:root {
  --red: #e10600;
  --ink: #111;
  --muted: #5c5c5c;
  --line: #e8e8e8;
  --paper: #fff;
  --wash: #f4f4f4;
  --cyan: #0095d9;
  --header-h: 64px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

#overview,
#highlights,
.feature,
.specs,
.consult {
  scroll-margin-top: calc(var(--header-h) + 8px);
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 15px;
}

.nav-main {
  display: flex;
  gap: 28px;
  align-items: center;
  font-size: 13px;
  color: #444;
}

.nav-main a:hover,
.nav-main a.is-active {
  color: var(--red);
}

.nav-cta {
  color: var(--red) !important;
  font-weight: 600;
}

.hero {
  min-height: calc(100vh - var(--header-h));
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) 1.2fr;
  align-items: center;
  gap: 32px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px 40px 48px;
}

.hero-copy {
  max-width: 560px;
}

.hero-visual {
  min-height: 62vh;
}

.hero-visual img {
  width: 100%;
  height: min(78vh, 720px);
  object-fit: cover;
  object-position: center;
  background: var(--wash);
}

.eyebrow {
  color: var(--cyan);
  font-size: 14px;
  letter-spacing: 0.28em;
  margin-bottom: 18px;
}

.hero-model {
  display: block;
  font-size: clamp(56px, 8vw, 92px);
  font-style: italic;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.9;
}

.hero-title {
  display: block;
  margin-top: 18px;
  font-size: clamp(32px, 4.4vw, 52px);
  font-weight: 800;
  color: var(--red);
  line-height: 1.15;
}

.hero-lead {
  margin: 24px 0 32px;
  color: var(--muted);
  font-size: 17px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--red);
  color: #fff;
  border: 0;
  border-radius: 999px;
  padding: 12px 28px;
  font-size: 14px;
  cursor: pointer;
}

.btn-primary:hover {
  filter: brightness(0.94);
}

.feature-media {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto 48px;
}

.feature-media img {
  width: 100%;
  height: min(72vh, 760px);
  object-fit: cover;
  object-position: center;
  background: var(--wash);
}

.feature-media-triple {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  width: min(1400px, calc(100% - 48px));
}

.feature-media-triple img {
  height: min(42vh, 420px);
}

.intro {
  text-align: center;
  padding: 120px 24px 100px;
}

.intro-kicker {
  font-size: 13px;
  letter-spacing: 0.55em;
  color: #c8b48a;
  margin-bottom: 28px;
}

.intro-line {
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.55;
}

.feature {
  padding-bottom: 32px;
}

.feature-head {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
  padding: 72px 24px 36px;
}

.feature-index {
  color: var(--red);
  font-style: italic;
  font-weight: 700;
  font-size: 28px;
  margin-bottom: 8px;
}

.feature-en {
  font-size: 12px;
  letter-spacing: 0.48em;
  color: #c8b48a;
  margin-bottom: 22px;
}

.feature-head h2 {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.2;
  margin-bottom: 20px;
}

.feature-desc {
  color: var(--muted);
  font-size: 17px;
}

.modes {
  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);
}

.mode-card {
  background: #fff;
  padding: 48px 36px;
}

.mode-card span {
  color: var(--red);
  font-style: italic;
  font-weight: 700;
}

.mode-card h3 {
  font-size: 28px;
  margin: 10px 0 12px;
}

.mode-card p {
  color: var(--muted);
}

.specs {
  padding: 120px 32px;
  max-width: 980px;
  margin: 0 auto;
}

.specs-head {
  text-align: center;
  margin-bottom: 56px;
}

.specs-head h2 {
  font-size: clamp(32px, 4vw, 48px);
}

.specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 64px;
}

.specs-grid div {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.specs-grid dt {
  color: #888;
  font-size: 13px;
}

.specs-grid dd {
  font-weight: 600;
}

.consult {
  text-align: center;
  padding: 120px 24px 80px;
  background: #111;
  color: #fff;
}

.consult .eyebrow {
  color: #c8b48a;
}

.consult h2 {
  font-size: clamp(32px, 5vw, 56px);
  margin: 8px 0 16px;
}

.consult > p {
  color: #b8b8b8;
}

.consult-form {
  max-width: 640px;
  margin: 40px auto 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  text-align: left;
}

.consult-form label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  color: #cfcfcf;
}

.consult-form .full,
.consult-form button {
  grid-column: 1 / -1;
}

.consult-form input,
.consult-form textarea {
  border: 1px solid #333;
  background: #1a1a1a;
  color: #fff;
  padding: 12px 14px;
  font: inherit;
  border-radius: 6px;
}

.consult-form button {
  justify-self: center;
  margin-top: 8px;
}

.site-footer {
  background: #111;
  color: #7a7a7a;
  text-align: center;
  padding: 0 24px 48px;
  font-size: 13px;
}

@media (max-width: 900px) {
  .hero {
    min-height: 78vh;
  }

  .hero-copy {
    padding: 40px 24px 48px;
  }

  .nav-main {
    gap: 14px;
    font-size: 12px;
  }

  .modes,
  .specs-grid,
  .consult-form,
  .feature-media-triple {
    grid-template-columns: 1fr;
  }

  .feature-media,
  .feature-media-triple {
    width: 100%;
  }

  .feature-media img,
  .feature-media-triple img {
    height: 52vw;
    min-height: 220px;
  }
}