/* ===== CSS Variables ===== */
:root {
  --bg-primary: #060608;
  --bg-secondary: #0c0d13;
  --bg-card: #11131a;
  --bg-card-hover: #181b24;
  --text-primary: #ebe4d8;
  --text-secondary: #9d9689;
  --text-muted: #6b655b;
  --accent: #c9a96e;
  --accent-light: #e0c78a;
  --accent-dim: #8c7348;
  --accent-glow: rgba(201, 169, 110, 0.25);
  --accent-subtle: rgba(201, 169, 110, 0.06);
  --gradient-gold: linear-gradient(135deg, #c9a96e 0%, #e0c78a 50%, #b8944f 100%);
  --gradient-warm: linear-gradient(135deg, #c9a96e, #a8864a);
  --gradient-dark: linear-gradient(180deg, #060608 0%, #0c0d13 100%);
  --border: rgba(201, 169, 110, 0.08);
  --border-hover: rgba(201, 169, 110, 0.2);
  --border-bright: rgba(201, 169, 110, 0.35);
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.35s cubic-bezier(0.25, 0, 0.15, 1);
  --transition-slow: 0.6s cubic-bezier(0.25, 0, 0.15, 1);
  --font-display: 'Noto Serif SC', 'Source Han Serif SC', 'STSong', 'SimSun', 'Songti SC', serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'STHeiti', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', 'Consolas', monospace;
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
  opacity: 0.015;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
}

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

ul { list-style: none; }
img { max-width: 100%; display: block; }

::selection {
  background: rgba(201, 169, 110, 0.3);
  color: var(--text-primary);
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-dim);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ===== Typography ===== */
.section-title {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  font-weight: 400;
}

.gradient-text {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Dot Grid Background (shared) ===== */
.bg-dots {
  position: relative;
}

.bg-dots::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(201, 169, 110, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 0;
}

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
  background: rgba(6, 6, 8, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08);
}

.header.scrolled {
  padding: 12px 0;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1001;
}

.logo-icon-wrap {
  width: 40px;
  height: 42px;
  overflow: hidden;
  display: block;
  flex-shrink: 0;
}

.logo-icon {
  display: block;
  width: 44px;
  height: 45px;
  border: 0;
  outline: none;
}

.logo:hover .logo-icon {
  filter: drop-shadow(0 0 18px var(--accent-glow));
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-light);
  letter-spacing: 0.06em;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
  letter-spacing: 0.03em;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--gradient-gold);
  transition: width var(--transition);
  border-radius: 1px;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

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

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-body);
  letter-spacing: 0.03em;
}

.btn-primary {
  background: var(--gradient-gold);
  color: #1a1508;
  box-shadow: 0 4px 24px rgba(201, 169, 110, 0.2);
}

.btn-primary:hover {
  box-shadow: 0 8px 36px rgba(201, 169, 110, 0.35);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(201, 169, 110, 0.25);
  color: var(--text-primary);
}

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

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 140px 0 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 80vw;
  height: 80vw;
  background: radial-gradient(ellipse at center, rgba(201, 169, 110, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, transparent 0%, rgba(6, 6, 8, 0.6) 40%, rgba(6, 6, 8, 0.92) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
}

.hero-left {
  flex: 1;
  text-align: left;
}

.hero-right {
  flex-shrink: 0;
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 56px;
}

.hero-title {
  margin-bottom: 40px;
  display: flex;
  flex-direction: column;
  gap: 0.4em;
}

.hero-title-main {
  font-family: var(--font-display);
  font-size: 3.8rem;
  font-weight: 900;
  letter-spacing: 0.3em;
  line-height: 1;
  color: var(--text-primary);
}

.hero-title-sub {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.25;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 40px;
  max-width: 520px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.stat-text {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-label {
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.04em;
}

/* ===== Section Divider ===== */
.section-divider {
  height: 60px;
  background: var(--gradient-dark);
  position: relative;
}

.section-divider::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(201, 169, 110, 0.15), transparent);
}

/* ===== Sections ===== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Products ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-gold);
  opacity: 0;
  transition: opacity var(--transition);
}

.product-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(201, 169, 110, 0.05) inset;
}

.product-card:hover::before {
  opacity: 0.6;
}

.product-detail-abbr {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.product-detail-name {
  display: block;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
  font-family: var(--font-display);
  letter-spacing: 0.04em;
}

