/* ===== Readability 模块样式（贴合主站暗金主题 --cl-* 变量） ===== */
/* hero 下方灰色分隔线（仅作用于可读性页面，复用浅色主题 --cl-border） */
.v-hero { border-bottom: 1px solid var(--cl-border); }
.rd-section { max-width: var(--maxw, 1120px); margin: 0 auto; padding: 4rem 1.25rem 2rem; }
.rd-section__head { margin-bottom: 1.5rem; }
.rd-eyebrow { color: var(--cl-accent); font-size: .82rem; letter-spacing: .14em; text-transform: uppercase; margin: 0 0 .5rem; }
.rd-title { font-size: clamp(1.6rem, 3vw, 2.3rem); margin: 0 0 .6rem; color: var(--cl-text); }
.rd-sub { color: var(--cl-text-dim); max-width: 60ch; line-height: 1.7; margin: 0; }

/* ---------- 单书查询 ---------- */
.rd-search { display: flex; gap: .6rem; flex-wrap: wrap; margin: 1.4rem 0 1rem; }
.rd-search input { flex: 1 1 280px; min-width: 0; padding: .85rem 1rem; border-radius: var(--r, 12px);
  background: var(--cl-muted-bg); border: 1px solid var(--cl-border); color: var(--cl-text); font-size: 1rem; }
.rd-search input:focus { outline: none; border-color: var(--cl-accent); }
.rd-btn { padding: .85rem 1.4rem; border-radius: var(--r, 12px); border: none; cursor: pointer;
  background: var(--cl-accent); color: #fff; font-weight: 700; font-size: 1rem; transition: opacity .15s; }
.rd-btn:hover { opacity: .9; }
.rd-btn--ghost { background: transparent; border: 1px solid var(--cl-border); color: var(--cl-text); }

.rd-status { color: var(--cl-text-dim); min-height: 1.2rem; margin: .4rem 0; font-size: .92rem; }
.rd-status.is-error { color: #ff8a80; }

/* 结果卡 */
.rd-card { background: var(--cl-muted-bg); border: 1px solid var(--cl-border); border-radius: var(--r, 16px);
  padding: 1.4rem; display: grid; grid-template-columns: 120px 1fr; gap: 1.2rem; }
.rd-card__cover { width: 120px; height: 180px; object-fit: cover; border-radius: 8px; background: #000; }
.rd-card__title { font-size: 1.35rem; margin: 0 0 .25rem; color: var(--cl-text); }
.rd-card__author { color: var(--cl-text-dim); margin: 0 0 .8rem; }
.rd-card__desc { color: var(--cl-text); line-height: 1.7; font-size: .95rem; }
.rd-card__desc.is-clamped { display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.rd-link { color: var(--cl-accent); cursor: pointer; font-size: .85rem; display: inline-block; margin-top: .5rem; }

/* 分数网格 */
.rd-scores { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .7rem; margin-top: 1.1rem; }
.rd-score { background: var(--cl-bg-2, #101019); border: 1px solid var(--cl-border); border-radius: 10px; padding: .7rem .85rem; }
.rd-score b { display: block; font-size: 1.4rem; color: var(--cl-accent); }
.rd-score span { font-size: .78rem; color: var(--cl-text-dim); }

.rd-badge { display: inline-flex; align-items: center; gap: .4rem; padding: .3rem .7rem; border-radius: 999px;
  font-size: .8rem; font-weight: 700; border: 1px solid var(--cl-border); color: var(--cl-text); }
.rd-badge b { color: var(--cl-accent); }
.rd-badge--1-4 { border-color: #5ad1c4; } .rd-badge--1-4 b { color: #5ad1c4; }
.rd-badge--5-8 { border-color: #9ad05a; } .rd-badge--5-8 b { color: #9ad05a; }
.rd-badge--9-12 { border-color: #f5c542; } .rd-badge--9-12 b { color: #f5c542; }
.rd-badge--13\+ { border-color: #ff8a80; } .rd-badge--13\+ b { color: #ff8a80; }

