/* ============================================================
   JIACYUAN ENERGY — Modern Redesign
   ============================================================ */

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

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --red:       #c0392b;
  --red-light: #e74c3c;
  --blue:      #1e90ff;
  --dark:      #0d0f12;
  --dark-2:    #141619;
  --dark-3:    #1c2027;
  --dark-4:    #252a33;
  --glass:     rgba(255,255,255,0.04);
  --glass-b:   rgba(255,255,255,0.08);
  --text:      #c8cdd6;
  --text-dim:  #7a8494;
  --white:     #ffffff;
  --border:    rgba(255,255,255,0.08);
  --nav-h:     70px;
  --radius:    8px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--dark);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--white); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

h1,h2,h3,h4,h5 {
  font-family: 'Barlow Condensed', sans-serif;
  color: var(--white);
  line-height: 1.2;
}

/* ── Utility ────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-dim);
  max-width: 560px;
  margin-bottom: 48px;
  font-size: 15px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--red);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--red-light);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(192,57,43,0.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--white);
  background: var(--glass);
  color: var(--white);
  transform: translateY(-2px);
}

/* ── Scroll Reveal ──────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  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; }

/* ── NAVBAR ─────────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-h);
  z-index: 9999;
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
}

#navbar.scrolled {
  background: rgba(13,15,18,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo img {
  height: 42px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text);
  transition: all var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: var(--glass-b);
}
.nav-links a.active {
  color: var(--red-light);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-select {
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: var(--radius);
  font-size: 12px;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  outline: none;
}
.lang-select option { background: var(--dark-2); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  width: 100%;
  background: rgba(13,15,18,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 9998;
  padding: 16px 0;
}
.mobile-nav.open { display: block; }
.mobile-nav a {
  display: block;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: var(--white); background: var(--glass); }

/* ── HERO ───────────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url('../images/bg-homepage.jpg') center/cover no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(13,15,18,0.92) 0%,
    rgba(13,15,18,0.75) 50%,
    rgba(192,57,43,0.15) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(192,57,43,0.15);
  border: 1px solid rgba(192,57,43,0.4);
  color: var(--red-light);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 28px;
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red-light);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 24px;
  text-transform: uppercase;
}

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

.hero-subtitle {
  font-size: 16px;
  color: var(--text);
  margin-bottom: 40px;
  line-height: 1.8;
  max-width: 500px;
}

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

.hero-stats {
  position: absolute;
  bottom: 60px;
  right: 0;
  z-index: 2;
  display: flex;
  gap: 2px;
}

.stat-card {
  background: var(--glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  padding: 20px 28px;
  text-align: center;
  min-width: 120px;
}

.stat-number {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}

.stat-number span { color: var(--red-light); }

.stat-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

/* ── ABOUT ──────────────────────────────────────────────────── */
#about {
  padding: 100px 0;
  background: var(--dark-2);
}

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

.about-text p {
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.8;
}

.highlight-text {
  color: var(--blue);
  font-weight: 600;
}

.highlight-green {
  color: #2ecc71;
  font-weight: 600;
}

/* Product Share bars */
.product-bars { margin-top: 8px; }

.bar-item { margin-bottom: 20px; }

.bar-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.bar-track {
  height: 4px;
  background: var(--dark-4);
  border-radius: 2px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--red), var(--red-light));
  border-radius: 2px;
  transform-origin: left;
  animation: barGrow 1.2s ease forwards;
  transform: scaleX(0);
}

@keyframes barGrow {
  to { transform: scaleX(1); }
}

/* Raw Material Cards */
.raw-section { margin-top: 80px; }

.raw-title-row {
  margin-bottom: 40px;
}

.raw-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.raw-card {
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.raw-card:hover {
  border-color: rgba(192,57,43,0.5);
  transform: translateY(-4px);
}

.raw-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  filter: brightness(0.85) saturate(0.8);
  transition: filter var(--transition);
}
.raw-card:hover img { filter: brightness(1) saturate(1); }

.raw-card-body {
  padding: 20px;
}

.raw-card-body h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.raw-card-body .origin {
  font-size: 12px;
  color: var(--red-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
  font-weight: 600;
}

.raw-card-body p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ── PRODUCTS ───────────────────────────────────────────────── */
#products {
  padding: 100px 0;
  background: var(--dark);
}

.products-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 48px;
  flex-wrap: wrap;
  gap: 24px;
}

