/* ============ TOKENS ============ */
:root {
  --ink: #1a1a1a;
  --ink-soft: #3a3a3a;
  --muted: #6b6b6b;
  --line: #e7e4df;
  --paper: #fbf9f5;
  --paper-2: #f3efe7;
  --white: #ffffff;
  --accent: #d4302a;          /* China red */
  --accent-deep: #a8221c;
  --electric: #1d4ed8;        /* EV blue accent */
  --gold: #b08a3e;

  --serif: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
  --serif-zh: 'Noto Serif SC', 'Playfair Display', serif;
  --sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  --container: 1240px;
  --gutter: clamp(20px, 4vw, 48px);
  --r-sm: 4px;
  --r-md: 8px;

  --shadow-sm: 0 2px 12px rgba(20,20,20,0.06);
  --shadow-md: 0 8px 32px rgba(20,20,20,0.10);

  --ease: cubic-bezier(.2,.7,.3,1);
}

html[lang="zh"] {
  --serif: var(--serif-zh);
}

/* ============ BASE ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--accent); }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 700; letter-spacing: -0.01em; line-height: 1.15; margin: 0; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ============ HEADER ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251,249,245,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding-top: 16px;
  padding-bottom: 16px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.logo svg { color: var(--ink); flex-shrink: 0; }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-main {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.02em;
}
.logo-sub {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2px;
}
.main-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 500;
}
.main-nav a {
  position: relative;
  padding: 4px 0;
  color: var(--ink-soft);
}
.main-nav a.active { color: var(--ink); }
.main-nav a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--accent);
}
.header-tools { display: flex; align-items: center; gap: 16px; }
.lang-toggle {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  transition: all .2s var(--ease);
}
.lang-toggle:hover { background: var(--ink); color: var(--paper); }
.lang-sep { margin: 0 4px; opacity: .4; }
html[lang="en"] .lang-en { font-weight: 700; }
html[lang="en"] .lang-zh { opacity: .4; }
html[lang="zh"] .lang-zh { font-weight: 700; }
html[lang="zh"] .lang-en { opacity: .4; }

.menu-btn { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.menu-btn span { width: 22px; height: 2px; background: var(--ink); }

/* ============ HERO ============ */
.hero {
  position: relative;
  padding: clamp(56px, 9vw, 120px) 0 clamp(64px, 10vw, 140px);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(40px, 5vw, 80px);
  align-items: center;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero-eyebrow::before {
  content: '';
  width: 24px; height: 1px; background: var(--accent);
}
.hero-title {
  font-size: clamp(44px, 7vw, 96px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.98;
  margin-bottom: 28px;
}
.hero-title em {
  font-style: italic;
  font-weight: 500;
  color: var(--accent);
}
.hero-deck {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 52ch;
  margin-bottom: 36px;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px -10px rgba(212,48,42,0.5);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-ghost:hover {
  background: var(--ink);
  color: var(--white);
  transform: translateY(-2px);
}
.btn-primary::after,
.btn-ghost::after {
  content: "→";
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: 0;
  transition: transform .25s var(--ease);
}
.btn-primary:hover::after,
.btn-ghost:hover::after {
  transform: translateX(4px);
}
.hero-meta {
  display: flex;
  gap: 32px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.hero-meta strong { color: var(--ink); font-weight: 700; }

.hero-visual {
  position: relative;
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
  border-radius: var(--r-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(212,48,42,0.25), transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(29,78,216,0.20), transparent 50%);
}
.hero-visual-art {
  position: relative;
  z-index: 2;
  width: 90%;
  height: 90%;
}
.hero-visual img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 50%;
  z-index: 2;
  display: block;
}

/* ============ SECTIONS ============ */
section { padding: clamp(64px, 8vw, 120px) 0; }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: clamp(40px, 5vw, 64px);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.section-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.section-deck {
  max-width: 42ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

