/* =============================================================================
 *  Lyra · screen "books" (单词本 / 语法本 · 你的星图词库) · SCOPED STYLES · FE-10
 *  全部规则挂 [data-screen="books"]。配方照 v5/screen-bookcard.html：
 *    gold-hairline 头 + serif 标题 + thin-underline segmented + 4 阶段 blackbody 计数头
 *    + 通透字典列表行（缩略图 + 词 + 振假名 + 词性/JLPT 徽 + displayStage 态色点）。
 *  色只引令牌（--s-*/--ink*/--hairline*/--accent/--surface*…），**禁写死颜色**；
 *  stage 点的态色一律走内联 var(--s-*)（JS 设），CSS 只管发光/几何。
 * ========================================================================== */

/* —— 根 + 滚动体 —— */
[data-screen="books"] .bk-root {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}
[data-screen="books"] .bk-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}
[data-screen="books"] .bk-scroll::-webkit-scrollbar { display: none; }

[data-screen="books"] .bk-jp { font-family: var(--jp); }

/* ============================================================
   HEADER — gold hairline rule + atlas eyebrow + serif title
   ============================================================ */
[data-screen="books"] .bk-head {
  padding: 18px 22px 18px;
  position: relative;
}
[data-screen="books"] .bk-head::after {
  content: "";
  position: absolute;
  left: 22px; right: 22px; bottom: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--hairline-strong) 18%, var(--hairline-strong) 82%, transparent);
}
[data-screen="books"] .bk-eyebrow {
  font-family: var(--display);
  font-style: italic;
  font-size: 14px;
  letter-spacing: .14em;
  color: var(--ink-subtle);
  margin-bottom: 8px;
}
[data-screen="books"] .bk-eyebrow .bk-jp { font-style: normal; font-family: var(--jp); }
[data-screen="books"] .bk-h1 {
  font-family: var(--display);
  font-size: 38px;
  font-weight: 600;
  line-height: 1.0;
  letter-spacing: -.5px;
  color: var(--ink);
}
[data-screen="books"] .bk-h1 .bk-jp {
  font-family: var(--jp);
  font-weight: 500;
  font-size: .76em;
  letter-spacing: .03em;
}
/* 顶部「接单曲星座」迷你座（DESIGN §5.4） */
[data-screen="books"] .bk-const {
  position: absolute;
  top: 14px; right: 22px;
  width: 44px; height: 44px;
  opacity: .9;
  pointer-events: none;
}
[data-screen="books"] .bk-const .mc { display: block; }
[data-screen="books"] .bk-const .mc-links line { stroke: var(--fig-line); stroke-width: .7; }

/* ============================================================
   SEGMENTED CONTROL — thin underline (单词本 / 语法本)
   ============================================================ */
[data-screen="books"] .bk-seg {
  display: flex;
  gap: 26px;
  margin: 18px 22px 0;
  border-bottom: 1px solid var(--hairline);
}
[data-screen="books"] .bk-seg-btn {
  border: 0;
  background: transparent;
  cursor: pointer;
  font-family: var(--ui);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-subtle);
  padding: 0 0 11px;
  position: relative;
  letter-spacing: .02em;
}
[data-screen="books"] .bk-seg-btn.on { color: var(--ink); }
[data-screen="books"] .bk-seg-btn.on::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px; height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* ============================================================
   STAGE COUNT ROW — 4-stage blackbody ladder (点切过滤)
   ============================================================ */
[data-screen="books"] .bk-stages-wrap { padding: 0 8px; }
[data-screen="books"] .bk-stages {
  display: flex;
  padding: 20px 14px 16px;
}
[data-screen="books"] .bk-stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 7px;
  position: relative;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 6px 4px;
  border-radius: 10px;
  text-align: left;
  transition: background .18s ease;
}
[data-screen="books"] .bk-stage + .bk-stage::before {
  content: "";
  position: absolute;
  left: 0; top: 8px; bottom: 8px; width: 1px;
  background: var(--hairline);
}
[data-screen="books"] .bk-stage:hover { background: color-mix(in srgb, var(--surface) 70%, transparent); }
[data-screen="books"] .bk-stage.is-on {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  box-shadow: inset 0 0 0 1px var(--hairline-strong);
}
[data-screen="books"] .bk-stage-lbl { display: flex; align-items: center; gap: 7px; }
[data-screen="books"] .bk-stage-name { font-size: 11px; color: var(--ink-subtle); letter-spacing: .02em; }
[data-screen="books"] .bk-stage.is-on .bk-stage-name { color: var(--ink-muted); }
[data-screen="books"] .bk-stage-num {
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -.5px;
  line-height: 1;
}

