/* ============================================
   Longwei Engineering — Corporate Dark Theme
   ============================================ */

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #0f1629;
  --bg-tertiary: #141b2d;
  --bg-card: rgba(20, 27, 45, 0.7);
  --bg-glass: rgba(20, 27, 45, 0.5);
  --border-glass: rgba(255, 255, 255, 0.06);
  --text-primary: #e8edf5;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #00d4ff;
  --accent-indigo: #0066ff;
  --accent-purple: #7c3aed;
  --accent-green: #00ff88;
  --accent-gold: #fbbf24;
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0066ff 100%);
  --gradient-hero: linear-gradient(135deg, #00d4ff 0%, #0066ff 50%, #7c3aed 100%);
  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container-width: 1200px;
  --section-padding: 120px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: #fff; }

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

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Glass Card */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
}

/* ============================================
   LW Logo
   ============================================ */
.logo-lw {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  font-family: 'Arial Black', 'Helvetica Neue', Arial, sans-serif;
  flex-shrink: 0;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  padding: 10px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}
.logo:hover { color: var(--text-primary); }

.logo-icon {
  width: 36px;
  height: 36px;
}

.logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 400;
  position: relative;
  padding: 4px 0;
}

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

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

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

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

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

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

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: url('/images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,10,30,0.75) 0%, rgba(0,20,50,0.65) 100%);
  z-index: 1;
}



.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 70%);
}

.particle-field {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--accent-blue);
  opacity: 0;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: 0.6; }
  90% { opacity: 0.6; }
  100% { opacity: 0; transform: translateY(-10vh) scale(1); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent-blue);
  letter-spacing: 0.1em;
  margin-bottom: 32px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

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

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 102, 255, 0.3);
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 102, 255, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.btn-outline:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.05rem;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-suffix {
  font-size: 1.2rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
}

/* Scroll Indicator */
.scroll-indicator {
  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: 0.75rem;
  animation: scrollBounce 2s ease-in-out infinite;
}

.mouse {
  width: 24px;
  height: 38px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  position: relative;
}

.wheel {
  width: 3px;
  height: 8px;
  background: var(--accent-blue);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: wheelScroll 2s ease-in-out infinite;
}

@keyframes wheelScroll {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.3; transform: translateX(-50%) translateY(10px); }
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================
   Sections Common
   ============================================ */
.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--accent-blue);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.section-line {
  width: 60px;
  height: 3px;
  background: var(--gradient-primary);
  margin: 0 auto 20px;
  border-radius: 2px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.section-subheader {
  text-align: center;
  margin: 64px 0 32px;
}

.section-subheader h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  margin-bottom: 0;
}

.about-card {
  padding: 40px;
}

.about-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-card p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.9;
}
.about-card p:last-child { margin-bottom: 0; }

.about-card strong {
  color: var(--text-primary);
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  transition: all var(--transition);
}

.info-card:hover {
  border-color: rgba(0, 212, 255, 0.15);
  transform: translateX(4px);
}

.info-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-blue);
}

.info-icon svg {
  width: 22px;
  height: 22px;
}

.info-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.info-value {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Vision Grid (4 columns) */
.vision-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* Values / Vision Cards */
.value-card {
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
}

.value-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.15);
}

.value-icon-wrap {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
}

.value-icon-wrap svg {
  width: 100%;
  height: 100%;
}

.value-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.value-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Services Section
   ============================================ */
.services {
  background: var(--bg-primary);
  overflow: hidden;
}

.services-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 40% at 0% 50%, rgba(0, 102, 255, 0.06), transparent),
    radial-gradient(ellipse 50% 40% at 100% 50%, rgba(124, 58, 237, 0.05), transparent);
  pointer-events: none;
}

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

.service-card {
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  padding: 36px 28px 32px;
  transition: all var(--transition-slow);
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 212, 255, 0.15);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon {
  width: 56px;
  height: 56px;
  margin-bottom: 20px;
  color: var(--accent-blue);
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-number {
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 3rem;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.03);
  line-height: 1;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.service-tags li {
  padding: 5px 14px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.12);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--accent-blue);
}

/* ============================================
   Qualifications Section
   ============================================ */
.qualifications {
  background: var(--bg-secondary);
}

/* Qualification Grades */
.qual-grade {
  margin-bottom: 48px;
}

.qual-grade:last-child {
  margin-bottom: 0;
}

.qual-grade-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.qual-grade-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 20px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.qual-grade-badge.grade-a {
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.2), rgba(245, 158, 11, 0.1));
  border: 1px solid rgba(251, 191, 36, 0.3);
  color: var(--accent-gold);
}

.qual-grade-badge.grade-b {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(0, 102, 255, 0.1));
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent-blue);
}

.qual-grade-badge.grade-s {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.15), rgba(167, 139, 250, 0.1));
  border: 1px solid rgba(124, 58, 237, 0.25);
  color: #a78bfa;
}

