/* ============================================================
 * glass.css — 毛玻璃卡片体系 + 卡片悬浮光晕 + #life 文件夹卡片 + 灯箱
 * ------------------------------------------------------------
 * 1) .glass：半透明磨砂卡片（-webkit-backdrop-filter + @supports 降级）
 * 2) .card-hover：悬浮上浮 3px + 主色光晕 + 主色描边
 * 3) .folder-card：文件夹卡片——面板底部是文件夹图标（与标题栏同左基线）；
 *    点击后照片从面板下方以扇形展开（高度 + 旋转 + 位移复合动画）；
 *    每张照片悬停即显示该图层的完整缩略图（不再点击看大图）。
 * 4) .lightbox：原图视图（已取消触发，保留样式无害）
 * 5) 响应式：三段断点收敛扇形半径；6) prefers-reduced-motion 降级为瞬切。
 * ============================================================ */

/* ==================== 1. 毛玻璃基类 ==================== */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-stroke);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  backdrop-filter: blur(18px) saturate(1.4);
  box-shadow: var(--shadow-sm);
}

/* 不支持 backdrop-filter 的环境：降级为不透明 Elev 底色 */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass { background: var(--bg-elev); }
  .site-header.is-scrolled,
  .mobile-menu { background: var(--bg-elev); }
  .hero-tag, .btn-ghost, .social-btn, .mode-toggle { background: var(--bg-elev); }
}

/* ==================== 2. 卡片悬浮：上浮 3px + 主色光晕 ==================== */
.card-hover {
  position: relative;
  transition: transform 0.4s var(--ease), box-shadow 0.4s, border-color 0.4s;
}
.card-hover:hover,
.card-hover:focus-visible {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 16px 40px -12px var(--accent-glow), 0 0 0 1px var(--accent);
}

.book-card { transition: transform 0.35s var(--ease), box-shadow 0.35s, border-color 0.35s; }
.book-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 12px 30px -10px var(--accent-glow);
}

/* ==================== 3. #life 文件夹卡片墙 ==================== */
.life-section { position: relative; overflow: visible; padding-block: 56px; }
.life-section .container { position: relative; }
.life-section .section-head { margin-bottom: 22px; }
.life-eyebrow { margin: 0 0 14px; font-size: 11px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent-ink); }

/* 装饰贴纸已移除（R1） */

/* ---- 卡片墙：两列规整排布 ---- */
.folder-grid {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 30px;
  align-items: start;
}
.folder-grid > .empty-tip { grid-column: 1 / -1; margin: 0; }

.folder-card {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transform-origin: center bottom;
  transition: transform 0.55s var(--ease);
  -webkit-tap-highlight-color: transparent;
}
/* 紧凑排布：取消错落位移，便于一屏完整展示 */
.folder-card:nth-child(odd),
.folder-card:nth-child(even) { transform: none; }
.folder-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 8px; border-radius: 24px; }
.folder-card:hover,
.folder-card:focus-visible,
.folder-card[aria-expanded="true"] { z-index: 6; }

/* 卡片舞台：照片堆在文件夹后面，高度固定保证扇形有地方展开 */
.folder-scene {
  position: relative;
  display: block;
  height: 250px;
  perspective: 900px;
}
@media (prefers-reduced-motion: no-preference) {
  .folder-card:not(:hover):not([aria-expanded="true"]) .folder-scene { animation: folder-float 5.2s ease-in-out infinite; }
  .folder-card:nth-child(2n) .folder-scene { animation-delay: -1.7s; }
  .folder-card:nth-child(3n) .folder-scene { animation-delay: -3.1s; }
}
@keyframes folder-float { 50% { transform: translateY(-7px); } }

