/* ============================================================
   铝泰铝业 LVTAI ALUMINUM — Industrial-Luxe Design System
   1. Font Face
   2. CSS Reset
   3. Design Tokens (Variables)
   4. Base Typography
   5. Layout Utilities
   6. Buttons
   7. Topbar & Header
   8. Hero
   9. Section Header
   10. Cards (Product/Application/News)
   11. Components (Stats, Process, Timeline, Certs)
   12. Footer
   13. Page-Specific Sections
   14. Animations
   15. Responsive
   ============================================================ */

/* --- 1. FONT FACE --- */
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/NotoSansSC-Regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/NotoSansSC-Bold.woff2') format('woff2');
}
@font-face {
  font-family: 'Saira Semi Condensed';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/SairaSemiCondensed-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Saira Semi Condensed';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/SairaSemiCondensed-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Saira Semi Condensed';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/SairaSemiCondensed-600.woff2') format('woff2');
}
@font-face {
  font-family: 'Saira Semi Condensed';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/SairaSemiCondensed-700.woff2') format('woff2');
}
@font-face {
  font-family: 'Saira Semi Condensed';
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url('../fonts/SairaSemiCondensed-800.woff2') format('woff2');
}
@font-face {
  font-family: 'Saira Semi Condensed';
  font-style: normal;
  font-weight: 900;
  font-display: swap;
  src: url('../fonts/SairaSemiCondensed-900.woff2') format('woff2');
}

/* --- 2. CSS RESET --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; scroll-behavior: smooth; }
body { min-height: 100vh; line-height: 1.6; font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif; color: var(--color-text); background: var(--color-bg); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; overflow-x: hidden; }
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }

/* --- 3. DESIGN TOKENS --- */
:root {
  /* Color - Core */
  --color-bg: #ffffff;
  --color-bg-soft: #f5f5f7;
  --color-bg-dark: #0a0a0a;
  --color-surface: #18181b;
  --color-surface-2: #27272a;

  /* Text */
  --color-text: #18181b;
  --color-text-muted: #6b7280;
  --color-text-soft: #9ca3af;
  --color-text-light: #f8fafc;
  --color-text-light-muted: #9ca3af;

  /* Aluminum tones */
  --color-aluminum-light: #e8eaed;
  --color-aluminum: #c8ccd2;
  --color-aluminum-dark: #6b7280;

  /* Accent (molten aluminum amber) */
  --color-accent: #ea580c;
  --color-accent-bright: #f59e0b;
  --color-accent-soft: #fed7aa;
  --color-accent-dark: #c2410c;

  /* Borders / lines */
  --color-line: #e4e4e7;
  --color-line-dark: #3f3f46;

  /* Typography */
  --font-display: 'Saira Semi Condensed', 'Inter', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* Spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 80px;
  --space-10: 120px;

  /* Container */
  --container-max: 1280px;
  --container-pad: 32px;

  /* Effects */
  --radius-sm: 2px;
  --radius: 4px;
  --radius-md: 6px;
  --radius-lg: 12px;
  --shadow-1: 0 1px 2px rgba(24, 24, 27, 0.05);
  --shadow-2: 0 4px 16px rgba(24, 24, 27, 0.08);
  --shadow-3: 0 12px 32px rgba(24, 24, 27, 0.12);
  --shadow-dark: 0 20px 60px rgba(0, 0, 0, 0.5);

  /* Transitions */
  --t-fast: 0.15s ease;
  --t: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  /* Type */
  --fs-mono: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 2rem;
  --fs-3xl: 2.5rem;
  --fs-4xl: 3.5rem;
  --fs-5xl: 5rem;
}

/* --- 4. BASE TYPOGRAPHY --- */
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.2; color: var(--color-text); }
h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }
p { color: var(--color-text-muted); }
.font-display { font-family: var(--font-display); letter-spacing: 0.02em; }
.font-mono { font-family: var(--font-display); font-variant-numeric: tabular-nums; letter-spacing: 0.05em; }

