@font-face {
  font-family: 'FZYDSPTJW';
  src: url('FZJiYDSPTJW.TTF') format('truetype');
}

:root {
  --bg-overlay: rgba(8, 16, 20, 0.8);
  --accent: #2fd1c9;
  --accent-dark: #1b8881;
  --text-primary: #f7f7f2;
  --text-muted: #c5c9c7;
  --card-bg: rgba(51, 68, 121, 0.40);
  --border-color: rgba(255, 255, 255, 0.2);
  --shadow-soft: 0 20px 45px rgba(0, 0, 0, 0.45);
  /* unified viewer/relations width */
  --viewer-max-width: 1000px; /* change this to adjust both viewer and relation-card */
  --viewer-side-gutter: 6vw;
  font-family: 'FZYAYH', sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text-primary);
  background: url("bg.jpg") center top repeat-y;
  background-size: 100% auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.25) rgba(255, 255, 255, 0.05);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top, rgba(47, 209, 201, 0.15), transparent 60%);
  pointer-events: none;
  z-index: -1;
}

.page-wrapper {
  /* backdrop-filter: blur(3px); */
}

.site-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 3vw;
  /* Glass / translucent header */
  background: transparent;
  background-color: transparent;
  /* -webkit-backdrop-filter: blur(12px); */
  /* backdrop-filter: blur(18px); */

  box-shadow: none;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.logo-placeholder {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  padding: 3px;
}

.logo-placeholder img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}

.brand-text span {
  font-size: 1.1rem;
  letter-spacing: 0.12em;
}

.publisher-text {
  font-size: 1.2rem;
  letter-spacing: 0.15em;
  color: rgb(182, 12, 36); /* #B60C24 */
  font-weight: 600;
  text-align: center;
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.header-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: none;
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 0.9rem;
  min-width: 34px;
  height: 34px;
  padding: 0 0.9rem;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.55);
  white-space: nowrap;
  transition: all 0.25s ease;
}

.header-icon-btn .icon {
  font-size: 1.05rem;
}

/* 搜索和导航按钮统一视觉风格 */
.menu-toggle,
.search-toggle {

}

.header-icon-btn:hover {
  background: rgba(47, 209, 201, 0.18);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.menu-label {
  font-size: 0.85rem;
  letter-spacing: 0.18em;
}

.search-dropdown {
  position: absolute;
  top: 120%;
  right: 0;
  background: var(--card-bg);
  padding: 0.4rem 0.6rem;
  border-radius: 999px;

  box-shadow: 0 10px 25px rgba(0, 0, 0, 0);
  display: none;
}

.search-dropdown.is-open {
  display: block;
}

.search-input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  min-width: 180px;
  font-size: 0.9rem;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  outline: none;
}

.scroll-container {
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(47, 209, 201, 0.5) transparent;
}

body::-webkit-scrollbar,
.scroll-container::-webkit-scrollbar {
  width: 10px;
}

body::-webkit-scrollbar-track,
.scroll-container::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 999px;
}

body::-webkit-scrollbar-thumb,
.scroll-container::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(47, 209, 201, 0.7), rgba(27, 136, 129, 0.7));
  border-radius: 999px;

}

body::-webkit-scrollbar-thumb:hover,
.scroll-container::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(47, 209, 201, 0.9), rgba(27, 136, 129, 0.9));
}

section {
  min-height: 100vh;
  padding: 2rem 6vw;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 1.5rem;
}

.hero-section {
  position: relative;
}

.hero-content {
  background: transparent;
  padding: 0.5rem 2rem 2rem;
  border-radius: 0;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border: none;
  width: 100%;
  align-items: center;
}

.artifact-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  text-align: center;
  flex-direction: column;
}

.artifact-meta h1 {
  margin: 0;
  font-size: clamp(3rem, 5vw, 4.6rem);
  font-weight: normal;
  letter-spacing: 0.08em;
  text-align: center;
  text-align-last: center;
  line-height: 1.2;
  font-family: 'FZYDSPTJW', serif;
  width: 100%;
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border: none;
  font-size: 0.88rem;
  letter-spacing: 0.26em;
  cursor: pointer;
  transition: background 0.3s, border-color 0.3s;
}

.toggle-btn:hover {
  background: var(--accent-dark);
  border-color: transparent;
}