.catalog-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--red-light);
  font-size: 14px;
  font-weight: 600;
  transition: gap var(--transition);
}
.catalog-link:hover { gap: 12px; color: var(--red-light); }
.catalog-link::after { content: '→'; }

/* Filter Tabs */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  transition: all var(--transition);
}
.filter-btn:hover { color: var(--white); border-color: var(--white); }
.filter-btn.active {
  background: var(--red);
  border-color: var(--red);
  color: var(--white);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.product-card:hover {
  border-color: rgba(192,57,43,0.5);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.product-card.hidden { display: none; }

.product-thumb {
  position: relative;
  overflow: hidden;
  background: var(--dark-4);
  aspect-ratio: 4/3;
}

.product-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 16px;
  transition: transform var(--transition);
}
.product-card:hover .product-thumb img { transform: scale(1.05); }

.product-thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(192,57,43,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.product-card:hover .product-thumb-overlay { opacity: 1; }

.product-thumb-overlay a {
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 2px solid rgba(255,255,255,0.6);
  padding: 10px 24px;
  border-radius: var(--radius);
  transition: border-color var(--transition);
}
.product-thumb-overlay a:hover { border-color: var(--white); color: var(--white); }

.product-info {
  padding: 20px;
  border-top: 1px solid var(--border);
}

.product-category-tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--red-light);
  margin-bottom: 8px;
}

.product-info h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.product-info p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ── QUALITY ────────────────────────────────────────────────── */
#quality {
  padding: 100px 0;
  background: var(--dark-2);
}

.quality-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-bottom: 64px;
  align-items: start;
}

.quality-intro p { color: var(--text); line-height: 1.8; margin-bottom: 16px; }

.quality-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.quality-card {
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
}

.quality-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--red), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.quality-card:hover {
  border-color: rgba(192,57,43,0.4);
  transform: translateY(-4px);
}
.quality-card:hover::before { opacity: 1; }

.quality-icon {
  width: 48px;
  height: 48px;
  background: rgba(192,57,43,0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: background var(--transition);
}
.quality-card:hover .quality-icon { background: rgba(192,57,43,0.2); }
.quality-icon i { font-size: 20px; color: var(--red-light); }

.quality-card h4 {
  font-size: 1rem;
  margin-bottom: 12px;
  font-weight: 700;
}

.quality-card p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ── CONTACT ────────────────────────────────────────────────── */
#contact {
  padding: 100px 0;
  background: var(--dark);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.4rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.contact-info .subtitle {
  color: var(--text-dim);
  margin-bottom: 40px;
  font-size: 14px;
}

.contact-person {
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 32px;
}

.contact-person p {
  font-size: 14px;
  margin-bottom: 4px;
}

.contact-person .person-name {
  font-weight: 600;
  color: var(--white);
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.contact-item-icon {
  width: 36px;
  height: 36px;
  background: rgba(192,57,43,0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.contact-item-icon i { color: var(--red-light); font-size: 14px; }

.contact-item-content {
  font-size: 14px;
  line-height: 1.6;
}

.contact-item-content strong {
  display: block;
  color: var(--text-dim);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 2px;
  font-weight: 600;
}

.contact-item-content a {
  color: var(--text);
  transition: color var(--transition);
}
.contact-item-content a:hover { color: var(--red-light); }

.map-wrapper {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.map-wrapper iframe {
  width: 100%;
  height: 420px;
  display: block;
  filter: grayscale(30%) brightness(0.85);
}

/* ── FOOTER ─────────────────────────────────────────────────── */
footer {
  background: var(--dark-2);
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-dim);
}

.footer-socials {
  display: flex;
  gap: 12px;
}

.footer-socials a {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 14px;
  transition: all var(--transition);
}
.footer-socials a:hover {
  border-color: var(--red);
  color: var(--red-light);
  background: rgba(192,57,43,0.1);
}

/* ── Section Divider ────────────────────────────────────────── */
.section-red-line {
  display: block;
  width: 48px;
  height: 3px;
  background: var(--red);
  margin-bottom: 24px;
  border-radius: 2px;
}

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 991px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }

  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .raw-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .quality-intro { grid-template-columns: 1fr; gap: 32px; }
  .quality-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-stats { display: none; }
}

@media (max-width: 600px) {
  .raw-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .quality-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2.6rem; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .nav-logo img { height: 34px; }
}