/* =============================================
   WENSU INDUSTRIAL - Main Stylesheet
   Dark Industrial Premium Design
   ============================================= */

/* --- CSS Variables --- */
:root {
  --bg-primary: #08080d;
  --bg-secondary: #0d0d15;
  --bg-card: #111118;
  --bg-elevated: #161622;
  --text-primary: #e8e8ee;
  --text-secondary: #9090a8;
  --text-muted: #606078;
  --accent: #00c6ff;
  --accent-glow: #00c6ff55;
  --accent-dim: #00c6ff22;
  --accent2: #f0a500;
  --accent2-glow: #f0a50055;
  --border: #ffffff0d;
  --border-strong: #ffffff15;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  scroll-behavior: auto; /* GSAP ScrollTrigger handles this */
  font-size: 16px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font);
  overflow-x: hidden;
}

body {
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  cursor: none;
}

/* --- Custom Cursor --- */
.cursor {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  position: fixed;
  pointer-events: none;
  z-index: 99999;
  transform: translate(-50%, -50%);
  transition: width 0.2s, height 0.2s, background 0.2s;
  mix-blend-mode: difference;
}

.cursor-follower {
  width: 40px;
  height: 40px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  position: fixed;
  pointer-events: none;
  z-index: 99998;
  transform: translate(-50%, -50%);
  transition: 0.1s ease-out;
}

@media (max-width: 1024px) {
  .cursor, .cursor-follower { display: none; }
  body { cursor: auto; }
}

/* --- Preloader --- */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 99990;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.preloader-content {
  text-align: center;
}

.preloader-logo {
  width: 200px;
  height: auto;
  margin-bottom: 30px;
  color: var(--accent);
  animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}

.preloader-bar {
  width: 200px;
  height: 2px;
  background: var(--border-strong);
  border-radius: 1px;
  overflow: hidden;
}

.preloader-progress {
  height: 100%;
  background: var(--accent);
  border-radius: 1px;
  width: 0%;
  box-shadow: 0 0 10px var(--accent-glow);
  transition: width 0.1s linear;
}

/* --- Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 40px;
  transition: background 0.4s ease, padding 0.4s ease, box-shadow 0.4s ease;
}

.nav.scrolled {
  background: rgba(8, 8, 13, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
  padding: 0 40px;
}

.nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.nav-logo {
  width: 140px;
  color: var(--text-primary);
  transition: color 0.3s;
}

.nav-logo:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  position: relative;
  padding: 4px 0;
  transition: color 0.3s;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}

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

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

.nav-cta {
  display: inline-block;
  padding: 10px 22px;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 30px;
  transition: all 0.3s ease;
}

.nav-cta:hover {
  background: var(--accent);
  color: var(--bg-primary);
  box-shadow: 0 0 25px var(--accent-glow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

/* --- Container --- */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
}

/* --- Hero --- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at center, transparent 0%, var(--bg-primary) 100%),
    linear-gradient(180deg, var(--bg-primary) 0%, transparent 30%, transparent 70%, var(--bg-primary) 100%);
  z-index: 1;
}

.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 900px;
  padding: 0 20px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-title-line {
  display: block;
}

.hero-title-line.accent {
  color: var(--accent);
  text-shadow: 0 0 80px var(--accent-glow);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}

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

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.5); }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 40px;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  font-family: var(--font);
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  box-shadow: 0 0 30px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px var(--accent-glow);
}

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

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

.btn-full {
  width: 100%;
  justify-content: center;
}

/* --- Stats Section --- */
.stats {
  position: relative;
  padding: 0;
  margin-top: -80px;
  z-index: 10;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.stat-item {
  background: var(--bg-elevated);
  padding: 40px 24px 32px;
  text-align: center;
  transition: background 0.3s ease;
}

.stat-item:hover {
  background: var(--bg-card);
}

.stat-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.stat-number span:last-child {
  font-size: 1.5rem;
  font-weight: 600;
  margin-left: 2px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* --- Section Common --- */
section {
  padding: 120px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 80px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.accent {
  color: var(--accent);
}

/* --- Services --- */
.services {
  background: var(--bg-secondary);
}

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

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 36px;
  position: relative;
  transition: all 0.4s ease;
}

.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 198, 255, 0.08);
}

.service-card.featured {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--bg-card), var(--accent-dim));
}

.service-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 6px 16px;
  border-radius: 20px;
  white-space: nowrap;
}

.service-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 24px;
  color: var(--accent);
}

.service-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.service-card > p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}

.service-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-features li {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-left: 20px;
  position: relative;
}

.service-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

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

.about-visual {
  position: relative;
}

.about-video-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-strong);
  aspect-ratio: 16 / 10;
}