/* Engineering-style label */
.label-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.label-eyebrow::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--color-accent);
}

/* --- 5. LAYOUT UTILITIES --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}
.container-wide { max-width: 1440px; }
.container-narrow { max-width: 960px; }
.section { padding: var(--space-10) 0; position: relative; }
.section-sm { padding: var(--space-9) 0; }
.section-dark { background: var(--color-bg-dark); color: var(--color-text-light); }
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 { color: var(--color-text-light); }
.section-dark p { color: var(--color-text-light-muted); }
.section-soft { background: var(--color-bg-soft); }

.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.text-center { text-align: center; }
.text-right { text-align: right; }
.hidden { display: none !important; }

/* --- 6. BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--t);
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(234, 88, 12, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-line);
}
.btn-outline:hover {
  border-color: var(--color-text);
  background: var(--color-text);
  color: #fff;
}
.btn-outline-light {
  background: transparent;
  color: var(--color-text-light);
  border-color: rgba(255, 255, 255, 0.25);
}
.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}
.btn-lg { padding: 18px 36px; font-size: 1rem; }
.btn-sm { padding: 10px 18px; font-size: 0.75rem; }
.btn .arrow { transition: transform var(--t); }
.btn:hover .arrow { transform: translateX(4px); }

/* --- 7. TOPBAR & HEADER --- */
.topbar {
  background: var(--color-bg-dark);
  color: var(--color-text-light-muted);
  font-size: var(--fs-sm);
  border-bottom: 1px solid var(--color-line-dark);
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  gap: var(--space-5);
}
.topbar-welcome {
  font-family: var(--font-display);
  letter-spacing: 0.04em;
  font-size: 0.8125rem;
}
.topbar-welcome::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  margin-right: 10px;
  vertical-align: middle;
  animation: pulse 2s ease-in-out infinite;
}
.topbar-contact {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}
.topbar-item { display: inline-flex; align-items: center; gap: 6px; }
.topbar-item .icon { width: 14px; height: 14px; color: var(--color-accent); }
.topbar-divider { color: var(--color-line-dark); }

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
  transition: all var(--t);
}
.header.scrolled {
  box-shadow: var(--shadow-2);
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  gap: var(--space-6);
}
.logo { display: flex; align-items: center; flex-shrink: 0; }
.logo img { height: 44px; width: auto; }
.nav { flex: 1; display: flex; justify-content: center; }
.nav-list {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--t);
}
.nav-link::before {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: all var(--t);
  transform: translateX(-50%);
}
.nav-link:hover, .nav-link.active { color: var(--color-accent); }
.nav-link:hover::before, .nav-link.active::before { width: 24px; }
.nav-cta { flex-shrink: 0; }
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--t);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 320px;
  max-width: 85vw;
  height: 100vh;
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  z-index: 200;
  padding: 80px 32px 40px;
  transition: right var(--t-slow);
  overflow-y: auto;
  border-left: 1px solid var(--color-line-dark);
}
.mobile-menu.open { right: 0; }
.mobile-menu .nav-link {
  display: block;
  padding: 16px 0;
  color: var(--color-text-light);
  border-bottom: 1px solid var(--color-line-dark);
  font-size: 1.125rem;
}
.mobile-menu .nav-link::before { display: none; }
.mobile-menu .nav-link.active { color: var(--color-accent); }
.mobile-menu-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 1.5rem;
}
.menu-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t);
}
.menu-backdrop.show { opacity: 1; pointer-events: auto; }

