/* ============================================================
   VU TRINH CNC GROUP — Main Stylesheet
   Industrial, Precision, Professional
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@400;500;600;700;800&family=Barlow:wght@300;400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* ============================================================
   CSS VARIABLES
   ============================================================ */
:root {
  /* ── Brand Colors (from VTI Brand Guideline) ──────────────────
     #3A3A3A  Charcoal   — brand dark / surfaces / borders
     #CCCCCC  Silver     — brand light / primary text on dark
     #AD0E0E  Brand Red  — primary accent / action / highlight
     ──────────────────────────────────────────────────────────── */

  /* Backgrounds — built from brand charcoal, stepped darker */
  --color-bg: #111111;          /* near-black base, darker than #3A3A3A */
  --color-surface: #242424;     /* raised surface — enough contrast vs bg */
  --color-surface-2: #2e2e2e;   /* second-level surface / hover state */

  /* Borders — using brand charcoal as the scale anchor */
  --color-border: #333333;      /* visible structural border */
  --color-border-light: #3a3a3a; /* brand charcoal — mid border */

  /* Text — anchored to brand silver #CCCCCC */
  --color-text-primary: #cccccc;  /* brand silver — primary readable text */
  --color-text-secondary: #8a8a8a; /* mid-gray, between charcoal and silver */
  --color-text-muted: #555555;    /* subdued labels, hints */

  /* Accent — brand red #AD0E0E */
  --color-accent: #ad0e0e;                    /* brand red — primary accent */
  --color-accent-dim: rgba(173, 14, 14, 0.12); /* tinted bg for hover states */
  --color-accent-hover: #c41010;              /* slightly brighter on hover */

  /* Steel — neutral mid-tones derived from brand silver */
  --color-steel: #777777;
  --color-steel-light: #aaaaaa;

  /* Semantic */
  --color-success: #4caf85;
  --color-danger: #cc3333;

  /* Typography */
  --font-display: 'Barlow Condensed', sans-serif;
  --font-body: 'Barlow', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Spacing */
  --section-pad: 96px;
  --container-max: 1200px;
  --container-pad: 48px;

  /* Transitions */
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.section {
  padding: var(--section-pad) 0;
}

.section--alt {
  background-color: var(--color-surface);
}

.section--dark {
  background-color: var(--color-bg);
}

/* Section Labels */
.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--color-accent);
}

/* Section Headers */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.section-subtitle {
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

/* Divider */
.divider {
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  margin: 24px 0;
}

/* Tag/Badge */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  border-radius: 2px;
}

.tag--accent {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  border-radius: 2px;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #ffffff;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(173, 14, 14, 0.30);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-light);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

.btn--whatsapp {
  background: #25D366;
  color: white;
}

.btn--whatsapp:hover {
  background: #1fb855;
  transform: translateY(-1px);
}

.btn--zalo {
  background: #0190F3;
  color: white;
}

.btn--zalo:hover {
  background: #0178cc;
  transform: translateY(-1px);
}

.btn--sm {
  padding: 10px 20px;
  font-size: 13px;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ============================================================
   HEADER / NAVIGATION
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14, 15, 17, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 4px 32px rgba(0,0,0,0.4);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 32px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-mark {
  width: 48px;
  height: 48px;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0;
}

.logo-mark svg {
  width: 48px;
  height: 48px;
  fill: #ffffff;
}

.logo-mark img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-text .name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-primary);
}

.logo-text .tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  padding: 8px 14px;
  border-radius: 2px;
  transition: color var(--transition), background var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 16px;
  border-left: 1px solid var(--color-border);
  padding-left: 16px;
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: 5px 8px;
  border-radius: 2px;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  background: transparent;
}

.lang-btn:hover,
.lang-btn.active {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-secondary);
  transition: all var(--transition);
  border-radius: 1px;
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  min-height: 88vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(173, 14, 14, 0.03) 0%, transparent 50%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 40px,
      rgba(255,255,255,0.01) 40px,
      rgba(255,255,255,0.01) 41px
    );
  pointer-events: none;
}

