/* ===== Base Reset & Variables ===== */
:root {
  --primary: #1a56db;
  --primary-dark: #1e429f;
  --primary-light: #e1effe;
  --secondary: #f59e0b;
  --dark: #111827;
  --gray-900: #1f2937;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --white: #ffffff;
  --success: #10b981;
  --danger: #ef4444;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px 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);
  --radius: 8px;
  --radius-lg: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--gray-900); line-height: 1.6; background: var(--white); }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Header ===== */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-100);
  position: sticky; top: 0; z-index: 1000;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo {
  font-size: 1.25rem; font-weight: 800; color: var(--primary);
  letter-spacing: -0.02em; display: flex; align-items: center; gap: 10px;
}
.logo-icon {
  width: 36px; height: 36px; background: var(--primary); color: var(--white);
  border-radius: var(--radius); display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 700;
}
.main-nav { display: flex; align-items: center; gap: 32px; }
.main-nav a {
  font-size: 0.95rem; font-weight: 500; color: var(--gray-700);
  position: relative; padding: 4px 0; transition: color 0.2s;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); }
.main-nav a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--primary); transition: width 0.3s;
}
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 16px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: var(--radius); font-size: 0.9rem;
  font-weight: 600; border: none; cursor: pointer; transition: all 0.2s;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: transparent; border: 1.5px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

.facebook-link {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.85rem; transition: all 0.2s;
}
.facebook-link:hover { background: var(--primary); color: var(--white); }

.mobile-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--gray-700); }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #1a56db 0%, #1e429f 50%, #111827 100%);
  color: var(--white); padding: 100px 0 80px; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
}
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-content h1 { font-size: 3rem; font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.hero-content p { font-size: 1.15rem; opacity: 0.9; margin-bottom: 32px; max-width: 480px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
}
.hero-visual img {
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  aspect-ratio: 4/3; object-fit: cover; background: var(--white);
}
.hero-visual img:first-child { transform: translateY(20px); }

/* ===== Section Common ===== */
.section { padding: 80px 0; }
.section-title {
  font-size: 2.2rem; font-weight: 800; text-align: center; margin-bottom: 12px; color: var(--dark);
}
.section-subtitle {
  text-align: center; color: var(--gray-500); font-size: 1.05rem; max-width: 600px; margin: 0 auto 48px;
}

/* ===== Stats Bar ===== */
.stats-bar {
  background: var(--gray-100); padding: 40px 0;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center;
}
.stat-item h3 { font-size: 2.2rem; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.stat-item p { color: var(--gray-500); font-size: 0.95rem; }

/* ===== Categories ===== */
.category-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px;
}
.category-card {
  background: var(--white); border: 1px solid var(--gray-100); border-radius: var(--radius-lg);
  padding: 32px 24px; text-align: center; transition: all 0.3s; cursor: pointer;
}
.category-card:hover {
  border-color: var(--primary-light); box-shadow: var(--shadow-lg); transform: translateY(-4px);
}
.category-card .icon {
  width: 56px; height: 56px; background: var(--primary-light); color: var(--primary);
  border-radius: var(--radius); display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px; font-size: 1.5rem;
}
.category-card h4 { font-size: 1.1rem; margin-bottom: 6px; }
.category-card span { color: var(--gray-500); font-size: 0.85rem; }

/* ===== Products ===== */
.product-filter {
  display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-bottom: 40px;
}
.filter-btn {
  padding: 8px 20px; border-radius: 100px; border: 1px solid var(--gray-300);
  background: var(--white); color: var(--gray-700); font-size: 0.9rem; cursor: pointer;
  transition: all 0.2s; font-weight: 500;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--primary); color: var(--white); border-color: var(--primary);
}

.product-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px;
}
.product-card {
  background: var(--white); border: 1px solid var(--gray-100); border-radius: var(--radius-lg);
  overflow: hidden; transition: all 0.3s;
}
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.product-image {
  aspect-ratio: 4/3; background: var(--gray-100); display: flex; align-items: center; justify-content: center;
  overflow: hidden; position: relative;
}
.product-image img { width: 100%; height: 100%; object-fit: cover; }
.product-badge {
  position: absolute; top: 12px; left: 12px;
  background: var(--secondary); color: var(--white); font-size: 0.75rem;
  font-weight: 700; padding: 4px 10px; border-radius: 100px;
}
.product-info { padding: 20px; }
.product-model { font-size: 0.8rem; color: var(--primary); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.product-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.product-desc { font-size: 0.88rem; color: var(--gray-500); margin-bottom: 16px; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.product-footer { display: flex; justify-content: space-between; align-items: center; }
.product-link { font-size: 0.85rem; font-weight: 600; color: var(--primary); display: flex; align-items: center; gap: 4px; }
.product-link:hover { text-decoration: underline; }

/* ===== Product Detail Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 2000;
  display: flex; align-items: center; justify-content: center; padding: 20px;
  opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal {
  background: var(--white); border-radius: var(--radius-lg); max-width: 900px; width: 100%;
  max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg);
  transform: scale(0.95); transition: transform 0.3s;
}
.modal-overlay.active .modal { transform: scale(1); }
.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 28px; border-bottom: 1px solid var(--gray-100);
}
.modal-header h2 { font-size: 1.3rem; }
.modal-close {
  background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--gray-500);
  width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
}
.modal-close:hover { background: var(--gray-100); }
.modal-body { padding: 28px; }
.modal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.modal-image { border-radius: var(--radius); overflow: hidden; background: var(--gray-100); }
.modal-image img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.modal-specs h3 { font-size: 1.1rem; margin-bottom: 16px; }
.spec-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--gray-100); font-size: 0.9rem; }
.spec-row span:first-child { color: var(--gray-500); }
.spec-row span:last-child { font-weight: 600; color: var(--dark); }