/* --- 8. HERO --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: 120px 0 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.55) contrast(1.05);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(10, 10, 10, 0.92) 0%, rgba(10, 10, 10, 0.4) 50%, rgba(10, 10, 10, 0.7) 100%),
    radial-gradient(ellipse at top right, rgba(234, 88, 12, 0.25), transparent 60%);
  z-index: 1;
}
/* Grid overlay for industrial drawing feel */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  z-index: 1;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-8);
  align-items: center;
}
.hero-text { max-width: 720px; }
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: rgba(234, 88, 12, 0.15);
  border: 1px solid rgba(234, 88, 12, 0.4);
  color: var(--color-accent-bright);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border-radius: 999px;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 24px;
  font-family: var(--font-body);
}
.hero-title .accent { color: var(--color-accent-bright); }
.hero-title .display { font-family: var(--font-display); font-weight: 800; letter-spacing: 0.01em; }
.hero-desc {
  font-size: 1.125rem;
  color: rgba(248, 250, 252, 0.8);
  margin-bottom: 36px;
  max-width: 580px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}
.hero-stat .stat-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent-bright);
  line-height: 1;
  letter-spacing: 0.01em;
}
.hero-stat .stat-unit { color: var(--color-text-light-muted); font-size: 1rem; margin-left: 4px; }
.hero-stat .stat-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-light-muted);
  letter-spacing: 0.05em;
  margin-top: 8px;
}

/* Hero side panel - spec sheet */
.hero-spec {
  background: rgba(24, 24, 27, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 32px;
  position: relative;
}
.hero-spec::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 40px;
  height: 40px;
  border-top: 2px solid var(--color-accent);
  border-left: 2px solid var(--color-accent);
}
.hero-spec::after {
  content: "";
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 40px;
  height: 40px;
  border-bottom: 2px solid var(--color-accent);
  border-right: 2px solid var(--color-accent);
}
.hero-spec-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent-bright);
  margin-bottom: 24px;
}
.hero-spec h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  line-height: 1.3;
}
.hero-spec-list { display: flex; flex-direction: column; gap: 14px; }
.hero-spec-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
}
.hero-spec-item:last-child { border-bottom: none; padding-bottom: 0; }
.hero-spec-key {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  color: var(--color-text-light-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero-spec-val {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.hero-spec-val .unit {
  font-size: 0.75rem;
  color: var(--color-text-light-muted);
  margin-left: 4px;
  font-weight: 500;
}

/* Scroll cue */
.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-light-muted);
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.hero-scroll .line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  position: relative;
  overflow: hidden;
}
.hero-scroll .line::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 30%;
  background: var(--color-accent-bright);
  animation: scrollDown 2s ease-in-out infinite;
}

/* --- 9. SECTION HEADER --- */
.section-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-6);
  align-items: end;
  margin-bottom: var(--space-8);
}
.section-head-center {
  grid-template-columns: 1fr;
  text-align: center;
  justify-items: center;
}
.section-index {
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 800;
  line-height: 0.9;
  color: var(--color-bg-soft);
  letter-spacing: -0.02em;
  position: relative;
  user-select: none;
}
.section-dark .section-index { color: rgba(255, 255, 255, 0.06); }
.section-index::after {
  content: "";
  position: absolute;
  bottom: 12px;
  right: -12px;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}
.section-head-main { display: flex; flex-direction: column; gap: 12px; }
.section-head-main .label-eyebrow { margin-bottom: 0; }
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.section-title .accent { color: var(--color-accent); }
.section-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 600px;
}
.section-dark .section-desc { color: var(--color-text-light-muted); }
.section-head-cta { display: flex; align-items: end; }

/* --- 10. CARDS --- */

/* Product card */
.product-card {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  transition: all var(--t);
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  border-color: var(--color-text);
  transform: translateY(-4px);
  box-shadow: var(--shadow-3);
}
.product-card-image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-soft);
}
.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow);
}
.product-card:hover .product-card-image img { transform: scale(1.05); }
.product-card-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 4px 10px;
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.product-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}
.product-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}
.product-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}
.product-card-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}
.product-card-spec {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: var(--color-bg-soft);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}
.product-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
}
.product-card:hover .product-card-link { color: var(--color-accent); }
.product-card-link .arrow { transition: transform var(--t); }
.product-card:hover .product-card-link .arrow { transform: translateX(4px); }