.hero-content {
  padding: 80px var(--container-pad) 80px calc((100vw - var(--container-max)) / 2 + var(--container-pad));
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.hero-eyebrow-line {
  width: 40px;
  height: 2px;
  background: var(--color-accent);
}

.hero-eyebrow-text {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: 28px;
}

.hero-title em {
  font-style: normal;
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: 17px;
  font-weight: 300;
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: 480px;
  margin-bottom: 40px;
}

/* Hero stats */
.hero-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.hero-stat-value {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  color: var(--color-text-primary);
  line-height: 1;
}

.hero-stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Hero image */
.hero-visual {
  position: relative;
  height: 100%;
  min-height: 88vh;
  overflow: hidden;
}

.hero-image-wrap {
  position: absolute;
  inset: 0;
}

.hero-image-wrap img,
.image-placeholder {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-placeholder {
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.image-placeholder svg {
  width: 40px;
  height: 40px;
  opacity: 0.3;
}

.hero-image-wrap::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 120px;
  background: linear-gradient(to right, var(--color-bg), transparent);
  pointer-events: none;
}

/* Hero badge */
.hero-badge {
  position: absolute;
  bottom: 40px;
  right: 40px;
  background: rgba(14,15,17,0.85);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  padding: 14px 20px;
  border-radius: 4px;
  z-index: 2;
}

.hero-badge-title {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.hero-badge-text {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
}

/* ============================================================
   MARQUEE / TICKER
   ============================================================ */
.ticker-bar {
  background: var(--color-accent);
  padding: 10px 0;
  overflow: hidden;
  position: relative;
}

.ticker-track {
  display: flex;
  animation: ticker 30s linear infinite;
  width: max-content;
}

.ticker-item {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #ffffff;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 12px;
}

.ticker-item::after {
  content: '◆';
  font-size: 6px;
  opacity: 0.6;
}

@keyframes ticker {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ============================================================
   WHAT WE DO SECTION
   ============================================================ */
.what-we-do {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.what-we-do .image-side {
  position: relative;
}

.what-we-do .image-side::before {
  content: '';
  position: absolute;
  inset: -16px -16px 16px 16px;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  pointer-events: none;
}

.what-we-do .image-side .image-placeholder {
  aspect-ratio: 4/3;
  border-radius: 2px;
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 32px;
}

.process-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.process-step:last-child {
  border-bottom: none;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-accent);
  min-width: 24px;
  padding-top: 2px;
}

.step-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.step-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ============================================================
   STRENGTH GRID
   ============================================================ */
.strength-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.strength-card {
  background: var(--color-surface);
  padding: 32px 28px;
  transition: background var(--transition);
  position: relative;
}

.strength-card:hover {
  background: var(--color-surface-2);
}

.strength-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  color: var(--color-accent);
}

.strength-icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

.strength-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.strength-text {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.strength-spec {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
  margin-top: 12px;
  letter-spacing: 0.06em;
}

/* ============================================================
   ENGINEERING SECTION
   ============================================================ */
.engineering-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.advantage-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 32px;
}

.advantage-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  transition: border-color var(--transition), background var(--transition);
}

.advantage-item:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
}

.advantage-num {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  color: var(--color-border-light);
  line-height: 1;
  min-width: 44px;
  transition: color var(--transition);
}

.advantage-item:hover .advantage-num {
  color: var(--color-accent);
}

.advantage-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
  margin-bottom: 6px;
}

.advantage-text {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ============================================================
   RELIABILITY SECTION
   ============================================================ */
.reliability-section {
  position: relative;
  overflow: hidden;
}

.reliability-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-accent), transparent);
}

.reliability-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-border);
  margin-top: 48px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.reliability-card {
  background: var(--color-bg);
  padding: 36px 28px;
  position: relative;
}