/* 背板：深一档的"文件夹"厚度，顶部带一个小凸口 */
.folder-back,
.folder-front {
  position: absolute;
  left: 7%;
  right: 7%;
  bottom: 18px;
  display: block;
  border-radius: 20px;
}
.folder-back {
  z-index: 2;
  height: 184px;
  background: var(--folder-back, #cdd8d1);
  border: 1px solid var(--border);
  box-shadow: 0 22px 40px -22px rgba(24, 40, 34, 0.34);
  transition: transform 0.58s var(--ease);
}
.folder-back::before {
  content: "";
  position: absolute;
  left: 0;
  top: -32px;
  width: 42%;
  height: 54px;
  background: inherit;
  border-radius: 16px 22px 0 0;
}

/* 正面卡：纸感渐变 + 内高光 */
.folder-front {
  z-index: 8;
  height: 190px;
  padding: 28px 24px 18px;
  display: grid;
  align-content: start;
  gap: 6px;
  color: var(--text);
  background: var(--folder-front, linear-gradient(155deg, #ffffff, #e4eee9));
  border: 1px solid rgba(255, 255, 255, 0.82);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.92),
    0 22px 40px -24px rgba(24, 40, 34, 0.34);
  transform-origin: center bottom;
  transition: transform 0.58s var(--ease);
  overflow: hidden;
}
[data-theme="dark"] .folder-front { background: var(--folder-front, linear-gradient(155deg, #1d2422, #151a19)); border-color: rgba(255, 255, 255, 0.08); }
[data-theme="dark"] .folder-back { background: var(--folder-back, #20272a); }

/* 文件夹图标开关：给「展开 / 收拢」一个明确可见、好点的入口
   （整卡点击依旧有效；展开后点它能可靠收起，不必去躲照片） */
.folder-toggle {
  position: absolute;
  right: 46px;
  top: 8px;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--text-dim);
  cursor: pointer;
  pointer-events: auto;
  transition: color 0.2s, background 0.2s, transform 0.3s var(--ease);
}
.folder-toggle svg { width: 22px; height: 22px; display: block; }
.folder-toggle:hover,
.folder-toggle:focus-visible {
  color: var(--accent-ink);
  background: var(--accent-soft);
  outline: none;
}
/* 展开态：图标点亮，与卡片状态一一对应 */
.folder-card[aria-expanded="true"] .folder-toggle {
  color: var(--accent-ink);
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.folder-num {
  position: absolute;
  right: 20px;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--text-dim);
}
.folder-title {
  max-width: 78%;   /* 给右侧放大的图标留位，标题不压到热区 */
  font-size: clamp(17px, 1.55vw, 22px);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.02em;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.folder-sub { font-size: 11px; letter-spacing: .02em; color: var(--text-dim); }
.folder-desc {
  margin-top: 2px;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--text-dim);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 圆形日签 / 便签贴纸样式已移除（R1） */

/* 照片：白边拍立得，平时从文件夹顶部露出一截，悬停/展开时散开成扇形 */
.folder-photo {
  position: absolute;
  z-index: 5;
  left: 50%;
  bottom: 92px;
  width: var(--pw, min(45%, 250px));
  padding: 7px;
  background: #fff;
  border: 1px solid rgba(70, 56, 82, 0.08);
  border-radius: 12px;
  box-shadow: 0 18px 32px -14px rgba(30, 45, 40, 0.32);
  transform-origin: center bottom;
  transition: transform 0.68s var(--ease), opacity 0.38s, width 0.58s var(--ease);
  pointer-events: none;
  /* 静止态坐标由 JS 写入（--rx/--ry/--rrot/--rscale），支持任意张数；
     下面是无 JS 时的兜底值 */
  transform: translate(calc(-50% + var(--rx, 0px)), var(--ry, 12px)) rotate(var(--rrot, 0deg)) scale(var(--rscale, 0.8));
}
.folder-photo img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 7px;
}
[data-theme="dark"] .folder-photo { background: #eef2f0; }