/* blackbody 计数点（色由内联 var(--s-*) 设；CSS 只管几何/发光态） */
[data-screen="books"] .bk-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
[data-screen="books"] .bk-dot.learn  { box-shadow: 0 0 5px -1px var(--s-learn); }
[data-screen="books"] .bk-dot.done   { box-shadow: 0 0 5px 0 var(--s-done); }
/* 待复习=review=暖白：发光柔和（浅色去发光，由刻印调表达） */
[data-screen="books"] .bk-dot.review { box-shadow: 0 0 4px 0 color-mix(in srgb, var(--s-review) 60%, transparent); }
html[data-theme="light"] [data-screen="books"] .bk-dot.review { box-shadow: none; }

[data-screen="books"] .bk-divider {
  height: 1px;
  background: var(--hairline);
  margin: 0 22px;
}

/* ============================================================
   WORD / GRAMMAR ROWS — airy dictionary list
   ============================================================ */
[data-screen="books"] .bk-list { padding: 6px 8px 28px; }
[data-screen="books"] .bk-rows { display: flex; flex-direction: column; }
[data-screen="books"] .bk-row {
  display: flex;
  align-items: center;
  gap: 15px;
  width: 100%;
  padding: 13px 12px;
  border: 0;
  background: transparent;
  border-radius: 12px;
  cursor: pointer;
  min-height: 68px;
  text-align: left;
  transition: background .15s ease;
}
[data-screen="books"] .bk-row:hover,
[data-screen="books"] .bk-row:focus-visible {
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--hairline);
  outline: none;
}

[data-screen="books"] .bk-thumb {
  width: 48px; height: 48px;
  border-radius: 8px;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px var(--hairline);
  position: relative;
  overflow: hidden;
}
[data-screen="books"] .bk-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 22%, color-mix(in srgb, var(--ink) 14%, transparent), transparent 58%);
}
html[data-theme="light"] [data-screen="books"] .bk-thumb { filter: saturate(.88) brightness(.99); }
[data-screen="books"] .bk-thumb-grammar {
  display: flex;
  align-items: center;
  justify-content: center;
  color: color-mix(in srgb, var(--ink) 78%, transparent);
}
[data-screen="books"] .bk-thumb-grammar svg { position: relative; z-index: 1; }

[data-screen="books"] .bk-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
[data-screen="books"] .bk-top { display: flex; align-items: baseline; gap: 9px; }
[data-screen="books"] .bk-word {
  font-size: 19px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -.01em;
  line-height: 1.15;
}
[data-screen="books"] .bk-read {
  font-size: 13px;
  color: var(--ink-muted);
  letter-spacing: .01em;
}
[data-screen="books"] .bk-sub {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  color: var(--ink-subtle);
  line-height: 1.3;
  min-width: 0;
}
[data-screen="books"] .bk-gloss {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
[data-screen="books"] .bk-from {
  white-space: nowrap;
  color: var(--ink-subtle);
  font-size: 12px;
}