/* ============ FEATURE GRID ============ */
.feature-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px;
}
.feature-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-card.large { grid-row: span 2; }
.feature-thumb {
  aspect-ratio: 16/10;
  background: var(--paper-2);
  overflow: hidden;
  position: relative;
}
.feature-card.large .feature-thumb { aspect-ratio: 4/3; }
.feature-thumb svg { width: 100%; height: 100%; display: block; }
.feature-thumb.has-photo {
  background:
    radial-gradient(circle at 35% 50%, rgba(212,48,42,0.06), transparent 55%),
    linear-gradient(135deg, #1f1f1f 0%, #2a2a2a 50%, #141414 100%);
}
.feature-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.feature-body { padding: 24px 24px 28px; flex: 1; display: flex; flex-direction: column; }
.feature-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.feature-title {
  font-size: 20px;
  line-height: 1.25;
  margin-bottom: 12px;
}
.feature-card.large .feature-title { font-size: 30px; }
.feature-desc {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 16px;
  flex: 1;
}
.feature-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  gap: 16px;
}

/* ============ BRAND STRIP ============ */
.brand-strip {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(48px, 6vw, 72px) 0;
}
.brand-strip .section-head { border-color: rgba(255,255,255,0.12); }
.brand-strip .section-title { color: var(--paper); }
.brand-strip .section-deck { color: rgba(255,255,255,0.6); }
.brand-strip .section-eyebrow { color: #ff6b63; }

.brand-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.12);
}
.brand-cell {
  background: var(--ink);
  padding: 32px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 140px;
  transition: background .25s var(--ease);
  cursor: pointer;
}
.brand-cell:hover { background: #252525; }
.brand-name {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.brand-cell-sub {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}

/* ============ MODELS GRID ============ */
.models-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.model-card {
  display: grid;
  grid-template-columns: 1fr;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: box-shadow .3s var(--ease), transform .3s var(--ease);
}
.model-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.model-thumb {
  aspect-ratio: 16/9;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0)) ,
    linear-gradient(135deg, #1f1f1f 0%, #2a2a2a 50%, #1a1a1a 100%);
  position: relative;
  overflow: hidden;
}
.model-thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(212,48,42,0.06), transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(255,255,255,0.04), transparent 55%);
  pointer-events: none;
}
.model-thumb svg { width: 100%; height: 100%; position: relative; }
.model-thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  position: relative;
  animation: fadeIn .5s var(--ease) both;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.model-thumb.has-photo {
  background:
    radial-gradient(circle at 30% 50%, rgba(212,48,42,0.08), transparent 55%),
    linear-gradient(135deg, #1f1f1f 0%, #2a2a2a 50%, #141414 100%);
}
.img-credit {
  position: absolute;
  bottom: 8px;
  right: 10px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.75);
  background: rgba(0,0,0,0.45);
  padding: 3px 8px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
}
.model-body { padding: 28px; }
.model-brand {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.model-name { font-size: 26px; margin-bottom: 12px; }
.model-tagline { color: var(--muted); font-size: 14px; margin-bottom: 20px; line-height: 1.5; }
.model-specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.spec-label {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.spec-value {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

/* ============ NEWS LIST ============ */
.news-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
}
.news-main-article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.news-main-thumb { aspect-ratio: 16/10; position: relative; overflow: hidden; }
.news-main-thumb svg { width: 100%; height: 100%; display: block; }
.news-main-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.news-main-thumb.has-photo {
  background:
    radial-gradient(circle at 30% 60%, rgba(212,48,42,0.07), transparent 55%),
    linear-gradient(135deg, #1f1f1f 0%, #2a2a2a 50%, #141414 100%);
}
.news-main-body { padding: 32px; }
.news-side { display: flex; flex-direction: column; }
.news-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 20px;
  cursor: pointer;
  transition: transform .25s var(--ease);
}
.news-item:hover { transform: translateX(4px); }
.news-item:first-child { padding-top: 0; }
.news-item:last-child { border-bottom: 0; }
.news-thumb {
  aspect-ratio: 1;
  background: var(--paper-2);
  border-radius: var(--r-sm);
  overflow: hidden;
  position: relative;
}
.news-thumb svg { width: 100%; height: 100%; display: block; }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.news-thumb.has-photo {
  background:
    linear-gradient(135deg, #1f1f1f 0%, #262626 100%);
}
.news-meta {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.news-title { font-size: 17px; line-height: 1.3; margin-bottom: 6px; }
.news-date { font-size: 12px; color: var(--muted); font-family: var(--mono); letter-spacing: 0.08em; }

