/* ===== 古风书法展厅 · 水墨风格 ===== */
:root {
  --ink: #2b2620;
  --ink-light: #6b6358;
  --ink-faint: #9a9082;
  --paper: #faf5ea;
  --paper-dim: #f0e8d8;
  --paper-warm: #f5ede0;
  --sepia: #8b7355;
  --sepia-bright: #a0825a;
  --vermilion: #b84038;
  --vermilion-bright: #c44536;
  --bg: #f5f0e6;
  --bg2: #ede5d5;
  --border: rgba(120,100,70,0.22);
  --shadow: rgba(80,60,30,0.12);
  --serif: "STKaiti", "KaiTi", "楷体", "Noto Serif CJK SC", serif;
  --sans: "STSong", "SimSun", "宋体", "Noto Serif CJK SC", serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  -webkit-tap-highlight-color: transparent;
  touch-action: pan-x pan-y;
}

#app {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(139,115,85,0.06), transparent 70%),
    var(--bg);
}

/* ===== 主题横幅 ===== */
.banner-wrap {
  position: relative;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  overflow: hidden;
}
.banner-img {
  display: block;
  width: 100%;
  height: auto;
}
.intro-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 2px;
  color: #fff;
  background: var(--vermilion);
  border: 1px solid var(--sepia);
  border-radius: 4px;
  padding: 8px 18px;
  cursor: pointer;
  transition: all 0.2s;
  z-index: 10;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.intro-btn:hover, .intro-btn:active {
  background: var(--vermilion-bright);
  border-color: var(--sepia-bright);
  box-shadow: 0 3px 12px rgba(184,64,56,0.3);
}

/* ===== 分类导航 ===== */
.cat-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(250,245,234,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 6px var(--shadow);
}
.cat-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--serif);
  font-size: 16px;
  letter-spacing: 2px;
  color: var(--ink-light);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 8px 22px;
  cursor: pointer;
  transition: all 0.25s;
}
.cat-tab:hover { color: var(--ink); }
.cat-tab.active {
  color: var(--vermilion);
  background: rgba(184,64,56,0.08);
  border-color: rgba(184,64,56,0.3);
}
.cat-count {
  font-size: 12px;
  color: var(--ink-faint);
  background: rgba(120,100,70,0.1);
  border-radius: 10px;
  padding: 2px 8px;
}
.cat-tab.active .cat-count {
  color: var(--vermilion);
  background: rgba(184,64,56,0.12);
}

/* ===== 作品网格 ===== */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 16px;
  max-width: 1200px;
  margin: 0 auto;
  scroll-margin-top: 60px;
}

/* 分组标题 */
.group-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 22px 0 8px;
}
.group-header:first-child {
  padding-top: 4px;
}
.group-title {
  font-family: var(--serif);
  font-size: 17px;
  color: var(--vermilion);
  letter-spacing: 4px;
  white-space: nowrap;
}
.group-count {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 1px;
  white-space: nowrap;
}
.group-line {
  flex: 1;
  max-width: 80px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--sepia), transparent);
}

.card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 4px var(--shadow);
}
.card:hover, .card:active {
  border-color: var(--sepia);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(80,60,30,0.18);
}
.card-img-wrap {
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: var(--paper-dim);
  position: relative;
}
.card-img-wrap.is-loading::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(139,115,85,0.1), transparent);
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}
.card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  transition: transform 0.3s, opacity 0.4s ease-out;
}
.card-img-wrap img.loaded {
  opacity: 1;
}
.card:hover .card-img-wrap img.loaded { transform: scale(1.04); }
.card-info {
  padding: 8px 10px;
  text-align: center;
}
.card-author {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--ink);
  letter-spacing: 1px;
}
.card-award {
  font-size: 11px;
  color: var(--vermilion);
  margin-top: 2px;
}

