/* ===== 基础重置 & 变量 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #faf6f0;
  --bg-secondary: #f3ece2;
  --bg-card: #fffdf9;
  --text-primary: #2c1810;
  --text-secondary: #5c4033;
  --text-muted: #8b7355;
  --accent: #8b5e3c;
  --accent-hover: #6b4226;
  --gold: #c9a84c;
  --gold-light: #e8d48b;
  --border: #d4c4a8;
  --shadow-soft: 0 4px 20px rgba(44, 24, 16, 0.08);
  --shadow-frame:
    inset 0 0 0 3px #b8986e,
    inset 0 0 0 5px #8b6914,
    inset 0 0 0 8px #c9a84c,
    0 8px 32px rgba(44, 24, 16, 0.2);
  --radius: 4px;
  --font-display: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Cormorant Garamond', 'Times New Roman', serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color 0.8s ease, color 0.8s ease;
}

body.theme-active {
  background-color: transparent;
}

body.theme-vangogh .site-header {
  background: linear-gradient(180deg, rgba(15, 25, 50, 0.9) 0%, rgba(20, 30, 60, 0.7) 100%);
}

body.theme-monet .site-header {
  background: linear-gradient(180deg, rgba(60, 100, 80, 0.9) 0%, rgba(50, 90, 70, 0.7) 100%);
}

body.theme-vangogh .filter-bar,
body.theme-vangogh .site-footer {
  background-color: rgba(15, 25, 50, 0.85);
}

body.theme-monet .filter-bar,
body.theme-monet .site-footer {
  background-color: rgba(60, 100, 80, 0.85);
}

body.theme-vangogh .gallery {
  background-color: rgba(10, 20, 40, 0.6);
}

body.theme-monet .gallery {
  background-color: rgba(40, 80, 60, 0.5);
}

/* ===== 顶部笔触纹理装饰条 ===== */
.texture-bar {
  height: 6px;
  background: linear-gradient(
    90deg,
    var(--gold) 0%,
    var(--accent) 20%,
    var(--gold-light) 40%,
    var(--accent) 60%,
    var(--gold) 80%,
    var(--accent) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 8s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 0; }
  50% { background-position: 100% 0; }
}

/* ===== 头部 ===== */
.site-header {
  text-align: center;
  padding: 60px 20px 40px;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  position: relative;
  z-index: 2;
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.theme-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 3px solid var(--gold);
  padding: 0;
  cursor: pointer;
  overflow: hidden;
  background: none;
  transition: var(--transition);
  box-shadow: 0 2px 12px rgba(139, 94, 60, 0.2);
  flex-shrink: 0;
}

.theme-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.theme-btn:hover {
  transform: scale(1.15);
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(139, 94, 60, 0.4);
}

.theme-btn:hover img {
  transform: scale(1.1);
}

.theme-btn.active {
  border-color: #fff;
  box-shadow: 0 0 0 3px var(--gold), 0 4px 20px rgba(139, 94, 60, 0.5);
}

.site-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.03em;
  margin-bottom: 12px;
}

/* ===== 动态背景画布 ===== */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1s ease;
}

#bg-canvas.active {
  opacity: 1;
}

body.theme-active .site-header,
body.theme-active .filter-bar,
body.theme-active .gallery,
body.theme-active .empty-state,
body.theme-active .site-footer {
  position: relative;
  z-index: 1;
}

body.theme-vangogh {
  --bg-primary: rgba(25, 30, 60, 0.85);
  --text-primary: #f0e8d0;
  --text-secondary: #d4c4a8;
  --text-muted: #a0937a;
}

body.theme-monet {
  --bg-primary: rgba(220, 235, 220, 0.85);
  --text-primary: #2c3e2c;
  --text-secondary: #4a6a4a;
  --text-muted: #6a8a6a;
}

.site-subtitle {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-muted);
  font-weight: 300;
  font-style: italic;
}

/* ===== 筛选栏 ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-end;
  gap: 20px;
  padding: 24px 20px 32px;
  max-width: 900px;
  margin: 0 auto;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.filter-group label {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.filter-group select {
  appearance: none;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 10px 36px 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b7355' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  min-width: 160px;
}

.filter-group select:hover,
.filter-group select:focus {
  border-color: var(--accent);
  outline: none;
}

.btn-reset {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-reset:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ===== 画作网格 ===== */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 40px;
  padding: 20px 40px 60px;
  max-width: 1400px;
  margin: 0 auto;
}

/* ===== 画作卡片 ===== */
.painting-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}

.painting-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 16px 48px rgba(44, 24, 16, 0.15);
}

.painting-card .frame {
  margin: 16px;
  padding: 8px;
  background: linear-gradient(135deg, #d4a843 0%, #8b6914 30%, #c9a84c 50%, #8b6914 70%, #d4a843 100%);
  border-radius: 2px;
  box-shadow:
    inset 0 1px 3px rgba(0,0,0,0.3),
    0 4px 12px rgba(44, 24, 16, 0.2);
}

.painting-card .frame-inner {
  background: #1a1a1a;
  padding: 4px;
}

.painting-card img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  display: block;
  transition: transform var(--transition);
}

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

.painting-card .card-info {
  padding: 16px 20px 20px;
}

.painting-card .card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.3;
}

.painting-card .card-title-en {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.painting-card .card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.painting-card .card-artist {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.painting-card .card-year {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.painting-card .card-year::before {
  content: "·";
  margin-right: 8px;
}

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
  font-size: 1.1rem;
  font-style: italic;
}

/* ===== 模态弹窗 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 10, 5, 0.85);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border-radius: 8px;
  max-width: 960px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.4);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 2rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  z-index: 10;
  line-height: 1;
  transition: color var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.modal-image-wrap {
  background: #1a1a1a;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  min-height: 400px;
}

.modal-image-wrap img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: 2px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

.modal-info {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.modal-title-en {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--text-muted);
}

.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.modal-meta span {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-radius: 20px;
}

.meta-artist {
  font-weight: 600;
}

.modal-desc {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.modal-museum {
  margin-top: auto;
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border-left: 4px solid var(--gold);
}

.museum-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.modal-museum a {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

.museum-city {
  display: block;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ===== 页脚 ===== */
.site-footer {
  text-align: center;
  padding: 40px 20px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .gallery {
    grid-template-columns: 1fr;
    padding: 20px 16px 40px;
    gap: 24px;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 16px;
  }

  .filter-group select {
    min-width: unset;
    width: 100%;
  }

  .modal-body {
    grid-template-columns: 1fr;
  }

  .modal-image-wrap {
    min-height: 250px;
    padding: 16px;
  }

  .modal-info {
    padding: 24px 20px;
  }

  .site-header {
    padding: 40px 16px 24px;
  }
}

@media (max-width: 480px) {
  .painting-card .frame {
    margin: 10px;
    padding: 6px;
  }

  .painting-card img {
    height: 200px;
  }
}