.toggle-btn.active {
  background: var(--accent);
  color: #041010;
}

.viewer-toggle {
  position: absolute;
  top: 1.1rem;
  right: 1.2rem;
  padding: 0.55rem 1.4rem;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.45);
  /* backdrop-filter: blur(10px); */
  border-color: rgba(255, 255, 255, 0.26);
  z-index: 3;
}

.relation-card {
  margin-top: 1rem;
  display: grid;
  /* responsive, consistent sizing across pages */
  --relation-max-width: var(--viewer-max-width); /* keep relation-card same as viewer */
  --relation-item-min: 180px;
  grid-template-columns: repeat(2, minmax(200px, 1fr));
  justify-items: center;
  align-items: start;
  gap: 1.2rem;
  padding: 1.2rem 1.5rem;
  max-width: var(--relation-max-width);
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  background: var(--card-bg);
  border-radius: 18px;
  border: none;
}

.relation-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  text-align: center;
}

.relation-item .label {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.18em;
  font-weight: 500;
}

.relation-item .value {
  font-size: 1rem;
  line-height: 1.4;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.relation-connector {
  /* unified connector size */
  --relation-connector-width: 64px;
  --relation-connector-height: 2px;
  width: var(--relation-connector-width);
  height: var(--relation-connector-height);
  justify-self: center;
  align-self: center;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

/* center title within title-row while allowing side controls */
.title-row h1,
.artifact-meta h1 {
  flex: 1 1 auto;
  text-align: center;
  margin: 0;
}

@media (max-width: 900px) {
  /* hide connectors on stacked layout */
  .relation-connector {
    display: none;
  }
  .title-row h1,
  .artifact-meta h1 {
    text-align: left;
    width: 100%;
  }
}

.viewer-wrapper {
  position: relative;
  border-radius: 28px;
  overflow: hidden;
  background: transparent;
  min-height: 420px;
  display: flex;
  align-items: stretch;
  border: none;
}

/* 这里可以改展示框的尺寸 */
.viewer-wrapper {
  max-width: var(--viewer-max-width);
  margin: 0 auto;
  width: calc(100% - var(--viewer-side-gutter)); /* keep some side gutters */
}

.model-stage,
.image-stage {
  width: 100%;
  max-width: 100%;
}

model-viewer,
.lightbox-image {
  max-width: 100%;
  height: auto;
  display: block;
}

@media (max-width: 900px) {
  .viewer-wrapper {
    width: 100%;
    max-width: none;
    margin: 0;
  }
}

.model-stage,
.image-stage {
  width: 100%;
  min-height: 420px;
}

.model-stage model-viewer {
  width: 100%;
  height: 100%;
  min-height: 420px;
  cursor: grab;
  display: block;
}

.image-stage {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: transparent;
  padding: 1.5rem;
}

.image-stage img,
.lightbox-image {
  /* use the viewer max width as a guide and allow large viewport use */
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 18px;
  border: none;
  box-shadow: none;
  background: transparent;
}

.lightbox {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, rgba(0, 0, 0, 0.92), rgba(0, 0, 0, 0.98));
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
}

.lightbox-inner {
  position: relative;
  max-width: 98vw;
  max-height: 98vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: rgba(0, 0, 0, 0.45);
  width: 52px;
  height: 80px;
  border-radius: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-nav span {
  width: 16px;
  height: 16px;
  border-top: 2px solid rgba(255, 255, 255, 0.9);
  border-right: 2px solid rgba(255, 255, 255, 0.9);
  display: block;
}

.lightbox-nav.prev {
  /* 往中间收一点，避免贴得太边缘 */
  left: 2.5rem;
}

.lightbox-nav.prev span {
  transform: rotate(-135deg);
}

.lightbox-nav.next {
  /* 往中间收一点，避免贴得太边缘 */
  right: 2.5rem;
}

.lightbox-nav.next span {
  transform: rotate(45deg);
}

.lightbox-nav:hover {
  background: rgba(47, 209, 201, 0.35);
}

.viewer-instruction {
  position: absolute;
  bottom: 1.1rem;
  right: 1.2rem;
  background: rgba(0, 0, 0, 0.6);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.image-stage .gallery-indicator {
  position: absolute;
  bottom: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.9rem;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.4);
  padding: 0.4rem 1rem;
  border-radius: 999px;
}

.gallery-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: rgba(0, 0, 0, 0.35);
  width: 48px;
  height: 72px;
  border-radius: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, transform 0.3s;
}

