/* ==========================================================================
   OCAC — Open Contemporary Art Center
   Modern CSS rebuild preserving the original black & white gallery aesthetic
   ========================================================================== */

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

:root {
  --black: #000;
  --white: #fff;
  --gray: #999;
  --gray-light: #eee;
  --gray-border: #ccc;
  --brown-dark: #231815;
  --font-display: 'Inter', 'Noto Sans TC', '微軟正黑體', 'LiHei Pro', Arial, sans-serif;
  --font-body: 'Noto Sans TC', 'Inter', '微軟正黑體', 'LiHei Pro', Arial, sans-serif;
  --font-en: 'Inter', Arial, sans-serif;
  --container: 1060px;
  --gutter: 20px;
  --transition: 0.3s ease;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--black);
  background: var(--white);
  line-height: 1.7;
}

.lang-en body, .lang-en { font-family: var(--font-en); }

a {
  color: var(--black);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--gray); }

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

/* --- Container --- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--white);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo img { height: 28px; width: auto; }
.logo-mobile { display: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 0;
  align-items: center;
}

.nav-item a {
  display: block;
  padding: 8px 14px;
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.nav-item a:hover,
.nav-item.is-active a {
  border-bottom-color: var(--black);
}

/* Language Switch */
.lang-switch {
  display: flex;
  align-items: center;
  margin-left: 16px;
  font-size: 14px;
  font-weight: 700;
}

.lang-current { color: var(--black); }
.lang-sep { margin: 0 6px; color: var(--gray); }
.lang-link { color: var(--gray); }
.lang-link:hover { color: var(--black); }

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--black);
  position: absolute;
  left: 0;
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 9px; }
.menu-toggle span:nth-child(3) { top: 18px; }

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* ==========================================================================
   Homepage
   ========================================================================== */
.home-section {
  padding: 40px 0;
}

.home-section .section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 30px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--black);
}

.section-title {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.section-more {
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--gray);
}

.section-more:hover { color: var(--black); }

/* ==========================================================================
   Grid — Masonry-like with CSS columns/grid
   ========================================================================== */
.items-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
}

.item-card {
  background: var(--white);
  overflow: hidden;
  transition: opacity var(--transition);
}

.item-card a {
  display: block;
}

.item-thumb {
  position: relative;
  overflow: hidden;
  background: var(--gray-light);
  aspect-ratio: 4 / 3;
}

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

.item-card:hover .item-thumb img {
  transform: scale(1.03);
}

.item-info {
  padding: 16px 10px 24px;
}

.item-date {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0;
  color: var(--black);
  margin-bottom: 4px;
}

.item-title {
  font-size: 15px;
  font-weight: 900;
  line-height: 1.5;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition);
  display: inline;
}

.item-card:hover .item-title {
  border-bottom-color: var(--gray);
}

.item-intro {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--black);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.lang-zh .item-intro { text-align: justify; }
.lang-en .item-intro { text-align: left; }

/* ==========================================================================
   Section List (Archive, Artists, Art Spaces)
   ========================================================================== */
.section-page {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-header {
  padding: 40px 0 20px;
  border-bottom: 1px solid var(--black);
  margin-bottom: 30px;
}

.page-title {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* Tag/Category Filters */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: center;
  margin-bottom: 30px;
  font-size: 12px;
  letter-spacing: 1px;
}

.filter-bar a {
  padding: 6px 12px;
  color: var(--gray);
  transition: color var(--transition);
}

.filter-bar a:hover,
.filter-bar a.is-active {
  color: var(--black);
}

.filter-sep {
  color: var(--gray-border);
  user-select: none;
}

/* ==========================================================================
   Single Article
   ========================================================================== */
.article-page {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.article-header {
  padding: 40px 0 20px;
}

.article-title {
  font-size: 22px;
  font-weight: 900;
  line-height: 1.4;
}

.article-meta {
  margin-top: 8px;
  font-size: 13px;
  color: var(--gray);
  font-family: var(--font-en);
}

.article-body {
  padding: 30px 0 60px;
  max-width: 780px;
}

.article-body p {
  font-size: 15px;
  line-height: 27px;
  margin-bottom: 1.5em;
}