/* Application card */
.app-card {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-dark);
  color: var(--color-text-light);
}
.app-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.55);
  transition: all var(--t-slow);
}
.app-card:hover img { filter: brightness(0.7); transform: scale(1.05); }
.app-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10, 10, 10, 0.95) 0%, rgba(10, 10, 10, 0.4) 50%, transparent 100%);
}
.app-card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 32px;
  z-index: 2;
}
.app-card-index {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-accent-bright);
  margin-bottom: 8px;
}
.app-card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}
.app-card-desc { font-size: 0.875rem; color: rgba(248, 250, 252, 0.8); }

/* News card */
.news-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  transition: all var(--t);
  overflow: hidden;
}
.news-card:hover {
  border-color: var(--color-text);
  box-shadow: var(--shadow-2);
}
.news-card-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg-soft);
}
.news-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--t-slow); }
.news-card:hover .news-card-image img { transform: scale(1.05); }
.news-card-body { padding: 24px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.news-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}
.news-card-date {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-weight: 600;
}
.news-card-cat {
  padding: 3px 10px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  text-transform: uppercase;
}
.news-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-text);
  transition: color var(--t);
}
.news-card:hover .news-card-title { color: var(--color-accent); }
.news-card-excerpt { font-size: 0.875rem; color: var(--color-text-muted); line-height: 1.6; flex: 1; }
.news-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-top: 8px;
}
.news-card:hover .news-card-link { color: var(--color-accent); }

/* --- 11. COMPONENTS --- */

/* Stats counter */
.stat-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 0;
  border-left: 1px solid var(--color-line);
  padding-left: 24px;
}
.section-dark .stat-block { border-color: var(--color-line-dark); }
.stat-num-big {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.section-dark .stat-num-big { color: var(--color-accent-bright); }
.stat-num-big .unit { font-size: 1.25rem; color: var(--color-text-muted); margin-left: 6px; font-weight: 600; }
.section-dark .stat-num-big .unit { color: var(--color-text-light-muted); }
.stat-label-big { font-size: 0.875rem; color: var(--color-text-muted); letter-spacing: 0.05em; }
.section-dark .stat-label-big { color: var(--color-text-light-muted); }

/* Feature card */
.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  padding: 32px;
  transition: all var(--t);
  position: relative;
  overflow: hidden;
}
.feature-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-soft);
  color: var(--color-accent);
  margin-bottom: 20px;
  border: 1px solid var(--color-line);
}
.feature-icon svg { width: 28px; height: 28px; }
.feature-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 0.9375rem; line-height: 1.6; }
.feature-num {
  position: absolute;
  top: 24px;
  right: 24px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-soft);
  letter-spacing: 0.05em;
}

/* Process / timeline */
.process {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  position: relative;
}
.process::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 5%;
  right: 5%;
  height: 1px;
  background: var(--color-line);
}
.process-step {
  text-align: center;
  padding: 0 12px;
  position: relative;
}
.process-step-num {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text);
  position: relative;
  z-index: 2;
  transition: all var(--t);
}
.process-step:hover .process-step-num {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #fff;
  transform: scale(1.08);
}
.process-step h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.process-step p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Timeline (vertical) */
.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 8px;
  width: 1px;
  background: var(--color-line);
}
.timeline-item {
  position: relative;
  padding-bottom: 40px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  top: 4px;
  left: -40px;
  width: 17px;
  height: 17px;
  background: var(--color-bg);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  z-index: 2;
}
.timeline-year {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}
.timeline-title { font-size: 1.0625rem; font-weight: 700; margin-bottom: 6px; }
.timeline-desc { font-size: 0.875rem; color: var(--color-text-muted); line-height: 1.6; }

/* Spec table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}
.spec-table tr { border-bottom: 1px solid var(--color-line); }
.spec-table th, .spec-table td {
  text-align: left;
  padding: 14px 16px;
  vertical-align: top;
}
.spec-table th {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: var(--color-bg-soft);
  width: 200px;
}
.spec-table td { color: var(--color-text); }
.spec-table tr:hover td { background: rgba(245, 245, 247, 0.6); }

