/* ===== 变量与基础 ===== */
:root {
  --nav-bg: #0a0a0a;
  --nav-text: #f5f5f5;
  --text: #2c2c2c;
  --text-muted: #8a8a8a;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --thumb-size: 72px;
  --transition-duration: 0.5s;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
html:has(body.works-body) {
  overflow-x: visible;
}

body {
  margin: 0;
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: #fff;
  min-height: 100vh;
  overflow-x: hidden;
}
body.works-body {
  --header-offset: calc(2.75rem + env(safe-area-inset-top, 0px));
  box-sizing: border-box;
  min-height: 100dvh;
  height: 100dvh;
  padding-top: var(--header-offset);
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior: none;
}

/* 首页：导航固定，避免滑动时整页跟着滚、主图不切换 */
body.works-body .site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2000;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: 0.45rem;
  padding-left: max(var(--space-xl), env(safe-area-inset-left, 0px));
  padding-right: max(var(--space-xl), env(safe-area-inset-right, 0px));
  box-sizing: border-box;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  vertical-align: middle;
}

/* ===== 顶部导航 ===== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem var(--space-xl);
  background: var(--nav-bg);
  color: var(--nav-text);
  letter-spacing: 0.12em;
}

.site-title {
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--nav-text);
}

.site-nav {
  display: flex;
  gap: var(--space-lg);
}

.nav-link {
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--nav-text);
}

.nav-link:hover {
  color: rgba(255, 255, 255, 0.7);
}

.nav-link.active {
  font-weight: 500;
}

/* ===== 首页作品区布局 ===== */
.works-page {
  display: grid;
  grid-template-columns: auto 1fr minmax(320px, 1.6fr);
  grid-template-rows: 1fr;
  align-items: center;
  gap: var(--space-xl);
  height: calc(100dvh - var(--header-offset));
  max-height: calc(100dvh - var(--header-offset));
  padding: 0 var(--space-xl) var(--space-xl) var(--space-lg);
  padding-top: 0;
  overflow: visible;
  min-width: min-content;
}

.thumb-rail {
  position: sticky;
  top: 0;
  align-self: stretch;
  max-height: calc(100dvh - var(--header-offset));
  overflow: visible;
}

/* 列表容器：仅裁剪，不原生滚动（由 JS transform 驱动，避免回流抽动） */
.thumb-list {
  position: relative;
  max-height: inherit;
  overflow: hidden;
}

.thumb-list-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-top: 2px;
  will-change: transform;
  backface-visibility: hidden;
}

.thumb-item {
  flex-shrink: 0;
  width: var(--thumb-size);
  /* 占位高度：避免未 decode 的 img 高度为 0，首屏只能看到前几项；加载后由 JS 写入真实 aspect-ratio */
  aspect-ratio: 3 / 2;
  border-radius: 2px;
  overflow: hidden;
  cursor: pointer;
  line-height: 0;
  transition: opacity 0.2s ease-out;
}

/* 当前项仅隐藏显示、不改变尺寸，避免列表回流与回弹（Pablo Escudero 式） */
.thumb-item.is-current {
  opacity: 0;
  pointer-events: none;
}

.thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center center;
  display: block;
  vertical-align: middle;
}

.thumb-item:hover:not(.is-current) {
  opacity: 0.85;
}

.caption-zone {
  display: flex;
  align-items: center;
  padding-left: var(--space-xl);
  margin-left: var(--space-md);
  margin-right: var(--space-md);
}

.caption-text {
  font-weight: 300;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1.5;
  margin: 0;
  max-width: 14em;
}
.caption-line1 {
  display: block;
  font-size: 1.2rem;
}
.caption-line2 {
  display: block;
  font-size: 0.9rem;
}
.caption-line2:empty {
  display: none;
}

.main-image-zone {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  min-height: 60vh;
  margin-left: var(--space-sm);
}
.main-image-zone:has(.main-image-wrap.is-landscape) {
  justify-content: flex-end;
  align-items: center;
  /* 宽度含右侧 padding，使横图右缘贴到视口，不被裁切 */
  width: calc(100% + var(--space-xl));
  max-width: 100vw;
  margin-left: 0;
  margin-right: 0;
  padding-right: 0;
  overflow: visible;
  min-width: 0;
  min-height: 76vh;
  box-sizing: border-box;
}

.main-image-wrap {
  position: relative;
  max-width: 85%;
  width: 100%;
  overflow: visible;
  /* 与 body 一致，img 未绘出像素前若露底则不易形成高对比「闪白」 */
  background-color: #fff;
}

/* 首帧原图未就绪时只藏底图，叠层仍可显示解码后的原图，避免全透明闪白 */
.main-image-wrap.is-main-pending #mainImage {
  opacity: 0 !important;
}

/* 竖图：最大高度限制，与文字区域有间距；图片完整显示不裁剪 */
.main-image {
  width: 100%;
  height: auto;
  max-height: 93.5vh;
  object-fit: contain;
  object-position: center center;
  display: block;
  /* Chrome：独立层，减少与叠层切换时的合成白帧 */
  transform: translateZ(0);
}

/* 与底图同布局框叠放，先在此显示原图再同步到底图，避免换 src 白闪 */
.main-image-overlay {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  max-height: none;
  display: block;
  object-fit: contain;
  object-position: center center;
  z-index: 2;
  opacity: 0;
  pointer-events: none;
  backface-visibility: hidden;
  transform: translateZ(0);
}

/* 切换动画期间隐藏主图区（仅用 opacity，勿用 visibility:hidden，否则解码层不合成，解除瞬间易闪白） */
.main-image-wrap[data-transitioning="1"] .main-image,
.main-image-wrap[data-transitioning="1"] .main-image-overlay {
  opacity: 0 !important;
  pointer-events: none;
}