.gallery-nav span {
  width: 14px;
  height: 14px;
  border-top: 2px solid rgba(255, 255, 255, 0.85);
  border-right: 2px solid rgba(255, 255, 255, 0.85);
  display: block;
}

.gallery-nav.prev {
  /* 浏览模式下左右箭头往中间收一些 */
  left: 3rem;
}

.gallery-nav.prev span {
  transform: rotate(-135deg);
}

.gallery-nav.next {
  /* 浏览模式下左右箭头往中间收一些 */
  right: 3rem;
}

.gallery-nav.next span {
  transform: rotate(45deg);
}

.gallery-nav:hover {
  background: rgba(47, 209, 201, 0.35);
  transform: translateY(-50%) scale(1.05);
}

.gallery-nav:active {
  transform: translateY(-50%) scale(0.97);
}

.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.audio-module {
  background: var(--card-bg);
  padding: 1rem 1.5rem;
  border-radius: 18px;
  border: none;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.audio-module p {
  margin: 0;
  letter-spacing: 0.2em;
  color: var(--text-muted);
}

audio {
  width: 100%;
  filter: drop-shadow(0 5px 18px rgba(0, 0, 0, 0.45));
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  letter-spacing: 0.28em;
  font-size: 0.85rem;
  text-transform: uppercase;
}

.arrow-stack {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  align-items: center;
  justify-content: center;
}

.chevron {
  width: 14px;
  height: 14px;

  transform: rotate(-45deg);
  animation: descend 1.6s infinite;
  filter: drop-shadow(0 0 6px rgba(47, 209, 201, 0.6));
}

.chevron.delay {
  animation-delay: 0.3s;
  opacity: 0.6;
}

.scroll-indicator small {
  letter-spacing: 0.45em;
  font-size: 0.65rem;
  color: #1b8881;
  font-weight: 600;
}

@keyframes descend {
  0% {
    transform: translateY(-4px) rotate(-45deg);
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  100% {
    transform: translateY(8px) rotate(-45deg);
    opacity: 0;
  }
}

.detail-content {
  max-width: var(--viewer-max-width);
  width: calc(100% - var(--viewer-side-gutter)); /* match viewer and relation-card width */
  margin: 0 auto;
  background: rgba(51, 68, 121, 0.40);
  padding: 2.5rem;
  border-radius: 24px;
  border: none;
  line-height: 1.8;
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.detail-content h2 {
  margin-top: 0;
  color: rgba(255, 255, 255, 0.85); /* 独立的柔和白色，不使用全局变量 */
  letter-spacing: 0.15em;
  font-size: 2rem;
}

.detail-content p {
  color: white; /* 独立的白色设置，不受其他样式影响 */
  margin-bottom: 1.5rem;
  text-indent: 2em; /* 保持中文段首缩进 */
}

@media (max-width: 900px) {
  section {
    padding: 0.8rem 6vw 2rem 6vw;
  }
  
  .site-header {
    flex-direction: column;
    gap: 0.4rem;
  }

  .logo-placeholder {
    width: 52px;
    height: 52px;
  }

  .search-wrap input {
    min-width: 140px;
  }

  .relation-card {
    grid-template-columns: 1fr;
    width: 100%;
    max-width: none;
  }

  .title-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 600px) {
  section {
    padding: 0.5rem 5vw 3rem 5vw;
  }

  .site-header {
    padding: 0.8rem 1.5rem;
  }

  .logo-placeholder {
    width: 48px; /* 56px * 0.85 ≈ 48px */
    height: 48px;
  }

  .hero-content {
    padding: 1.5rem;
  }

  .detail-content {
    padding: 1.5rem;
    width: 100%;
    max-width: none;
  }
}

/* navigation styles removed - side navigation deleted per user request */

/* Small navigation dropdown (opens from header) */
.nav-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.38);
  /* backdrop-filter: blur(2px); */
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s ease, visibility 0.18s ease;
  z-index: 900;
}

.nav-menu-overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.navigation-dropdown {
  position: fixed;
  background: var(--card-bg);
  border: none;
  box-shadow: 0 12px 30px rgba(0,0,0,0.45);
  border-radius: 12px;
  padding: 0.4rem;
  right: 3vw;
  top: 72px; /* positioned via JS on open */
  width: 320px;
  max-width: 92%;
  transform-origin: top right;
  transform: translateY(-8px) scale(0.98);
  opacity: 0;
  transition: all 0.18s ease;
  z-index: 1000;
}

