:root {
  --ink: #101418;
  --muted: #69727c;
  --soft: #f3f5f7;
  --panel: #ffffff;
  --line: #dce2e7;
  --red: #e51f2f;
  --red-dark: #b9101c;
  --black: #101214;
  --silver: #edf1f4;
  --shadow: 0 24px 70px rgba(16, 20, 24, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 16px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(220, 226, 231, 0.78);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 230px;
}

.brand-symbol {
  width: 42px;
  height: 30px;
  background: var(--red);
  clip-path: polygon(0 0, 100% 50%, 0 100%, 23% 50%);
}

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

.brand-text strong {
  font-size: 16px;
  line-height: 1.15;
}

.brand-text small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 34px;
  color: #29313a;
  font-size: 15px;
  font-weight: 700;
}

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

.nav-cta,
.button,
.contact-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.nav-cta,
.button.primary,
.contact-form button {
  color: #fff;
  background: var(--red);
  box-shadow: 0 16px 32px rgba(229, 31, 47, 0.22);
}

.button.ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.46);
  background: rgba(255, 255, 255, 0.08);
}

.button.light {
  color: var(--red);
  background: #fff;
}

.nav-cta:hover,
.button:hover,
.contact-form button:hover {
  transform: translateY(-2px);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(320px, 0.78fr) minmax(520px, 1.22fr);
  align-items: center;
  min-height: 100vh;
  padding: 108px clamp(20px, 5vw, 72px) 56px;
  color: #fff;
  overflow: hidden;
  background:
    linear-gradient(105deg, rgba(10, 13, 16, 0.96) 0%, rgba(10, 13, 16, 0.84) 38%, rgba(10, 13, 16, 0.36) 66%, rgba(10, 13, 16, 0.12) 100%),
    #11161b;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 150px;
  background: linear-gradient(180deg, transparent, #fff);
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.series,
.section-heading span,
.factory-copy > span,
.contact-copy > span {
  display: inline-block;
  margin: 0 0 18px;
  color: var(--red);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(46px, 7vw, 94px);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero-desc {
  max-width: 620px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.hero-media {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 620px;
}

.hero-media img {
  width: min(100%, 980px);
  border-radius: 18px;
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.32);
  transform: translateX(22px);
}

.quick-stats {
  position: relative;
  z-index: 4;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  max-width: 1120px;
  margin: -42px auto 0;
  padding: 0 clamp(20px, 5vw, 72px);
}

.quick-stats div {
  min-height: 118px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 14px 36px rgba(16, 20, 24, 0.08);
}

.quick-stats strong {
  display: block;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
}

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

.section {
  padding: 96px clamp(20px, 5vw, 72px);
}

.section-heading {
  display: grid;
  grid-template-columns: 0.75fr 1fr;
  gap: 28px 56px;
  align-items: end;
  margin-bottom: 38px;
}

.section-heading span {
  grid-column: 1 / -1;
  margin-bottom: -10px;
}

.section-heading h2,
.factory-copy h2,
.dealer h2,
.contact-copy h2,
.config-band h2 {
  margin: 0;
  font-size: clamp(34px, 5vw, 66px);
  line-height: 1.06;
  letter-spacing: 0;
}

.section-heading p,
.factory-copy p,
.dealer p,
.contact-copy p,
.config-band p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

.product-showcase {
  display: grid;
  gap: 28px;
}

.model-card {
  display: grid;
  grid-template-columns: minmax(420px, 1.25fr) minmax(320px, 0.75fr);
  min-height: 520px;
  overflow: hidden;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 18px 60px rgba(16, 20, 24, 0.08);
}

.model-card.dark {
  background: #151719;
  color: #fff;
}

.model-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.model-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(26px, 4vw, 54px);
}

.model-code {
  margin: 0 0 12px;
  color: var(--red);
  font-size: 13px;
  font-weight: 900;
}

.model-info h3 {
  margin: 0;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.1;
}

.price {
  margin: 18px 0 24px;
  color: var(--red);
  font-size: 36px;
  font-weight: 900;
}

.price span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.dark .price span,
.dark dl dt {
  color: rgba(255, 255, 255, 0.62);
}

.model-info dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 0 0 30px;
}

.model-info dl div {
  padding: 14px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.74);
}