.rd-note { color: var(--cl-text-dim); font-size: .82rem; margin-top: 1rem; line-height: 1.6; }

/* ---------- 主题书库 ---------- */
.rd-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.2rem 0 1rem; }
.rd-tab { padding: .55rem 1rem; border-radius: 999px; border: 1px solid var(--cl-border); background: transparent;
  color: var(--cl-text-dim); cursor: pointer; font-size: .9rem; transition: all .15s; }
.rd-tab:hover { color: var(--cl-text); }
.rd-tab.is-active { background: var(--cl-accent); color: #fff; border-color: var(--cl-accent); font-weight: 700; }

.rd-controls { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.rd-controls select { padding: .6rem .8rem; border-radius: 10px; background: var(--cl-muted-bg);
  border: 1px solid var(--cl-border); color: var(--cl-text); font-size: .92rem; }
.rd-controls .rd-count { color: var(--cl-text-dim); font-size: .85rem; margin-left: auto; }

/* ---------- 主题书库：列表（书名 + 作者 + 等级指标） ---------- */
.rd-books { display: block; margin-top: .4rem; }
.rd-row { display: flex; align-items: center; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--cl-border); }
.rd-row:last-child { border-bottom: none; }
.rd-row__main { flex: 1 1 auto; min-width: 0; display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap; }
.rd-row__title { font-size: 1rem; color: var(--cl-text); line-height: 1.3; font-weight: 600; }
.rd-row__author { color: var(--cl-text-dim); font-size: .85rem; }
.rd-row__side { flex: 0 0 auto; display: flex; align-items: center; gap: .7rem; }
.rd-row__metrics { display: flex; gap: .4rem; flex-wrap: wrap; justify-content: flex-end; }

@media (max-width: 560px) {
  .rd-card { grid-template-columns: 1fr; }
  .rd-card__cover { width: 90px; height: 135px; }
  .rd-row { flex-wrap: wrap; gap: .4rem .8rem; }
  .rd-row__side { width: 100%; justify-content: flex-start; gap: .5rem; }
}

/* ---------- 主 / 辅指标 ---------- */
.rd-scores--primary { margin-top: .4rem; }
.rd-scores--secondary { margin-top: .7rem; }
.rd-scores--secondary.is-hidden { display: none; }
.rd-score--primary b { font-size: 1.7rem; color: var(--cl-accent); }
.rd-score--secondary { opacity: .72; }
.rd-score--secondary b { font-size: 1.15rem; color: var(--cl-text-dim); }

/* ---------- 书卡主指标 ---------- */
.rd-book__metrics { display: flex; gap: .45rem; flex-wrap: wrap; margin-top: .7rem; }
.rd-book__metric { font-size: .74rem; color: var(--cl-text-dim); background: var(--cl-bg-2, #101019);
  border: 1px solid var(--cl-border); border-radius: 8px; padding: .22rem .55rem; }
.rd-book__metric b { color: var(--cl-accent); }

/* ---------- 等级筛选标签（点击即筛选） ---------- */
.rd-levelchips { display: flex; flex-wrap: wrap; gap: .45rem; margin: .4rem 0 1rem; }
.rd-chip { padding: .4rem .85rem; border-radius: 999px; border: 1px solid var(--cl-border); background: transparent;
  color: var(--cl-text-dim); cursor: pointer; font-size: .85rem; transition: all .15s; }
.rd-chip:hover { color: var(--cl-text); }
.rd-chip.is-active { background: var(--cl-accent); color: #fff; border-color: var(--cl-accent); font-weight: 700; }

/* 书库计数行 */
.rd-count { color: var(--cl-text-dim); font-size: .85rem; margin: .2rem 0 1rem; }

