.page-faq {
  --faq-rail: 236px;
  --faq-gap: clamp(1.6rem, 4vw, 3.4rem);
  --faq-answer-line: 3px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.8rem, 5vw, 4.2rem) 0 clamp(2rem, 5vw, 4rem);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(53, 240, 208, .16), transparent 62%),
    radial-gradient(90% 80% at 96% 18%, rgba(255, 106, 43, .13), transparent 66%),
    var(--ink);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(242, 247, 245, .05) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(242, 247, 245, .04) 0 1px, transparent 1px 48px);
}

.page-faq .faq-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.6rem, 5vw, 3.2rem);
}

.page-faq .faq-kicker {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 7.6vw, 5rem);
  line-height: 1;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(.98rem, 2.2vw, 1.08rem);
  line-height: 1.85;
  color: var(--body-text);
}

.page-faq .faq-hero-figure {
  align-self: center;
}

.page-faq .faq-diagram {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  gap: var(--faq-gap);
  padding-top: clamp(2rem, 5vw, 3.8rem);
  padding-bottom: clamp(2.4rem, 6vw, 5rem);
}

/* 问题索引 —— 移动端横向 chip */
.page-faq .faq-index {
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: .7rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-index-title {
  display: none;
}

.page-faq .faq-index-list {
  display: flex;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-faq .faq-index-list a {
  display: inline-flex;
  align-items: center;
  padding: .42rem .8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .8rem;
  line-height: 1.3;
  color: var(--body-text);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-faq .faq-index-list a.is-active {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(53, 240, 208, .1);
}

@media (min-width: 1040px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 96px;
    border-bottom: 0;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-index-title {
    display: block;
    margin: 0 0 .9rem;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .16em;
    color: var(--mute);
  }

  .page-faq .faq-index-list {
    flex-direction: column;
    gap: .1rem;
    white-space: normal;
  }

  .page-faq .faq-index-list a {
    padding: .55rem .7rem;
    border: 0;
    border-left: 2px solid var(--line-soft);
    border-radius: 0;
    font-size: .86rem;
    color: var(--mute);
    white-space: normal;
  }

  .page-faq .faq-index-list a:hover {
    color: var(--white);
  }

  .page-faq .faq-index-list a.is-active {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: rgba(53, 240, 208, .07);
  }
}

/* ---------- 章节 ---------- */
.page-faq .faq-body > .faq-section + .faq-section {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-section {
  padding: 0 0 clamp(1.6rem, 4vw, 2.6rem);
  scroll-margin-top: 96px;
}

.page-faq .faq-body > .faq-section + .faq-section {
  padding-top: clamp(1.6rem, 4vw, 2.6rem);
}

.page-faq .faq-body > .faq-section:last-child {
  padding-bottom: 0;
}

.page-faq .faq-head {
  display: flex;
  align-items: baseline;
  gap: .85rem;
  margin-bottom: .7rem;
}

.page-faq .faq-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-faq .faq-num::after {
  content: "";
  display: inline-block;
  width: 20px;
  height: 2px;
  margin-left: .55rem;
  vertical-align: middle;
  background: var(--cyan);
}

.page-faq .faq-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 4.2vw, 2rem);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-faq .faq-desc {
  margin: 0 0 clamp(1.1rem, 3vw, 1.6rem);
  max-width: 58ch;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.page-faq .faq-item {
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  background: rgba(18, 59, 51, .4);
  transition: background-color .25s ease, border-color .25s ease;
}

.page-faq .faq-item[open] {
  background: var(--ink-2);
  border-color: var(--line);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  padding: .95rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(.98rem, 2.6vw, 1.1rem);
  line-height: 1.5;
  color: var(--white);
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--cyan);
}

.page-faq .faq-item[open] > summary::after {
  content: "–";
  color: var(--orange);
}

.page-faq .faq-item--hot > summary::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: .5em;
  border-radius: 50%;
  background: var(--orange);
}

.page-faq .faq-answer {
  margin: 0 1rem .9rem 1rem;
  padding: .1rem 0 .2rem 1rem;
  border-left: var(--faq-answer-line) solid var(--cyan);
  font-size: .92rem;
  line-height: 1.85;
  color: var(--body-text);
}

.page-faq .faq-item--hot .faq-answer {
  border-left-color: var(--orange);
}

.page-faq .faq-answer p {
  margin: 0 0 .7rem;
}

.page-faq .faq-answer p:last-child {
  margin-bottom: 0;
}

/* ---------- 图文分栏（日历章节） ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(1.2rem, 3vw, 1.8rem);
}

.page-faq .faq-shot {
  margin: 0;
  padding: .5rem .5rem .1rem;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}

.page-faq .faq-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 1px;
}

.page-faq .faq-shot figcaption {
  margin: .6rem .15rem .5rem;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--mute);
}

@media (min-width: 820px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 横幅图（更新章节） ---------- */
.page-faq .faq-band-shot {
  margin: 0 0 clamp(1.1rem, 3vw, 1.6rem);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-faq .faq-band-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(150px, 26vw, 240px);
  object-fit: cover;
}

/* ---------- 联系客服 ---------- */
.page-faq .faq-contact {
  position: relative;
  padding: clamp(1.2rem, 4vw, 1.9rem);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: 2px;
  background:
    linear-gradient(135deg, rgba(18, 59, 51, .92), rgba(11, 42, 37, .92));
}

.page-faq .faq-contact-label {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-faq .faq-contact-mail {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3.4vw, 1.28rem);
  line-height: 1.4;
  color: var(--white);
  word-break: break-all;
}

.page-faq .faq-contact .copy-btn {
  margin-bottom: 1rem;
}

.page-faq .faq-contact-note {
  margin: 0;
  max-width: 52ch;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--mute);
}

.page-faq .faq-tail {
  margin: clamp(1.1rem, 3vw, 1.6rem) 0 0;
  max-width: 62ch;
  font-size: .9rem;
  line-height: 1.9;
  color: var(--body-text);
}

.page-faq .faq-tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, .35);
}

.page-faq .faq-tail a:hover {
  color: var(--white);
  border-bottom-color: var(--orange);
}

@media (max-width: 560px) {
  .page-faq .faq-item > summary {
    padding: .85rem .8rem;
  }

  .page-faq .faq-answer {
    margin: 0 .8rem .85rem .8rem;
    padding-left: .8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-index-list a,
  .page-faq .faq-tail a {
    transition: none;
  }
}