/* ============================================
   MSTech Toy - Smart RC Toys Wholesale
   Design: Clean, Modern, B2B Professional
   ============================================ */

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

:root {
  --primary: #1a56db;
  --primary-dark: #1e40af;
  --accent: #f59e0b;
  --text: #1f2937;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-gray: #f9fafb;
  --bg-dark: #111827;
  --border: #e5e7eb;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --max-width: 1200px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }

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

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

/* --- Header --- */
.header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.logo span { color: var(--text); font-weight: 400; }

.nav { display: flex; gap: 32px; list-style: none; }
.nav a {
  color: var(--text-light);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.nav a:hover, .nav a.active { color: var(--primary); border-bottom-color: var(--primary); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); margin: 5px 0; transition: 0.3s; }

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #1e3a5f 100%);
  color: #fff;
  padding: 100px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

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

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.25s;
  border: 2px solid transparent;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: #1f2937;
}
.btn-primary:hover { background: #fbbf24; transform: translateY(-1px); box-shadow: var(--shadow-lg); color: #1f2937; }

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; color: #fff; }

.btn-sm { padding: 8px 20px; font-size: 0.875rem; }

/* --- Sections --- */
.section { padding: 80px 0; }
.section-gray { background: var(--bg-gray); }

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 56px;
  font-size: 1.05rem;
}

/* --- Features Grid --- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: all 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: #eff6ff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p { color: var(--text-light); font-size: 0.95rem; line-height: 1.7; }

/* --- Product Cards --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
}

.product-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s;
}

.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }

.product-img {
  width: 100%;
  height: 260px;
  background: var(--bg-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.product-img img { width: 100%; height: 100%; object-fit: cover; }

.product-info { padding: 24px; }

.product-info h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }

.product-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.tag-green { background: #d1fae5; color: #065f46; }
.tag-blue { background: #dbeafe; color: #1e40af; }
.tag-yellow { background: #fef3c7; color: #92400e; }

.product-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
}

.product-price small { font-weight: 400; font-size: 0.8rem; color: var(--text-light); }

.product-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* --- Product Detail --- */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

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

.product-gallery .main-img {
  width: 100%;
  height: 400px;
  background: var(--bg-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
}

.product-specs { padding: 28px 0; }

.product-specs h1 { font-size: 2rem; font-weight: 700; margin-bottom: 16px; }

.specs-table { width: 100%; border-collapse: collapse; margin: 24px 0; }

.specs-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.specs-table td:first-child {
  font-weight: 600;
  color: var(--text-light);
  width: 35%;
}

/* --- Contact Form --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 16px; }

.contact-info p { color: var(--text-light); margin-bottom: 32px; line-height: 1.8; }

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  background: #eff6ff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.contact-item span { color: var(--text-light); font-size: 0.9rem; }

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

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
  background: var(--bg);
}

.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(26,86,219,0.1);
}

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

/* --- About --- */
.about-intro { max-width: 800px; margin: 0 auto 60px; text-align: center; }

.about-intro p { font-size: 1.1rem; color: var(--text-light); line-height: 1.9; }

.about-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.highlight-card {
  text-align: center;
  padding: 32px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s;
}

.highlight-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }

.highlight-number { font-size: 2.5rem; font-weight: 800; color: var(--primary); }
.highlight-label { color: var(--text-light); margin-top: 8px; font-size: 0.95rem; }

/* --- CTA --- */
.cta-section {
  background: var(--bg-dark);
  color: #fff;
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 { font-size: 2rem; font-weight: 700; margin-bottom: 16px; }
.cta-section p { opacity: 0.8; max-width: 560px; margin: 0 auto 32px; font-size: 1.05rem; }

/* --- Footer --- */
.footer {
  background: var(--bg-dark);
  color: #9ca3af;
  padding: 48px 0 32px;
  border-top: 1px solid #1f2937;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
.footer p { font-size: 0.9rem; line-height: 1.8; }
.footer a { color: #9ca3af; font-size: 0.9rem; }
.footer a:hover { color: #fff; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }

.footer-bottom {
  border-top: 1px solid #1f2937;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .hero { padding: 60px 0 50px; }

  .features { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .about-highlights { grid-template-columns: 1fr; }
  .product-detail { grid-template-columns: 1fr; gap: 32px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }

  .nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    gap: 12px;
  }
  .nav.active { display: flex; }
  .nav-toggle { display: block; }

  .section { padding: 56px 0; }
  .section-title { font-size: 1.6rem; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .hero-buttons { flex-direction: column; }
  .btn { width: 100%; }
}