/* ============ TECH SECTION ============ */
.tech-section { background: var(--paper-2); }
.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.tech-card {
  background: var(--white);
  padding: 40px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.tech-num {
  font-family: var(--serif);
  font-size: 64px;
  font-weight: 900;
  color: var(--paper-2);
  position: absolute;
  top: 24px;
  right: 32px;
  line-height: 1;
}
.tech-card h3 {
  font-size: 24px;
  margin-bottom: 16px;
  max-width: 80%;
}
.tech-card p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.6;
  margin: 0 0 20px;
}
.tech-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tech-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
}

/* ============ PULL QUOTE ============ */
.pullquote {
  padding: clamp(56px, 8vw, 96px) 0;
  background: var(--ink);
  color: var(--paper);
  text-align: center;
}
.pullquote-text {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.25;
  max-width: 20ch;
  margin: 0 auto 24px;
  letter-spacing: -0.01em;
}
.pullquote-text::before { content: '"'; color: var(--accent); margin-right: 4px; }
.pullquote-text::after { content: '"'; color: var(--accent); margin-left: 4px; }
.pullquote-attr {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
}

/* ============ BRAND STICKY NAV ============ */
.brand-sticky-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand-sticky-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 12px;
  padding-bottom: 12px;
  flex-wrap: wrap;
}
.brand-sticky-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-right: 8px;
}
.brand-sticky-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 8px 14px;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.brand-sticky-link:hover {
  background: var(--white);
  border-color: var(--ink);
  transform: translateY(-1px);
}
.brand-sticky-link.is-active {
  background: var(--ink);
  color: var(--white);
  border-color: var(--ink);
}
.brand-sticky-count {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  opacity: 0.7;
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 999px;
}
.brand-sticky-link.is-active .brand-sticky-count {
  background: rgba(255,255,255,0.16);
  color: rgba(255,255,255,0.85);
}

/* Anchor offset so headings aren't hidden under sticky bars */
.brand-section { scroll-margin-top: 120px; }

/* ============ MODELS FILTER ============ */
.models-filter-wrap {
  background: var(--paper-2);
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}
.models-filter-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}
.models-filter-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}
.models-filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 8px 14px;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.chip:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}
.chip.is-active {
  background: var(--ink);
  color: var(--white);
  border-color: var(--ink);
}
.chip-count {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  opacity: 0.7;
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 999px;
}
.chip.is-active .chip-count {
  background: rgba(255,255,255,0.16);
  color: rgba(255,255,255,0.85);
}
.models-empty {
  padding: 80px 0;
  text-align: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
}

/* ============ BRANDS PAGE ============ */
.page-header {
  padding: clamp(72px, 9vw, 120px) 0 clamp(48px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}
.page-header--dark {
  background: var(--ink);
  color: var(--white);
  border-bottom: 0;
}
.page-header--dark .page-title { color: var(--white); }
.page-header--dark .page-deck { color: rgba(255,255,255,0.72); }
.page-header--dark .section-eyebrow { color: rgba(255,255,255,0.55); }
.page-header--dark .section-eyebrow::before { background: rgba(255,255,255,0.6); }
.tech-section--continuous {
  background: var(--ink);
  padding-top: clamp(32px, 4vw, 56px);
}
.tech-section--continuous .tech-card {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.1);
}
.tech-section--continuous .tech-card h3 { color: var(--white); }
.tech-section--continuous .tech-card p { color: rgba(255,255,255,0.72); }
.tech-section--continuous .tech-num { color: rgba(255,255,255,0.08); }
.tech-section--continuous .tech-tag {
  color: rgba(255,255,255,0.75);
  border-color: rgba(255,255,255,0.18);
}
.page-title {
  font-size: clamp(48px, 6vw, 84px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 24px;
}
.page-deck {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 60ch;
}