.reliability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  transition: background var(--transition);
}

.reliability-card:hover::before {
  background: var(--color-accent);
}

.reliability-number {
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 4px;
}

.reliability-unit {
  font-size: 22px;
}

.reliability-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.reliability-text {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================================
   CAPACITY / DELIVERY
   ============================================================ */
.capacity-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.capacity-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
}

.capacity-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  background: var(--color-surface);
  border-left: 3px solid var(--color-border);
  border-radius: 0 3px 3px 0;
  transition: border-color var(--transition);
}

.capacity-item:hover {
  border-left-color: var(--color-accent);
}

.capacity-icon {
  color: var(--color-accent);
  flex-shrink: 0;
}

.capacity-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.capacity-label {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
}

/* ============================================================
   QUALITY SECTION
   ============================================================ */
.quality-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 64px;
  align-items: start;
}

.quality-checks {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.quality-check {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.check-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent-dim);
  border: 1px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.check-icon svg {
  width: 14px;
  height: 14px;
  fill: var(--color-accent);
}

.check-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.check-text {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.quality-certifications {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 32px;
}

.cert-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.cert-item:last-child {
  border-bottom: none;
}

.cert-badge {
  width: 44px;
  height: 44px;
  background: var(--color-accent-dim);
  border: 1px solid var(--color-accent);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  text-align: center;
  flex-shrink: 0;
  line-height: 1.2;
}

.cert-name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.cert-desc {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ============================================================
   IDEAL CLIENT SECTION
   ============================================================ */
.client-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.client-card {
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 36px 28px;
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.client-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.client-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.client-card:hover::after {
  transform: scaleX(1);
}

.client-icon {
  font-size: 36px;
  margin-bottom: 20px;
}

.client-type {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}

.client-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.client-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

/* ============================================================
   FINAL CTA SECTION
   ============================================================ */
.final-cta {
  text-align: center;
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 50% 50%, rgba(173, 14, 14, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.final-cta .section-title {
  font-size: clamp(40px, 7vw, 80px);
  margin-bottom: 16px;
}

.final-cta .section-subtitle {
  max-width: 520px;
  margin: 0 auto 40px;
}

.final-cta .btn-group {
  justify-content: center;
}

/* ============================================================
   CAPABILITIES PAGE
   ============================================================ */
.page-hero {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--color-border);
}

.page-hero-title {
  font-family: var(--font-display);
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 0.95;
  color: var(--color-text-primary);
}

.page-hero-title .accent {
  color: var(--color-accent);
}

.page-hero-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin-top: 24px;
  line-height: 1.75;
}

/* Capability blocks */
.capability-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 80px 0;
  border-bottom: 1px solid var(--color-border);
}

.capability-block:last-child {
  border-bottom: none;
}

.capability-block.reverse {
  direction: rtl;
}

.capability-block.reverse > * {
  direction: ltr;
}

.capability-number {
  font-family: var(--font-display);
  font-size: 96px;
  font-weight: 800;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: -20px;
}

.capability-title {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  margin-bottom: 16px;
}

.capability-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
}

.spec-table tr {
  border-bottom: 1px solid var(--color-border);
}

.spec-table tr:last-child {
  border-bottom: none;
}

.spec-table td {
  padding: 10px 0;
  font-size: 13px;
}

.spec-table td:first-child {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  width: 40%;
}

.spec-table td:last-child {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.capability-image {
  aspect-ratio: 4/3;
  border-radius: 3px;
  overflow: hidden;
}

/* ============================================================
   QUALITY PAGE
   ============================================================ */
.flow-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 48px;
  position: relative;
}

.flow-steps::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-border);
}

.flow-step {
  display: flex;
  gap: 32px;
  padding: 32px 0 32px 0;
  position: relative;
}

.flow-dot {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
  transition: border-color var(--transition), background var(--transition);
}