/* ===== 预览弹层 ===== */
.viewer {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}
.viewer-bg {
  position: absolute;
  inset: 0;
  background: rgba(30,26,20,0.88);
  backdrop-filter: blur(6px);
}
.viewer-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 105;
  width: 42px;
  height: 42px;
  font-size: 28px;
  line-height: 1;
  color: #fff;
  background: var(--vermilion);
  border: 1px solid var(--sepia);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.viewer-close:hover { background: var(--vermilion-bright); }
.viewer-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 105;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 68px;
  background: rgba(250,245,234,0.9);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.viewer-arrow:hover { background: rgba(184,64,56,0.12); }
.viewer-arrow svg {
  width: 28px; height: 28px;
  fill: none; stroke: var(--ink);
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.viewer-prev { left: 16px; }
.viewer-next { right: 16px; }
.viewer-main {
  position: relative;
  z-index: 102;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 90vw;
  max-height: 100vh;
}
.viewer-frame {
  background: linear-gradient(135deg, #8b7355, #6b5535);
  border: 3px solid var(--sepia);
  border-radius: 4px;
  padding: 10px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
  overflow: hidden;
}
.viewer-frame img {
  display: block;
  max-width: 80vw;
  max-height: 88vh;
  object-fit: contain;
  background: var(--paper);
  transition: opacity 0.25s, transform 0.2s ease-out;
  transform-origin: center center;
  touch-action: none;
  will-change: transform;
}
.viewer-frame img.zooming {
  transition: opacity 0.25s;
}
.viewer-frame img.fade {
  opacity: 0;
}
/* 卷轴装裱模式：去除画框，卷轴自带边框 */
.viewer-frame.scroll-mode {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
}
.viewer-frame.scroll-mode img {
  max-width: 85vw;
  max-height: 92vh;
}
/* 相框装裱模式：去除画框，相框图自带边框 */
.viewer-frame.frame-mode {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
}
.viewer-frame.frame-mode img {
  max-width: 85vw;
  max-height: 92vh;
}
.viewer-bottom {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 103;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.viewer-index {
  font-family: var(--serif);
  font-size: 13px;
  color: rgba(250,245,234,0.5);
  letter-spacing: 1px;
}
.viewer-info-btn {
  padding: 8px 24px;
  font-family: var(--serif);
  font-size: 14px;
  color: #fff;
  background: rgba(184,64,56,0.82);
  border: 1px solid var(--sepia);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
  backdrop-filter: blur(4px);
  letter-spacing: 2px;
}
.viewer-info-btn:hover {
  background: rgba(184,64,56,0.95);
}
.viewer-info-overlay {
  position: absolute;
  inset: 0;
  z-index: 110;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
}
.viewer-info-card {
  position: relative;
  background: var(--paper);
  border: 2px solid var(--sepia);
  border-radius: 8px;
  padding: 28px 32px 24px;
  max-width: 80vw;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  font-family: var(--serif);
  animation: vi-pop 0.2s ease-out;
}
@keyframes vi-pop {
  from { transform: scale(0.92); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.viewer-info-close {
  position: absolute;
  top: 6px;
  right: 8px;
  width: 32px;
  height: 32px;
  font-size: 22px;
  line-height: 1;
  color: var(--ink);
  background: transparent;
  border: none;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s;
}
.viewer-info-close:hover { opacity: 1; }
.viewer-info-card .vi-line {
  display: flex;
  gap: 6px;
  font-size: 15px;
  color: var(--ink);
  letter-spacing: 1px;
  line-height: 1.8;
}
.viewer-info-card .vi-label {
  color: var(--vermilion);
  white-space: nowrap;
}
.viewer-info-card .vi-index {
  font-size: 13px;
  color: rgba(0,0,0,0.4);
  margin-top: 8px;
  text-align: center;
}