.product-detail-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.product-detail-tags span {
  font-size: 0.75rem;
  padding: 4px 14px;
  border-radius: 6px;
  background: var(--accent-subtle);
  color: var(--accent-light);
  font-weight: 500;
  border: 1px solid rgba(201, 169, 110, 0.1);
  letter-spacing: 0.03em;
}

.product-detail-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== Why Algo ===== */
.why-header {
  text-align: center;
  margin-top: 88px;
  margin-bottom: 48px;
}

.why-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.why-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.why-list {
  max-width: 860px;
  margin: 0 auto;
}

.why-item {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  padding: 36px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.why-item:first-child {
  border-top: 1px solid var(--border);
}

.why-item:hover {
  border-bottom-color: var(--border-hover);
}

.why-item:first-child:hover {
  border-top-color: var(--border-hover);
}

.why-item-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border-radius: var(--radius);
  color: var(--accent-light);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.why-item:hover .why-item-icon {
  border-color: var(--border-hover);
  box-shadow: 0 0 20px var(--accent-glow);
}

.why-item-body h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
  letter-spacing: 0.03em;
}

.why-item-body p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== Algorithm ===== */
.algorithm {
  background: var(--bg-secondary);
}

.algo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px 64px;
  max-width: 1000px;
  margin: 0 auto;
}

.algo-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: var(--transition);
}

.algo-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-gold);
  opacity: 0;
  transition: opacity var(--transition);
}

.algo-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.algo-card:hover::before {
  opacity: 0.6;
}

.algo-card:nth-child(2)::before {
  content: '→';
  position: absolute;
  top: 50%;
  left: -44px;
  width: 24px;
  height: auto;
  background: none;
  text-align: center;
  transform: translateY(-50%);
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 400;
  opacity: 0.6;
  pointer-events: none;
}

.algo-card:nth-child(4)::before {
  content: '↓';
  position: absolute;
  top: -22px;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  width: 24px;
  height: auto;
  background: none;
  text-align: center;
  font-size: 1.3rem;
  line-height: 1;
  color: var(--accent);
  font-weight: 400;
  opacity: 0.6;
  pointer-events: none;
}

.algo-card:nth-child(4)::after {
  content: '←';
  position: absolute;
  top: 50%;
  left: -44px;
  width: 24px;
  text-align: center;
  transform: translateY(-50%);
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 400;
  opacity: 0.6;
  pointer-events: none;
}

.algo-card:nth-child(1)::before {
  display: none;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  line-height: 1;
  letter-spacing: 0.05em;
}

.algo-card h4 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}

.algo-keywords {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.algo-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== Industries ===== */
.industries {
  background: var(--bg-primary);
}

.industries-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.industry-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
}

.industry-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 28px;
  bottom: 28px;
  width: 1px;
  background: var(--gradient-gold);
  opacity: 0;
  transition: opacity var(--transition);
}

.industry-item:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.3);
}

.industry-item:hover::before {
  opacity: 0.6;
}

.industry-item h4 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}

.industry-item p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== About ===== */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.85;
  margin-bottom: 16px;
}

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

.about-values {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}

.value-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.value-item:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.value-item strong {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
  color: var(--accent-light);
  letter-spacing: 0.04em;
}

.value-item span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.about-contact {
  margin-top: 28px;
}

.about-contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  color: var(--accent-light);
  font-size: 0.92rem;
  transition: var(--transition);
}

.about-contact-item:hover {
  border-color: var(--border-hover);
}

.about-contact-item a {
  color: var(--accent-light);
  font-weight: 500;
}

.about-contact-item a:hover {
  text-decoration: underline;
}

.about-contact-item svg {
  flex-shrink: 0;
}

/* ===== 3D Cube ===== */
.about-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 800px;
}

.about-cube {
  width: 280px;
  height: 280px;
  position: relative;
  transform-style: preserve-3d;
  animation: cubeRotate 14s linear infinite;
  margin-left: 0;
}

@keyframes cubeRotate {
  0% { transform: rotateX(-22deg) rotateY(0deg); }
  100% { transform: rotateX(-22deg) rotateY(360deg); }
}

.cube-xl,
.cube-outer,
.cube-inner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform-style: preserve-3d;
}

.cube-xl {
  width: 280px;
  height: 280px;
  margin-left: -140px;
  margin-top: -140px;
}

.cube-outer {
  width: 186px;
  height: 186px;
  margin-left: -93px;
  margin-top: -93px;
  animation: cubeRotateOuter 18s linear infinite;
}

