/* Root variables */
:root {
  --color-dark-gray: #222;
  --color-black: #000;
  --color-white: #fff;
  --color-cool-gray: #f9f9f9;
  --color-blue: #1A365D;
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --heading-stack: "Roboto Condensed", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --max-content-width: 960px;
  --gutter: 1.5rem;
}

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

html {
  font-size: 16px;
  line-height: 1.5;
}

body {
  font-family: var(--font-stack);
  background: var(--color-cool-gray);
  color: #333;
}

/* Layout containers */
main {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: var(--gutter);
}

.container {
  width: 100%;
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Header & Navigation */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-dark-gray);
  color: var(--color-white);
  padding: 1rem var(--gutter);
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 2px solid #111;
}

.logo {
  font-family: var(--heading-stack);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: 0.5px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--color-white);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.4px;
}

.nav-links a.active,
.nav-links a:hover,
.nav-links a:focus {
  border-bottom: 2px solid var(--color-blue);
}

/* Quote badge */
.quote-count {
  background: var(--color-blue);
  color: var(--color-white);
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  font-weight: bold;
}

.quote-count.is-updated {
  animation: quotePulse 0.45s ease-out;
}

@keyframes quotePulse {
  0% {
    transform: scale(1);
  }
  30% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

/* Hero */
.hero {
  background: var(--color-dark-gray);
  color: var(--color-white);
  padding: 3rem var(--gutter);
  text-align: left;
  border-bottom: 2px solid #111;
}

.hero h1 {
  font-family: var(--heading-stack);
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  letter-spacing: 0.4px;
}

.hero p {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.cta-buttons {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Buttons – mechanical style */
.btn,
.btn-secondary {
  color: var(--color-white);
  padding: 0.6rem 1.2rem;
  border: 2px solid var(--color-blue);
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.btn {
  background: var(--color-blue);
}

.btn-secondary {
  background: var(--color-dark-gray);
  border-color: var(--color-dark-gray);
}

.btn:hover,
.btn:focus {
  background: #163e7a;
  border-color: #0f2e5a;
}

.btn-secondary:hover,
.btn-secondary:focus {
  background: #111;
  border-color: #0a0a0a;
}

/* Section titles */
.section-title {
  font-family: var(--heading-stack);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: 0.3px;
}

/* Section spacing and intro */
section {
  margin: 2rem 0;
}

.section-intro {
  max-width: 720px;
  margin: 0 auto 1.5rem;
  text-align: center;
}

/* Grids */
.model-grid {
  display: flex;
  gap: var(--gutter);
  flex-wrap: wrap;
  justify-content: center;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gutter);
}

/* Cards – mechanical */
.card,
.product-card,
.contact-card {
  background: var(--color-white);
  padding: 1.2rem;
  border: 2px solid #e0e0e0;
  border-radius: 2px;
  box-shadow: none;
  text-align: center;
}

.card {
  width: 260px;
}

.product-card {
  width: auto;
  height: 100%;
}

.contact-card {
  flex: 1 1 300px;
}

.card img,
.contact-card img {
  width: 80px;
  height: auto;
  margin: 0 auto 1rem auto;
}

.product-card img {
  width: 100%;
  max-height: 200px;
  object-fit: contain;
  margin: 0 auto 1rem auto;
}

/* Tag */
.tag {
  display: inline-block;
  background: var(--color-blue);
  color: var(--color-white);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.85rem;
}

/* Supply list */
.supply-list {
  list-style: disc inside;
}

/* Steps */
.steps {
  margin-left: 1.5rem;
}

/* Guide */
.guide {
  max-width: 720px;
  margin: 0 auto;
}

/* Catalog toolbar */
.catalog-toolbar {
  margin-bottom: 1rem;
  display: flex;
  gap: var(--gutter);
  flex-wrap: wrap;
}

/* Filter group */
.filter-group {
  font-weight: normal;
}

/* Quote summary – mechanical */
.quote-summary {
  background: var(--color-white);
  border: 2px solid #e0e0e0;
  border-radius: 2px;
  padding: 1rem;
  margin: 1rem 0;
}

.quote-summary ul {
  list-style: none;
  padding-left: 0;
}

.quote-summary li {
  margin-bottom: 0.3rem;
}

/* Notice – mechanical */
.notice {
  background: #e5f3ff;
  color: #00529b;
  border: 2px solid #b3d7ff;
  border-radius: 2px;
  padding: 0.8rem;
  margin-bottom: 1rem;
}

/* Badge */
.badge {
  background: var(--color-blue);
  color: var(--color-white);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.85rem;
}

/* Contact grid */
.contact-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gutter);
}

/* Inquiry form – mechanical */
.inquiry-form {
  max-width: 720px;
  margin: 0 auto;
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gutter);
}

.form-group {
  flex: 1 1 200px;
  display: flex;
  flex-direction: column;
}

.inquiry-form input,
.inquiry-form textarea,
.inquiry-form select {
  width: 100%;
  padding: 0.5rem 0.6rem;
  border: 2px solid #ccc;
  border-radius: 2px;
  font-size: 0.95rem;
  transition: border-color 0.2s, background 0.2s;
}

.inquiry-form input:focus,
.inquiry-form textarea:focus,
.inquiry-form select:focus {
  border-color: var(--color-blue);
  background: var(--color-white);
  outline: none;
}

.upload-note {
  font-size: 0.9rem;
  color: #555;
}

/* Footer */
.site-footer {
  background: var(--color-dark-gray);
  color: var(--color-white);
  padding: 1rem var(--gutter);
  text-align: center;
}

.footer-links a {
  color: var(--color-blue);
  margin: 0 0.3rem;
}

/* Empty state */
.empty-state {
  text-align: center;
  color: #777;
}

/* Error page */
.error-page {
  text-align: center;
  padding: 2rem;
}

/* Utility */
.hide {
  display: none;
}

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

/* Links */
a {
  color: var(--color-blue);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

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

/* Focus outline for accessibility */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
}

/* Table Styles - industrial data table */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

th,
td {
  border: 2px solid #e0e0e0;
  padding: 0.6rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--color-dark-gray);
  color: var(--color-white);
  font-family: var(--heading-stack);
  font-weight: 500;
  letter-spacing: 0.5px;
}

tr:nth-child(even) {
  background: var(--color-cool-gray);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    flex-direction: column;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .quote-count {
    position: fixed;
    right: 16px;
    bottom: 16px;
    z-index: 1000;
    min-width: 48px;
    min-height: 48px;
    padding: 0 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    font-size: 1rem;
    line-height: 1;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.28);
  }

  .model-grid {
    justify-content: flex-start;
  }

  .card,
  .contact-card {
    width: 100%;
  }

  main,
  .site-footer {
    padding: var(--gutter);
  }
}