/* ===== 问题解答页（.page-faq）===== */
.page-faq {
  --faq-index-w: 208px;
  --faq-rail-h: calc(var(--bar-h) + 26px);
  background: var(--ink-900);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 100px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 40px) 0 clamp(30px, 5vw, 56px);
  background:
    linear-gradient(158deg, var(--ink-900) 0%, var(--ink-850) 48%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 42%;
  right: -12%;
  bottom: -58%;
  height: 300px;
  transform: skewY(-9deg);
  background: linear-gradient(90deg, rgba(34, 224, 214, 0) 0%, rgba(34, 224, 214, 0.13) 55%, rgba(255, 107, 44, 0.09) 100%);
  pointer-events: none;
}

.page-faq .faq-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 34px);
  margin-top: clamp(18px, 3vw, 28px);
  align-items: end;
}

.page-faq .faq-hero h1 {
  margin: 8px 0 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(38px, 8vw, 66px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__h1sub {
  display: block;
  margin-top: 12px;
  font-family: var(--font-body);
  font-size: clamp(15px, 2.3vw, 19px);
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 0;
  color: var(--mist);
  max-width: 28ch;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper-soft);
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding-left: 12px;
  border-left: 2px solid var(--line);
}

.page-faq .faq-hero__facts li:first-child {
  border-left-color: var(--cyan);
}

.page-faq .faq-hero__facts .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
  background: var(--ink-950);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-faq .faq-hero__figure::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(34, 224, 214, 0) 72%);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 40px);
  padding-top: clamp(30px, 5vw, 56px);
}

/* 章节索引 */
.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--paper-soft);
  text-decoration: none;
  font-size: 13.5px;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(34, 224, 214, 0.07);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-index__foot {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* 右侧答案流 */
.page-faq .faq-body {
  min-width: 0;
  display: grid;
  gap: clamp(30px, 4vw, 52px);
}

/* ---------- 章节 ---------- */
.page-faq .faq-chapter {
  position: relative;
  padding-top: clamp(24px, 3.5vw, 38px);
  scroll-margin-top: var(--faq-rail-h);
}

.page-faq .faq-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--line) 0,
    var(--line) 1px,
    transparent 1px,
    transparent 10px
  );
}

.page-faq .faq-chapter::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-chapter__head {
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-faq .faq-chapter__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-faq .faq-chapter__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 3.2vw, 27px);
  line-height: 1.35;
  color: var(--paper);
}

.page-faq .faq-chapter__desc {
  margin: 10px 0 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--paper-soft);
}

/* ---------- 章节总览表 ---------- */
.page-faq .faq-toc {
  list-style: none;
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-toc > li {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 6px 12px;
  padding: 15px 16px;
  background: var(--ink-850);
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-faq .faq-toc__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-faq .faq-toc__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--grass);
}

.page-faq .faq-toc__desc {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 问答折叠 ---------- */
.page-faq .faq-qset {
  display: grid;
}

.page-faq .faq-q {
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-q:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-q__head {
  position: relative;
  display: block;
  padding: 15px 36px 15px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-q__head:hover {
  color: var(--cyan);
}

.page-faq .faq-q__head::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -7px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease);
}

.page-faq .faq-q[open] > .faq-q__head {
  color: var(--cyan);
}

.page-faq .faq-q[open] > .faq-q__head::after {
  transform: rotate(-135deg);
}

.page-faq .faq-q__body {
  padding: 0 0 22px;
  max-width: 44rem;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-soft);
}

.page-faq .faq-q__body p {
  margin: 0;
}

.page-faq .faq-q__body p + p {
  margin-top: 10px;
}

.page-faq .faq-q__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.4);
}

.page-faq .faq-q__body a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 编号步骤 ---------- */
.page-faq .faq-steps {
  counter-reset: faqstep;
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-steps > li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 42px;
  font-size: 14.8px;
  line-height: 1.72;
}

.page-faq .faq-steps > li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 3px;
}

/* ---------- 提示条 ---------- */
.page-faq .faq-note {
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 2px solid var(--orange);
  background: var(--ink-850);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--paper-soft);
}

.page-faq .faq-note a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 44, 0.45);
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-faq .faq-figure figcaption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 排查清单 ---------- */
.page-faq .faq-checks {
  list-style: none;
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-faq .faq-checks > li {
  position: relative;
  padding-left: 22px;
  font-size: 14.6px;
  line-height: 1.75;
  color: var(--paper-soft);
}

.page-faq .faq-checks > li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--grass);
  transform: rotate(45deg);
}

.page-faq .faq-checks strong {
  color: var(--paper);
  font-weight: 600;
}

/* ---------- 结尾行动区 ---------- */
.page-faq .faq-cta {
  position: relative;
  margin-top: clamp(10px, 2vw, 20px);
  padding: clamp(24px, 4vw, 38px);
  background: linear-gradient(122deg, var(--ink-800) 0%, var(--ink-850) 62%, var(--ink-900) 100%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-faq .faq-cta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 64px;
  height: 3px;
  background: var(--orange);
}

.page-faq .faq-cta__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 25px);
  line-height: 1.35;
  color: var(--paper);
}

.page-faq .faq-cta__text {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 14.6px;
  line-height: 1.78;
  color: var(--paper-soft);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 0;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-toc {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: var(--faq-rail-h);
  }

  .page-faq .faq-index__list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    gap: 2px;
    overflow-x: visible;
  }

  .page-faq .faq-index__link {
    display: flex;
    padding: 8px 10px;
    border: 0;
    border-left: 2px solid transparent;
    white-space: normal;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--cyan);
  }

  .page-faq .faq-q__body {
    padding-left: 2px;
  }
}

/* ---------- 大屏 ---------- */
@media (min-width: 1320px) {
  .page-faq .faq-toc {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-q__head,
  .page-faq .faq-q__head::after,
  .page-faq .faq-index__link {
    transition: none;
  }
}