.flow-step:hover .flow-dot {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
}

.flow-dot span {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
}

.flow-step:hover .flow-dot span {
  color: var(--color-accent);
}

.flow-content {
  padding-top: 8px;
  flex: 1;
}

.flow-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
  margin-bottom: 8px;
}

.flow-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.flow-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 32px;
}

.value-card {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: var(--color-surface);
}

.value-card .icon {
  font-size: 28px;
  margin-bottom: 12px;
}

.value-card .title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: 6px;
}

.value-card .text {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 80px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-info-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent-dim);
  border: 1px solid var(--color-accent);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-accent);
}

.contact-info-icon svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.contact-info-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.contact-info-value {
  font-size: 15px;
  color: var(--color-text-primary);
  font-weight: 500;
}

/* RFQ Form */
.rfq-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--color-text-primary);
  transition: border-color var(--transition), background var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent);
  background: var(--color-surface-2);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.file-upload-area {
  border: 2px dashed var(--color-border);
  border-radius: 3px;
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.file-upload-area:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-dim);
}

.file-upload-icon {
  font-size: 32px;
  margin-bottom: 8px;
}

.file-upload-text {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

.file-upload-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Form row */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border);
}

.footer-brand .logo-text .name {
  font-size: 16px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-top: 16px;
  max-width: 280px;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 13px;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.footer-iso {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-iso-badge {
  background: var(--color-accent-dim);
  border: 1px solid var(--color-accent);
  padding: 4px 10px;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-accent);
  letter-spacing: 0.1em;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  :root {
    --section-pad: 72px;
    --container-pad: 32px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-content {
    padding: 64px var(--container-pad);
  }

  .hero-visual {
    min-height: 380px;
  }

  .hero-image-wrap::after {
    display: none;
  }

  .what-we-do,
  .engineering-grid,
  .capacity-split,
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .strength-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .reliability-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .quality-grid {
    grid-template-columns: 1fr;
  }

  .capability-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .capability-block.reverse {
    direction: ltr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-pad: 56px;
    --container-pad: 20px;
  }

  .main-nav,
  .lang-switcher {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 16px var(--container-pad);
    gap: 4px;
  }

  .main-nav.open + .lang-switcher {
    display: flex;
    position: absolute;
    top: 68px;
    right: var(--container-pad);
    /* adjust as needed */
  }

  .hero-stats {
    gap: 20px;
  }

  .strength-grid,
  .reliability-grid {
    grid-template-columns: 1fr;
  }

  .client-grid {
    grid-template-columns: 1fr;
  }

  .about-values {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: none;
}

/* Stagger children */
.stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger.visible > *:nth-child(1) { opacity: 1; transform: none; transition-delay: 0s; }
.stagger.visible > *:nth-child(2) { opacity: 1; transform: none; transition-delay: 0.08s; }
.stagger.visible > *:nth-child(3) { opacity: 1; transform: none; transition-delay: 0.16s; }
.stagger.visible > *:nth-child(4) { opacity: 1; transform: none; transition-delay: 0.24s; }
.stagger.visible > *:nth-child(5) { opacity: 1; transform: none; transition-delay: 0.32s; }
.stagger.visible > *:nth-child(6) { opacity: 1; transform: none; transition-delay: 0.40s; }

/* ============================================================
   KNOWLEDGE SECTION
   ============================================================ */

/* Breadcrumb */
.knowledge-breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.knowledge-breadcrumb a {
  color: var(--color-accent);
  transition: opacity var(--transition);
}

.knowledge-breadcrumb a:hover {
  opacity: 0.8;
}

/* Knowledge index grid */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.knowledge-card {
  background: var(--color-surface);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background var(--transition);
  text-decoration: none;
  color: inherit;
}

.knowledge-card:hover {
  background: var(--color-surface-2);
}

.knowledge-card-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.knowledge-card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  line-height: 1.15;
}