.qual-grade-header h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.qual-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.qual-detail-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.qual-detail-card {
  padding: 28px;
}

.qual-detail-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 12px;
}

.qual-detail-card ul {
  list-style: none;
  padding: 0;
}

.qual-detail-card ul li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.qual-detail-card ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient-primary);
}

.qual-detail-card ul li:last-child {
  margin-bottom: 0;
}

.qual-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Projects Section
   ============================================ */
.projects {
  background: var(--bg-primary);
  overflow: hidden;
}

.project-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.project-tab {
  padding: 10px 28px;
  border-radius: 50px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.project-tab:hover {
  border-color: rgba(0, 212, 255, 0.3);
  color: var(--text-primary);
}

.project-tab.active {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(0, 102, 255, 0.3);
}

.project-panel {
  display: none;
}

.project-panel.active {
  display: block;
}

.project-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.project-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  transition: all var(--transition);
}

.project-item:hover {
  border-color: rgba(0, 212, 255, 0.15);
  transform: translateY(-2px);
}

.project-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 10px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-blue);
  font-size: 0.82rem;
  font-weight: 700;
}

.project-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.4;
}

.project-info p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
  background: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
}

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

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 28px;
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: rgba(0, 212, 255, 0.15);
  transform: translateX(4px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-blue);
}

.contact-icon svg {
  width: 24px;
  height: 24px;
}

.contact-card h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.contact-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.contact-card p:last-child { margin-bottom: 0; }

.contact-card a {
  color: var(--text-secondary);
}
.contact-card a:hover {
  color: var(--accent-blue);
}

.cta-card {
  padding: 40px;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.cta-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.cta-card > p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.cta-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.cta-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.cta-feature svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

.cta-card .btn {
  margin-top: auto;
  align-self: flex-start;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-glass);
  padding: 64px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
}

.footer-links h5 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links a {
  display: block;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 4px 0;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

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

.footer-icp {
  font-size: 0.75rem;
}

/* ============================================
   Animations
   ============================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ============================================
   Inquiry / Contact Form Section
   ============================================ */
.inquiry {
  background: var(--bg-primary);
  overflow: hidden;
}

.inquiry-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 30% 50%, rgba(0, 212, 255, 0.06), transparent),
    radial-gradient(ellipse 50% 40% at 70% 60%, rgba(124, 58, 237, 0.05), transparent);
  pointer-events: none;
}

.inquiry-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 32px;
  align-items: start;
}

.inquiry-form {
  padding: 40px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group .required {
  color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.92rem;
  transition: all var(--transition);
  outline: none;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: rgba(0, 212, 255, 0.4);
  background: rgba(0, 212, 255, 0.04);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.08);
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
  cursor: pointer;
}

.form-group select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-submit {
  width: 100%;
  justify-content: center;
  margin-top: 4px;
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.form-status {
  margin-top: 16px;
  padding: 0;
  font-size: 0.9rem;
  text-align: center;
  border-radius: 10px;
  transition: all var(--transition);
}

.form-status.success {
  padding: 14px;
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid rgba(0, 255, 136, 0.2);
  color: var(--accent-green);
}

.form-status.error {
  padding: 14px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

.inquiry-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.inquiry-info-card {
  padding: 32px;
}

.inquiry-info-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.inquiry-features {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.inquiry-feature {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.feature-dot {
  width: 8px;
  height: 8px;
  min-width: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
  margin-top: 7px;
}

.inquiry-feature strong {
  display: block;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.inquiry-feature p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.inquiry-quick-contact {
  padding: 24px;
  text-align: center;
}

.inquiry-quick-contact p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 14px;
}

.inquiry-quick-contact .btn {
  width: 100%;
  justify-content: center;
}

/* ============================================
   Chat Widget
   ============================================ */
.chat-widget {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 9999;
}

.chat-fab {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--gradient-primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(0, 102, 255, 0.4);
  transition: all var(--transition);
  position: relative;
}

.chat-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 32px rgba(0, 102, 255, 0.5);
}

.chat-fab svg {
  width: 26px;
  height: 26px;
  color: #fff;
  transition: all var(--transition);
}

.chat-fab-icon {
  position: absolute;
}

.chat-fab-close {
  position: absolute;
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

.chat-widget.open .chat-fab-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

.chat-widget.open .chat-fab-close {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.chat-fab-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ef4444;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.chat-fab-badge.hidden {
  transform: scale(0);
  opacity: 0;
}

.chat-dialog {
  position: absolute;
  bottom: 76px;
  right: 0;
  width: 380px;
  max-height: 560px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transform: translateY(20px) scale(0.95);
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-widget.open .chat-dialog {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: rgba(0, 102, 255, 0.08);
  border-bottom: 1px solid var(--border-glass);
}

.chat-header-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chat-avatar {
  width: 36px;
  height: 36px;
}