/* ===== 活动介绍弹层 ===== */
.intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 110;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(30,26,20,0.55);
  backdrop-filter: blur(6px);
  padding: 20px;
}
.intro-box {
  position: relative;
  max-width: 600px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  background: var(--paper);
  border: 2px solid var(--sepia);
  border-radius: 8px;
  padding: 32px 28px;
  box-shadow: 0 12px 48px rgba(80,60,30,0.25);
}
.intro-box::-webkit-scrollbar { width: 6px; }
.intro-box::-webkit-scrollbar-thumb { background: rgba(139,115,85,0.3); border-radius: 3px; }
.intro-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  font-size: 24px;
  line-height: 1;
  color: #fff;
  background: var(--vermilion);
  border: 1px solid var(--sepia);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.intro-close:hover { background: var(--vermilion-bright); }
.intro-box h2 {
  font-family: var(--serif);
  font-size: 24px;
  color: var(--vermilion);
  letter-spacing: 4px;
  text-align: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.intro-box h3 {
  font-family: var(--serif);
  font-size: 17px;
  color: var(--sepia);
  letter-spacing: 2px;
  margin: 18px 0 8px;
}
.intro-content p {
  font-size: 14px;
  line-height: 2;
  color: var(--ink-light);
  margin-bottom: 12px;
  text-indent: 2em;
  text-align: justify;
}
.intro-content .intro-verse {
  text-align: center;
  margin: 8px 0 20px;
}
.intro-content .intro-verse p {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 2;
  color: var(--ink);
  letter-spacing: 3px;
  text-indent: 0;
  text-align: center;
  margin-bottom: 4px;
}
.intro-content strong {
  color: var(--vermilion);
}

/* ===== 加载 ===== */
.loading {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--bg);
  transition: opacity 0.4s;
}
.loading.hide { opacity: 0; pointer-events: none; }
.loading-spin {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(139,115,85,0.2);
  border-top-color: var(--vermilion);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading p {
  font-family: var(--serif);
  letter-spacing: 3px;
  color: var(--sepia);
}

/* ===== 移动端适配 ===== */
@media (min-width: 768px) {
  .gallery {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding: 20px;
  }
  .card-author { font-size: 15px; }
}
@media (min-width: 1024px) {
  .gallery {
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }
}
@media (max-width: 640px) {
  .gallery { gap: 10px; padding: 12px; }
  .card-info { padding: 10px 8px; }
  .card-author { font-size: 15px; }
  .card-award { font-size: 12px; }
  .intro-btn { font-size: 14px; padding: 8px 14px; top: 10px; right: 10px; }
  .cat-tab { font-size: 15px; padding: 8px 16px; }
  .cat-count { font-size: 12px; }
  .viewer-arrow { width: 44px; height: 56px; }
  .viewer-arrow svg { width: 24px; height: 24px; }
  .viewer-frame img { max-width: 92vw; max-height: 88vh; }
  .viewer-frame.scroll-mode img { max-width: 95vw; max-height: 92vh; }
  .viewer-frame.frame-mode img { max-width: 95vw; max-height: 92vh; }
  .viewer-info-btn { font-size: 14px; padding: 8px 20px; }
  .viewer-info-card .vi-line { font-size: 15px; }
  .viewer-prev { left: 8px; }
  .viewer-next { right: 8px; }
  .intro-box { padding: 24px 18px; }
  .intro-box h2 { font-size: 22px; }
  .intro-box h3 { font-size: 17px; }
  .intro-content p { font-size: 15px; }
  .intro-content .intro-verse p { font-size: 16px; }
  .loading p { font-size: 15px; }
}
@media (max-width: 380px) {
  .gallery { gap: 8px; padding: 10px; }
  .card-author { font-size: 14px; }
  .card-award { font-size: 11px; }
  .cat-tab { font-size: 14px; padding: 6px 12px; }
  .intro-btn { font-size: 13px; padding: 6px 12px; }
  .viewer-info-card .vi-line { font-size: 14px; }
  .intro-content p { font-size: 14px; }
}