.brands-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.brand-section { padding: clamp(56px, 7vw, 96px) 0; border-top: 1px solid var(--line); }
.brand-section:first-of-type { border-top: none; padding-top: clamp(40px, 5vw, 64px); }
.brand-section .section-head { margin-bottom: 40px; }
.brand-subgroup { margin-top: 56px; }
.brand-subgroup:first-child { margin-top: 0; }
.brand-subgroup-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0 16px;
  margin-bottom: 24px;
  border-bottom: 1px dashed var(--line);
}
.brand-subgroup-label {
  font-family: var(--font-mono, 'Inter', monospace);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent, #d4302a);
  padding: 4px 8px;
  border: 1px solid currentColor;
  border-radius: 2px;
  flex-shrink: 0;
}
.brand-subgroup-title {
  font-family: var(--font-serif, 'Playfair Display', serif);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
  flex: 1;
}
.brand-subgroup-count {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  color: var(--text-muted, #6b6b6b);
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
@media (max-width: 640px) {
  .brand-subgroup-head { flex-wrap: wrap; gap: 8px 12px; }
  .brand-subgroup-title { font-size: 20px; flex-basis: 100%; order: 2; }
  .brand-subgroup-label { order: 1; }
  .brand-subgroup-count { order: 3; }
}
.brand-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: box-shadow .3s var(--ease), transform .3s var(--ease);
}
.brand-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.brand-card.is-focused {
  box-shadow: 0 0 0 2px var(--red, #d4302a), 0 14px 38px -10px rgba(212,48,42,0.45);
  animation: brandFocusPulse 2.4s var(--ease, ease) 1;
}
@keyframes brandFocusPulse {
  0%   { box-shadow: 0 0 0 0 rgba(212,48,42,0.55), 0 0 0 2px rgba(212,48,42,0); }
  20%  { box-shadow: 0 0 0 8px rgba(212,48,42,0.18), 0 0 0 2px rgba(212,48,42,0.9); }
  100% { box-shadow: 0 0 0 0 rgba(212,48,42,0),    0 0 0 2px rgba(212,48,42,0); }
}
.brand-card-thumb {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, #1a1a1a, #2d2d2d);
  position: relative;
  overflow: hidden;
}
.brand-card-thumb svg { width: 100%; height: 100%; }
.brand-card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.brand-card-thumb.has-photo {
  background:
    radial-gradient(circle at 40% 50%, rgba(212,48,42,0.06), transparent 55%),
    linear-gradient(135deg, #1f1f1f 0%, #2a2a2a 50%, #141414 100%);
}
.brand-card-body { padding: 28px; }
.brand-card-parent {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
}
.brand-card-parent strong {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.12em;
}
.brand-card-name {
  font-size: 28px;
  margin-bottom: 4px;
}
.brand-card-cn {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.brand-card-desc {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
  margin: 0 0 16px;
}
.brand-card-sublist {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0 0 18px;
  padding: 12px 14px;
  background: var(--paper-2);
  border-radius: 6px;
  border-left: 3px solid var(--accent);
}
.brand-card-sublist .spec-label { font-size: 9px; }
.brand-card-sublist-val {
  font-family: var(--serif-sc, var(--serif));
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
}
.brand-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.brand-fact .spec-label { font-size: 9px; }
.brand-fact .spec-value { font-size: 14px; }

/* ============ ABOUT ============ */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  padding: clamp(48px, 6vw, 72px) 0;
}
.about-sidebar h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.about-sidebar p { color: var(--muted); font-size: 14px; line-height: 1.6; }
.about-sidebar > div { margin-bottom: 32px; }

/* About — extended blocks */
.about-block {
  padding: clamp(56px, 7vw, 96px) 0;
  border-top: 1px solid var(--line);
}
.about-block-inner { max-width: 880px; }
.about-block-title {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 12px 0 20px;
  max-width: 28ch;
}
.about-block-body {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 64ch;
}
.about-block--mission { background: var(--paper-2); }
.about-block--principles { background: var(--white); }
.about-block--coverage { background: var(--paper-2); }
.about-block--contact { background: var(--ink); color: var(--white); }
.about-block--contact .section-eyebrow { color: rgba(255,255,255,0.55); }
.about-block--contact .section-eyebrow::before { background: rgba(255,255,255,0.6); }
.about-block--contact .about-block-title { color: var(--white); }
.about-block--contact .about-block-body { color: rgba(255,255,255,0.78); }

.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}
.principle-card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 28px 28px 32px;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.principle-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.principle-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 12px;
}
.principle-card h3 {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}
.principle-card p {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 0;
}
.about-main p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0 0 24px;
}
.about-main p:first-child::first-letter {
  font-family: var(--serif);
  font-size: 72px;
  font-weight: 900;
  float: left;
  line-height: 0.85;
  margin: 6px 12px 0 0;
  color: var(--accent);
}

