/*
 * 书架首页
 *
 * 主色统一走 wp_head 输出的 :root{--kb-primary:…}（设置页可改），这里不再本地定义，
 * 否则会盖掉用户设的颜色。用到的地方一律 var(--kb-primary, #e03030) 自带兜底。
 */
.mytheme-kb-shelf-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.mytheme-kb-search-wrap {
  position: relative;
  width: 200px;
  max-width: 100%;
}

/* 对齐公益导航栏 ToolboxToolbar：白底细描边胶囊，无灰底，右侧放大镜 */
.mytheme-kb-search-input {
  width: 100%;
  min-height: 36px;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  padding: 0.35rem 2.1rem 0.35rem 0.9rem;
  font-size: 14px; /* text-caption */
  color: #222; /* text-ink */
  background: #fff;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color 0.2s;
}

.mytheme-kb-search-input::-webkit-search-decoration,
.mytheme-kb-search-input::-webkit-search-cancel-button {
  -webkit-appearance: none;
}

.mytheme-kb-search-input::placeholder {
  color: #ccc; /* text-ink-disabled */
}

.mytheme-kb-search-input:focus {
  outline: none;
  border-color: #111;
}

.mytheme-kb-search-icon {
  position: absolute;
  right: 0.65rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  color: #222; /* text-ink，对齐导航栏搜索标 */
  pointer-events: none;
}

.mytheme-kb-search-icon svg {
  width: 16px;
  height: 16px;
}

.mytheme-kb-search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border: 1px solid #eee;
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  z-index: 30;
  max-height: 360px;
  overflow: auto;
  padding: 0.5rem;
}

.mytheme-kb-search-results a {
  display: block;
  padding: 0.65rem 0.75rem;
  border-radius: 12px;
  color: #374151;
  text-decoration: none;
}

.mytheme-kb-search-results a:hover {
  background: #f9fafb;
}

.mytheme-kb-search-results mark {
  background: rgba(240, 48, 48, 0.15);
  color: var(--kb-primary, #e03030);
}

.mytheme-kb-top-strip {
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.mytheme-kb-top-scroll {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.mytheme-kb-shelf-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.mytheme-kb-shelf-tabs a {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid #e5e7eb;
  color: #6b7280;
  text-decoration: none;
  font-size: 13px;
}

.mytheme-kb-shelf-tabs a.is-active {
  border-color: var(--kb-primary, #e03030);
  color: var(--kb-primary, #e03030);
  font-weight: 600;
}

.mytheme-kb-book-grid {
  display: grid;
  /* 一排最多 4 本，超过自动换行 */
  grid-template-columns: repeat(4, 1fr);
  gap: 2.5rem 2rem;
  padding: 0.5rem 0 2rem;
}

@media (max-width: 900px) {
  .mytheme-kb-book-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 600px) {
  .mytheme-kb-book-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/*
 * 简约书架：细浅底线 + 书底接触影暗示搁板。
 * 行高 / 行距仍固定，保证书脚对齐。
 */
.mytheme-kb-bookcase {
  --kb-row-h: 270px; /* 含俯视 tilt，给顶面纸边留高度 */
  --kb-shelf-gap: 48px;
  --kb-cycle: calc(var(--kb-row-h) + var(--kb-shelf-gap));
  grid-auto-rows: var(--kb-row-h);
  row-gap: var(--kb-shelf-gap);
  padding: 0 0 1.5rem;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent var(--kb-row-h),
    #e8e8e8 calc(var(--kb-row-h) + 1px),
    transparent calc(var(--kb-row-h) + 2px),
    transparent var(--kb-cycle)
  );
}

.mytheme-kb-bookcase .wpbd-book {
  align-self: end;
  position: relative;
}

/* 转正 / 聚焦的书要盖住相邻书本，而不是被后面的兄弟节点盖住 */
.mytheme-kb-bookcase .wpbd-book:hover,
.mytheme-kb-bookcase .wpbd-book:focus-within {
  z-index: 5;
}