/* 展开态：由触发的 aria-expanded 控制，所有设备一致。
   坐标来自 JS 写入的 --ox/--oy/--orot/--oscale：张数越多，间距与角度自动收敛，
   因此 5 张、8 张都会完整铺开，不再只显示前 4 张。 */
.folder-card[aria-expanded="true"] .folder-photo {
  width: var(--opw, min(45%, 250px));
  transform: translate(calc(-50% + var(--ox, 0px)), var(--oy, -45px)) rotate(var(--orot, 0deg)) scale(var(--oscale, 1));
}
.folder-card[aria-expanded="true"] .folder-back { transform: translateY(-6px) rotateX(4deg); }
.folder-card[aria-expanded="true"] .folder-front { transform: translateY(12px) rotateX(-11deg); }

/* 仅真实鼠标（精确指针）悬停才做临时预览；触摸设备（含判定为 hover:hover 的
   平板/iPad）不启用，否则点击后系统残留的 :hover 会让卡片收不回去。
   .is-collapsed：刚被点掉展开态时先压住悬停预览，否则鼠标还停在卡片上，
   照片仍散开、看起来像"点击没收拢"；移出后再进入即可恢复预览。 */
@media (hover: hover) and (pointer: fine) {
  .folder-card:not(.is-collapsed):is(:hover, :focus-visible) .folder-photo {
    width: var(--opw, min(45%, 250px));
    transform: translate(calc(-50% + var(--ox, 0px)), var(--oy, -45px)) rotate(var(--orot, 0deg)) scale(var(--oscale, 1));
  }
  .folder-card:not(.is-collapsed):is(:hover, :focus-visible) .folder-back { transform: translateY(-6px) rotateX(4deg); }
  .folder-card:not(.is-collapsed):is(:hover, :focus-visible) .folder-front { transform: translateY(12px) rotateX(-11deg); }
}

/* ------------------------------------------------------------
 * 点击置顶：点中的图层移到照片堆最上层并保持，点其它图层切换，
 * 再次点击同一层或收起卡片时还原。
 * ---------------------------------------------------------- */
.folder-card[aria-expanded="true"] .folder-photo {
  pointer-events: auto;
  cursor: pointer;
}
@media (hover: hover) and (pointer: fine) {
  .folder-card:is(:hover, :focus-visible) .folder-photo {
    pointer-events: auto;
    cursor: pointer;
  }
}

.folder-card:is(:hover, :focus-visible, [aria-expanded="true"]) .folder-photo.is-top {
  /* 置顶预览用固定尺寸，不再乘以 --opw：否则照片越多、--opw 越小，
     点开的"窗口"也跟着缩水 */
  width: min(320px, 82%);
  z-index: 30;
  transform: translate(-50%, -64px) rotate(0deg) scale(1);
  transform-origin: 50% 60%;
  box-shadow: 0 26px 48px -16px rgba(30, 45, 40, 0.46);
}

/* 置顶后整图完整展示，不再被 4:3 画框裁切 */
.folder-photo.is-top img { object-fit: contain; }

/* 其余图层后退变淡，强调当前层；不支持 :has 的浏览器自动忽略 */
.folder-card:has(.folder-photo.is-top) .folder-photo:not(.is-top) {
  opacity: 0.55;
  filter: saturate(0.7);
}

/* 减弱动效：保留置顶层级，只去掉大幅放大位移 */
@media (prefers-reduced-motion: reduce) {
  .folder-card:is(:hover, :focus-visible, [aria-expanded="true"]) .folder-photo.is-top {
    width: min(320px, 82%);
    transform: translate(-50%, -56px) rotate(0deg) scale(1);
  }
}

/* ---- 「全部记录」折叠区（方案 G：内容增长承载） ---- */
.life-more-wrap { margin-top: 32px; text-align: center; }
.life-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 auto;
  padding: 12px 24px;
  font: inherit;
  color: var(--text);
  background: var(--folder-front, #fff);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, border-color 0.25s;
}
.life-more-btn:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 12px 26px -12px var(--accent-glow); }
.life-more-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.life-more-arrow { transition: transform 0.3s var(--ease); }
.life-more-btn[aria-expanded="true"] .life-more-arrow { transform: rotate(180deg); }
.life-more-count { color: var(--text-dim); }
.life-more-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 24px;
  text-align: left;
}