.cube-inner {
  width: 94px;
  height: 94px;
  margin-left: -47px;
  margin-top: -47px;
  animation: cubeRotateInner 10s linear infinite;
}

@keyframes cubeRotateOuter {
  0% { transform: rotateX(-15deg) rotateY(0deg); }
  100% { transform: rotateX(-15deg) rotateY(-360deg); }
}

@keyframes cubeRotateInner {
  0% { transform: rotateX(-28deg) rotateY(0deg); }
  100% { transform: rotateX(-28deg) rotateY(360deg); }
}

.cube-face-xl {
  position: absolute;
  width: 280px;
  height: 280px;
  border: 1px solid rgba(201, 169, 110, 0.12);
  background: rgba(201, 169, 110, 0.015);
}

.cube-face-outer {
  position: absolute;
  width: 186px;
  height: 186px;
  border: 1.5px solid rgba(201, 169, 110, 0.2);
  background: rgba(201, 169, 110, 0.025);
}

.cube-face-inner {
  position: absolute;
  width: 94px;
  height: 94px;
  border: 2px solid var(--accent);
  background: rgba(201, 169, 110, 0.05);
}

.cube-face-xl.front  { transform: translateZ(140px); }
.cube-face-xl.back   { transform: rotateY(180deg) translateZ(140px); }
.cube-face-xl.right  { transform: rotateY(90deg) translateZ(140px); }
.cube-face-xl.left   { transform: rotateY(-90deg) translateZ(140px); }
.cube-face-xl.top    { transform: rotateX(90deg) translateZ(140px); }
.cube-face-xl.bottom { transform: rotateX(-90deg) translateZ(140px); }

.cube-face-outer.front  { transform: translateZ(93px); }
.cube-face-outer.back   { transform: rotateY(180deg) translateZ(93px); }
.cube-face-outer.right  { transform: rotateY(90deg) translateZ(93px); }
.cube-face-outer.left   { transform: rotateY(-90deg) translateZ(93px); }
.cube-face-outer.top    { transform: rotateX(90deg) translateZ(93px); }
.cube-face-outer.bottom { transform: rotateX(-90deg) translateZ(93px); }

.cube-face-inner.front  { transform: translateZ(47px); }
.cube-face-inner.back   { transform: rotateY(180deg) translateZ(47px); }
.cube-face-inner.right  { transform: rotateY(90deg) translateZ(47px); }
.cube-face-inner.left   { transform: rotateY(-90deg) translateZ(47px); }
.cube-face-inner.top    { transform: rotateX(90deg) translateZ(47px); }
.cube-face-inner.bottom { transform: rotateX(-90deg) translateZ(47px); }

/* ===== Footer ===== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 48px 0 28px;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* ===== Scroll Reveal Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.25, 0, 0.15, 1),
              transform 0.7s cubic-bezier(0.25, 0, 0.15, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.product-card:nth-child(1) { transition-delay: 0s; }
.product-card:nth-child(2) { transition-delay: 0.06s; }
.product-card:nth-child(3) { transition-delay: 0.12s; }
.product-card:nth-child(4) { transition-delay: 0.04s; }
.product-card:nth-child(5) { transition-delay: 0.1s; }
.product-card:nth-child(6) { transition-delay: 0.16s; }
.product-card:nth-child(7) { transition-delay: 0.08s; }
.product-card:nth-child(8) { transition-delay: 0.14s; }
.product-card:nth-child(9) { transition-delay: 0.2s; }

.why-item:nth-child(1) { transition-delay: 0s; }
.why-item:nth-child(2) { transition-delay: 0.08s; }
.why-item:nth-child(3) { transition-delay: 0.16s; }
.why-item:nth-child(4) { transition-delay: 0.24s; }
.why-item:nth-child(5) { transition-delay: 0.32s; }

.algo-card:nth-child(1) { transition-delay: 0s; }
.algo-card:nth-child(2) { transition-delay: 0.1s; }
.algo-card:nth-child(3) { transition-delay: 0.2s; }
.algo-card:nth-child(4) { transition-delay: 0.3s; }

.industry-item:nth-child(1) { transition-delay: 0s; }
.industry-item:nth-child(2) { transition-delay: 0.07s; }
.industry-item:nth-child(3) { transition-delay: 0.14s; }
.industry-item:nth-child(4) { transition-delay: 0.05s; }
.industry-item:nth-child(5) { transition-delay: 0.12s; }
.industry-item:nth-child(6) { transition-delay: 0.19s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .about-visual {
    order: -1;
    margin-bottom: 32px;
  }