.lang-zh .article-body p { text-align: justify; }

.article-body img {
  margin: 2em 0;
}

.article-body h2 {
  font-size: 18px;
  font-weight: 900;
  margin: 2em 0 1em;
}

.article-body h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 1.5em 0 0.8em;
}

.article-body a {
  border-bottom: 1px solid var(--gray);
}

.article-body a:hover {
  border-bottom-color: var(--black);
}

/* Article with sidebar layout */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.article-sidebar {
  padding-top: 30px;
}

.sidebar-section {
  margin-bottom: 30px;
}

.sidebar-title {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--black);
  margin-bottom: 12px;
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.sidebar-tags a {
  font-size: 12px;
  padding: 4px 8px;
  border: 1px solid var(--gray-border);
  transition: border-color var(--transition), color var(--transition);
}

.sidebar-tags a:hover {
  border-color: var(--black);
}

/* Gallery */
.article-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin: 2em 0;
}

.article-gallery img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  cursor: pointer;
  transition: opacity var(--transition);
}

.article-gallery img:hover { opacity: 0.85; }

/* ==========================================================================
   About Page
   ========================================================================== */
.about-page {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px var(--gutter) 80px;
}

.about-logo {
  max-width: 400px;
  margin: 0 auto 40px;
}

.about-content {
  max-width: 700px;
  margin: 0 auto;
}

.about-content p {
  font-size: 15px;
  line-height: 27px;
  margin-bottom: 1.5em;
}

.about-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 4px;
  margin: 40px 0;
}

/* ==========================================================================
   Contact Page
   ========================================================================== */
.contact-page {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px var(--gutter) 80px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
}

.contact-info h2 {
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.contact-info p {
  font-size: 15px;
  line-height: 27px;
  margin-bottom: 1em;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid var(--black);
  padding: 8px 12px;
  font-family: inherit;
  font-size: 14px;
  margin-bottom: 12px;
  background: var(--white);
  transition: border-color var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--gray);
}

.contact-form textarea { height: 130px; resize: vertical; }

.contact-form button {
  background: var(--black);
  color: var(--white);
  border: 1px solid var(--black);
  padding: 8px 24px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.contact-form button:hover {
  background: var(--white);
  color: var(--black);
}

/* ==========================================================================
   Visit Page
   ========================================================================== */
.visit-page {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px var(--gutter) 80px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--gray-light);
  padding: 40px 0;
  margin-top: 60px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
}

.footer-logo img { height: 24px; width: auto; }

.footer-info p {
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray);
}

.footer-links {
  margin-left: auto;
}

.footer-links a {
  font-size: 12px;
  color: var(--gray);
  letter-spacing: 1px;
}

.footer-links a:hover { color: var(--black); }

.footer-copy {
  width: 100%;
  padding-top: 20px;
  border-top: 1px solid var(--gray-light);
}

.footer-copy p {
  font-size: 11px;
  color: var(--gray);
}

/* ==========================================================================
   Pagination
   ========================================================================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4px;
  padding: 40px 0;
  font-family: var(--font-en);
  font-size: 13px;
}

.pagination a, .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid transparent;
}

.pagination a:hover { border-color: var(--black); }
.pagination .active {
  border-color: var(--black);
  font-weight: 900;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .items-grid { grid-template-columns: repeat(3, 1fr); }
  .article-layout { grid-template-columns: 1fr 240px; }
}

@media (max-width: 768px) {
  .header-inner { padding: 15px var(--gutter); }

  .logo-desktop { display: none; }
  .logo-mobile { display: block; }

  .menu-toggle { display: block; }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-light);
    flex-direction: column;
    padding: 20px;
  }

  .site-nav.is-open { display: flex; }

  .nav-list {
    flex-direction: column;
    width: 100%;
  }

  .nav-item a {
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-light);
    width: 100%;
  }

  .lang-switch {
    margin-left: 0;
    margin-top: 16px;
    padding: 12px 0;
  }

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

  .article-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 480px) {
  .items-grid { grid-template-columns: 1fr; }
  .article-title { font-size: 20px; }
}

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

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

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 40px;
  height: 40px;
  background: var(--black);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  cursor: pointer;
  border: none;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--gray);
}

/* No results */
.no-results {
  padding: 80px 20px;
  text-align: center;
  color: var(--gray);
  font-size: 14px;
}