:root {
  --bg: #07090d;
  --panel: #10161e;
  --panel-2: #121316;
  --text: #f6f8fb;
  --muted: #9eaab8;
  --line: rgba(255, 255, 255, .12);
  --green: #00d46f;
  --cyan: #50d7ff;
  --copper: #f05a3d;
  --amber: #f0b84a;
  --max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }

.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  height: 72px;
  background: rgba(7, 9, 13, .82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.nav-inner {
  height: 72px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
}

.brand img { width: 42px; height: 42px; }
.links { display: flex; align-items: center; gap: 28px; color: var(--muted); font-size: .9rem; }
.links a:hover { color: var(--text); }
.nav-cta {
  padding: 12px 18px;
  border-radius: 6px;
  color: #07120b !important;
  background: linear-gradient(135deg, var(--green), #7fe6ff);
  font-weight: 900;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 999px;
  background: rgba(255,255,255,.05);
}

.lang-switch button {
  min-width: 44px;
  height: 32px;
  border: 0;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: .78rem;
  font-weight: 900;
  cursor: pointer;
}

.lang-switch button.is-active {
  color: #06110b;
  background: linear-gradient(135deg, var(--green), #72e7ff);
}

.hero {
  min-height: 100vh;
  padding: 118px 0 70px;
  display: flex;
  align-items: center;
  background:
    linear-gradient(90deg, rgba(7, 9, 13, .99) 0%, rgba(7, 9, 13, .94) 31%, rgba(7, 9, 13, .58) 52%, rgba(7, 9, 13, .08) 78%),
    linear-gradient(180deg, rgba(80, 215, 255, .08), rgba(240, 90, 61, .04)),
    url("generated-hero/ahev-gpt-hero-showroom.png") right center / cover no-repeat;
}

.hero-copy {
  width: min(1400px, calc(100% - 80px));
  max-width: 1400px;
}

.eyebrow {
  display: inline-flex;
  padding: 8px 14px;
  border: 1px solid rgba(80, 215, 255, .34);
  border-radius: 999px;
  color: var(--cyan);
  background: rgba(80, 215, 255, .08);
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: 1px;
  text-transform: uppercase;
}

h1 {
  margin: 26px 0 22px;
  max-width: 610px;
  font-size: clamp(3.2rem, 4.8vw, 5.15rem);
  line-height: .98;
  letter-spacing: 0;
}

html[lang="zh-CN"] h1 {
  max-width: 8em;
  line-height: 1.06;
}

html[lang="zh-CN"] h2 {
  line-height: 1.08;
}

.lead {
  max-width: 545px;
  color: #c8d0da;
  font-size: 1.08rem;
  line-height: 1.65;
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  max-width: 650px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 6px;
  border: 1px solid var(--line);
  font-weight: 900;
  white-space: nowrap;
}

.btn-primary { color: #06110b; background: linear-gradient(135deg, var(--green), #72e7ff); border-color: rgba(127, 230, 255, .7); }
.btn-ghost { background: rgba(255, 255, 255, .06); }
.btn-ghost:hover { border-color: rgba(240, 90, 61, .46); background: rgba(240, 90, 61, .08); }

.proof {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  max-width: 650px;
  margin-top: 48px;
}

.proof div {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.proof strong {
  display: block;
  font-size: 1.85rem;
}

.proof span {
  color: var(--muted);
  font-size: .8rem;
  line-height: 1.35;
}

.section {
  padding: 96px 0;
}

.section.alt {
  background: linear-gradient(180deg, #0b1016 0%, #0c0f12 100%);
  border-top: 1px solid rgba(255,255,255,.08);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(280px, 520px) 1fr;
  gap: 48px;
  align-items: end;
  margin-bottom: 42px;
}

.kicker {
  display: block;
  color: var(--cyan);
  margin-bottom: 12px;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: 1px;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.02;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.split {
  display: grid;
  grid-template-columns: minmax(280px, 520px) 1fr;
  gap: 56px;
  align-items: start;
}

.copy-block p {
  margin: 0;
  color: #c8d0da;
  font-size: 1.04rem;
  line-height: 1.75;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.mini-grid article {
  min-height: 150px;
  min-width: 0;
  padding: 22px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  background: rgba(255,255,255,.035);
}

.mini-grid strong {
  display: block;
  margin-bottom: 10px;
  color: var(--text);
  font-size: 1rem;
}

.mini-grid span {
  display: block;
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.58;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.visual {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #0f141b;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .28);
}

.visual-warm {
  border-color: rgba(240, 90, 61, .28);
  box-shadow: 0 30px 90px rgba(240, 90, 61, .12), 0 30px 80px rgba(0, 0, 0, .34);
}

.visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

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

.card {
  padding: 24px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  background: var(--panel);
}

.alt .card {
  background: var(--panel-2);
  border-color: rgba(240, 90, 61, .16);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: .93rem;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.faq-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.faq-list article {
  padding: 24px;
  min-width: 0;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  background: var(--panel);
}

.faq-list h3 {
  margin: 0 0 12px;
  font-size: 1.04rem;
}

.faq-list p {
  margin: 0;
  color: var(--muted);
  font-size: .95rem;
  line-height: 1.64;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.inquiry {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 24px;
}