/* ---------- 分页 ---------- */
.rd-pager { display: flex; justify-content: center; align-items: center; gap: .4rem; margin: 1.6rem 0 .5rem; flex-wrap: wrap; }
.rd-pager__btn { min-width: 38px; padding: .5rem .7rem; border-radius: 10px; border: 1px solid var(--cl-border);
  background: transparent; color: var(--cl-text); cursor: pointer; font-size: .88rem; transition: all .15s; }
.rd-pager__btn:hover:not(:disabled) { border-color: var(--cl-accent); color: var(--cl-accent); }
.rd-pager__btn.is-active { background: var(--cl-accent); color: #fff; border-color: var(--cl-accent); font-weight: 700; }
.rd-pager__btn:disabled { opacity: .4; cursor: not-allowed; }

/* 分类标签中文译名 */
.rd-tab__zh { font-size: .78rem; opacity: .7; margin-left: .25rem; }

/* ---------- 公式说明 ---------- */
.rd-formulas { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; margin-top: 1.4rem; }
.rd-formula { background: var(--cl-muted-bg); border: 1px solid var(--cl-border); border-radius: 12px; padding: 1.1rem 1.2rem; }
.rd-formula__tag { display: inline-block; font-size: .72rem; font-weight: 700; color: var(--cl-accent);
  border: 1px solid var(--cl-accent); border-radius: 999px; padding: .1rem .6rem; margin-bottom: .7rem; letter-spacing: .05em; }
.rd-formula__name { font-size: 1.05rem; color: var(--cl-text); margin: 0 0 .5rem; }
.rd-formula__what { color: var(--cl-text); font-size: .88rem; line-height: 1.6; margin: 0 0 .5rem; }
.rd-formula__what b { color: var(--cl-accent); }
.rd-formula__do { color: var(--cl-text-dim); font-size: .85rem; line-height: 1.6; margin: 0; }
.rd-formula__do b { color: var(--cl-text); }

/* ============================================================
   Readability Test Calculator（实时计算器）
   ============================================================ */
.calc { max-width: var(--maxw, 1120px); margin: 0 auto; padding: 2.5rem 1.25rem; }
.calc__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.6rem; align-items: start; }

/* 左：输入 */
.calc__input { display: flex; flex-direction: column; gap: .6rem; position: sticky; top: 84px; }
.calc__label { font-size: .9rem; color: var(--cl-text-dim); font-weight: 600; }
#calcText {
  width: 100%; min-height: 360px; resize: vertical; padding: 1rem 1.1rem; line-height: 1.7;
  font-size: 1rem; font-family: var(--font-sans, system-ui, sans-serif); color: var(--cl-text);
  background: var(--cl-muted-bg); border: 1px solid var(--cl-border); border-radius: var(--r, 14px);
}
#calcText:focus { outline: none; border-color: var(--cl-accent); }
.calc__wordcount { font-size: .82rem; color: var(--cl-text-dim); }
.calc__wordcount #wcNow { color: var(--cl-text); font-weight: 700; }
.calc__warn { color: #f5c542; margin-left: .4rem; }
.calc__input .rd-btn { align-self: flex-start; }

/* 右：结果 */
.calc__output { background: var(--cl-muted-bg); border: 1px solid var(--cl-border); border-radius: var(--r, 16px); padding: 1.1rem 1.2rem; min-height: 360px; }
.calc__tabs { display: flex; gap: .4rem; margin-bottom: 1rem; border-bottom: 1px solid var(--cl-border); padding-bottom: .7rem; }
.calc__tab { padding: .5rem 1rem; border-radius: 999px; border: 1px solid var(--cl-border); background: transparent;
  color: var(--cl-text-dim); cursor: pointer; font-size: .9rem; transition: all .15s; }
.calc__tab:hover { color: var(--cl-text); }
.calc__tab.is-active { background: var(--cl-accent); color: #fff; border-color: var(--cl-accent); font-weight: 700; }

.calc__emptynote { color: var(--cl-text-dim); font-size: .9rem; line-height: 1.7; padding: 1rem 0; }