.chat-avatar svg {
  width: 100%;
  height: 100%;
}

.chat-header-title {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.chat-header-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  color: var(--accent-green);
}

.chat-header-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.chat-close-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  border-radius: 8px;
  transition: all var(--transition);
}

.chat-close-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 280px;
  max-height: 360px;
}

.chat-messages::-webkit-scrollbar {
  width: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
}

.chat-message {
  display: flex;
  max-width: 85%;
}

.chat-message.bot {
  align-self: flex-start;
}

.chat-message.user {
  align-self: flex-end;
}

.chat-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 0.88rem;
  line-height: 1.6;
}

.chat-message.bot .chat-bubble {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.chat-message.user .chat-bubble {
  background: var(--gradient-primary);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.chat-message.typing .chat-bubble {
  display: flex;
  gap: 4px;
  padding: 14px 20px;
}

.typing-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: typingBounce 1.2s ease-in-out infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

.chat-input-area {
  padding: 12px 16px 16px;
  border-top: 1px solid var(--border-glass);
}

.chat-suggestions {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.chat-suggestion {
  padding: 5px 12px;
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: 16px;
  background: rgba(0, 212, 255, 0.05);
  color: var(--accent-blue);
  font-size: 0.76rem;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.chat-suggestion:hover {
  background: rgba(0, 212, 255, 0.12);
  border-color: rgba(0, 212, 255, 0.3);
}

.chat-input-form {
  display: flex;
  gap: 8px;
  align-items: center;
}

.chat-input {
  flex: 1;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.88rem;
  outline: none;
  transition: all var(--transition);
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.chat-input:focus {
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(0, 212, 255, 0.04);
}

.chat-send {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: 50%;
  background: var(--gradient-primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: all var(--transition);
}

.chat-send:hover {
  transform: scale(1.08);
}

.chat-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .vision-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .qual-detail-grid,
  .qual-detail-grid-3 {
    grid-template-columns: 1fr;
  }
  .project-list {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 80px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(30px);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 0;
    transition: right var(--transition);
    border-left: 1px solid var(--border-glass);
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    padding: 14px 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--border-glass);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-desc { font-size: 0.95rem; }

  .hero-stats {
    gap: 24px;
  }

  .stat-number { font-size: 2rem; }

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

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

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

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

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

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

  .inquiry-form {
    padding: 24px;
  }

  .project-tabs {
    gap: 8px;
  }

  .project-tab {
    padding: 8px 20px;
    font-size: 0.85rem;
  }

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

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

@media (max-width: 480px) {
  .hero-content { padding: 100px 16px 60px; }
  .hero h1 { font-size: 1.6rem; }
  .about-card { padding: 24px; }
  .service-card { padding: 28px 20px; }
  .cta-card { padding: 28px; }

  .chat-dialog {
    width: calc(100vw - 24px);
    right: -16px;
    bottom: 72px;
    max-height: 480px;
  }

  .chat-widget {
    bottom: 16px;
    right: 16px;
  }
}

/* ===== Service Card Images ===== */
.service-card { overflow: hidden; position: relative; }

.service-card .service-icon {
  position: relative;
  height: 180px;
  margin: -32px -32px 24px -32px;
  background-size: cover;
  background-position: center;
  border-radius: 16px 16px 0 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.service-card .service-icon::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,30,60,0.7) 0%, rgba(0,100,150,0.5) 100%);
}
.service-card .service-icon svg {
  position: relative;
  z-index: 1;
  width: 56px;
  height: 56px;
  color: rgba(255,255,255,0.9);
  filter: drop-shadow(0 0 12px rgba(0,212,255,0.6));
}
.service-card:nth-child(1) .service-icon { background-image: url('/images/service-chemical.jpg'); }
.service-card:nth-child(2) .service-icon { background-image: url('/images/service-municipal.jpg'); }
.service-card:nth-child(3) .service-icon { background-image: url('/images/service-oil.jpg'); }
.service-card:nth-child(4) .service-icon { background-image: url('/images/service-consulting.jpg'); }
.service-card:nth-child(5) .service-icon { background-image: url('/images/service-building.jpg'); }
.service-card:nth-child(6) .service-icon { background-image: url('/images/service-special.jpg'); }

/* ===== Vision Card Images ===== */
.vision-card {
  position: relative;
  overflow: hidden;
  background-size: cover;
  background-position: center;
}
.vision-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,20,40,0.55) 0%, rgba(0,10,30,0.85) 100%);
  z-index: 0;
}
.vision-card > * { position: relative; z-index: 1; }
.vision-card:nth-child(1) { background-image: url('/images/vision-tech.jpg'); }
.vision-card:nth-child(2) { background-image: url('/images/service-consulting.jpg'); }
.vision-card:nth-child(3) { background-image: url('/images/service-oil.jpg'); }
.vision-card:nth-child(4) { background-image: url('/images/service-special.jpg'); }