/* ==================== 4. 图片全貌视图（灯箱） ==================== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 6px;
  padding: 24px;
  background: rgba(6, 18, 14, 0.8);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  backdrop-filter: blur(18px) saturate(1.2);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s;
}
.lightbox.is-open { opacity: 1; visibility: visible; }

.lightbox-figure { position: relative; display: grid; place-items: center; min-height: 0; }
.lightbox-img {
  /* 用视口单位限制高度：任意长宽比都完整显示、不撑破视口，鼠标点击区也不会溢出图外 */
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: calc(100vh - 132px);
  border-radius: 14px;
  box-shadow: 0 30px 64px -24px rgba(0, 0, 0, 0.7);
  opacity: 0;
  transform: scale(0.96);
  transition: opacity 0.32s ease, transform 0.42s var(--ease);
  cursor: zoom-out;
}
.lightbox-img.is-loaded { opacity: 1; transform: none; }

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  cursor: pointer;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background 0.25s, transform 0.3s var(--ease);
}
.lightbox-close svg,
.lightbox-prev svg,
.lightbox-next svg { width: 19px; height: 19px; }
.lightbox-close { top: 0; right: 0; }
.lightbox-prev { left: 0; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 0; top: 50%; transform: translateY(-50%); }
.lightbox-close:hover { background: rgba(255, 255, 255, 0.26); transform: scale(1.06); }
.lightbox-prev:hover { background: rgba(255, 255, 255, 0.26); transform: translateY(-50%) scale(1.06); }
.lightbox-next:hover { background: rgba(255, 255, 255, 0.26); transform: translateY(-50%) scale(1.06); }
.lightbox-prev[hidden], .lightbox-next[hidden] { display: none; }

.lightbox-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 22px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 13px;
}
.lightbox-caption { font-weight: 600; }
.lightbox-counter { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; opacity: 0.72; }

.lightbox-spinner {
  position: absolute;
  width: 30px;
  height: 30px;
  border: 2px solid rgba(255, 255, 255, 0.24);
  border-top-color: #fff;
  border-radius: 50%;
  opacity: 0;
  animation: lb-spin 0.9s linear infinite;
  transition: opacity 0.2s;
  pointer-events: none;
}
.lightbox-figure.is-loading .lightbox-spinner { opacity: 1; }
@keyframes lb-spin { to { transform: rotate(360deg); } }

/* ==================== 5. 响应式 ==================== */
@media (max-width: 1023px) {
  .folder-grid { gap: 18px; margin-top: 40px; }
  .folder-scene { height: 300px; }
  .folder-front { height: 180px; padding: 26px 20px 18px; }
  .folder-photo { bottom: 90px; }
  .life-more-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 767px) {
  .folder-grid { grid-template-columns: 1fr; gap: 14px; margin-top: 28px; }
  .folder-scene { height: 300px; }
  .folder-back,
  .folder-front { left: 6%; right: 6%; bottom: 14px; }
  .folder-back { height: 186px; }
  .folder-front { height: 192px; padding: 26px 20px 18px; }
  .folder-title { font-size: 19px; max-width: 70%; }
  .folder-toggle { right: 40px; top: 6px; width: 38px; height: 38px; }
  .folder-toggle svg { width: 21px; height: 21px; }
  .folder-num { top: 20px; }
  .folder-photo { bottom: 80px; padding: 6px; }
  .life-more-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .lightbox { padding: 14px; }
  .lightbox-img { max-height: calc(100vh - 112px); border-radius: 12px; }
  .lightbox-close { width: 38px; height: 38px; }
  .lightbox-prev, .lightbox-next { width: 36px; height: 36px; }
  .lightbox-bar { font-size: 12px; padding-bottom: 4px; }
}

/* ==================== 6. 减弱动效：保留状态切换，去掉位移 ==================== */
@media (prefers-reduced-motion: reduce) {
  .folder-photo,
  .folder-front,
  .folder-back,
  .folder-sticker,
  .folder-card,
  .life-sticker-motion,
  .lightbox,
  .lightbox-img {
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
    animation: none !important;
  }
}