.calc-scores { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .7rem; }
.calc-score { background: var(--cl-bg-2, #101019); border: 1px solid var(--cl-border); border-radius: 12px; padding: .8rem .9rem; }
.calc-score__top { display: flex; align-items: baseline; justify-content: space-between; gap: .5rem; }
.calc-score__top b { font-size: 1.6rem; color: var(--cl-accent); line-height: 1; }
.calc-score__tag { font-size: .68rem; font-weight: 700; color: var(--cl-text-dim); border: 1px solid var(--cl-border); border-radius: 6px; padding: .1rem .4rem; }
.calc-score__name { font-size: .8rem; color: var(--cl-text); margin-top: .35rem; line-height: 1.3; }
.calc-score__sub { font-size: .76rem; color: var(--cl-text-dim); margin-top: .35rem; line-height: 1.45; }

.calc-stats { display: flex; flex-direction: column; }
.calc-stat { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding: .6rem 0; border-bottom: 1px solid var(--cl-border); }
.calc-stat:last-child { border-bottom: none; }
.calc-stat__k { font-size: .86rem; color: var(--cl-text-dim); }
.calc-stat__v { font-size: 1.05rem; font-weight: 700; color: var(--cl-text); font-variant-numeric: tabular-nums; }

.is-hidden { display: none !important; }

@media (max-width: 820px) {
  .calc__grid { grid-template-columns: 1fr; }
  .calc__input { position: static; }
  #calcText { min-height: 240px; }
  .calc__output { min-height: 0; }
}

/* 公式 + 年级对应说明 */
.calc-ref { max-width: var(--maxw, 1120px); margin: 1.5rem auto 0; padding: 0 1.25rem 3rem; }
.calc-ref__head { margin-bottom: 1.2rem; }
.calc-ref__head h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); color: var(--cl-text); margin: 0 0 .5rem; }
.calc-ref__head p { color: var(--cl-text-dim); line-height: 1.7; margin: 0; max-width: 64ch; }
.calc-ref__list { display: flex; flex-direction: column; gap: 14px; margin: 1.4rem 0 0; }
.calc-ref__item { border: 1px solid var(--cl-border); border-radius: 14px; background: var(--cl-card); overflow: hidden; }
.calc-ref__top { display: flex; align-items: center; gap: 14px; padding: 14px 18px; background: var(--cl-accent-soft); border-bottom: 1px solid var(--cl-border); }
.calc-ref__no { flex: 0 0 auto; width: 28px; height: 28px; border-radius: 50%; background: var(--cl-accent); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: .82rem; font-weight: 700; }
.calc-ref__name { margin: 0; font-size: 1.02rem; font-weight: 700; color: var(--cl-text); white-space: nowrap; }
.calc-ref__formula { flex: 1 1 auto; font-family: var(--font-mono, ui-monospace, monospace); font-size: .84rem; color: var(--cl-accent); background: #fff; border: 1px solid var(--cl-border); border-radius: 8px; padding: 6px 12px; text-align: center; white-space: nowrap; overflow-x: auto; }
.calc-ref__row { display: grid; grid-template-columns: 1fr 1.5fr 1.5fr; }
.calc-ref__cell { display: flex; flex-direction: column; gap: 5px; padding: 13px 18px; border-right: 1px solid var(--cl-border); }
.calc-ref__cell:last-child { border-right: none; }
.calc-ref__k { font-size: .7rem; letter-spacing: .05em; text-transform: uppercase; color: var(--cl-text-dim); }
.calc-ref__v { font-size: .86rem; color: var(--cl-text); line-height: 1.55; }
@media (max-width: 680px) {
  .calc-ref__top { flex-wrap: wrap; }
  .calc-ref__formula { flex-basis: 100%; text-align: left; }
  .calc-ref__row { grid-template-columns: 1fr; }
  .calc-ref__cell { border-right: none; border-bottom: 1px solid var(--cl-border); }
  .calc-ref__cell:last-child { border-bottom: none; }
}