/* 书底接触影；抬起时变淡 */
.mytheme-kb-bookcase .wpbd-book::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: 70%;
  height: 10px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.18), transparent 72%);
  transition: opacity 0.45s;
  pointer-events: none;
}

.mytheme-kb-bookcase .wpbd-book:hover::after,
.mytheme-kb-bookcase .wpbd-book:focus-within::after {
  opacity: 0.35;
}

.mytheme-kb-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: #9ca3af;
  padding: 3rem 1rem;
}

/*
 * 立体书本：默认侧身（看得见书脊 + 右侧页边），鼠标移入转正。
 * 转轴钉左下角，书身只往后转，脚不陷进搁板线下面。
 */
.wpbd-book {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  /* 略抬视点 = 轻俯视；别抬太高，否则夸张 */
  perspective: 1100px;
  perspective-origin: 50% -8%;
  overflow: visible;
}

.wpbd-book-inner {
  --width: 180px;
  --thick: 34px;
  --radius: 6px;
  /* 侧着摆 + 轻俯视（负 rotateX）；tilt 收小，别过头 */
  --kb-angle: 26deg;
  --kb-tilt: 11deg;
  /* 书页纹：一页一线。过密（1px+1px）在 3D 变换下会糊成灰块 */
  --kb-page-paper: #f7f3ea;
  --kb-page-rule: #c9c0b0;
  --kb-page-step: 5px;
  position: relative;
  display: block;
  width: min(var(--width), 100%);
  aspect-ratio: 17 / 21;
  transform-style: preserve-3d;
  transform-origin: left bottom;
  transform: translateX(12px) rotateX(calc(var(--kb-tilt) * -1)) rotateY(var(--kb-angle));
  transition: transform 0.55s cubic-bezier(0.2, 0.8, 0.25, 1);
  text-decoration: none;
  cursor: pointer;
  overflow: visible;
}

/* 鼠标移入 / 键盘聚焦：转正并轻轻抬起（仍略俯视） */
.wpbd-book:hover .wpbd-book-inner,
.wpbd-book:focus-within .wpbd-book-inner {
  transform: rotateX(-3deg) rotateY(0deg) translateY(-8px);
}

/* 书脊：左侧厚度，借封面色，不放文字 */
.wpbd-spine {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--thick);
  height: 100%;
  transform-origin: left center;
  transform: rotateY(-90deg);
  transform-style: preserve-3d;
  border-radius: 2px 0 0 2px;
  background-color: #d7dade;
  background-image:
    linear-gradient(to right, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.18) 55%, rgba(0, 0, 0, 0.42)),
    var(--kb-spine-img, none);
  background-size: cover, cover;
  background-position: center, left center;
  backface-visibility: hidden;
}

/*
 * 顶面纸边：硬壳略包住纸块。
 * 纹路沿厚度叠（to bottom）——俯视是横向一叠页；竖线会像刨沟而不是书页。
 * 每页 5px（4px 纸面 + 1px 线），才能看出一条一条，而不是密麻灰块。
 */
.wpbd-top {
  position: absolute;
  left: 3px;
  top: 0;
  width: calc(100% - 6px);
  height: calc(var(--thick) - 5px);
  transform-origin: top center;
  transform: rotateX(90deg);
  transform-style: preserve-3d;
  background-color: var(--kb-page-paper);
  background-image:
    /* 前后封面棱（沿厚度两端） */
    linear-gradient(
      to bottom,
      rgba(40, 40, 40, 0.45) 0,
      rgba(40, 40, 40, 0.45) 2px,
      transparent 2px,
      transparent calc(100% - 2px),
      rgba(40, 40, 40, 0.32) calc(100% - 2px),
      rgba(40, 40, 40, 0.32) 100%
    ),
    /* 受光：靠近前封略亮，后封略沉 */
    linear-gradient(
      to bottom,
      rgba(255, 255, 255, 0.28),
      rgba(255, 255, 255, 0) 45%,
      rgba(0, 0, 0, 0.05)
    ),
    repeating-linear-gradient(
      to bottom,
      #fffdf8 0px,
      var(--kb-page-paper) 2px,
      #efe8d8 4px,
      var(--kb-page-rule) 4px,
      var(--kb-page-rule) var(--kb-page-step)
    );
  background-size: auto, auto, 100% var(--kb-page-step);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.05);
  backface-visibility: hidden;
}

