/* ============================================================
   CYS Bearing v3 — Global CSS
   Industrial B&W + Tech Blue
   ============================================================ */

:root {
  --color-primary: #1976D2;
  --color-primary-dark: #1565C0;
  --color-primary-light: #E3F2FD;
  --color-price: #2E7D32;
  --color-promotion: #FF9800;
  --color-error: #D32F2F;
  --color-success: #2E7D32;
  --color-warning: #F57C00;

  --color-bg: #F5F5F7;
  --color-card: #FFFFFF;
  --color-border: #E0E0E0;
  --color-border-light: #EEEEEE;

  --color-text-primary: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-auxiliary: #999999;

  --container-max: 1280px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, Consolas, "Courier New", monospace;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button {
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  outline: none;
  transition: border-color var(--transition-fast);
}
input:focus, select:focus, textarea:focus {
  border-color: var(--color-primary);
}

.mono { font-family: var(--font-mono); }

/* Layout */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section { padding: var(--space-7) 0; }
.section-sm { padding: var(--space-5) 0; }

.grid {
  display: grid;
  gap: var(--space-4);
}

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { display: flex; flex-direction: column; }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }

/* Typography */
h1 { font-size: 2rem; font-weight: 700; line-height: 1.2; }
h2 { font-size: 1.5rem; font-weight: 700; line-height: 1.3; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.4; }
h4 { font-size: 1rem; font-weight: 600; line-height: 1.5; }

.text-secondary { color: var(--color-text-secondary); }
.text-auxiliary { color: var(--color-text-auxiliary); }
.text-primary-color { color: var(--color-primary); }
.text-price { color: var(--color-price); font-weight: 600; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }

.text-center { text-align: center; }
.text-right { text-align: right; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: white;
}

.btn-secondary {
  background: white;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary-light);
}

.btn-success {
  background: var(--color-price);
  color: white;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-lg { padding: 14px 28px; font-size: 1.125rem; }
.btn-sm { padding: 6px 12px; font-size: 0.875rem; }
.btn-block { display: flex; width: 100%; }

/* Cards */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.card-hover {
  transition: all var(--transition-fast);
}
.card-hover:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary);
}
.badge-success { background: #E8F5E9; color: var(--color-success); }
.badge-warning { background: #FFF3E0; color: var(--color-warning); }

/* Top Navigation */
.topbar {
  background: white;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  max-width: var(--container-max);
  margin: 0 auto;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-primary);
  text-decoration: none;
}
.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
}

.nav-main {
  display: flex;
  gap: var(--space-4);
}
.nav-main a {
  color: var(--color-text-primary);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
}
.nav-main a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.search-box {
  flex: 1;
  max-width: 480px;
  position: relative;
}
.search-box input {
  width: 100%;
  padding: 8px 12px 8px 36px;
  border-radius: var(--radius-md);
}
.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-auxiliary);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.lang-dropdown {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: white;
  cursor: pointer;
}

/* FAB Contact */
.fab-contact {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.fab-contact .btn {
  box-shadow: var(--shadow-lg);
  min-width: 160px;
}

/* Footer */
.footer {
  background: white;
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0 var(--space-4);
  margin-top: var(--space-8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-5);
}
.footer-col h4 { margin-bottom: var(--space-3); }
.footer-col a {
  display: block;
  color: var(--color-text-secondary);
  padding: var(--space-1) 0;
}
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom {
  text-align: center;
  padding-top: var(--space-4);
  margin-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-auxiliary);
  font-size: 0.875rem;
}

/* Mobile Nav */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  font-size: 1.5rem;
}

/* Tables */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.spec-table th, .spec-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
  text-align: left;
}
.spec-table th {
  background: var(--color-bg);
  font-weight: 600;
  color: var(--color-text-secondary);
}
.spec-table tr:last-child td { border-bottom: none; }

/* Utility */
.hidden { display: none !important; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }

/* Responsive */
@media (max-width: 768px) {
  .topbar-inner { flex-wrap: wrap; }
  .nav-main { display: none; }
  .mobile-menu-btn { display: block; }
  .search-box { order: 3; flex: 1 0 100%; max-width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-4); }
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  .container { padding: 0 var(--space-3); }
}