/* =========================================================
   江山如画 · 古风摄影画册
   ========================================================= */

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

:root {
  --paper: #f3ead3;          /* 宣纸米黄 */
  --paper-2: #ebe0c4;        /* 深一点宣纸 */
  --paper-edge: #d8c89e;
  --ink: #2a2520;            /* 浓墨 */
  --ink-soft: #4a423b;
  --ink-light: #75695c;
  --vermilion: #b13a2f;      /* 朱砂红 */
  --vermilion-deep: #8a2a22;
  --gold: #b08c4a;
  --jade: #5b7a5a;
  --shadow: rgba(60, 40, 20, 0.18);
}

html, body {
  min-height: 100%;
  background: #e8d9b5;
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- 宣纸背景与水墨晕染 ---------- */
.paper-bg {
  position: fixed; inset: 0; z-index: -3;
  background:
    radial-gradient(ellipse at 20% 10%, #f6ecd2 0%, transparent 50%),
    radial-gradient(ellipse at 80% 90%, #efe2bd 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, #f1e6c8 0%, #e3d3a9 100%);
}
.paper-bg::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 13% 27%, rgba(120,90,50,0.07) 0 1px, transparent 2px),
    radial-gradient(circle at 67% 73%, rgba(120,90,50,0.06) 0 1px, transparent 2px),
    radial-gradient(circle at 41% 88%, rgba(120,90,50,0.05) 0 1px, transparent 2px),
    radial-gradient(circle at 85% 31%, rgba(120,90,50,0.05) 0 1px, transparent 2px);
  background-size: 7px 7px, 11px 11px, 13px 13px, 9px 9px;
  opacity: .6;
}
.ink-wash {
  position: fixed; z-index: -2; pointer-events: none;
  filter: blur(40px); opacity: .35;
}
.ink-wash-1 {
  top: -120px; left: -100px;
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(40,30,20,0.45) 0%, transparent 65%);
  border-radius: 50%;
}
.ink-wash-2 {
  bottom: -160px; right: -120px;
  width: 620px; height: 620px;
  background: radial-gradient(circle, rgba(40,30,20,0.4) 0%, transparent 65%);
  border-radius: 50%;
}

/* ---------- 卷轴标题 ---------- */
.scroll-header {
  position: relative;
  margin: 36px auto 24px;
  max-width: 1200px;
  padding: 32px 56px;
  display: flex; align-items: center; gap: 20px;
  background:
    linear-gradient(180deg, #f5ead0 0%, #ecdfb9 50%, #e3d2a3 100%);
  border: 1px solid var(--paper-edge);
  box-shadow:
    0 1px 0 rgba(255,255,255,.4) inset,
    0 0 0 1px rgba(0,0,0,.04),
    0 12px 40px -16px var(--shadow);
}
.scroll-header::before, .scroll-header::after {
  content: "";
  position: absolute; top: 8px; bottom: 8px; width: 4px;
  background: linear-gradient(180deg, transparent, var(--paper-edge) 30%, var(--paper-edge) 70%, transparent);
}
.scroll-header::before { left: 14px; }
.scroll-header::after { right: 14px; }

.scroll-rod {
  flex: 0 0 28px; height: 110px;
  background:
    repeating-linear-gradient(180deg,
      #6b4a26 0 4px, #8a5d2f 4px 9px, #5a3d1e 9px 13px);
  border-radius: 14px;
  box-shadow:
    inset 0 0 0 2px #2c1c0a,
    inset 0 0 0 3px #c4a06a,
    0 4px 14px -4px var(--shadow);
  position: relative;
}
.scroll-rod::before, .scroll-rod::after {
  content: ""; position: absolute; left: -6px; right: -6px; height: 6px;
  background: radial-gradient(ellipse, #c4a06a 0%, #6b4a26 70%);
  border-radius: 50%;
  box-shadow: 0 1px 2px rgba(0,0,0,.4);
}
.scroll-rod::before { top: -3px; }
.scroll-rod::after { bottom: -3px; }