/* 右侧书口：纹路沿厚度叠（to right）——侧视是竖向一叠页 */
.wpbd-pages {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 100%;
  width: calc(var(--thick) - 4px);
  transform-origin: left center;
  transform: rotateY(90deg);
  transform-style: preserve-3d;
  border-radius: 0 1px 1px 0;
  background-color: var(--kb-page-paper);
  background-image:
    linear-gradient(to right, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0) 45%),
    repeating-linear-gradient(
      to right,
      #fffdf8 0px,
      var(--kb-page-paper) 2px,
      #efe8d8 4px,
      var(--kb-page-rule) 4px,
      var(--kb-page-rule) var(--kb-page-step)
    );
  background-size: auto, var(--kb-page-step) 100%;
  box-shadow: inset -1px 0 0 rgba(0, 0, 0, 0.06);
  backface-visibility: hidden;
}

/* 封面：书口侧圆角、书脊侧近乎方角 */
.wpbd-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 2px var(--radius) var(--radius) 2px;
  background: #fff;
  transform: translateZ(var(--thick));
  transform-style: preserve-3d;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.2), 0 2px 6px rgba(0, 0, 0, 0.1);
  backface-visibility: hidden;
}

/* 靠书脊折痕暗部 + 书口亮边 */
.wpbd-face::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(0, 0, 0, 0.3) 0, rgba(0, 0, 0, 0.07) 7px, rgba(0, 0, 0, 0) 16px),
    linear-gradient(to right, rgba(255, 255, 255, 0) calc(100% - 5px), rgba(255, 255, 255, 0.4) 100%);
}

.wpbd-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.wpbd-title {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: 1.35rem 0.75rem 0.75rem;
  /* WHY: 产品指定封面标题 18（介于 text-body 16 与 text-page 24） */
  font-size: 18px;
  line-height: 1.3;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.55) 45%, rgba(0, 0, 0, 0.78));
}

/*
 * 管理员「编辑」：坐在立体书外，不跟书身一起转，避免热区跟着 3D 歪掉。
 * 游客看不到（PHP 不输出），这些规则只影响登录编辑态。
 */
.wpbd-book:has(.mytheme-kb-edit-link) {
  position: relative;
}

.wpbd-book .mytheme-kb-edit-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  height: 24px;
  padding: 0 0.625rem;
  border-radius: 999px;
  background: #f3f4f6;
  color: #666;
  font-size: 13px; /* text-footnote */
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}

.wpbd-book .mytheme-kb-edit-link--card {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 8;
}

.wpbd-book .mytheme-kb-edit-link:hover {
  background: #e5e7eb;
  color: #222;
}

.wpbd-book .mytheme-kb-edit-link:focus-visible {
  outline: 2px solid #111;
  outline-offset: 2px;
}

.wpbd-book .mytheme-kb-edit-link-icon {
  flex-shrink: 0;
}

@media (prefers-reduced-motion: reduce) {
  .wpbd-book-inner,
  .wpbd-book .mytheme-kb-edit-link {
    transition: none;
  }
}

@media (max-width: 767px) {
  .wpbd-book .mytheme-kb-edit-link--card {
    min-height: 44px;
    height: 44px;
    padding: 0 0.85rem;
  }

  .wpbd-book-inner {
    --kb-angle: 22deg;
    --kb-tilt: 9deg;
    --thick: 28px;
    --width: 150px;
  }

  .wpbd-title {
    font-size: 16px; /* text-body */
    padding: 1.1rem 0.65rem 0.65rem;
  }
}