* {
  box-sizing: border-box;
}

:root {
  --ink: #17212b;
  --muted: #64707d;
  --paper: #fbfcf7;
  --cloud: #edf3ef;
  --line: #d9e2da;
  --green: #1c7c63;
  --green-dark: #0f5f4b;
  --coral: #e96f54;
  --sky: #7db9c8;
  --white: #fff;
  --shadow: 0 24px 70px rgba(30, 51, 65, .14);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
}

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

.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, 5vw, 72px);
  background: rgba(251, 252, 247, .86);
  border-bottom: 1px solid rgba(217, 226, 218, .8);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

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

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

.brand strong {
  font-size: 16px;
  letter-spacing: 2px;
}

.brand small {
  margin-top: -4px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 1.6px;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 34px);
}

.nav a {
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--green-dark);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 360px);
  align-items: end;
  gap: 38px;
  padding: 150px clamp(20px, 6vw, 88px) 56px;
  overflow: hidden;
  background:
    linear-gradient(112deg, rgba(251, 252, 247, .97) 0%, rgba(251, 252, 247, .76) 48%, rgba(237, 243, 239, .64) 100%),
    repeating-linear-gradient(90deg, rgba(28, 124, 99, .06) 0 1px, transparent 1px 86px),
    repeating-linear-gradient(0deg, rgba(125, 185, 200, .08) 0 1px, transparent 1px 86px);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.6px;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(42px, 7vw, 88px);
  line-height: .95;
  letter-spacing: 0;
}

.lead {
  max-width: 660px;
  color: #344351;
  font-size: clamp(16px, 1.7vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid var(--green);
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
}

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

.button.secondary {
  color: var(--green-dark);
  background: rgba(255, 255, 255, .62);
}

.hero-media {
  position: absolute;
  inset: 84px 0 0 35%;
  opacity: .84;
}

.route-map {
  position: relative;
  width: 100%;
  height: 100%;
}

.route-map svg {
  width: 100%;
  height: 100%;
  fill: none;
}

.route-map path {
  stroke: rgba(28, 124, 99, .28);
  stroke-width: 3;
  stroke-dasharray: 10 14;
}

.pin {
  position: absolute;
  width: 18px;
  height: 18px;
  background: var(--coral);
  border: 4px solid var(--white);
  border-radius: 50%;
  box-shadow: var(--shadow);
}

.pin-a { left: 16%; top: 68%; }
.pin-b { left: 52%; top: 46%; background: var(--green); }
.pin-c { left: 83%; top: 34%; background: var(--sky); }
.pin-d { left: 28%; top: 22%; background: var(--coral); }

.hero-panel {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 12px;
  align-self: center;
}

.hero-panel div {
  padding: 20px;
  background: rgba(255, 255, 255, .76);
  border: 1px solid rgba(217, 226, 218, .9);
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(30, 51, 65, .09);
}

.panel-label,
.hero-panel small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.hero-panel strong {
  display: block;
  color: var(--green-dark);
  font-size: 28px;
  line-height: 1.1;
}

.section,
.band,
.story,
.contact {
  padding: 86px clamp(20px, 6vw, 88px);
}

.section-head {
  max-width: 740px;
  margin-bottom: 36px;
}

.section-head h2,
.story h2,
.contact h2 {
  margin-bottom: 14px;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.15;
}

.section-head p:not(.eyebrow),
.story p,
.contact p {
  color: var(--muted);
}

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

.service-card {
  min-height: 270px;
  padding: 26px;
  background: var(--white);
}

.service-card span {
  color: var(--coral);
  font-weight: 800;
}

.service-card h3 {
  margin: 44px 0 12px;
  font-size: 19px;
}

.service-card p {
  color: var(--muted);
  font-size: 14px;
}

.band {
  background: var(--cloud);
}

.case-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 30px;
  align-items: stretch;
}

.case-tabs {
  display: grid;
  gap: 10px;
}

.case-tab {
  min-height: 52px;
  padding: 0 18px;
  color: var(--muted);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.case-tab.active {
  color: var(--white);
  background: var(--green);
  border-color: var(--green);
}

.case-display {
  min-height: 300px;
  padding: clamp(28px, 5vw, 58px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.case-kicker {
  color: var(--coral);
  font-weight: 800;
  letter-spacing: 2px;
}

.case-display h3 {
  margin-bottom: 16px;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.18;
}

.case-display p:last-child {
  max-width: 760px;
  color: var(--muted);
  font-size: 16px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(32px, 7vw, 90px);
  align-items: start;
}

.compact {
  margin-bottom: 0;
}

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

.standard-item {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.standard-item:last-child {
  border-bottom: 1px solid var(--line);
}