.scroll-content { flex: 1; text-align: center; }
.brand .title-cn {
  font-family: "Ma Shan Zheng", "STKaiti", "KaiTi", serif;
  font-size: 56px; letter-spacing: 18px;
  color: var(--ink);
  text-shadow: 0 2px 0 rgba(255,255,255,.4);
  margin-left: 18px; /* compensate for letter-spacing */
}
.brand .subtitle {
  margin-top: 10px;
  font-family: "ZCOOL XiaoWei", serif;
  color: var(--ink-soft);
  letter-spacing: 8px; font-size: 15px;
  margin-left: 8px;
}
.title-divider {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  margin-top: 14px;
}
.title-divider .line {
  width: 80px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--ink-light), transparent);
}
.title-divider .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--vermilion);
  box-shadow: 0 0 0 2px var(--paper-2);
}

/* ---------- 主区 ---------- */
.main {
  max-width: 1200px;
  margin: 0 auto 60px;
  padding: 0 28px;
}

/* ---------- 印章 + 分类 ---------- */
.filter-section {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 28px;
  align-items: center;
  background: rgba(243, 234, 211, 0.55);
  border: 1px solid rgba(216, 200, 158, 0.7);
  border-radius: 4px;
  padding: 22px 28px;
  margin-bottom: 32px;
  box-shadow: 0 4px 18px -8px var(--shadow);
  position: relative;
}
.filter-section::before {
  content: ""; position: absolute; inset: 6px;
  border: 1px dashed rgba(176, 140, 74, 0.35);
  border-radius: 2px; pointer-events: none;
}

.seal {
  width: 92px; height: 92px;
  display: flex; align-items: center; justify-content: center;
  background: var(--vermilion);
  color: #fff5e0;
  font-family: "Ma Shan Zheng", serif;
  font-size: 28px; line-height: 1.05;
  letter-spacing: 4px;
  text-align: center;
  border-radius: 6px;
  transform: rotate(-4deg);
  box-shadow:
    inset 0 0 0 3px #fff5e0,
    inset 0 0 0 4px var(--vermilion),
    0 4px 10px -2px rgba(177, 58, 47, 0.4),
    0 0 0 1px var(--vermilion-deep);
  position: relative;
}
.seal::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(0,0,0,.15) 0 1px, transparent 2px) 0 0/6px 6px,
              radial-gradient(circle at 70% 60%, rgba(0,0,0,.1) 0 1px, transparent 2px) 0 0/8px 8px;
  border-radius: 6px;
  mix-blend-mode: multiply;
  opacity: .5;
}

.filter-wrap { display: flex; flex-direction: column; gap: 12px; }

.section-title {
  font-family: "ZCOOL XiaoWei", serif;
  font-size: 14px; letter-spacing: 6px;
  color: var(--ink-light);
  padding-left: 4px;
}

.filter-bar {
  display: flex; align-items: center; flex-wrap: wrap; gap: 6px;
}
.filter-btn {
  appearance: none; cursor: pointer;
  background: transparent;
  border: 1px solid transparent;
  font-family: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  font-size: 18px; letter-spacing: 4px;
  color: var(--ink-soft);
  padding: 8px 22px;
  border-radius: 2px;
  transition: all .25s ease;
  position: relative;
}
.filter-btn:hover {
  color: var(--vermilion);
  background: rgba(255,255,255,.25);
}
.filter-btn.active {
  color: #fff5e0;
  background: var(--ink);
  border-color: var(--ink);
  box-shadow: 0 2px 8px -2px var(--shadow);
}
.filter-btn.active::before, .filter-btn.active::after {
  content: ""; position: absolute; top: 50%; width: 4px; height: 4px;
  background: var(--vermilion); border-radius: 50%;
  transform: translateY(-50%);
}
.filter-btn.active::before { left: 8px; }
.filter-btn.active::after { right: 8px; }