.dark .model-info dl div {
  background: rgba(255, 255, 255, 0.08);
}

.model-info dt {
  color: var(--muted);
  font-size: 13px;
}

.model-info dd {
  margin: 6px 0 0;
  font-size: 19px;
  font-weight: 900;
}

.model-info a {
  width: fit-content;
  color: #fff;
  background: var(--red);
  border-radius: 999px;
  padding: 13px 22px;
  font-weight: 900;
}

.config-band {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  color: #fff;
  background:
    linear-gradient(110deg, rgba(16, 18, 20, 0.98), rgba(16, 18, 20, 0.72)),
    url("assets/zhongqi-05.webp") center / cover;
}

.config-band p {
  max-width: 860px;
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.76);
}

.factory {
  display: grid;
  grid-template-columns: minmax(320px, 0.8fr) minmax(520px, 1.2fr);
  gap: 54px;
  align-items: center;
  background: #f7f8fa;
}

.factory-copy p {
  margin-top: 22px;
}

.factory-points {
  display: grid;
  gap: 12px;
  margin-top: 32px;
}

.factory-points div {
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.factory-points strong,
.factory-points span {
  display: block;
}

.factory-points span {
  margin-top: 6px;
  color: var(--muted);
}

.factory-images {
  display: grid;
  gap: 18px;
}

.factory-images img {
  width: 100%;
  aspect-ratio: 16 / 8.4;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: var(--shadow);
}

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

.buy-flow article {
  min-height: 260px;
  padding: 30px;
  color: #fff;
  background: #151719;
  border-radius: 16px;
}

.buy-flow b {
  color: var(--red);
  font-size: 42px;
}

.buy-flow h3 {
  margin: 44px 0 12px;
  font-size: 26px;
}

.buy-flow p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
}

.dealer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  align-items: center;
  padding: 82px clamp(20px, 5vw, 72px);
  color: #fff;
  background:
    linear-gradient(110deg, rgba(229, 31, 47, 0.94), rgba(174, 16, 27, 0.92)),
    #e51f2f;
}

.dealer .series,
.dealer p {
  color: rgba(255, 255, 255, 0.82);
}

.dealer p {
  max-width: 860px;
  margin-top: 18px;
}

.contact {
  display: grid;
  grid-template-columns: minmax(300px, 0.8fr) minmax(420px, 1fr);
  gap: 52px;
  align-items: start;
}

.contact-copy p {
  margin-top: 22px;
}

.contact-form {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 4vw, 42px);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: #29313a;
  font-size: 14px;
  font-weight: 800;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 14px 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: #f9fafb;
  font: inherit;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: 2px solid rgba(229, 31, 47, 0.2);
  border-color: var(--red);
}

.form-note {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 26px clamp(20px, 5vw, 72px);
  color: #c7cbd0;
  background: #101214;
}

.footer p {
  margin: 0;
}

@media (max-width: 1080px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    order: 3;
    grid-column: 1 / -1;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero,
  .section-heading,
  .model-card,
  .factory,
  .contact,
  .dealer,
  .config-band {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 146px;
  }

  .hero-media {
    min-height: auto;
  }

  .hero-media img {
    transform: none;
  }

  .quick-stats,
  .buy-flow {
    grid-template-columns: 1fr 1fr;
  }

  .model-card img {
    min-height: 360px;
  }
}

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

  .brand {
    min-width: 0;
  }

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

  .nav-cta {
    min-height: 38px;
    padding: 0 14px;
    font-size: 13px;
  }

  .nav {
    gap: 22px;
    font-size: 14px;
  }

  .hero {
    min-height: auto;
    padding: 144px 18px 54px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero-desc {
    font-size: 16px;
  }

  .quick-stats {
    grid-template-columns: 1fr 1fr;
    margin-top: 0;
    padding: 0 18px;
  }

  .quick-stats div {
    min-height: 100px;
    padding: 18px;
  }

  .section {
    padding: 66px 18px;
  }

  .model-card {
    border-radius: 14px;
  }

  .model-card img {
    min-height: 250px;
  }

  .model-info dl,
  .buy-flow {
    grid-template-columns: 1fr;
  }

  .config-band,
  .dealer {
    padding: 58px 18px;
  }

  .footer {
    flex-direction: column;
    padding: 24px 18px;
  }
}