  .hero-title-main {
    font-size: 3rem;
    letter-spacing: 0.22em;
  }

  .hero-title-sub {
    font-size: 1.8rem;
  }

  .hero-stats {
    gap: 32px 44px;
  }

  .stat-text {
    font-size: 2.4rem;
  }
}

@media (max-width: 768px) {
  .hero-title-main {
    font-size: 2.2rem;
    letter-spacing: 0.2em;
  }

  .hero-title-sub {
    font-size: 1.45rem;
  }

  .hero-desc {
    font-size: 0.92rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: 100dvh;
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: safe center;
    gap: 24px;
    z-index: 10000;
    overflow-y: auto;
    padding: 40px 24px;
    list-style: none;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-link {
    font-size: 1rem;
    padding: 8px 0;
  }

  .menu-toggle {
    z-index: 10001;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-content {
    flex-direction: column;
    text-align: center;
    gap: 44px;
  }

  .hero-left {
    text-align: center;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-desc {
    max-width: 100%;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
    gap: 28px 36px;
  }

  .stat-text {
    font-size: 2.2rem;
  }

  .stat-label {
    font-size: 0.95rem;
  }

  .stat-item {
    align-items: center;
  }

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

  .product-card {
    padding: 28px 24px;
  }

  .why-item {
    flex-direction: column;
    gap: 18px;
    padding: 28px 0;
  }

  .algo-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .algo-card:nth-child(3) {
    order: 2;
  }

  .algo-card:nth-child(4) {
    order: 1;
  }

  .algo-card:nth-child(2)::before,
  .algo-card:nth-child(3)::before,
  .algo-card:nth-child(4)::before {
    content: '↓';
    left: 0;
    right: 0;
    margin-left: auto;
    margin-right: auto;
    width: 24px;
    height: auto;
    background: none;
    text-align: center;
    top: -24px;
    transform: none;
    font-size: 1.3rem;
    line-height: 1;
    opacity: 0.6;
    pointer-events: none;
  }

  .algo-card:nth-child(4)::after {
    content: none;
  }

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

  .about-grid {
    gap: 36px;
  }

  .about-cube {
    width: 220px;
    height: 220px;
  }

  .cube-xl {
    width: 220px;
    height: 220px;
    margin-left: -110px;
    margin-top: -110px;
  }

  .cube-outer {
    width: 146px;
    height: 146px;
    margin-left: -73px;
    margin-top: -73px;
  }

  .cube-inner {
    width: 74px;
    height: 74px;
    margin-left: -37px;
    margin-top: -37px;
  }

  .cube-face-xl { width: 220px; height: 220px; }
  .cube-face-outer { width: 146px; height: 146px; }
  .cube-face-inner { width: 74px; height: 74px; }

  .cube-face-xl.front  { transform: translateZ(110px); }
  .cube-face-xl.back   { transform: rotateY(180deg) translateZ(110px); }
  .cube-face-xl.right  { transform: rotateY(90deg) translateZ(110px); }
  .cube-face-xl.left   { transform: rotateY(-90deg) translateZ(110px); }
  .cube-face-xl.top    { transform: rotateX(90deg) translateZ(110px); }
  .cube-face-xl.bottom { transform: rotateX(-90deg) translateZ(110px); }

  .cube-face-outer.front  { transform: translateZ(73px); }
  .cube-face-outer.back   { transform: rotateY(180deg) translateZ(73px); }
  .cube-face-outer.right  { transform: rotateY(90deg) translateZ(73px); }
  .cube-face-outer.left   { transform: rotateY(-90deg) translateZ(73px); }
  .cube-face-outer.top    { transform: rotateX(90deg) translateZ(73px); }
  .cube-face-outer.bottom { transform: rotateX(-90deg) translateZ(73px); }

  .cube-face-inner.front  { transform: translateZ(37px); }
  .cube-face-inner.back   { transform: rotateY(180deg) translateZ(37px); }
  .cube-face-inner.right  { transform: rotateY(90deg) translateZ(37px); }
  .cube-face-inner.left   { transform: rotateY(-90deg) translateZ(37px); }
  .cube-face-inner.top    { transform: rotateX(90deg) translateZ(37px); }
  .cube-face-inner.bottom { transform: rotateX(-90deg) translateZ(37px); }
}