/* ============================================
   LongLu Materials - Global Styles
   Premium Compact Yarn Manufacturer
   ============================================ */

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

:root {
  --primary: #1a365d;
  --primary-light: #2a4a7f;
  --primary-dark: #0f2440;
  --accent: #c8922a;
  --accent-light: #daa844;
  --accent-dark: #a87720;
  --white: #ffffff;
  --off-white: #f7f8fa;
  --gray-50: #f0f2f5;
  --gray-100: #e2e6ec;
  --gray-200: #c9ced8;
  --gray-300: #a0a8b8;
  --gray-400: #717d94;
  --gray-500: #4a5568;
  --gray-600: #3a4456;
  --gray-700: #2d3748;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-light: #718096;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --header-height: 72px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-primary);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

ul { list-style: none; }

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--primary);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  margin-bottom: 12px;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-title .accent-line {
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
}

.btn-outline:hover {
  background: var(--white);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-outline-primary {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline-primary:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  height: var(--header-height);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
}

.logo .logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.1rem;
  font-weight: 900;
}

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

.nav-list a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}

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

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

.nav-cta {
  padding: 8px 20px;
  background: var(--accent);
  color: var(--white) !important;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
}

.nav-cta::after { display: none !important; }

.nav-cta:hover {
  background: var(--accent-dark) !important;
  transform: translateY(-1px);
}

/* Mobile menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

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

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  color: var(--white);
  padding-top: var(--header-height);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(200,146,42,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
  border-radius: 50%;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 640px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(200,146,42,0.2);
  border: 1px solid rgba(200,146,42,0.4);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--accent-light);
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.hero h1 {
  color: var(--white);
  margin-bottom: 20px;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.2;
}

.hero h1 .highlight {
  color: var(--accent-light);
}

.hero p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  line-height: 1.8;
}

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

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.hero-stat h3 {
  color: var(--accent-light);
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.hero-stat p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 0;
}

/* --- Sections Common --- */
section {
  padding: 90px 0;
}

.section-alt {
  background: var(--off-white);
}

/* --- Product Categories --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid var(--gray-100);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.product-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.6rem;
}

.product-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.product-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.product-link {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.product-link:hover {
  color: var(--accent-dark);
  gap: 8px;
}

/* --- Why Choose Us --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  padding: 32px;
  background: var(--white);
  border-radius: var(--radius-md);
  transition: var(--transition);
  border-left: 3px solid transparent;
}

.feature-card:hover {
  border-left-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* --- About Preview --- */
.about-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
  border-radius: var(--radius-lg);
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 4rem;
  position: relative;
  overflow: hidden;
}

.about-image .placeholder-text {
  font-size: 1rem;
  color: var(--gray-400);
  text-align: center;
}

.about-text h2 {
  margin-bottom: 20px;
}

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

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0;
}

.about-highlight {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.about-highlight .check {
  color: var(--accent);
  font-weight: 700;
}

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: var(--white);
  text-align: center;
  padding: 70px 0;
}

.cta-section h2 {
  color: var(--white);
  margin-bottom: 16px;
}

.cta-section p {
  color: rgba(255,255,255,0.75);
  max-width: 500px;
  margin: 0 auto 28px;
  font-size: 1.05rem;
}

/* --- News Section --- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

.news-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--gray-100);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.news-card-image {
  height: 200px;
  background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-300);
  font-size: 2.5rem;
}

.news-card-body {
  padding: 24px;
}

.news-card-meta {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 10px;
  display: flex;
  gap: 16px;
}

.news-card h3 {
  font-size: 1.08rem;
  margin-bottom: 10px;
  line-height: 1.5;
}

.news-card h3 a:hover {
  color: var(--accent);
}

.news-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  background: var(--off-white);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-info-item h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.contact-info-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Form --- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-family: inherit;
  transition: var(--transition);
  background: var(--white);
  color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,54,93,0.1);
}

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

/* --- Footer --- */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand p {
  font-size: 0.9rem;
  margin: 16px 0 20px;
  line-height: 1.7;
}

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

.footer-social a {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--accent);
  color: var(--white);
}

.footer h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
}

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

.footer-contact-item {
  display: flex;
  gap: 10px;
  font-size: 0.88rem;
  margin-bottom: 14px;
  align-items: flex-start;
}

.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

/* --- WhatsApp Float --- */
.whatsapp-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  width: 56px;
  height: 56px;
  background: #25D366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  box-shadow: 0 4px 16px rgba(37,211,102,0.4);
  transition: var(--transition);
  animation: pulse-whatsapp 2s infinite;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(37,211,102,0.5);
}

@keyframes pulse-whatsapp {
  0%, 100% { box-shadow: 0 4px 16px rgba(37,211,102,0.4); }
  50% { box-shadow: 0 4px 24px rgba(37,211,102,0.6); }
}

/* --- Page Header (inner pages) --- */
.page-header {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: var(--white);
  padding: 120px 0 60px;
  text-align: center;
}

.page-header h1 {
  color: var(--white);
  margin-bottom: 12px;
}

.page-header p {
  color: rgba(255,255,255,0.7);
  font-size: 1.05rem;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 0.88rem;
  margin-bottom: 20px;
  color: rgba(255,255,255,0.5);
}

.breadcrumb a {
  color: rgba(255,255,255,0.6);
}

.breadcrumb a:hover {
  color: var(--accent-light);
}

/* --- Product Detail Table --- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.spec-table th,
.spec-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
  font-size: 0.92rem;
}

.spec-table th {
  background: var(--off-white);
  color: var(--primary);
  font-weight: 600;
}

.spec-table tr:hover td {
  background: var(--gray-50);
}

/* --- Blog / News List --- */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.news-list-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 28px;
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}

.news-list-item:hover {
  box-shadow: var(--shadow-md);
}

.news-list-thumb {
  height: 100%;
  min-height: 200px;
  background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-300);
  font-size: 2rem;
}

.news-list-body {
  padding: 24px 24px 24px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.news-list-body .meta {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.news-list-body h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.news-list-body h3 a:hover {
  color: var(--accent);
}

.news-list-body p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

/* --- Responsive --- */
@media (max-width: 992px) {
  .about-preview {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
  .news-list-item {
    grid-template-columns: 1fr;
  }
  .news-list-thumb {
    min-height: 180px;
  }
}

@media (max-width: 768px) {
  section { padding: 60px 0; }
  
  .nav-list {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    padding: 20px;
    gap: 0;
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    transition: var(--transition);
  }
  
  .nav-list.open {
    transform: translateY(0);
  }
  
  .nav-list a {
    padding: 14px 0;
    border-bottom: 1px solid var(--gray-100);
    width: 100%;
    text-align: center;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .hero-buttons .btn {
    text-align: center;
    justify-content: center;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .news-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }