/* ============================================
   J&C Books Public Site Stylesheet
   Mobile-first, clean, modern small-business feel
   ============================================ */

/* ---- CSS Variables ---- */
:root {
  --color-primary: #1e3a5f;
  --color-primary-dark: #152a45;
  --color-accent: #d4a017;
  --color-accent-dark: #b5860f;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-border: #e2e8f0;
  --color-white: #ffffff;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --radius: 0.5rem;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-family);
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-md);
  line-height: 1.2;
  color: var(--color-primary);
}

p {
  margin: 0 0 var(--spacing-md);
}

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

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

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

ul, ol {
  margin: 0 0 var(--spacing-md);
  padding-left: var(--spacing-lg);
}

address {
  font-style: normal;
}

/* ---- Utilities ---- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-white);
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
  padding: 0.6rem 1.2rem;
  font-size: 0.95rem;
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-white);
  text-decoration: none;
}

/* ---- Header ---- */
.site-header {
  background-color: var(--color-primary);
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo img {
  height: 44px;
  width: auto;
  display: block;
}

/* Mobile nav toggle */
.nav-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--color-white);
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease;
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* Navigation */
.main-nav {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background-color: var(--color-primary-dark);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.main-nav.is-open {
  display: block;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list > li {
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-list > li:last-child {
  border-bottom: none;
}

.nav-list a {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--color-white);
  font-weight: 500;
}

.nav-list a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* Submenu */
.submenu {
  list-style: none;
  margin: 0;
  padding: 0 0 var(--spacing-sm) var(--spacing-md);
  display: none;
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
  display: block;
}

.submenu a {
  font-weight: 400;
  font-size: 0.95rem;
  padding: var(--spacing-xs) 0;
  color: rgba(255,255,255,0.85);
}

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

/* ---- Hero ---- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.hero-lead {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.9);
  max-width: 640px;
  margin: 0 auto var(--spacing-lg);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
}

/* ---- Sections ---- */
section {
  padding: var(--spacing-xl) var(--spacing-md);
}

section:nth-child(even) {
  background-color: var(--color-bg-alt);
}

section h2 {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: var(--spacing-lg);
}

/* ---- Cards ---- */
.card-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.card h3 a {
  color: var(--color-primary);
}

.card h3 a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.card p {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

/* ---- Features ---- */
.features {
  display: grid;
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.feature {
  text-align: center;
}

.feature h4 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-primary);
}

.feature p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ---- CTA Section ---- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.cta-section h2 {
  color: var(--color-white);
}

.cta-section p {
  color: rgba(255,255,255,0.9);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

.cta-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
}

.cta-section .btn-secondary {
  color: var(--color-white);
  border-color: var(--color-white);
}

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

/* ---- Page Header ---- */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.page-header h1 {
  color: var(--color-white);
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.page-subtitle {
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--spacing-md);
}

/* ---- Breadcrumb ---- */
.breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  font-size: 0.9rem;
}

.breadcrumb li:not([aria-current])::after {
  content: '/';
  margin-left: var(--spacing-xs);
  color: rgba(255,255,255,0.5);
}

.breadcrumb a {
  color: rgba(255,255,255,0.8);
}

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

.breadcrumb [aria-current] {
  color: rgba(255,255,255,0.6);
}

/* ---- Page Content ---- */
.page-content {
  padding: var(--spacing-xl) var(--spacing-md);
}

.content-narrow {
  max-width: 720px;
  margin: 0 auto;
}

.lead {
  font-size: 1.15rem;
  color: var(--color-text-light);
}

/* ---- Guarantee List ---- */
.guarantee-list {
  list-style: none;
  padding: 0;
}

.guarantee-list li {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.guarantee-list li:last-child {
  border-bottom: none;
}

.guarantee-list strong {
  display: block;
  color: var(--color-primary);
  font-size: 1.05rem;
  margin-bottom: var(--spacing-xs);
}

/* ---- Products / Catalog ---- */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.filter-select {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-white);
  color: var(--color-text);
  cursor: pointer;
}

.filter-clear {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.filter-clear:hover {
  color: var(--color-accent);
}

.product-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.product-card:hover {
  box-shadow: var(--shadow-md);
}

.product-image {
  margin: calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg)) var(--spacing-md);
  overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
  background-color: var(--color-bg-alt);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  padding: var(--spacing-md);
}

.product-image-placeholder {
  margin: calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg)) var(--spacing-md);
  overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.placeholder-icon {
  font-size: 3rem;
  opacity: 0.4;
}

.product-title {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.product-code,
.product-meta {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.empty-state p {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

/* ---- Contact ---- */
.contact-grid {
  display: grid;
  gap: var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.contact-info h2 {
  text-align: left;
  margin-bottom: var(--spacing-md);
}

.contact-detail {
  margin-bottom: var(--spacing-lg);
}

.contact-detail h3 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.contact-detail p,
.contact-detail address {
  margin: 0;
  font-size: 1.05rem;
}

.contact-detail a {
  color: var(--color-primary);
}

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

.notice-box {
  background-color: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
}

.notice-box p {
  margin-bottom: var(--spacing-md);
}

.notice-box p:last-child {
  margin-bottom: 0;
}

.cta-inline {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

/* ---- Footer ---- */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255,255,255,0.8);
  padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

.footer-inner {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--spacing-xs);
}

.footer-tagline {
  color: rgba(255,255,255,0.7);
  margin: 0;
}

.footer-contact p {
  margin-bottom: var(--spacing-xs);
  font-size: 0.95rem;
}

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

.footer-contact a:hover {
  color: var(--color-white);
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--spacing-xs);
}

.footer-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--spacing-md);
  text-align: center;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
}

.footer-bottom p {
  margin: 0;
}

/* ---- Search Bar ---- */
.search-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  align-items: center;
}

.search-input {
  flex: 1 1 240px;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-white);
  color: var(--color-text);
}

.search-input:focus {
  outline: 2px solid var(--color-accent);
  border-color: var(--color-accent);
}

/* ---- Results Info ---- */
.results-info {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
}

/* ---- Pagination ---- */
.pagination {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.page-link {
  display: inline-block;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-primary);
  font-size: 0.95rem;
  background-color: var(--color-white);
  transition: all 0.2s ease;
}

.page-link:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  text-decoration: none;
}

.page-link.current {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  font-weight: 600;
}

.page-link.disabled {
  color: var(--color-text-light);
  background-color: var(--color-bg-alt);
  border-color: var(--color-border);
  cursor: not-allowed;
}

.page-link.disabled:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-text-light);
  border-color: var(--color-border);
}

/* ---- Swiper Carousel ---- */
.carousel-section {
  padding: var(--spacing-md) 0 0;
  background-color: var(--color-bg-alt);
}

#hero-swiper {
  max-width: 1200px;
  margin: 0 auto;
}

#hero-swiper .swiper-slide img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1138 / 400;
  object-fit: cover;
}

#hero-swiper .swiper-button-prev,
#hero-swiper .swiper-button-next {
  color: var(--color-white);
  background-color: rgba(30, 58, 95, 0.5);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  transition: background-color 0.3s ease;
}

#hero-swiper .swiper-button-prev:hover,
#hero-swiper .swiper-button-next:hover {
  background-color: rgba(30, 58, 95, 0.9);
}

#hero-swiper .swiper-button-prev::after,
#hero-swiper .swiper-button-next::after {
  font-size: 1.2rem;
}

#hero-swiper .swiper-pagination-bullet {
  background-color: rgba(255, 255, 255, 0.5);
  opacity: 1;
  width: 12px;
  height: 12px;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

#hero-swiper .swiper-pagination-bullet-active {
  background-color: var(--color-white);
  transform: scale(1.2);
}

/* ---- Banners ---- */
.banners {
  padding: var(--spacing-lg) var(--spacing-md);
  background-color: var(--color-bg);
}

.banner-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.banner img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

/* ============================================
   Tablet & Desktop (min-width: 768px)
   ============================================ */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .main-nav {
    display: block;
    position: static;
    background: transparent;
    padding: 0;
    box-shadow: none;
  }

  .nav-list {
    display: flex;
    gap: var(--spacing-lg);
  }

  .nav-list > li {
    border-bottom: none;
    position: relative;
  }

  .nav-list a {
    padding: var(--spacing-sm) 0;
  }

  .submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-sm) 0;
    min-width: 180px;
    display: none;
  }

  .has-submenu:hover .submenu,
  .has-submenu:focus-within .submenu {
    display: block;
  }

  .submenu a {
    color: var(--color-text);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }

  .submenu a:hover {
    background-color: var(--color-bg-alt);
    color: var(--color-primary);
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-actions,
  .cta-actions {
    flex-direction: row;
    justify-content: center;
  }

  .card-grid.two-up {
    grid-template-columns: repeat(2, 1fr);
  }

  .card-grid.three-up {
    grid-template-columns: repeat(3, 1fr);
  }

  .features {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* ============================================
   Large Desktop (min-width: 1024px)
   ============================================ */
@media (min-width: 1024px) {
  .hero h1 {
    font-size: 3rem;
  }

  .hero-lead {
    font-size: 1.25rem;
  }

  .page-header h1 {
    font-size: 2.5rem;
  }

  .features {
    grid-template-columns: repeat(4, 1fr);
  }

  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}