.navigation-dropdown.is-open {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-item {
  display: block;
  padding: 0.7rem 0.9rem;
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 8px;
  transition: background 0.18s ease, color 0.18s ease, transform 0.12s ease;
}

.nav-item:hover {
  background: rgba(255,255,255,0.03);
  color: var(--accent);
  transform: translateY(-2px);
}

.nav-item.active {
  background: rgba(47, 209, 201, 0.12);
  color: var(--accent);
  font-weight: 600;
}

/* 分级错落样式和入场动画 */
.navigation-dropdown .nav-item {
  opacity: 0;
  transform: translateY(-8px) translateX(var(--x,0px));
  transition: opacity 220ms cubic-bezier(0.2,0.9,0.2,1), transform 220ms cubic-bezier(0.2,0.9,0.2,1);
}

/* JS will toggle `.shown` with staggered timers to create 错落感 */
.navigation-dropdown .nav-item.shown {
  opacity: 1;
  transform: translateY(0) translateX(0);
}

.nav-item.level-1 {
  padding-left: 0.9rem;
  font-size: 1rem;
}

.nav-item.level-2 {
  padding-left: 1.8rem;
  font-size: 0.95rem;
  background: linear-gradient(90deg, rgba(255,255,255,0.01), transparent);

  transform-origin: left;
}

/* Image magnifier lens */
.img-magnifier-lens {
  position: fixed;
  /* square lens instead of circular */
  border-radius: 8px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.55), inset 0 0 8px rgba(255,255,255,0.03);
  width: 160px;
  height: 160px;
  pointer-events: none; /* allow mouse events to pass through to image */
  background-repeat: no-repeat;
  background-position: 0 0;
  background-size: cover;
  border: none;
  z-index: 1100;
  transform: translate(-50%, -50%);
  transition: opacity 120ms ease;
  opacity: 0;
}

.lightbox.is-hidden .img-magnifier-lens { display: none; }

/* optional: small-screen reduce lens size */
@media (max-width: 480px) {
  .img-magnifier-lens {
    width: 110px;
    height: 110px;
    border-radius: 6px;
  }
}

/* cursor and active state for toggle-zoom behavior */
.lightbox-image {
  cursor: zoom-in;
  max-width: 98vw;
  max-height: 98vh;
  object-fit: contain;
}

.lightbox.zoom-active .lightbox-image {
  cursor: zoom-out;
}

.lightbox.zoom-active .img-magnifier-lens {
  opacity: 1; /* show lens when zoom active */
}

/* 宽屏优化 */
@media (min-width: 1400px) {
  :root {
    --viewer-max-width: 1200px; /* 宽屏下增加最大宽度 */
    --viewer-side-gutter: 8vw; /* 宽屏下增加侧边距 */
  }

  /* 宽屏下文物信息框方正排版 - 2x2网格 */
  .relation-card {
    grid-template-columns: 1fr 1fr; /* 保持2列布局 */
    grid-template-rows: 1fr 1fr;    /* 2行布局，形成2x2网格 */
    gap: 1.5rem;
    padding: 1.5rem 2rem;
    text-align: center; /* 居中对齐 */
  }

  .relation-item {
    display: flex;
    flex-direction: column;
    justify-content: center; /* 垂直居中 */
    align-items: center;     /* 水平居中 */
    text-align: center;
    min-height: 80px; /* 统一高度 */
  }

  .relation-item .label {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
  }

  .relation-item .value {
    font-size: 1rem;
    line-height: 1.4;
  }

  /* 隐藏连接器，因为现在是2x2网格 */
  .relation-connector {
    display: none;
  }
}

@media (min-width: 1800px) {
  :root {
    --viewer-max-width: 1400px; /* 超宽屏下进一步增加宽度 */
    --viewer-side-gutter: 10vw; /* 超宽屏下进一步增加侧边距 */
  }

  /* 超宽屏下进一步优化文物信息框 */
  .relation-card {
    gap: 2rem;
    padding: 2rem 2.5rem;
  }

  .relation-item {
    min-height: 90px;
  }

  .relation-item .label {
    font-size: 1.2rem;
  }

  .relation-item .value {
    font-size: 1.1rem;
  }
}