/* Certifications */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.cert-item {
  background: var(--color-bg-soft);
  padding: 24px;
  text-align: center;
  border: 1px solid var(--color-line);
  transition: all var(--t);
}
.cert-item:hover {
  background: var(--color-bg);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.cert-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  background: var(--color-bg);
}
.cert-name { font-weight: 700; font-size: 0.9375rem; margin-bottom: 4px; }
.cert-num { font-family: var(--font-display); font-size: 0.75rem; color: var(--color-text-muted); letter-spacing: 0.04em; }

/* Partner marquee */
.partner-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}
.partner-item {
  flex: 1;
  min-width: 200px;
  padding: 24px 32px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-right: 1px solid var(--color-line);
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  transition: color var(--t);
}
.partner-item:last-child { border-right: none; }
.partner-item:hover { color: var(--color-accent); }
.partner-item .partner-mark {
  width: 32px;
  height: 32px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--color-accent);
}

/* Image feature */
.image-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}
.image-feature.reverse .image-feature-image { order: 2; }
.image-feature-image {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.image-feature-image img { width: 100%; height: 100%; object-fit: cover; }
.image-feature-image::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.15);
  pointer-events: none;
}

/* --- 12. FOOTER --- */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-light-muted);
  padding: 80px 0 0;
  border-top: 1px solid var(--color-line-dark);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-7);
  padding-bottom: 60px;
  border-bottom: 1px solid var(--color-line-dark);
}
.footer-brand img { height: 50px; margin-bottom: 24px; }
.footer-brand p { font-size: 0.875rem; line-height: 1.7; margin-bottom: 24px; max-width: 360px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line-dark);
  color: var(--color-text-light-muted);
  transition: all var(--t);
}
.footer-social a:hover { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }
.footer-col h4 {
  color: var(--color-text-light);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}
.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}
.footer-links { display: flex; flex-direction: column; gap: 12px; }
.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-light-muted);
  transition: all var(--t);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.footer-links a::before {
  content: "→";
  font-family: var(--font-display);
  color: var(--color-accent);
  opacity: 0;
  transform: translateX(-6px);
  transition: all var(--t);
}
.footer-links a:hover { color: var(--color-text-light); }
.footer-links a:hover::before { opacity: 1; transform: translateX(0); }
.footer-contact-item {
  display: flex;
  gap: 12px;
  font-size: 0.875rem;
  margin-bottom: 14px;
  line-height: 1.6;
}
.footer-contact-item .icon {
  width: 16px;
  height: 16px;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 3px;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  font-size: 0.8125rem;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a:hover { color: var(--color-text-light); }

/* --- 13. PAGE-SPECIFIC --- */

/* Page hero (sub pages) */
.page-hero {
  position: relative;
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  padding: 160px 0 80px;
  overflow: hidden;
}
.page-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.4);
  z-index: 0;
}
.page-hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(10, 10, 10, 0.85) 0%, rgba(10, 10, 10, 0.5) 100%),
    radial-gradient(ellipse at top right, rgba(234, 88, 12, 0.2), transparent 60%);
  z-index: 1;
}
.page-hero-content { position: relative; z-index: 2; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--color-text-light-muted);
  margin-bottom: 24px;
  text-transform: uppercase;
}
.breadcrumb a:hover { color: var(--color-accent-bright); }
.breadcrumb .sep { color: var(--color-text-soft); }
.page-hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.05;
  margin-bottom: 20px;
}
.page-hero h1 .accent { color: var(--color-accent-bright); }
.page-hero-desc {
  font-size: 1.125rem;
  color: rgba(248, 250, 252, 0.75);
  max-width: 620px;
  line-height: 1.7;
}

/* Contact page */
.contact-block {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  padding: 32px;
  height: 100%;
  transition: all var(--t);
}
.contact-block:hover { border-color: var(--color-accent); }
.contact-block-icon {
  width: 56px;
  height: 56px;
  background: var(--color-bg-soft);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.contact-block h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 16px; }
.contact-block-item {
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-line);
  font-size: 0.9375rem;
}
.contact-block-item:last-child { border-bottom: none; }
.contact-block-item .key {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
  display: block;
}
.contact-block-item .val { color: var(--color-text); font-weight: 500; }