.filter-sep {
  color: var(--ink-light); opacity: .5; font-size: 18px;
  user-select: none;
}

.filter-meta {
  display: flex; align-items: center; gap: 10px;
  font-family: "ZCOOL XiaoWei", serif;
  color: var(--ink-light);
  font-size: 13px; letter-spacing: 2px;
  padding-left: 4px;
}
.meta-sep { opacity: .4; }

/* ---------- 画册列表 ---------- */
.gallery-wrap {
  background: rgba(243, 234, 211, 0.5);
  border: 1px solid rgba(216, 200, 158, 0.7);
  border-radius: 4px;
  padding: 28px;
  box-shadow: 0 6px 24px -10px var(--shadow);
  position: relative;
}
.gallery-wrap::before {
  content: ""; position: absolute; inset: 6px;
  border: 1px dashed rgba(176, 140, 74, 0.28);
  border-radius: 2px; pointer-events: none;
}

.gallery-scroll { position: relative; }

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 14px;
  justify-items: center;
}

/* 单个缩略图：宣纸卡片 */
.thumb {
  width: 80px; height: 80px;
  position: relative;
  cursor: pointer;
  background: #fff8e3;
  padding: 4px;
  border: 1px solid var(--paper-edge);
  box-shadow:
    0 1px 2px rgba(60,40,20,.18),
    0 4px 10px -4px var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  overflow: hidden;
  /* 随机微小旋转 */
}
.thumb::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.4) 0%, transparent 30%, transparent 70%, rgba(0,0,0,.05) 100%);
  pointer-events: none;
}
.thumb img {
  display: block; width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
.thumb .thumb-title {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 12px 4px 2px;
  font-size: 10px; letter-spacing: 1px;
  color: #fff5e0;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,.7));
  text-align: center;
  font-family: "ZCOOL XiaoWei", serif;
  opacity: 0;
  transition: opacity .25s ease;
  pointer-events: none;
}
.thumb:hover {
  transform: translateY(-2px) rotate(0deg) !important;
  border-color: var(--vermilion);
  box-shadow: 0 6px 16px -4px var(--shadow), 0 0 0 1px var(--vermilion);
  z-index: 2;
}
.thumb:hover img { transform: scale(1.08); }
.thumb:hover .thumb-title { opacity: 1; }

.empty-state {
  text-align: center;
  padding: 80px 0;
  color: var(--ink-light);
  font-family: "ZCOOL XiaoWei", serif;
  letter-spacing: 4px;
  font-size: 16px;
}

/* ---------- Lightbox：原位放大覆盖层 ---------- */
/* 默认隐藏：用 display:none 而非依赖 hidden 属性，避免被 display:flex 覆盖 */
.lightbox {
  position: fixed; inset: 0; z-index: 100;
  display: none;
  align-items: center; justify-content: center;
}
/* 打开时显示 + 入场动画 */
.lightbox.is-open {
  display: flex;
  animation: lbFadeIn .25s ease;
}
.lightbox.is-open .lightbox-stage {
  animation: lbScaleIn .3s cubic-bezier(.2,.7,.3,1.1);
}
@keyframes lbFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes lbScaleIn {
  from { opacity: 0; transform: scale(.92); }
  to   { opacity: 1; transform: scale(1); }
}
.lightbox-mask {
  position: absolute; inset: 0;
  background: rgba(20, 14, 8, 0.75);
  backdrop-filter: blur(2px);
}

.lightbox-stage {
  position: relative;
  width: min(92vw, 1000px);
  max-height: 90vh;
  display: flex; align-items: center; justify-content: center;
}