/* ============ FOOTER ============ */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
  margin-top: clamp(64px, 8vw, 120px);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-logo {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 24px;
  color: var(--paper);
  margin-bottom: 12px;
}
.footer-brand p { font-size: 14px; line-height: 1.6; max-width: 36ch; margin: 0; }
.footer-col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper);
  margin-bottom: 16px;
  font-weight: 500;
}
.footer-col a {
  display: block;
  font-size: 14px;
  padding: 6px 0;
  color: rgba(255,255,255,0.7);
}
.footer-col a:hover { color: var(--accent); }
.footer-meta p { font-size: 13px; margin: 0 0 6px; }

/* ============ RESPONSIVE ============ */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { aspect-ratio: 16/9; max-width: 100%; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-card.large { grid-column: span 2; grid-row: auto; }
  .brand-row { grid-template-columns: repeat(3, 1fr); }
  .models-grid, .tech-grid, .brands-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-content { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 720px) {
  .main-nav { display: none; }
  .menu-btn { display: flex; }
  .main-nav.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    background: var(--paper);
    padding: 24px;
    border-bottom: 1px solid var(--line);
    gap: 16px;
  }
  .logo-sub { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card.large { grid-column: auto; }
  .brand-row { grid-template-columns: repeat(2, 1fr); }
  .hero-meta { flex-direction: column; gap: 12px; }
  .section-head { flex-direction: column; align-items: flex-start; }
  .news-item { grid-template-columns: 80px 1fr; }
}

/* ============ ANIMATIONS ============ */
@media (prefers-reduced-motion: no-preference) {
  .feature-card, .model-card, .brand-card, .tech-card {
    animation: fadeUp .6s var(--ease) both;
  }
  .feature-card:nth-child(2) { animation-delay: .08s; }
  .feature-card:nth-child(3) { animation-delay: .16s; }
  .feature-card:nth-child(4) { animation-delay: .24s; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ UTILS ============ */
.text-zh { font-family: var(--serif-zh); }
html[lang="zh"] body { font-family: 'Noto Sans SC', var(--sans); }
html[lang="zh"] h1, html[lang="zh"] h2, html[lang="zh"] h3, html[lang="zh"] h4 {
  font-family: 'Noto Serif SC', var(--serif);
  letter-spacing: 0;
}
html[lang="zh"] .hero-title { letter-spacing: 0; }

/* ============ HOT STRIP (top brand quick links) ============ */
.hot-strip {
  background: #f5f5f0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 10px 0;
}
.hot-strip-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.hot-strip-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  flex-shrink: 0;
}
.hot-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  transition: all 0.18s ease;
  letter-spacing: 0.02em;
}
.hot-pill:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ============ HOME BRANDS — 3 COLUMN GROUPS ============ */
.home-brands-cols {
  display: grid;
  grid-template-columns: 1fr 1fr 1.4fr;
  gap: 28px;
  margin-top: 8px;
}
.home-brands-col {
  display: flex;
  flex-direction: column;
}
.home-brands-col-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.home-brands-col-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.home-brands-col-count {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.home-brands-col-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.home-brands-col-list-compact {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 6px;
  align-content: flex-start;
}
.brand-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 11px;
  border-radius: 4px;
  background: #fafaf7;
  border: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  transition: all 0.18s ease;
}
.brand-pill:hover {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.home-brands-viewall {
  display: flex;
  justify-content: flex-end;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}
.home-brands-viewall-link {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
}
.home-brands-viewall-link:hover { text-decoration: underline; }

@media (max-width: 900px) {
  .home-brands-cols {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ============ BRAND INDEX STATS BAND ============ */
.brand-index-stats-wrap {
  background: #fafaf7;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 36px 0;
  margin-bottom: 0;
}
.brand-index-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.brand-stat {
  text-align: left;
  padding: 0 4px;
  border-left: 2px solid var(--rule);
  padding-left: 18px;
}
.brand-stat:first-child { border-left: 2px solid var(--accent); }
.brand-stat-total { border-left-color: var(--accent); }
.brand-stat-num {
  font-family: var(--serif);
  font-size: clamp(36px, 4vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  margin-bottom: 8px;
}
.brand-stat-total .brand-stat-num { color: var(--accent); }
.brand-stat-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}
@media (max-width: 700px) {
  .brand-index-stats { grid-template-columns: repeat(2, 1fr); gap: 28px 16px; }
}