/* tiny category chips (名/动/JLPT) */
[data-screen="books"] .bk-chip {
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .04em;
  padding: 1.5px 6px;
  border-radius: 6px;
  color: var(--ink-muted);
  box-shadow: inset 0 0 0 1px var(--hairline);
}
[data-screen="books"] .bk-chip.jlpt {
  color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--hairline-strong);
}

/* stage 点（按 displayStage；色由内联 var(--s-*) 设，CSS 只管几何/发光） */
[data-screen="books"] .bk-star {
  flex-shrink: 0;
  width: 9px; height: 9px;
  border-radius: 50%;
}
[data-screen="books"] .bk-star.learn  { box-shadow: 0 0 6px -1px var(--s-learn); }
[data-screen="books"] .bk-star.done   { box-shadow: 0 0 7px 0 var(--s-done); }
[data-screen="books"] .bk-star.review { box-shadow: 0 0 4px 0 color-mix(in srgb, var(--s-review) 55%, transparent); }
html[data-theme="light"] [data-screen="books"] .bk-star.review { box-shadow: none; }

/* twinkle = 仅透明度（DESIGN §4；done/review 柔微闪，绝不移位） */
@keyframes bk-tw { 0%, 100% { opacity: 1; } 50% { opacity: .7; } }
[data-screen="books"] .bk-star.done,
[data-screen="books"] .bk-star.review { animation: bk-tw 4.8s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
  [data-screen="books"] .bk-star.done,
  [data-screen="books"] .bk-star.review { animation: none; }
}

/* ============================================================
   SKELETON + EMPTY
   ============================================================ */
[data-screen="books"] .bk-rows.is-loading { padding-top: 6px; }
[data-screen="books"] .bk-skel {
  height: 68px;
  margin: 0 12px;
  border-radius: 12px;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--surface) 80%, transparent) 25%,
    var(--surface) 50%,
    color-mix(in srgb, var(--surface) 80%, transparent) 75%);
  background-size: 200% 100%;
  animation: bk-shimmer 1.4s ease-in-out infinite;
  margin-bottom: 4px;
}
@keyframes bk-shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
@media (prefers-reduced-motion: reduce) { [data-screen="books"] .bk-skel { animation: none; } }

[data-screen="books"] .bk-empty {
  padding: 48px 30px;
  text-align: center;
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.6;
}

/* P9：语法本「本曲语法点」可加建议(focus 面板按 v5 移除后的语法发现入口) */
[data-screen="books"] .bk-gram-suggest {
  margin: 18px 22px calc(20px + env(safe-area-inset-bottom));
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
[data-screen="books"] .bk-gram-suggest-h {
  font-family: var(--ui);
  font-size: 12.5px; color: var(--ink-faint);
  margin-bottom: 10px; letter-spacing: .02em;
}
[data-screen="books"] .bk-gram-suggest-chips {
  display: flex; flex-wrap: wrap; gap: 8px;
}
[data-screen="books"] .bk-gram-chip {
  display: inline-flex; align-items: baseline; gap: 8px;
  padding: 8px 12px; border-radius: 12px;
  background: var(--fill-soft); border: 1px solid var(--line);
  cursor: pointer; text-align: left;
  transition: border-color .16s ease, background .16s ease, opacity .16s ease, transform .12s ease;
}
[data-screen="books"] .bk-gram-chip:hover { border-color: var(--accent); background: var(--fill-hover); }
[data-screen="books"] .bk-gram-chip:active { transform: scale(.97); }
[data-screen="books"] .bk-gram-chip.added { opacity: .5; pointer-events: none; }
[data-screen="books"] .bk-gram-chip-p {
  font-family: var(--jp); font-size: 14px; font-weight: 500; color: var(--ink);
}
[data-screen="books"] .bk-gram-chip-g {
  font-size: 11.5px; color: var(--ink-dim);
}
[data-screen="books"] .bk-gram-chip-add {
  color: var(--accent); font-size: 14px; font-weight: 600; margin-left: 2px;
}