/* 横图：用视口宽度放大显示，右缘贴边不裁切 */
.main-image-wrap.is-landscape {
  max-width: min(92vw, 100%);
  width: max-content;
  margin-left: 0;
  margin-right: 0;
  overflow: visible;
}
.main-image-wrap.is-landscape .main-image {
  max-height: 89.76vh;
  max-width: min(92vw, 100%);
  width: auto;
  height: auto;
  object-fit: contain;
  object-position: right center;
  display: block;
}

.main-image-wrap.is-landscape .main-image-overlay {
  object-position: right center;
}

/* ===== 过渡动画层（GPU 加速，减少卡顿） ===== */
.transition-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  transform: translateZ(0);
}

.transition-layer .clone {
  position: fixed;
  will-change: transform;
  backface-visibility: hidden;
  transform: translateZ(0);
  transform-origin: 0 0;
  contain: layout style paint;
  transition-timing-function: linear;
}

.transition-layer .clone img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  /* 具体对齐由 JS 与主图 .main-image 一致（横图桌面为 right center） */
  object-position: center center;
  display: block;
  pointer-events: none;
}

/* ===== 联系页 ===== */
.contact-page {
  max-width: 480px;
  margin: 0 auto;
  padding: var(--space-xl);
}

.contact-content {
  padding: var(--space-xl) 0;
}

.contact-content h1 {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 var(--space-lg);
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-list li {
  margin-bottom: var(--space-md);
}

.contact-list .contact-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.contact-list a {
  font-size: 0.9375rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--text);
}

.contact-list a:hover {
  color: var(--text-muted);
}

/* ===== 响应式：平板与移动端 ===== */
@media (max-width: 900px) {
  html:has(body.works-body) {
    overflow: hidden;
    height: 100%;
    width: 100%;
  }

  body.works-body {
    overflow: hidden !important;
    touch-action: none;
    -webkit-overflow-scrolling: auto;
  }

  /* 移动端：左列缩略图列表，右列上名称、下大图 */
  .works-page {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
    grid-template-areas:
      "thumb caption"
      "thumb main";
    /* 列间距：缩略图与右栏；行间距：标题与大图（尽量贴紧） */
    row-gap: 2px;
    column-gap: var(--space-md);
    /* 主内容区顶距：×2（相对原 space-xs），标题整体下移、离导航更远 */
    padding: calc(var(--space-xs) * 2) var(--space-md) max(4px, env(safe-area-inset-bottom, 0px));
    align-items: stretch;
    align-content: stretch;
    min-height: 0;
    max-width: 100vw;
    box-sizing: border-box;
    touch-action: none;
    overflow: hidden;
  }

  .thumb-rail {
    grid-area: thumb;
    position: relative;
    width: auto;
    min-height: 0;
    max-height: calc(100dvh - var(--header-offset) - 8px);
    align-self: stretch;
  }

  .thumb-list {
    max-height: calc(100dvh - var(--header-offset) - 8px);
  }

  .thumb-item {
    max-height: none;
  }

  .caption-zone {
    grid-area: caption;
    padding-left: var(--space-md);
    margin-left: 0;
    margin-right: 0;
    justify-content: flex-start;
    align-items: flex-start;
    align-self: start;
    min-width: 0;
    padding-bottom: 0;
    /* 标题相对导航：原 space-sm 的 2 倍，确保明显下移 */
    padding-top: calc(var(--space-sm) * 2);
  }

  .caption-line1 {
    font-size: 0.9rem;
    text-align: left;
  }
  .caption-line2 {
    font-size: 0.675rem;
    text-align: left;
  }

  .main-image-zone {
    grid-area: main;
    min-height: 0;
    align-items: center;
    justify-content: center;
    margin-left: 0;
    margin-top: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
    width: 100%;
    max-width: 100%;
  }

  .main-image-wrap {
    max-width: 100%;
  }

  /* 移动端横图不拉满整屏宽，限制在右栏内 */
  .main-image-zone:has(.main-image-wrap.is-landscape) {
    width: 100%;
    max-width: 100%;
    min-height: 0;
    justify-content: center;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  .main-image-wrap.is-landscape {
    max-width: 100%;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .main-image,
  .main-image-overlay {
    max-height: min(58vh, calc(100dvh - var(--header-offset) - 5.5rem));
  }

  .main-image-wrap.is-landscape .main-image,
  .main-image-wrap.is-landscape .main-image-overlay {
    max-height: min(54vh, calc(100dvh - var(--header-offset) - 5.5rem));
    max-width: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    object-position: center center;
  }
}

@media (max-width: 600px) {
  html {
    font-size: 15px;
  }

  body.works-body .site-header {
    padding-left: max(var(--space-md), env(safe-area-inset-left, 0px));
    padding-right: max(var(--space-md), env(safe-area-inset-right, 0px));
  }

  .works-page {
    padding: calc(var(--space-xs) * 2) var(--space-sm) max(2px, env(safe-area-inset-bottom, 0px));
    row-gap: 2px;
    column-gap: var(--space-sm);
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
    grid-template-areas:
      "thumb caption"
      "thumb main";
  }

  :root {
    --thumb-size: 56px;
  }

  .caption-line1 {
    font-size: 0.8rem;
  }
  .caption-line2 {
    font-size: 0.6rem;
  }

  .main-image,
  .main-image-overlay {
    max-height: min(48vh, calc(100dvh - var(--header-offset) - 24vh));
  }

  .main-image-wrap.is-landscape .main-image,
  .main-image-wrap.is-landscape .main-image-overlay {
    max-height: min(44vh, calc(100dvh - var(--header-offset) - 24vh));
    max-width: 100%;
    object-position: center center;
  }
}