:root {
  --ink: #172033;
  --muted: #5f6b7a;
  --line: #d8dee8;
  --blue: #1f6fd1;
  --green: #1d9a62;
  --teal: #0f766e;
  --paper: #f7f9fc;
  --panel: #ffffff;
  --dark: #111827;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #ffffff;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 42px;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  color: #384454;
  font-size: 15px;
}

nav a:hover {
  color: var(--blue);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.lang-switch button {
  min-width: 42px;
  height: 30px;
  border: 0;
  border-radius: 5px;
  color: var(--muted);
  background: transparent;
  font-weight: 800;
  cursor: pointer;
}

.lang-switch button:hover,
.lang-switch button.active {
  color: #ffffff;
  background: var(--blue);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 42px;
  align-items: center;
  min-height: calc(100vh - 68px);
  padding: 58px 5vw 42px;
  background: linear-gradient(180deg, #ffffff 0%, #f4f8fb 100%);
}

.hero-copy {
  max-width: 650px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 24px;
  font-size: 48px;
  line-height: 1.08;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

h2 {
  margin-bottom: 18px;
  font-size: 34px;
  line-height: 1.18;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  letter-spacing: 0;
}

.name-line {
  margin: -10px 0 22px;
  color: #1f6fd1;
  font-size: 22px;
  font-weight: 800;
}

.site-url {
  display: inline-flex;
  margin: 0 0 22px;
  padding: 8px 12px;
  color: #0f766e;
  background: #e9fbf4;
  border: 1px solid #bce8d5;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 800;
}

.lead {
  max-width: 590px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-weight: 700;
}

.button.primary {
  color: #ffffff;
  background: var(--blue);
  border-color: var(--blue);
}

.button.secondary {
  color: var(--ink);
  background: #ffffff;
}

.hero-visual {
  margin: 0;
}

.hero-visual img {
  display: block;
  width: 100%;
  max-height: 62vh;
  object-fit: contain;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 22px 60px rgba(30, 41, 59, 0.16);
}

figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.metrics div {
  min-height: 135px;
  padding: 30px 32px;
  border-right: 1px solid var(--line);
}

.metrics div:last-child {
  border-right: 0;
}

.metrics strong {
  display: block;
  margin-bottom: 10px;
  font-size: 22px;
}

.metrics span {
  color: var(--muted);
  line-height: 1.55;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 56px;
  align-items: center;
  padding: 92px 6vw;
}

.section-copy p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
  overflow-wrap: anywhere;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  line-height: 1.55;
}

.structure-panel {
  min-height: 0;
  padding: 40px;
  background: #f3f7fa;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.cable-section {
  position: relative;
  width: min(340px, 72vw);
  aspect-ratio: 1;
  margin: 10px auto 34px;
}

.ring {
  position: absolute;
  inset: 0;
  margin: auto;
  border-radius: 50%;
}

.ring.outer {
  width: 100%;
  height: 100%;
  background: var(--blue);
}

.ring.core {
  width: 72%;
  height: 72%;
  background: var(--green);
}

.ring.inner {
  width: 42%;
  height: 42%;
  background: var(--blue);
}

.ring.bore {
  width: 20%;
  height: 20%;
  background: #1f2937;
}

.legend {
  display: grid;
  gap: 12px;
  max-width: 370px;
  margin: 0 auto;
}

.legend span {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #334155;
}

.legend i {
  display: inline-block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
}

.blue {
  background: var(--blue);
}

.green {
  background: var(--green);
}

.dark {
  background: var(--dark);
}

.band,
.applications,
.investor-band,
.energy-band {
  padding: 88px 6vw;
}

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

.energy-band {
  color: #172033;
  background: #eef7f3;
  border-top: 1px solid #c8e4d5;
  border-bottom: 1px solid #c8e4d5;
}

.energy-band .section-heading p:not(.eyebrow) {
  max-width: 940px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.72;
}

.layout-visual {
  margin: 28px 0 30px;
}

.layout-visual img {
  display: block;
  width: 100%;
  max-height: 720px;
  object-fit: contain;
  background: #ffffff;
  border: 1px solid #c8e4d5;
  border-radius: 8px;
  box-shadow: 0 18px 44px rgba(18, 59, 47, 0.12);
}

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

.comparison-grid article {
  min-height: 0;
  padding: 28px;
  background: #ffffff;
  border: 1px solid #cbded4;
  border-radius: 8px;
}

.comparison-grid p {
  color: var(--muted);
  line-height: 1.65;
}

.highlight-card {
  border-color: #7ecaa5 !important;
  box-shadow: 0 18px 44px rgba(29, 154, 98, 0.14);
}

.saving-card {
  color: #ffffff;
  background: #123b2f !important;
  border-color: #123b2f !important;
}

