.page-faq {
  --faq-rail-width: 236px;
  --faq-block-gap: clamp(20px, 3vw, 34px);
  background: var(--ink);
  color: var(--mist);
  overflow-x: clip;
}

.page-faq .container {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 4vw, 52px) 0 clamp(34px, 5.5vw, 76px);
  background:
    radial-gradient(circle at 80% 14%, rgba(255, 107, 44, 0.16), transparent 46%),
    radial-gradient(circle at 10% 88%, rgba(53, 224, 210, 0.13), transparent 52%),
    repeating-radial-gradient(circle at 30% 20%, rgba(233, 238, 247, 0.05) 0 1px, transparent 1px 46px),
    var(--ink);
  border-bottom: 1px solid var(--line-cyan-soft);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-faq .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist-50);
}

.page-faq .crumbs__item {
  color: var(--mist-50);
  text-decoration: none;
}

.page-faq a.crumbs__item:hover,
.page-faq a.crumbs__item:focus-visible {
  color: var(--cyan);
}

.page-faq .crumbs__sep {
  color: var(--gridline);
}

.page-faq .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(29px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-faq .lead {
  margin: 0;
  max-width: 44ch;
  font-size: clamp(15px, 1.35vw, 17px);
  line-height: 1.8;
  color: var(--mist-70);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__figure {
  margin: 0;
  padding: 10px;
  background: linear-gradient(155deg, rgba(53, 224, 210, 0.16), rgba(255, 107, 44, 0.1));
  border: 1px solid var(--line-cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

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

.page-faq .media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--mist-50);
}

/* ---------- 快速索引 ---------- */
.page-faq .faq-index {
  padding: clamp(34px, 5vw, 68px) 0;
  background: linear-gradient(180deg, var(--orbit), rgba(16, 28, 56, 0.5));
  border-bottom: 1px solid var(--line-cyan-soft);
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--mist);
}

.page-faq .faq-index__lead {
  max-width: 62ch;
  color: var(--mist-70);
}

.page-faq .faq-index__lead a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

.page-faq .faq-index__lead a:hover,
.page-faq .faq-index__lead a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-faq .faq-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(22px, 3.4vw, 34px) 0 clamp(20px, 3vw, 28px);
}

.page-faq .faq-map__node {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 13px 13px 15px;
  background: rgba(7, 11, 24, 0.62);
  border: 1px solid var(--line-cyan-soft);
  border-top: 2px solid var(--cyan);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-faq .faq-map__node:hover,
.page-faq .faq-map__node:focus-visible {
  border-top-color: var(--orange);
  background: rgba(53, 224, 210, 0.08);
  transform: translateY(-2px);
}

.page-faq .faq-map__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-faq .faq-map__name {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-faq .faq-map__hint {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--mist-50);
}

/* 筛选按钮 */
.page-faq .filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .filter-btn {
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--line-cyan);
  color: var(--mist-70);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .filter-btn:hover,
.page-faq .filter-btn:focus-visible {
  border-color: var(--orange);
  color: var(--mist);
}

.page-faq .filter-btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-body {
  padding: clamp(34px, 5vw, 76px) 0;
  background: var(--ink);
}

.page-faq .faq-body__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  align-items: start;
}

.page-faq .faq-rail {
  border-top: 2px solid var(--gridline);
  padding-top: 14px;
}

.page-faq .faq-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-rail__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-rail__list > li {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 2px solid var(--line-cyan-soft);
  color: var(--mist-70);
  text-decoration: none;
  font-size: 13.5px;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--mist);
  border-bottom-color: var(--orange);
  background: rgba(53, 224, 210, 0.07);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-faq .faq-rail__note {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist-34);
}

.page-faq .faq-groups {
  min-width: 0;
}

.page-faq .faq-group {
  position: relative;
  margin-bottom: var(--faq-block-gap);
  padding: clamp(16px, 2.4vw, 28px);
  background: linear-gradient(180deg, rgba(16, 28, 56, 0.92), rgba(7, 11, 24, 0.92));
  border: 1px solid var(--line-cyan-soft);
  scroll-margin-top: 96px;
}

.page-faq .faq-group::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 3px;
  background: var(--orange);
}

.page-faq .faq-group.is-hidden {
  display: none;
}

.page-faq .faq-group__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 4px;
  border-bottom: 1px dashed var(--line-cyan);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 25px);
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-faq .faq-group__figure {
  margin: 16px 0 6px;
  max-width: 320px;
  padding: 8px;
  background: rgba(53, 224, 210, 0.06);
  border: 1px solid var(--line-cyan-soft);
}