.lightbox-frame {
  background:
    linear-gradient(180deg, #f5ead0 0%, #ecdfb9 100%);
  border: 1px solid var(--paper-edge);
  padding: 18px;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,.6), 0 0 0 1px rgba(255,255,255,.05);
  max-width: 100%;
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
}
.lightbox-frame::before, .lightbox-frame::after {
  content: ""; position: absolute; width: 4px; top: 10px; bottom: 10px;
  background: linear-gradient(180deg, transparent, var(--paper-edge) 30%, var(--paper-edge) 70%, transparent);
}
.lightbox-frame::before { left: 4px; }
.lightbox-frame::after { right: 4px; }

.lightbox-image {
  background: #000;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  min-height: 200px;
}
.lightbox-image img {
  display: block;
  max-width: min(86vw, 940px);
  max-height: 68vh;
  width: auto; height: auto;
  object-fit: contain;
  box-shadow: 0 8px 30px -8px rgba(0,0,0,.5);
}

.lightbox-caption {
  text-align: center;
  padding: 4px 20px 6px;
}
.cap-poem {
  font-family: "Ma Shan Zheng", "STKaiti", serif;
  color: var(--ink);
  font-size: 24px; letter-spacing: 8px;
  margin-bottom: 8px;
}
.cap-meta {
  font-family: "ZCOOL XiaoWei", serif;
  color: var(--ink-light);
  font-size: 13px; letter-spacing: 3px;
  display: flex; justify-content: center; align-items: center; gap: 10px; flex-wrap: wrap;
}
.cap-title { color: var(--vermilion); font-weight: 500; }
.cap-divider { opacity: .5; }

/* 控制按钮 */
.lightbox-close, .lightbox-nav {
  appearance: none; cursor: pointer;
  background: rgba(245, 234, 208, 0.9);
  border: 1px solid var(--paper-edge);
  color: var(--ink);
  font-family: serif;
  font-size: 24px;
  width: 42px; height: 42px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  transition: all .2s ease;
  box-shadow: 0 4px 10px -2px rgba(0,0,0,.4);
  z-index: 2;
}
.lightbox-close:hover, .lightbox-nav:hover {
  background: var(--vermilion);
  color: #fff5e0;
  border-color: var(--vermilion-deep);
}
.lightbox-close {
  position: absolute; top: -16px; right: -16px;
  width: 36px; height: 36px;
  font-size: 22px;
}
.lightbox-nav { position: absolute; top: 50%; transform: translateY(-50%); }
.lightbox-prev { left: -56px; }
.lightbox-next { right: -56px; }
.lightbox-nav:disabled {
  opacity: .35; cursor: not-allowed;
  background: rgba(245, 234, 208, 0.6);
  color: var(--ink-light);
}

/* ---------- 页脚 ---------- */
.site-footer {
  text-align: center;
  padding: 24px 16px 36px;
  color: var(--ink-light);
  font-family: "ZCOOL XiaoWei", serif;
  letter-spacing: 6px;
  font-size: 13px;
  opacity: .7;
}

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .scroll-header { margin: 18px 12px 16px; padding: 20px 18px; }
  .scroll-rod { flex-basis: 14px; height: 70px; }
  .brand .title-cn { font-size: 36px; letter-spacing: 10px; }
  .brand .subtitle { font-size: 12px; letter-spacing: 4px; }
  .main { padding: 0 12px; }
  .filter-section {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 18px;
  }
  .seal { margin: 0 auto; width: 72px; height: 72px; font-size: 22px; }
  .filter-btn { font-size: 15px; padding: 6px 14px; letter-spacing: 2px; }
  .gallery { grid-template-columns: repeat(auto-fill, minmax(70px, 1fr)); gap: 10px; }
  .thumb { width: 70px; height: 70px; }
  .lightbox-prev { left: 8px; }
  .lightbox-next { right: 8px; }
  .lightbox-close { top: 8px; right: 8px; }
  .cap-poem { font-size: 18px; letter-spacing: 4px; }
}

/* 缩略图入场动画 */
.thumb { animation: thumbIn .4s ease both; }
@keyframes thumbIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}