.saving-card p {
  color: #d8f4e7;
}

.saving {
  display: block;
  margin-bottom: 14px;
  color: #80f0b8;
  font-size: 78px;
  line-height: 0.95;
  font-weight: 900;
}

.tag {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 7px 10px;
  border: 1px solid #bcd8ca;
  border-radius: 999px;
  color: #0f766e;
  background: #f4fbf8;
  font-size: 13px;
  font-weight: 800;
}

.parallel-mini {
  display: grid;
  grid-template-columns: 1fr 58px;
  gap: 14px;
  align-items: center;
  min-height: 108px;
  margin: 18px 0 20px;
}

.mini-lines {
  display: grid;
  gap: 9px;
}

.parallel-mini span {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 0;
  align-items: center;
}

.parallel-mini i {
  display: block;
  width: 58px;
  height: 34px;
  border: 2px solid #56677a;
  border-radius: 6px;
  background: linear-gradient(180deg, #eef2f7, #d7dee9);
}

.parallel-mini b {
  display: block;
  height: 6px;
  background: #56677a;
}

.parallel-mini em {
  display: block;
  width: 58px;
  height: 78px;
  border: 3px solid #56677a;
  border-radius: 10px;
  background: #f8fafc;
  position: relative;
}

.parallel-mini em::after {
  content: "";
  position: absolute;
  left: 22px;
  top: -26px;
  width: 9px;
  height: 26px;
  background: #56677a;
}

.parallel-mini.two i {
  border-color: var(--green);
  background: linear-gradient(180deg, #e9fbf1, #bfeacf);
}

.parallel-mini.two b,
.parallel-mini.two em::after {
  background: var(--green);
}

.parallel-mini.two em {
  border-color: var(--green);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 34px;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.value-grid article {
  min-height: 0;
  padding: 26px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.value-grid p,
.investor-band p,
.contact p {
  color: var(--muted);
  line-height: 1.68;
}

.app-table {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.8fr) minmax(0, 0.9fr);
  min-height: 72px;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.row:first-child {
  border-top: 0;
}

.row.head {
  min-height: 52px;
  color: #ffffff;
  background: #22324a;
  font-weight: 800;
}

.row span {
  display: flex;
  align-items: center;
  padding: 18px 22px;
  border-right: 1px solid var(--line);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

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

.licensing {
  background: #ffffff;
}

.licensing-steps {
  display: grid;
  gap: 14px;
}

.licensing-steps div {
  display: grid;
  grid-template-columns: 54px 150px 1fr;
  gap: 18px;
  align-items: start;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.licensing-steps span {
  color: var(--blue);
  font-size: 22px;
  font-weight: 900;
}

.licensing-steps strong {
  font-size: 18px;
}

.licensing-steps p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.investor-band {
  color: #ffffff;
  background: #17324d;
}

.investor-band .eyebrow,
.investor-band p {
  color: #bdebdc;
}

.investor-band h2 {
  max-width: 880px;
}

.investor-band p {
  max-width: 820px;
  font-size: 18px;
}

.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 78px 6vw;
  background: #ffffff;
  border-top: 1px solid var(--line);
}

.contact div {
  max-width: 790px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 42px;
  color: #f8fafc;
  background: #111827;
  font-size: 14px;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 22px;
  }

  nav {
    width: 100%;
    gap: 14px;
    padding-bottom: 4px;
  }

  .hero,
  .split-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 46px;
  }

  h1 {
    font-size: 38px;
  }

  h2 {
    font-size: 29px;
  }

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

  .layout-visual img {
    max-height: none;
  }

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

  .row span {
    border-right: 0;
    border-top: 1px solid var(--line);
  }

  .row span:first-child {
    border-top: 0;
  }

  .licensing-steps div {
    grid-template-columns: 1fr;
  }

  .contact,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
.hero,
.split-section,
.band,
.applications,
.investor-band,
.contact {
    padding-left: 22px;
    padding-right: 22px;
  }

  h1 {
    font-size: 30px;
    line-height: 1.15;
  }

  h2 {
    font-size: 25px;
  }

  .lead {
    font-size: 16px;
  }

  .metrics,
  .value-grid,
  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .metrics div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .metrics div:last-child {
    border-bottom: 0;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .site-header {
    gap: 14px;
  }

  .brand {
    font-size: 17px;
  }

  nav {
    font-size: 14px;
  }

  .lang-switch {
    align-self: stretch;
    justify-content: space-between;
  }

  .lang-switch button {
    flex: 1;
  }

  .hero-visual img,
  .layout-visual img {
    box-shadow: none;
  }

  .structure-panel {
    padding: 24px 18px;
  }

  .parallel-mini {
    grid-template-columns: 1fr 52px;
  }

  .parallel-mini span {
    grid-template-columns: 50px 1fr;
  }

  .parallel-mini i {
    width: 50px;
  }

  .parallel-mini em {
    width: 52px;
  }
}