.about-video-wrapper iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.about-accent-box {
  position: absolute;
  bottom: -30px;
  right: -30px;
  width: 180px;
  height: 180px;
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  opacity: 0.15;
  z-index: -1;
}

.about-content .section-tag {
  text-align: left;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 24px 0 40px;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.value-item {
  display: flex;
  gap: 20px;
}

.value-number {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.4;
  line-height: 1;
  flex-shrink: 0;
  width: 40px;
}

.value-item h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
}

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

/* --- Materials Marquee --- */
.materials {
  padding-top: 0;
}

.materials-marquee {
  width: 100%;
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 32px 0;
}

.marquee-track {
  display: flex;
  gap: 40px;
  align-items: center;
  width: max-content;
  animation: marquee 30s linear infinite;
}

.marquee-track span {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: -0.02em;
  white-space: nowrap;
  transition: color 0.3s;
}

.marquee-track span:hover {
  color: var(--accent);
}

.marquee-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
  flex-shrink: 0;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* --- Portfolio --- */
.portfolio {
  background: var(--bg-primary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.portfolio-item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.4s ease;
}

.portfolio-item.large {
  grid-column: span 2;
}

.portfolio-item:hover {
  border-color: var(--accent);
  box-shadow: 0 0 40px rgba(0, 198, 255, 0.1);
}

.portfolio-video {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-card);
}

.portfolio-item.large .portfolio-video {
  aspect-ratio: 21 / 9;
}

.portfolio-video iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.portfolio-info {
  padding: 20px 24px;
  background: var(--bg-card);
}

.portfolio-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 4px;
}

.portfolio-info h3 {
  font-size: 1rem;
  font-weight: 700;
}

/* --- Process --- */
.process {
  background: var(--bg-secondary);
}

.process-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  position: relative;
}

.process-timeline::before {
  content: '';
  position: absolute;
  top: 48px;
  left: 40px;
  right: 40px;
  height: 1px;
  background: var(--border-strong);
  z-index: 0;
}

.process-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 28px 32px;
  text-align: center;
  position: relative;
  z-index: 1;
  transition: all 0.4s ease;
}

.process-step:hover {
  border-color: var(--accent);
  transform: translateY(-6px);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 900;
  color: var(--accent);
  opacity: 0.15;
  position: absolute;
  top: 16px;
  right: 20px;
  line-height: 1;
}

.step-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  color: var(--accent);
  position: relative;
}

.step-icon::before {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  background: var(--accent-dim);
  z-index: -1;
}

.process-step h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.process-step p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --- Contact --- */
.contact {
  background: var(--bg-primary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-info .section-tag {
  text-align: left;
}

.contact-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 20px 0 40px;
  line-height: 1.7;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.contact-method:hover {
  border-color: var(--accent);
  background: var(--bg-elevated);
}

.method-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-dim);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.method-icon svg {
  width: 20px;
  height: 20px;
}

.contact-method strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.contact-method span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Contact Form --- */
.contact-form-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.form-group.full {
  grid-column: span 2;
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.9rem;
  transition: all 0.3s ease;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

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

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer-logo {
  width: 120px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-nav h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.footer-nav a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 4px 0;
  transition: color 0.3s;
}

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

.footer-cta h4 {
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

/* --- Animation Classes --- */
[data-animate] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Nav Open State --- */
.nav.open .nav-links {
  display: flex;
}

.nav.open .nav-toggle span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav.open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.nav.open .nav-toggle span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  
  .portfolio-item.large {
    grid-column: span 1;
  }
  
  .portfolio-item.large .portfolio-video {
    aspect-ratio: 16 / 9;
  }
  
  .process-timeline {
    grid-template-columns: 1fr 1fr;
  }
  
  .process-timeline::before {
    display: none;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    flex-direction: column;
    justify-content: center;
    gap: 40px;
    z-index: 999;
  }
  
  .nav-toggle {
    display: flex;
    z-index: 1000;
  }
  
  .nav-link {
    font-size: 1.5rem;
  }
  
  .nav-cta {
    font-size: 1rem;
    padding: 14px 40px;
  }
}

@media (max-width: 640px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  section {
    padding: 80px 0;
  }
  
  .container {
    padding: 0 20px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .process-timeline {
    grid-template-columns: 1fr;
  }
  
  .contact-form {
    grid-template-columns: 1fr;
  }
  
  .form-group.full {
    grid-column: span 1;
  }
  
  .contact-form-wrapper {
    padding: 28px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .service-card {
    padding: 36px 24px;
  }
  
  .about-accent-box {
    display: none;
  }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  .marquee-track {
    animation: none;
  }
  
  [data-animate] {
    transition: none;
  }
}