow 200ms ease,
    border-color 200ms ease,
    background 200ms ease;
}

.action-card:hover {
  border-color: rgba(47, 97, 115, 0.45);
  background: #fbfcfb;
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.action-card small {
  display: inline-flex;
  margin-top: 22px;
  color: var(--steel);
  font-size: 13px;
  font-weight: 900;
}

.card-index {
  display: inline-block;
  margin-bottom: 36px;
  color: var(--rust);
  font-weight: 900;
}

.capability-card p,
.method-steps p,
.case-body p,
.muted {
  color: var(--ink-soft);
}

.capability-card p {
  margin-top: 14px;
}

.method-band {
  color: #fff;
  background: var(--steel);
}

.method-band .section-kicker {
  color: #f2c66e;
}

.method-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.method-steps article {
  min-height: 190px;
  padding: 24px;
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
}

.method-steps span {
  display: block;
  margin-bottom: 30px;
  color: #f2c66e;
  font-weight: 900;
}

.method-steps p {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.78);
}

.split-section {
  align-items: center;
  background: #eef1ec;
}

.split-media {
  overflow: hidden;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.split-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.split-content {
  max-width: 720px;
}

.split-content .muted {
  margin-top: 18px;
}

.timeline {
  display: grid;
  gap: 18px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.timeline-link {
  display: grid;
  width: 100%;
  grid-template-columns: 120px 1fr;
  gap: 18px;
  padding: 0;
  color: inherit;
  text-align: left;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.timeline-link span {
  color: var(--ink-soft);
}

.timeline-link:hover span {
  color: var(--ink);
}

.timeline time {
  color: var(--rust);
  font-weight: 900;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.case-card {
  overflow: hidden;
}

.image-button {
  width: 100%;
  padding: 0;
  border: 0;
  background: #dfe6e5;
  cursor: zoom-in;
}

.image-button img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 220ms ease;
}

.image-button:hover img {
  transform: scale(1.025);
}

.case-body {
  padding: 22px;
}

.case-body h3 {
  margin-top: 10px;
}

.case-body p {
  margin-top: 10px;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 9px;
  border-radius: 999px;
  color: var(--forest);
  background: #e5f0e9;
  font-size: 12px;
  font-weight: 900;
}

.review-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.review-list div {
  min-height: 156px;
  padding: 26px;
  background: #fafafa;
}

.review-list strong,
.review-list span {
  display: block;
}

.review-list strong {
  margin-bottom: 12px;
  font-size: 20px;
}

.review-list span {
  color: var(--ink-soft);
}

.contact-section {
  align-items: center;
  color: #fff;
  background: var(--ink);
}

.contact-section .section-kicker {
  color: #f2c66e;
}

.contact-section p {
  max-width: 760px;
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
}

.contact-panel {
  justify-self: end;
  width: min(100%, 430px);
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.contact-panel p {
  margin: 0 0 20px;
  font-size: 16px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 22px clamp(18px, 5vw, 72px);
  color: #fff;
  background: #0c1116;
  font-size: 14px;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 28px;
  background: rgba(6, 10, 13, 0.88);
}

.lightbox[hidden] {
  display: none;
}

.lightbox img {
  max-height: 88vh;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.lightbox-close {
  position: fixed;
  top: 18px;
  right: 22px;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 50%;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
}

.home-view {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
  transition:
    opacity 260ms ease,
    transform 260ms ease,
    filter 260ms ease;
}

.home-view.is-leaving {
  opacity: 0;
  transform: translateY(18px) scale(0.99);
  filter: blur(4px);
}

.detail-shell {
  min-height: 100vh;
  padding: 104px clamp(18px, 5vw, 72px) clamp(64px, 8vw, 104px);
  background:
    linear-gradient(135deg, rgba(47, 97, 115, 0.12), transparent 38%),
    var(--paper);
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 300ms ease,
    transform 300ms ease;
}

.detail-shell[hidden] {
  display: none;
}

.detail-shell.is-active {
  opacity: 1;
  transform: translateY(0);
}

.detail-topbar {
  position: sticky;
  top: 82px;
  z-index: 10;
  display: flex;
  width: min(1240px, 100%);
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 0 auto 22px;
  padding: 12px;
  border: 1px solid rgba(23, 32, 42, 0.08);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 12px 35px rgba(23, 32, 42, 0.08);
  backdrop-filter: blur(12px);
}

.detail-topbar span {
  color: var(--ink-soft);
  font-size: 14px;
}

.back-button {
  min-height: 42px;
  padding: 9px 14px;
  color: #fff;
  border: 0;
  border-radius: 6px;
  background: var(--steel);
  font-weight: 900;
  cursor: pointer;
}

.detail-page {
  display: none;
  width: min(1240px, 100%);
  margin: 0 auto;
}

.detail-page.is-active {
  display: block;
  animation: detailIn 360ms ease both;
}

@keyframes detailIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.75fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
  padding: clamp(28px, 5vw, 54px);
  border: 1px solid rgba(23, 32, 42, 0.08);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.detail-hero.detail-plain {
  grid-template-columns: 1fr;
}

.detail-hero h2 {
  max-width: 760px;
}

.detail-hero p:last-child {
  max-width: 720px;
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 18px;
}

.detail-hero img {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 8px;
  object-fit: cover;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.detail-grid div {
  min-height: 180px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.detail-grid p {
  margin-top: 10px;
  color: var(--ink-soft);
}

@media (max-width: 980px) {
  .section-grid,
  .split-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .stats-band,
  .capability-grid,
  .method-steps,
  .case-grid,
  .review-list,
  .route-grid,
  .detail-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-panel {
    justify-self: start;
  }

  .detail-hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 15px;
  }

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

  .menu-button {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 70px;
    right: 16px;
    display: none;
    width: min(260px, calc(100vw - 32px));
    padding: 10px;
    border: 1px solid rgba(23, 32, 42, 0.1);
    border-radius: 8px;
    color: var(--ink);
    background: #fff;
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: grid;
    gap: 4px;
  }

  .site-nav a {
    width: 100%;
    border-radius: 6px;
    text-align: left;
  }

  .site-nav a:hover,
  .site-nav a.is-active,
  .is-solid .site-nav a:hover,
  .is-solid .site-nav a.is-active {
    color: #fff;
    background: var(--steel);
  }

  .hero {
    min-height: 88vh;
  }

  .hero-overlay {
    background:
      linear-gradient(0deg, rgba(11, 22, 30, 0.9), rgba(11, 22, 30, 0.42)),
      rgba(11, 22, 30, 0.18);
  }

  .hero-content {
    width: calc(100% - 32px);
    margin: 0 16px 126px;
  }

  .hero-copy {
    max-width: 100%;
  }

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

  .hero-proof {
    right: 16px;
    left: 16px;
    bottom: 22px;
    justify-content: flex-start;
  }

  .section {
    padding: 56px 16px;
  }

  .stats-band,
  .capability-grid,
  .method-steps,
  .case-grid,
  .review-list,
  .route-grid,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .stat,
  .capability-card,
  .method-steps article,
  .review-list div,
  .route-grid div,
  .detail-grid div {
    min-height: auto;
  }

  .timeline-link {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .detail-shell {
    padding: 88px 16px 56px;
  }

  .detail-topbar {
    top: 70px;
    display: grid;
  }

  .detail-hero {
    padding: 22px;
  }

  .site-footer {
    display: grid;
  }
}