.standard-item strong {
  color: var(--green-dark);
}

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

.story {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 420px);
  gap: 40px;
  color: var(--white);
  background: #14231f;
}

.story .eyebrow,
.story h2 {
  color: var(--white);
}

.story p {
  color: rgba(255, 255, 255, .72);
  font-size: 16px;
}

.timeline {
  display: grid;
  gap: 1px;
  background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .14);
}

.timeline div {
  padding: 26px;
  background: rgba(255, 255, 255, .06);
}

.timeline span {
  display: block;
  color: #9bd1c0;
  font-weight: 800;
}

.timeline strong {
  display: block;
  margin-top: 8px;
  font-size: 16px;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: center;
  background: var(--white);
}

.contact-card {
  display: grid;
  justify-items: center;
  gap: 12px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.qr-image {
  display: block;
  width: 150px;
  height: 150px;
  object-fit: contain;
  background: #fff;
  border: 10px solid #fff;
  outline: 1px solid var(--line);
}

.contact-card a {
  color: var(--green-dark);
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px clamp(20px, 6vw, 88px);
  color: rgba(255, 255, 255, .62);
  background: #101917;
  font-size: 13px;
}

.video-layout {
  grid-template-columns: minmax(300px, .92fr) minmax(0, 1fr);
  align-items: start;
}

.video-stage {
  position: sticky;
  top: 92px;
  overflow: hidden;
  background: #101917;
  border: 1px solid rgba(16, 25, 23, .14);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.feature-video {
  display: block;
  width: 100%;
  aspect-ratio: 9 / 16;
  max-height: 72vh;
  background: #101917;
  object-fit: contain;
}

.video-play,
.mini-play {
  position: absolute;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  padding: 0;
  background: rgba(255, 255, 255, .88);
  border: 1px solid rgba(255, 255, 255, .58);
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 16px 36px rgba(16, 25, 23, .22);
}

.video-play {
  left: 18px;
  bottom: 18px;
}

.video-play span,
.mini-play::before {
  width: 0;
  height: 0;
  margin-left: 4px;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 16px solid var(--green);
  content: "";
}

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

.video-layout .case-display {
  min-height: 260px;
  margin-top: 18px;
}

.video-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-top: 44px;
}

.mini-video-card {
  position: relative;
  overflow: hidden;
  min-height: 240px;
  background: #101917;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.mini-video-card video {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  opacity: .76;
}

.mini-video-card.active video,
.mini-video-card:hover video {
  opacity: 1;
}

.mini-video-card strong {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 2;
  color: var(--white);
  font-size: 14px;
  line-height: 1.35;
  text-shadow: 0 2px 14px rgba(0, 0, 0, .5);
}

.mini-play {
  left: 12px;
  top: 12px;
  width: 44px;
  height: 44px;
}

.mini-play::before {
  border-top-width: 8px;
  border-bottom-width: 8px;
  border-left-width: 13px;
}

.story {
  grid-template-columns: minmax(280px, .72fr) minmax(0, 1fr);
}

.story-video-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.story-video-card {
  overflow: hidden;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 8px;
}

.story-video-card video {
  display: block;
  width: 100%;
  aspect-ratio: 9 / 16;
  max-height: 560px;
  background: #101917;
  object-fit: cover;
}

.story-video-card strong {
  display: block;
  padding: 14px;
  color: rgba(255, 255, 255, .88);
  font-size: 14px;
  line-height: 1.45;
}

@media (max-width: 900px) {
  .site-header {
    position: absolute;
    align-items: flex-start;
  }

  .nav {
    display: none;
  }

  .hero,
  .case-layout,
  .split,
  .story,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 128px;
  }

  .hero-panel {
    grid-template-columns: repeat(3, 1fr);
    align-self: auto;
  }

  .hero-panel strong {
    font-size: 24px;
  }

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

  .standard-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .video-stage {
    position: relative;
    top: auto;
  }

  .feature-video {
    aspect-ratio: 16 / 10;
    max-height: none;
  }

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

@media (max-width: 620px) {
  .hero-panel {
    grid-template-columns: 1fr;
  }

  .hero-media {
    inset: 90px -120px 0 0;
  }

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

  .service-card {
    min-height: 220px;
  }

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

  .case-tab {
    text-align: center;
    padding: 0 10px;
  }

  .footer {
    flex-direction: column;
  }

  .video-strip,
  .story-video-grid {
    grid-template-columns: 1fr;
  }

  .mini-video-card {
    min-height: auto;
  }

  .mini-video-card video,
  .story-video-card video {
    aspect-ratio: 16 / 10;
    object-fit: contain;
  }
}