.panel {
  padding: 28px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  background: var(--panel);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.field { display: grid; gap: 6px; }
.wide { grid-column: 1 / -1; }
label { color: var(--muted); font-size: .8rem; font-weight: 800; }
input, select, textarea {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 11px 12px;
  background: #090d12;
  color: var(--text);
  font: inherit;
}
input:focus, select:focus, textarea:focus {
  outline: 0;
  border-color: rgba(80, 215, 255, .58);
  box-shadow: 0 0 0 3px rgba(80, 215, 255, .10);
}
textarea { min-height: 110px; resize: vertical; }

.footer {
  padding: 34px 0;
  color: var(--muted);
  border-top: 1px solid rgba(255,255,255,.08);
}

.seo-hero {
  min-height: 62vh;
  padding: 150px 0 80px;
  display: flex;
  align-items: end;
  background:
    linear-gradient(90deg, rgba(7, 9, 13, .99) 0%, rgba(7, 9, 13, .88) 54%, rgba(7, 9, 13, .35) 100%),
    url("/generated-hero/ahev-gpt-hero-showroom.png") right center / cover no-repeat;
}

.seo-hero h1 {
  max-width: 760px;
}

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

.seo-card {
  min-width: 0;
  padding: 26px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  background: var(--panel);
}

.seo-card h3 {
  margin: 0 0 12px;
  font-size: 1.12rem;
}

.seo-card p,
.seo-list li,
.spec-table span {
  color: var(--muted);
  line-height: 1.65;
}

.text-link {
  display: inline-flex;
  margin-top: 16px;
  color: var(--cyan);
  font-weight: 900;
}

.seo-list {
  margin-top: 42px;
  padding: 28px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  background: rgba(255,255,255,.035);
}

.seo-list h2 {
  margin-bottom: 18px;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.seo-list ul {
  margin: 0;
  padding-left: 20px;
}

.seo-list li + li {
  margin-top: 10px;
}

.spec-table {
  display: grid;
  margin-top: 42px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}

.spec-table div {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 18px 22px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

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

.seo-form {
  margin-top: 36px;
}

@media (max-width: 900px) {
  .links a:not(.nav-cta) { display: none; }
  .links { margin-left: auto; gap: 12px; }
  .hero {
    background:
      linear-gradient(90deg, rgba(7, 9, 13, .98) 0%, rgba(7, 9, 13, .88) 46%, rgba(7, 9, 13, .30) 100%),
      url("generated-hero/ahev-gpt-hero-showroom.png") 58% center / cover no-repeat;
  }
  .hero-copy { width: min(var(--max), calc(100% - 40px)); }
  h1 { max-width: 560px; font-size: clamp(2.6rem, 8vw, 4.4rem); }
  .section-head, .inquiry, .split { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
  .mini-grid, .faq-list, .seo-grid { grid-template-columns: 1fr; }
  .spec-table div { grid-template-columns: 1fr; gap: 6px; }
  .proof { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .container { width: 100%; padding-inline: 16px; }
  .links { display: flex; margin-left: auto; gap: 8px; }
  .links a:not(.nav-cta) { display: none; }
  .nav-cta { padding: 10px 12px; font-size: .76rem; white-space: nowrap; }
  .brand span { display: none; }
  .nav-inner { justify-content: space-between; gap: 8px; }
  .lang-switch { position: static; margin-left: 0; padding: 3px; flex-shrink: 0; }
  .lang-switch button { min-width: 38px; height: 30px; font-size: .74rem; }
  .hero {
    min-height: auto;
    padding: 104px 0 62px;
    background:
      linear-gradient(180deg, rgba(7, 9, 13, .86) 0%, rgba(7, 9, 13, .82) 42%, rgba(7, 9, 13, .98) 100%),
      linear-gradient(90deg, rgba(7, 9, 13, .98) 0%, rgba(7, 9, 13, .70) 68%, rgba(7, 9, 13, .42) 100%),
      url("generated-hero/ahev-gpt-hero-showroom.png") 62% center / cover no-repeat;
  }
  h1 { max-width: 9ch; font-size: 2.08rem; line-height: 1.05; overflow-wrap: normal; }
  h2 { max-width: 11ch; font-size: 1.82rem; line-height: 1.1; }
  html[lang="zh-CN"] h1 { max-width: 8em; font-size: 2.12rem; }
  html[lang="zh-CN"] h2 { max-width: 9em; }
  .hero-copy { max-width: 100%; }
  .lead, .section-head p { max-width: 30ch; font-size: .98rem; line-height: 1.62; }
  .copy-block p { max-width: 30ch; font-size: .98rem; line-height: 1.68; }
  .mini-grid, .faq-list, .cards { width: calc(100vw - 64px); max-width: 100%; overflow: hidden; }
  .mini-grid article { min-height: auto; padding: 22px; }
  .mini-grid span, .card p, .faq-list p { word-break: break-all; line-break: anywhere; }
  .actions { display: grid; }
  .actions, .proof { max-width: calc(100vw - 56px); }
  .btn { width: 100%; }
  .proof { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .seo-hero { min-height: auto; padding: 120px 0 66px; background-position: 62% center; }
  .seo-card, .seo-list { padding: 22px; }
}