/* =========================================================
   使用指南 /guide/ —— 页面专属样式
   ========================================================= */

.page-faq {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-faq .crumbs {
  padding-top: clamp(14px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(26px, 5vw, 44px);
  border-bottom: 1px solid var(--grid);
  background: linear-gradient(180deg, var(--paper) 0%, var(--blue-light) 100%);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-faq .faq-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(42px, 11vw, 96px);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--steel);
}

.page-faq .faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 分组胶囊索引 */
.page-faq .faq-index {
  margin-top: clamp(4px, 1.4vw, 10px);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-pill {
  display: inline-block;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-pill);
  background: var(--paper);
  color: var(--steel);
  font-size: 13px;
  line-height: 1.2;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.page-faq .faq-pill:hover,
.page-faq .faq-pill:focus-visible {
  border-color: var(--blue);
  background: var(--blue-light);
  color: var(--blue-deep);
}

/* ---------- 通栏配图 ---------- */
.page-faq .faq-banner {
  margin: 0;
}

.page-faq .faq-banner .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 章节通用 ---------- */
.page-faq .faq-chapter {
  padding: clamp(36px, 6vw, 72px) 0;
  border-bottom: 1px solid var(--grid);
}

.page-faq .faq-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-head .chapter-head__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-faq .faq-head .chapter-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 46px);
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-faq .faq-head__meta {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

.page-faq .faq-count {
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--orange);
}

/* ---------- 01 三步开始追看 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-faq .faq-step {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(18px, 3vw, 26px);
  background: var(--paper);
  transition: background-color 0.2s var(--ease);
}

.page-faq .faq-step:hover {
  background: var(--blue-light);
}

.page-faq .faq-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-faq .faq-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 25px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

.page-faq .faq-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

.page-faq .faq-steps__more {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
}

/* ---------- 问答折叠条目 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--grid);
}

.page-faq .faq-q {
  position: relative;
  padding-left: 16px;
  border-bottom: 1px solid var(--grid);
}

.page-faq .faq-q::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--grid);
  transition: width 0.24s var(--ease), background-color 0.24s var(--ease),
    top 0.24s var(--ease), bottom 0.24s var(--ease);
}

.page-faq .faq-q[open]::before {
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--blue);
}

.page-faq .faq-q__ask {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}

.page-faq .faq-q__ask::-webkit-details-marker {
  display: none;
}

.page-faq .faq-q__ask:hover {
  color: var(--blue-deep);
}

.page-faq .faq-q__sign {
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  display: grid;
  place-items: center;
  border: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--blue);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-q__sign::before {
  content: "+";
}

.page-faq .faq-q[open] .faq-q__sign::before {
  content: "\2212";
}

.page-faq .faq-q[open] .faq-q__sign {
  border-color: var(--blue);
  background: var(--blue-light);
}

.page-faq .faq-q__answer {
  max-width: 66ch;
  padding: 0 28px 18px 0;
}

.page-faq .faq-q__answer p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 03 数据与口径（浅电蓝底） ---------- */
.page-faq .faq-chapter--data {
  background: var(--blue-light);
  border-bottom-color: var(--blue-deep);
}

.page-faq .faq-datavis {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-faq .faq-datavis .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 2;
  object-fit: cover;
}

/* ---------- 04 术语小词典 ---------- */
.page-faq .faq-terms {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--grid);
}

.page-faq .faq-term {
  display: grid;
  gap: 8px;
  margin: 0 -12px;
  padding: 18px 12px;
  border-bottom: 1px solid var(--grid);
  transition: background-color 0.2s var(--ease);
}

.page-faq .faq-term__word {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 24px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-term__def {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

.page-faq .faq-term__eg {
  display: inline-block;
  margin: 0 2px;
  padding: 1px 7px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--blue-deep);
  background: var(--blue-light);
  border: 1px solid var(--grid);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.page-faq .faq-term:hover .faq-term__eg {
  color: var(--paper);
  background: var(--orange);
  border-color: var(--orange);
}

/* ---------- 05 长三角专区 ---------- */
.page-faq .faq-chapter--yangtze .chapter-head__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 12px;
  background: var(--green-deep);
}

/* ---------- 06 还没解决 ---------- */
.page-faq .faq-help {
  background: var(--ink);
  border-bottom: 0;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-help .chapter-head__index {
  color: var(--grid);
}

.page-faq .faq-help .chapter-head__title {
  color: var(--paper);
}

.page-faq .faq-help .faq-head__meta {
  color: var(--grid);
}

.page-faq .faq-help__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--paper);
}

.page-faq .faq-contact {
  display: grid;
  gap: 1px;
  margin: 0 0 clamp(24px, 4vw, 36px);
  background: rgba(201, 210, 224, 0.28);
  border: 1px solid rgba(201, 210, 224, 0.28);
}

.page-faq .faq-contact__row {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-faq .faq-contact__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--grid);
}

.page-faq .faq-contact__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .faq-help__block {
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
}

.page-faq .faq-help__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 600;
  line-height: 1.25;
  color: var(--paper);
}

.page-faq .faq-help__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grid);
}

.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-help__back {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
}

.page-faq .faq-help__back .footer-jump {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--grid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-help__back .footer-jump:hover,
.page-faq .faq-help__back .footer-jump:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-faq .faq-help__back .footer-jump__dot {
  width: 8px;
  height: 8px;
  background: var(--orange);
  border-radius: var(--radius-pill);
}

/* =========================================================
   响应式
   ========================================================= */

@media (min-width: 780px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .faq-banner .media__img {
    aspect-ratio: 12 / 5;
  }

  .page-faq .faq-contact__row {
    grid-template-columns: 140px 1fr;
    align-items: baseline;
    gap: 0 16px;
    padding: 16px 20px;
  }

  .page-faq .faq-contact__k {
    letter-spacing: 0.14em;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-term {
    grid-template-columns: 200px 1fr;
    align-items: baseline;
    gap: 0 32px;
    padding: 20px 12px;
  }

  .page-faq .faq-term:hover {
    background: var(--blue-light);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-pill,
  .page-faq .faq-q::before,
  .page-faq .faq-q__sign,
  .page-faq .faq-term,
  .page-faq .faq-term__eg,
  .page-faq .faq-step,
  .page-faq .faq-help__back .footer-jump {
    transition: none;
  }
}