/* ===== About Page ===== */
.about-hero { background: linear-gradient(135deg, #f3f4f6 0%, #e1effe 100%); padding: 80px 0 60px; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-content h1 { font-size: 2.5rem; margin-bottom: 20px; }
.about-content p { color: var(--gray-700); font-size: 1.05rem; margin-bottom: 16px; }
.about-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.about-image img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }

.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.value-card {
  background: var(--white); border: 1px solid var(--gray-100); border-radius: var(--radius-lg);
  padding: 28px; text-align: center;
}
.value-card .icon { font-size: 2rem; margin-bottom: 12px; }
.value-card h4 { font-size: 1.1rem; margin-bottom: 8px; }
.value-card p { font-size: 0.9rem; color: var(--gray-500); }

/* ===== Exhibitions ===== */
.exhibition-list { display: flex; flex-direction: column; gap: 20px; }
.exhibition-card {
  background: var(--white); border: 1px solid var(--gray-100); border-radius: var(--radius-lg);
  padding: 28px; display: grid; grid-template-columns: auto 1fr auto; gap: 24px; align-items: center;
  transition: all 0.3s;
}
.exhibition-card:hover { box-shadow: var(--shadow); }
.exhibition-date {
  background: var(--primary-light); color: var(--primary); border-radius: var(--radius);
  padding: 16px 20px; text-align: center; min-width: 90px;
}
.exhibition-date .day { font-size: 1.6rem; font-weight: 800; line-height: 1; }
.exhibition-date .month { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; }
.exhibition-info h3 { font-size: 1.15rem; margin-bottom: 6px; }
.exhibition-info p { color: var(--gray-500); font-size: 0.9rem; }
.exhibition-badge {
  background: var(--success); color: var(--white); font-size: 0.75rem; font-weight: 700;
  padding: 6px 14px; border-radius: 100px; white-space: nowrap;
}

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h3 { font-size: 1.3rem; margin-bottom: 20px; }
.contact-item { display: flex; gap: 16px; margin-bottom: 20px; }
.contact-item .icon { width: 44px; height: 44px; background: var(--primary-light); color: var(--primary); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }
.contact-item h4 { font-size: 0.95rem; margin-bottom: 4px; }
.contact-item p { color: var(--gray-500); 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(--gray-700); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border: 1px solid var(--gray-300); border-radius: var(--radius);
  font-size: 0.95rem; font-family: var(--font); transition: border-color 0.2s; background: var(--white);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* ===== Inquiry ===== */
.inquiry-products { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 12px; }
.inquiry-products label { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--gray-200); border-radius: var(--radius); cursor: pointer; font-size: 0.85rem; transition: all 0.2s; }
.inquiry-products label:hover { border-color: var(--primary); }
.inquiry-products input:checked + span { color: var(--primary); font-weight: 600; }
.inquiry-products label:has(input:checked) { border-color: var(--primary); background: var(--primary-light); }

/* ===== Footer ===== */
.site-footer { background: var(--dark); color: var(--gray-300); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand h3 { color: var(--white); font-size: 1.2rem; margin-bottom: 12px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; margin-bottom: 16px; color: var(--gray-500); }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 36px; height: 36px; background: var(--gray-700); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 0.85rem;
  transition: all 0.2s; color: var(--white);
}
.footer-social a:hover { background: var(--primary); }
.footer-col h4 { color: var(--white); font-size: 0.95rem; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 0.9rem; color: var(--gray-500); margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: var(--white); }
.footer-bottom { border-top: 1px solid var(--gray-700); padding: 20px 0; text-align: center; font-size: 0.85rem; color: var(--gray-500); }

/* ===== Page Banner ===== */
.page-banner { background: linear-gradient(135deg, #1a56db 0%, #1e429f 100%); color: var(--white); padding: 60px 0; text-align: center; }
.page-banner h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 8px; }
.page-banner p { opacity: 0.9; font-size: 1.05rem; }

/* ===== Toast ===== */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 3000; display: flex; flex-direction: column; gap: 10px; }
.toast {
  background: var(--dark); color: var(--white); padding: 14px 20px; border-radius: var(--radius);
  font-size: 0.9rem; box-shadow: var(--shadow-lg); animation: toastIn 0.3s ease;
  display: flex; align-items: center; gap: 10px;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
@keyframes toastIn { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .hero-inner, .about-grid, .contact-grid, .modal-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-visual { order: -1; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; position: absolute; top: 72px; left: 0; right: 0; background: var(--white); flex-direction: column; padding: 20px; gap: 16px; border-bottom: 1px solid var(--gray-100); box-shadow: var(--shadow); }
  .main-nav.open { display: flex; }
  .mobile-toggle { display: block; }
  .hero-content h1 { font-size: 2rem; }
  .section-title { font-size: 1.8rem; }
  .values-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .exhibition-card { grid-template-columns: 1fr; text-align: center; }
  .exhibition-date { margin: 0 auto; }
  .form-row { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
}