.knowledge-card-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  flex: 1;
}

.knowledge-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.knowledge-card-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-top: 8px;
}

/* Homepage / capabilities teaser grid */
.knowledge-teaser-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.knowledge-teaser-card {
  background: var(--color-surface);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--transition);
  text-decoration: none;
  color: inherit;
}

.knowledge-teaser-card:hover {
  background: var(--color-surface-2);
}

.knowledge-teaser-card--all {
  border-left: 2px solid var(--color-border-light);
}

.knowledge-teaser-card--all:hover {
  border-left-color: var(--color-accent);
}

.knowledge-teaser-card--all .knowledge-card-title {
  color: var(--color-accent);
}

/* Knowledge body (article content area) */
.knowledge-body {
  max-width: 860px;
}

.knowledge-body h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  margin: 48px 0 16px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}

.knowledge-body h2:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.knowledge-body h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-primary);
  margin: 32px 0 12px;
}

.knowledge-body p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
  max-width: 720px;
}

.knowledge-body strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

.knowledge-body em {
  color: var(--color-text-secondary);
  font-style: italic;
}

/* Knowledge tables (extends .spec-table) */
.knowledge-table {
  width: 100%;
  margin: 24px 0 32px;
}

.knowledge-table thead tr {
  border-bottom: 2px solid var(--color-border-light);
}

.knowledge-table thead td,
.knowledge-table th {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 10px 0;
  font-weight: 500;
}

.knowledge-table tbody tr:hover {
  background: var(--color-surface);
}

.knowledge-table td {
  padding: 11px 0;
  font-size: 13px;
  color: var(--color-text-secondary);
  vertical-align: top;
}

.knowledge-table td:first-child {
  color: var(--color-text-primary);
  font-weight: 500;
  width: 28%;
  padding-right: 16px;
}

/* Two-column definition layout */
.knowledge-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  margin: 24px 0;
}

.knowledge-def-block {
  background: var(--color-surface);
  padding: 28px 24px;
}

.knowledge-def-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.knowledge-def-block p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

/* Knowledge lists */
.knowledge-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.knowledge-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  padding-left: 20px;
  position: relative;
}

.knowledge-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.knowledge-list--ordered {
  counter-reset: kl;
}

.knowledge-list--ordered li {
  counter-increment: kl;
}

.knowledge-list--ordered li::before {
  content: counter(kl) '.';
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
}

/* DFM rule blocks */
.knowledge-rule {
  display: flex;
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: flex-start;
}

.knowledge-rule:last-of-type {
  border-bottom: none;
}

.knowledge-rule-num {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  color: var(--color-border-light);
  line-height: 1;
  min-width: 52px;
  padding-top: 2px;
  flex-shrink: 0;
}

.knowledge-rule-content {
  flex: 1;
}

.knowledge-rule-content h3 {
  margin: 0 0 10px;
  padding-top: 4px;
}

.knowledge-rule-spec {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

/* Note box */
.knowledge-note {
  background: var(--color-surface);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 3px 3px 0;
  padding: 16px 20px;
  margin: 16px 0 24px;
}

.knowledge-note p {
  margin: 0;
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* Related section */
.knowledge-related {
  max-width: 860px;
}

.knowledge-related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 24px;
}

.knowledge-related-card {
  background: var(--color-surface);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  transition: background var(--transition);
}

.knowledge-related-card:hover {
  background: var(--color-surface-2);
}

.knowledge-related-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.knowledge-related-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  line-height: 1.2;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .knowledge-grid {
    grid-template-columns: 1fr;
  }
  .knowledge-teaser-grid {
    grid-template-columns: 1fr;
  }
  .knowledge-two-col {
    grid-template-columns: 1fr;
  }
  .knowledge-related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .knowledge-rule {
    flex-direction: column;
    gap: 8px;
  }
  .knowledge-rule-num {
    font-size: 24px;
    min-width: auto;
  }
}