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

/* 手风琴 */
.page-faq .disclosure {
  border-bottom: 1px solid rgba(233, 238, 247, 0.08);
}

.page-faq .disclosure:last-child {
  border-bottom: 0;
}

.page-faq .disclosure__button {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 16px 0;
  background: none;
  border: 0;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.65;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

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

.page-faq .disclosure__button[aria-expanded="true"] {
  color: var(--cyan);
}

.page-faq .disclosure__icon {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border: 1px solid var(--line-cyan);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-faq .disclosure__icon::before,
.page-faq .disclosure__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: opacity 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq .disclosure__icon::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .disclosure__icon::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .disclosure__button[aria-expanded="true"] .disclosure__icon {
  border-color: var(--orange);
  transform: rotate(180deg);
}

.page-faq .disclosure__button[aria-expanded="true"] .disclosure__icon::before {
  background: var(--orange);
}

.page-faq .disclosure__button[aria-expanded="true"] .disclosure__icon::after {
  opacity: 0;
}

.page-faq .disclosure__panel {
  padding: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-70);
}

.page-faq .disclosure__panel p {
  margin: 0 0 10px;
  max-width: 48ch;
}

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

.page-faq .disclosure__panel a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

.page-faq .disclosure__panel a:hover,
.page-faq .disclosure__panel a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 支持渠道 ---------- */
.page-faq .faq-support {
  padding: clamp(34px, 5vw, 72px) 0;
  background:
    repeating-linear-gradient(0deg, rgba(33, 23, 17, 0.05) 0 1px, transparent 1px 22px),
    var(--cream);
  color: var(--letterpress);
}

.page-faq .faq-support__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

.page-faq .faq-support__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange-ink);
}

.page-faq .faq-support__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--letterpress);
}

.page-faq .faq-support__text {
  margin: 0 0 18px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(33, 23, 17, 0.82);
}

.page-faq .faq-support__list {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-faq .faq-support__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(33, 23, 17, 0.78);
}

.page-faq .faq-support__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--orange-ink);
}

.page-faq .faq-support__card {
  padding: clamp(16px, 2.4vw, 26px);
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(33, 23, 17, 0.24);
  box-shadow: var(--shadow-paper);
}

.page-faq .faq-support__card .copy-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(33, 23, 17, 0.2);
}

.page-faq .faq-support__card .copy-line__label {
  flex: 1 1 72px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange-ink);
}

.page-faq .faq-support__card .copy-line__value {
  flex: 1 1 100%;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  color: var(--letterpress);
  word-break: break-word;
}

.page-faq .faq-support__card .copy-btn {
  flex: 0 0 auto;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid rgba(33, 23, 17, 0.4);
  color: var(--letterpress);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-support__card .copy-btn:hover,
.page-faq .faq-support__card .copy-btn:focus-visible {
  background: var(--letterpress);
  color: var(--cream);
  border-color: var(--letterpress);
}

.page-faq .faq-support__card .copy-note {
  margin: 0;
  min-height: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange-ink);
}

.page-faq .faq-support__meta {
  margin: 16px 0 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-support__meta > div {
  display: grid;
  gap: 4px;
}

.page-faq .faq-support__meta dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange-ink);
}

.page-faq .faq-support__meta dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(33, 23, 17, 0.82);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-faq .faq-support__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-faq .faq-support__card .copy-line {
    flex-wrap: nowrap;
  }

  .page-faq .faq-support__card .copy-line__value {
    flex: 1 1 auto;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body__inner {
    grid-template-columns: var(--faq-rail-width) minmax(0, 1fr);
    gap: clamp(24px, 3.6vw, 46px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-rail__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list > li {
    flex: 1 1 auto;
  }

  .page-faq .faq-rail__link {
    border-bottom: 0;
    border-left: 2px solid var(--line-cyan-soft);
    white-space: normal;
    padding: 10px 12px;
  }

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

@media (min-width: 1080px) {
  .page-faq .faq-map {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-map__node,
  .page-faq .disclosure__icon,
  .page-faq .disclosure__icon::before,
  .page-faq .disclosure__icon::after,
  .page-faq .filter-btn,
  .page-faq .faq-rail__link {
    transition: none;
  }
}