:root {
  --ink: #141414;
  --text: #242424;
  --muted: #686868;
  --line: #e4e6e8;
  --surface: #ffffff;
  --wash: #f6f8fa;
  --deep: #101417;
  --accent: #0d97bc;
  --accent-dark: #09637f;
  --hot: #d95d2a;
  --gold: #d39116;
  --white: #ffffff;
  --shadow: 0 24px 64px rgba(16, 20, 23, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.65;
}

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

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

.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  height: 72px;
  padding: 0 clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.84);
  border-bottom: 1px solid rgba(228, 230, 232, 0.76);
  backdrop-filter: blur(18px);
  transition: box-shadow 180ms ease, background 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 28px rgba(16, 20, 23, 0.09);
}

.brand {
  display: flex;
  align-items: center;
  width: 150px;
  height: 44px;
}

.brand img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left center;
}

.nav {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 3vw, 34px);
  color: var(--muted);
  font-size: 14px;
}

.nav a {
  transition: color 150ms ease;
}

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

.header-action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 750;
  white-space: nowrap;
}

.header-action,
.button.primary {
  background: var(--ink);
  color: var(--white);
}

.hero .button.primary {
  background: var(--white);
  color: var(--deep);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.22);
}

.button.secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(20, 20, 20, 0.18);
}

.hero .button.secondary {
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.38);
  backdrop-filter: blur(12px);
}

.hero {
  position: relative;
  min-height: 94svh;
  padding: 120px clamp(20px, 5vw, 72px) 52px;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero::after {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(90deg, rgba(8, 16, 22, 0.92) 0%, rgba(8, 16, 22, 0.78) 36%, rgba(8, 16, 22, 0.28) 70%, rgba(8, 16, 22, 0.08) 100%),
    linear-gradient(180deg, rgba(8, 16, 22, 0.2) 0%, rgba(8, 16, 22, 0) 54%, rgba(8, 16, 22, 0.84) 100%);
  pointer-events: none;
}

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

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding-top: 28px;
}

.hero .eyebrow {
  color: #76d4ed;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 16px;
  color: var(--ink);
  font-size: clamp(58px, 11vw, 132px);
  line-height: 0.9;
  letter-spacing: 0;
}

.hero h1 {
  color: #f7fbfd;
  text-shadow: 0 20px 58px rgba(0, 0, 0, 0.34);
}

h2 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: 0;
}

.balanced-title {
  max-width: 980px;
}

.balanced-title span {
  display: block;
}

h3 {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-subtitle {
  max-width: 600px;
  color: rgba(247, 251, 253, 0.86);
  font-size: clamp(19px, 2.6vw, 28px);
  line-height: 1.42;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-facts {
  position: absolute;
  right: clamp(20px, 5vw, 72px);
  bottom: 46px;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(130px, 1fr));
  width: min(560px, calc(100% - 40px));
  margin-bottom: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(10, 20, 26, 0.72);
  box-shadow: 0 22px 58px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(16px);
}

.hero-facts div {
  min-width: 0;
  padding: 18px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
}

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

.hero-facts dt {
  color: rgba(255, 255, 255, 0.58);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero-facts dd {
  margin-bottom: 0;
  color: var(--white);
  font-size: 15px;
  font-weight: 800;
}

.official-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.official-strip div {
  min-height: 110px;
  padding: 24px clamp(20px, 4vw, 48px);
  background: var(--surface);
}

.official-strip strong,
.official-strip span {
  display: block;
}

.official-strip strong {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 14px;
}

.official-strip span {
  color: var(--muted);
  font-size: 15px;
}

.section,
.series,
.buy-section {
  padding: clamp(70px, 10vw, 126px) clamp(20px, 5vw, 72px);
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(36px, 5vw, 72px);
  align-items: center;
}

.section-copy p,
.section-heading p {
  max-width: 780px;
  color: var(--muted);
  font-size: 17px;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 30px;
}

.spec-grid div,
.feature-list article,
.series-grid article,
.qr-panel,
.faq details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.spec-grid div {
  padding: 18px;
}

.spec-grid span,
.channel-list span,
.site-footer span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.spec-grid strong,
.channel-list strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-size: 16px;
}

.image-panel {
  overflow: hidden;
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.image-panel img {
  width: 100%;
  min-height: 420px;
  object-fit: cover;
  object-position: right center;
}