/* ============ MODELS — DUAL CURRENCY ============ */
.spec-price-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}
.spec-price-dual {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* ============ NEWS COLUMN BLOCK ============ */
.news-column-wrap {
  padding: 0 0 40px;
}
.news-column {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr;
  background: #1a1a1a;
  color: #fff;
  border-radius: 2px;
  overflow: hidden;
}
.news-column-left {
  padding: clamp(28px, 4vw, 48px);
  background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
}
.news-column-right {
  padding: clamp(28px, 4vw, 48px);
  border-left: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.news-column-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.news-column-title {
  font-family: var(--serif);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 14px;
  color: #fff;
}
.news-column-deck {
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(255,255,255,0.72);
  margin: 0 0 20px;
  max-width: 36ch;
}
.news-column-cta {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 3px;
  align-self: flex-start;
}
.news-column-cta:hover { color: #fff; border-color: #fff; }
.news-column-latest-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 8px;
}
.news-column-date {
  font-family: var(--mono);
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  margin-bottom: 14px;
}
.news-column-headline {
  font-family: var(--serif);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  line-height: 1.3;
  color: #fff;
  margin: 0;
}
@media (max-width: 800px) {
  .news-column { grid-template-columns: 1fr; }
  .news-column-right { border-left: 0; border-top: 1px solid rgba(255,255,255,0.08); }
}

/* ============ NEWSLETTER ============ */
.newsletter {
  background: #111;
  color: #fff;
  padding: clamp(48px, 6vw, 80px) 0;
  margin-top: 40px;
}
.newsletter-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.newsletter-text { max-width: 52ch; }
.newsletter-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.newsletter-title {
  font-family: var(--serif);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 16px;
  color: #fff;
}
.newsletter-deck {
  font-size: 15px;
  line-height: 1.65;
  color: rgba(255,255,255,0.72);
  margin: 0;
}
.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.newsletter-input {
  width: 100%;
  padding: 14px 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 2px;
  color: #fff;
  font-family: var(--sans);
  font-size: 15px;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.newsletter-input::placeholder { color: rgba(255,255,255,0.4); }
.newsletter-input:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255,255,255,0.08);
}
.newsletter-input-error { border-color: var(--accent); }
.newsletter-btn {
  padding: 14px 24px;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.18s ease, transform 0.18s ease;
}
.newsletter-btn:hover { background: #b8261f; transform: translateY(-1px); }
.newsletter-ok {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  padding: 16px;
  background: rgba(212,48,42,0.08);
  border: 1px solid rgba(212,48,42,0.3);
  border-radius: 2px;
  text-align: center;
  letter-spacing: 0.05em;
}
.newsletter-note {
  font-family: var(--mono);
  font-size: 10.5px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  margin-top: 4px;
}
@media (max-width: 800px) {
  .newsletter-inner { grid-template-columns: 1fr; }
}

/* Brand strip (dark) overrides for home-brands-cols */
.brand-strip .home-brands-col-head { border-bottom-color: rgba(255,255,255,0.12); }
.brand-strip .home-brands-col-label { color: rgba(255,255,255,0.55); }
.brand-strip .home-brands-col-count { color: var(--accent); }
.brand-strip .brand-pill {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.92);
}
.brand-strip .brand-pill:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.brand-strip .home-brands-viewall {
  border-top-color: rgba(255,255,255,0.12);
}
.brand-strip .home-brands-viewall-link { color: #ff6b63; }
.brand-strip .brand-cell {
  background: transparent;
  border: 0;
  padding: 14px 0;
  min-height: auto;
  align-items: flex-start;
  text-align: left;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.brand-strip .brand-cell:last-child { border-bottom: 0; }
.brand-strip .brand-cell:hover { background: transparent; }
.brand-strip .brand-cell:hover .brand-name { color: var(--accent); }
.brand-strip .brand-name { font-size: 18px; transition: color 0.2s; }
.brand-strip .brand-cell-sub { color: rgba(255,255,255,0.5); margin-top: 2px; }