/**
 * Portfolio Homepage Styles
 * VULCA - Art Criticism Exhibition Platform
 */

/* ==================== CSS Variables ==================== */
:root {
  /* Brand Colors */
  --color-primary: #B85C3C;    /* Terracotta */
  --color-accent: #D4A574;      /* Gold */
  --color-dark: #2d2d2d;
  --color-light: #f9f9f9;

  /* Status Colors */
  --color-live: #2ecc71;
  --color-upcoming: #3498db;
  --color-archived: #95a5a6;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Layout */
  --max-width: 1400px;
  --card-width: 380px;
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--color-dark);
  background: #fff;
  line-height: 1.6;
}

/* Language Toggle Support */
[lang="en"] {
  display: none;
}

html[lang="en"] [lang="zh"] {
  display: none;
}

html[lang="en"] [lang="en"] {
  display: inline;
}

/* ==================== Hero Section ==================== */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: var(--spacing-lg) var(--spacing-md);
  background: linear-gradient(135deg, #B85C3C 0%, #D4A574 100%);
  color: #fff;
  text-align: center;
}

.hero-content {
  max-width: 800px;
}

.brand-title {
  margin: 0 0 var(--spacing-md) 0;
}

.brand-name {
  display: block;
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.brand-subtitle {
  display: block;
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-top: var(--spacing-sm);
  opacity: 0.95;
}

.tagline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.8;
  max-width: 700px;
  margin: 0 auto;
  opacity: 0.9;
}

/* ==================== Exhibitions Section ==================== */
.exhibitions-section {
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--color-dark);
  margin: 0;
}

/* ==================== Exhibitions Grid ==================== */
.exhibitions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--card-width), 1fr));
  gap: var(--spacing-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Loading State */
.loading-indicator {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  color: #666;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--color-border-light);
  border-top: 4px solid var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-sm);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Error State */
.error-message {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-xl);
  color: #c41e3a;
}

.error-message button {
  padding: 0.75rem 1.5rem;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-base);
  margin-top: var(--spacing-sm);
  transition: var(--transition-base);
  font-weight: var(--font-weight-medium);
}

.error-message button:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-sm);
}

/* ==================== Exhibition Card ==================== */
.exhibition-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition-slow);
  text-decoration: none;
  color: inherit;
}

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

.exhibition-card:active {
  transform: translateY(-2px);
}

/* Card Image */
.card-image-wrapper {
  position: relative;
  width: 100%;
  padding-top: 66.67%; /* 3:2 aspect ratio */
  background: var(--color-light);
  overflow: hidden;
}

.card-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.card-image-placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
}

.placeholder-icon {
  font-size: 4rem;
  opacity: 0.3;
}

/* Status Badge */
.status-badge {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(4px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.status-badge.status-live {
  color: var(--color-live);
  border: 1px solid var(--color-live);
}

.status-badge.status-upcoming {
  color: var(--color-upcoming);
  border: 1px solid var(--color-upcoming);
}

.status-badge.status-archived {
  color: var(--color-archived);
  border: 1px solid var(--color-archived);
}

/* Card Content */
.card-content {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--color-dark);
}

.card-description {
  font-size: 1rem;
  line-height: 1.6;
  color: #666;
  margin: 0 0 var(--spacing-md) 0;
  flex: 1;
}

/* Card Stats */
.card-stats {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid #e0e0e0;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: 0.75rem;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Card Footer */
.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

.card-year {
  color: #999;
  font-weight: 500;
}

.card-cta {
  color: var(--color-primary);
  font-weight: 600;
  transition: transform 0.2s ease;
}

.exhibition-card:hover .card-cta {
  transform: translateX(4px);
}

/* Placeholder Card */
.placeholder-card {
  border: 2px dashed var(--color-border);
  background: var(--color-light);
  cursor: default;
}

.placeholder-card:hover {
  transform: none;
  box-shadow: var(--shadow-md);
}

.placeholder-card .card-title {
  color: #999;
}

.placeholder-card .card-description {
  color: #bbb;
}

.placeholder-card .placeholder-icon {
  font-size: 6rem;
  opacity: 0.2;
}

/* ==================== Footer ==================== */
.footer {
  padding: var(--spacing-lg) var(--spacing-md);
  background: var(--color-light);
  border-top: 1px solid #e0e0e0;
  text-align: center;
}

.footer-text {
  margin: 0 0 var(--spacing-sm) 0;
  color: #666;
  font-size: 0.9rem;
}

.footer-nav {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  align-items: center;
}

.footer-nav a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* ==================== Responsive Design ==================== */

/* Tablet (768px) */
@media (max-width: 768px) {
  :root {
    --card-width: 300px;
  }

  .hero {
    min-height: 50vh;
    padding: var(--spacing-md);
  }

  .exhibitions-section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .exhibitions-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .card-stats {
    gap: var(--spacing-sm);
  }
}

/* Mobile (480px) */
@media (max-width: 480px) {
  .brand-name {
    font-size: 3rem;
  }

  .brand-subtitle {
    font-size: 1rem;
  }

  .tagline {
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .card-content {
    padding: var(--spacing-sm);
  }

  .card-title {
    font-size: 1.25rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

/* ==================== HAMBURGER MENU FIX ==================== */
/* Ensure hamburger menu is visible on homepage */
.hamburger {
  display: flex !important;
  flex-direction: column;
  gap: 4px;
}

.hamburger span {
  display: block !important;
  width: 20px !important;
  height: 2px !important;
  min-height: 2px !important;
  background-color: var(--color-dark) !important;
  border-radius: 1px;
}