.series {
  background: var(--wash);
}

.section-heading {
  max-width: 880px;
  margin-bottom: 34px;
}

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

.series-grid article {
  overflow: hidden;
}

.series-grid img {
  width: 100%;
  aspect-ratio: 1.18;
  object-fit: cover;
  object-position: center top;
  background: #f2f2f2;
  border-bottom: 1px solid var(--line);
}

.series-grid article > div {
  padding: 24px;
}

.tag {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 850;
  text-transform: uppercase;
}

.series-grid p,
.feature-list p,
.dealer-grid p,
.buy-copy p,
.faq p {
  color: var(--muted);
}

.standard,
.service {
  background: var(--surface);
}

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

.feature-list article {
  min-height: 260px;
  padding: 24px;
  background: linear-gradient(180deg, #ffffff 0%, #f9fbfc 100%);
}

.feature-index {
  display: block;
  margin-bottom: 52px;
  color: var(--hot);
  font-size: 14px;
  font-weight: 850;
}

.dealer-section {
  background: var(--wash);
}

.dealer-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.dealer-grid article {
  min-height: 250px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.dealer-grid span {
  display: block;
  margin-bottom: 46px;
  color: var(--gold);
  font-size: 14px;
  font-weight: 850;
}

.buy-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: clamp(26px, 5vw, 64px);
  align-items: center;
  background:
    linear-gradient(120deg, rgba(13, 151, 188, 0.18), rgba(217, 93, 42, 0.12)),
    var(--deep);
  color: var(--white);
}

.buy-copy {
  max-width: 780px;
}

.buy-copy .eyebrow {
  color: #8ddbf0;
}

.buy-copy h2 {
  color: var(--white);
}

.buy-copy p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.76);
}

.channel-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.channel-list div {
  padding: 18px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.channel-list strong {
  color: var(--white);
}

.channel-list span {
  color: rgba(255, 255, 255, 0.68);
}

.qr-panel {
  padding: 24px;
  color: var(--ink);
  text-align: center;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.22);
}

.qr-panel img {
  width: 100%;
  max-width: 250px;
  margin: 0 auto 16px;
  border-radius: 6px;
}

.qr-panel p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.faq {
  display: grid;
  gap: 12px;
}

.faq details {
  padding: 20px 22px;
  background: var(--wash);
}

.faq summary {
  cursor: pointer;
  color: var(--ink);
  font-size: 18px;
  font-weight: 850;
}

.faq p {
  margin: 14px 0 0;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 32px clamp(20px, 5vw, 72px);
  background: #0d0f10;
  color: var(--white);
}

.site-footer strong {
  display: block;
  margin-bottom: 4px;
}

.site-footer > div:last-child {
  text-align: right;
}

@media (max-width: 1100px) {
  .hero {
    align-items: flex-start;
  }

  .hero-facts {
    right: auto;
    bottom: 34px;
    left: clamp(20px, 5vw, 72px);
  }

  .feature-list,
  .series-grid,
  .dealer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .nav {
    display: none;
  }

  .site-header {
    grid-template-columns: 1fr auto;
  }

  .intro,
  .buy-section {
    grid-template-columns: 1fr;
  }

  .official-strip {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 94svh;
    padding-bottom: 220px;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 64px;
    gap: 12px;
  }

  .brand {
    width: 124px;
    height: 36px;
  }

  .header-action {
    min-height: 38px;
    padding: 0 12px;
    font-size: 13px;
  }

  .hero {
    min-height: 92svh;
    padding-top: 96px;
    padding-bottom: 240px;
  }

  .hero::after {
    background:
      linear-gradient(180deg, rgba(8, 16, 22, 0.92) 0%, rgba(8, 16, 22, 0.72) 48%, rgba(8, 16, 22, 0.2) 100%),
      linear-gradient(180deg, rgba(8, 16, 22, 0) 64%, rgba(8, 16, 22, 0.9) 100%);
  }

  .hero-image {
    object-position: 62% bottom;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-facts {
    grid-template-columns: 1fr;
    bottom: 24px;
  }

  .hero-facts div {
    padding: 14px 16px;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

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

  .spec-grid,
  .feature-list,
  .series-grid,
  .dealer-grid {
    grid-template-columns: 1fr;
  }

  .dealer-grid article {
    min-height: auto;
  }

  .dealer-grid span {
    margin-bottom: 24px;
  }

  .image-panel img {
    min-height: 320px;
  }

  .series-grid img {
    aspect-ratio: 1.35;
  }

  .site-footer {
    display: grid;
  }

  .site-footer > div:last-child {
    text-align: left;
  }
}