.map-embed {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-line);
  position: relative;
  overflow: hidden;
}
.map-embed iframe { width: 100%; height: 100%; border: 0; }

/* News filter */
.news-filter {
  display: flex;
  gap: 8px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.news-filter button {
  padding: 8px 18px;
  border: 1px solid var(--color-line);
  background: var(--color-bg);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: all var(--t);
}
.news-filter button:hover, .news-filter button.active {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}

/* Pagination */
.pagination {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-top: 60px;
}
.pagination a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--t);
}
.pagination a:hover, .pagination a.active {
  background: var(--color-text);
  color: #fff;
  border-color: var(--color-text);
}

/* Product detail layout */
.product-detail-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-8);
  align-items: start;
}
.product-detail-image {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-soft);
  overflow: hidden;
  border: 1px solid var(--color-line);
}
.product-detail-image img { width: 100%; height: 100%; object-fit: cover; }

/* CTA strip */
.cta-strip {
  background: var(--color-surface);
  color: var(--color-text-light);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}
.cta-strip::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}
.cta-strip-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-strip h2 { color: #fff; font-size: 2rem; margin-bottom: 8px; }
.cta-strip p { color: var(--color-text-light-muted); }

/* About page gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.gallery-item {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-soft);
}
.gallery-item.tall { grid-row: span 2; aspect-ratio: 4 / 7; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--t-slow); }
.gallery-item:hover img { transform: scale(1.05); }

/* --- 14. ANIMATIONS --- */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
@keyframes scrollDown {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(330%); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Reveal-on-scroll */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* Hero stagger */
.hero-text > * { animation: fadeUp 0.8s ease backwards; }
.hero-text > *:nth-child(1) { animation-delay: 0.1s; }
.hero-text > *:nth-child(2) { animation-delay: 0.2s; }
.hero-text > *:nth-child(3) { animation-delay: 0.3s; }
.hero-text > *:nth-child(4) { animation-delay: 0.4s; }
.hero-text > *:nth-child(5) { animation-delay: 0.5s; }
.hero-spec { animation: fadeUp 0.8s ease 0.5s backwards; }

/* --- 15. RESPONSIVE --- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-spec { max-width: 480px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .process { grid-template-columns: repeat(3, 1fr); gap: 30px 0; }
  .process::before { display: none; }
  .image-feature { grid-template-columns: 1fr; gap: 32px; }
  .image-feature.reverse .image-feature-image { order: 0; }
  .product-detail-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-item.tall { grid-row: span 1; aspect-ratio: 4 / 3; }
}

@media (max-width: 768px) {
  :root {
    --space-10: 80px;
    --space-9: 60px;
    --container-pad: 20px;
  }
  .nav, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .topbar-welcome { display: none; }
  .topbar-contact { font-size: 0.75rem; gap: 10px; }
  .section-head { grid-template-columns: 1fr; gap: 16px; }
  .section-head-cta { display: none; }
  .section-index { font-size: 3.5rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-3.cards-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .hero { padding: 100px 0 60px; }
  .hero-scroll { display: none; }
  .footer-top { grid-template-columns: 1fr; gap: 40px; padding-bottom: 40px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-item { min-width: 50%; }
  .partner-item:nth-child(odd) { border-right: 1px solid var(--color-line); }
  .partner-item:nth-child(even) { border-right: none; }
  .cta-strip-inner { flex-direction: column; align-items: flex-start; }
  .gallery-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { width: 100%; }
  .news-filter { overflow-x: auto; flex-wrap: nowrap; }
  .news-filter button { white-space: nowrap; }
  .pagination a { width: 36px; height: 36px; font-size: 0.8125rem; }
}

/* Print */
@media print {
  .header, .topbar, .footer, .nav-toggle, .mobile-menu, .menu-backdrop { display: none; }
  body { color: #000; background: #fff; }
}