/* ========================================
   Wansheng Trading Co., Ltd. — Style Sheet
   ======================================== */

/* 1. CSS Variables */
:root {
  --color-primary: #2C3E2D;
  --color-primary-dark: #1e2b1f;
  --color-accent: #C4A77D;
  --color-accent-light: #d4bc96;
  --color-bg: #FAF8F5;
  --color-bg-alt: #f0ece6;
  --color-text: #2D2D2D;
  --color-text-light: #6b6b6b;
  --color-white: #ffffff;
  --color-border: #e0dbd3;

  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --container-max: 1200px;
  --section-padding: 80px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
  --transition: 0.3s ease;
}

/* 2. Reset / Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

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

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

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.125rem; }

p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

/* 3. Layout */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-padding) 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header p {
  max-width: 600px;
  margin: 12px auto 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* 4. Components */

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo img {
  height: 36px;
  width: auto;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-text span {
  color: var(--color-accent);
  font-size: 0.7rem;
  font-family: var(--font-body);
  font-weight: 500;
  letter-spacing: 2px;
  display: block;
  margin-top: -2px;
}

/* Navigation */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
  content: '';
  position: relative;
}

.nav-toggle-label span::before { top: -7px; }
.nav-toggle-label span::after { top: 5px; }

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

.main-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}

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

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

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

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

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

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

/* Hero */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
  color: var(--color-white);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(44, 62, 45, 0.85) 0%, rgba(44, 62, 45, 0.5) 100%);
}

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

.hero h1 {
  color: var(--color-white);
  font-size: 3.5rem;
  margin-bottom: 16px;
  max-width: 700px;
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.2rem;
  max-width: 550px;
  margin-bottom: 32px;
}

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

/* Page Banner */
.page-banner {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 60px 0;
  text-align: center;
}

.page-banner h1 {
  color: var(--color-white);
  margin-bottom: 8px;
}

.page-banner p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 0;
}

/* Cards */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.card-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card-img img {
  transform: scale(1.05);
}

.card-body {
  padding: 24px;
}

.card-body h3 {
  margin-bottom: 8px;
}

.card-body p {
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.card-link {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-primary);
}

.card-link:hover {
  color: var(--color-accent);
}

/* Category Card */
.category-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3 / 4;
}

.category-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.category-card:hover img {
  transform: scale(1.08);
}

.category-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(44, 62, 45, 0.85) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 24px;
}

.category-overlay h3 {
  color: var(--color-white);
  font-size: 1.25rem;
}

/* Feature Box */
.feature-box {
  text-align: center;
  padding: 40px 24px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--color-bg-alt);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.feature-box h3 {
  margin-bottom: 12px;
}

.feature-box p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.5rem;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.stat-item p {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0;
}

/* About */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.value-item {
  padding: 32px 24px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-accent);
}

.value-item h4 {
  margin-bottom: 8px;
}

.value-item p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* Products Page */
.product-filters {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.filter-btn {
  padding: 10px 24px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.product-category {
  margin-bottom: 64px;
}

.product-category h2 {
  margin-bottom: 8px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-accent);
}

.product-category > p {
  margin-bottom: 32px;
}

.product-moq {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-bg-alt);
  padding: 4px 12px;
  border-radius: 50px;
  margin-top: 8px;
}

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

.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--color-bg-alt);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-info-item h4 {
  margin-bottom: 4px;
}

.contact-info-item p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.contact-form {
  background: var(--color-white);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}

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

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.faq-item summary {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  color: var(--color-primary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color-accent);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 24px 20px;
  font-size: 0.9rem;
}

/* CTA Section */
.cta-section {
  background: var(--color-primary);
  color: var(--color-white);
  text-align: center;
  padding: 64px 0;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: 12px;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 24px;
}

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 64px 0 24px;
}

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

.footer-brand .logo-text {
  color: var(--color-white);
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

.footer-col h4 {
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* 5. Page-specific */
.bg-alt {
  background: var(--color-bg-alt);
}

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

/* 6. Responsive */
@media (max-width: 768px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }

  :root {
    --section-padding: 56px;
  }

  .nav-toggle-label {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .main-nav ul {
    flex-direction: column;
    padding: 16px 24px;
    gap: 0;
  }

  .main-nav li {
    width: 100%;
  }

  .main-nav a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle:checked ~ .main-nav {
    max-height: 300px;
  }

  .hero {
    min-height: 440px;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .about-content,
  .contact-grid,
  .footer-grid,
  .stats-grid,
  .values-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    gap: 32px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero h1 {
    font-size: 1.85rem;
  }

  .contact-form {
    padding: 24px;
  }

  .product-filters {
    gap: 8px;
  }

  .filter-btn {
    padding: 8px 16px;
    font-size: 0.75rem;
  }
}