.page-faq {
  --faq-side-w: 170px;
  background: var(--ink-900);
  color: var(--text);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .crumbs {
  padding-top: clamp(20px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-faq .crumbs a {
  color: var(--text-dim);
  text-decoration: none;
}

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

.page-faq .crumbs span {
  margin: 0 6px;
}

/* ---------- 首屏 ---------- */
.faq-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(24px, 4vw, 44px) 0 clamp(28px, 5vw, 56px);
}

.faq-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 7vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.faq-hero__lede {
  max-width: 46ch;
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-dim);
}

.faq-flow-wrap {
  margin: 0;
  align-self: end;
  padding: 18px 18px 12px;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.faq-flow__line {
  stroke: var(--line-strong);
  stroke-width: 1;
  stroke-dasharray: 3 5;
}

.faq-flow__dot {
  fill: var(--ink-900);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.faq-flow__dot--warn {
  fill: var(--red);
  stroke: var(--red);
}

.faq-flow__step {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  fill: var(--stone);
}

.faq-flow__label {
  font-family: var(--font-body);
  font-size: 11px;
  fill: var(--text);
}

.faq-flow__warn {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  fill: var(--red);
}

.faq-flow-wrap figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

/* ---------- 三分支导览 ---------- */
.faq-branch {
  grid-column: 1 / -1;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.faq-branch a {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "no label"
    "no desc";
  gap: 2px 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--text);
}

.faq-branch__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  padding-top: 4px;
}

.faq-branch__label {
  grid-area: label;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 400;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.faq-branch__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

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

/* ---------- 主体两栏 ---------- */
.faq-body {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(8px, 2vw, 16px);
}

.faq-side__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.faq-side__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}

.faq-side__list::-webkit-scrollbar {
  display: none;
}

.faq-side__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--text-dim);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.faq-side__list a::before {
  content: "";
  flex: none;
  width: 12px;
  height: 2px;
  background: var(--line-strong);
  transition: background 0.2s var(--ease), width 0.2s var(--ease);
}

.faq-side__list a:hover,
.faq-side__list a:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
}

.faq-side__list a:hover::before,
.faq-side__list a:focus-visible::before,
.faq-side__list a.is-current::before {
  background: var(--cyan);
  width: 18px;
}

.faq-side__list a.is-current {
  color: var(--paper);
}

.faq-side__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.faq-side__note a {
  color: var(--cyan);
  text-decoration: none;
}

.faq-side__note a:hover {
  text-decoration: underline;
}

/* ---------- 分组 ---------- */
.faq-group {
  padding-top: clamp(32px, 5vw, 60px);
}

.faq-group:first-child {
  padding-top: 0;
}

.faq-group__head {
  max-width: 60ch;
}

.faq-group h2 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(27px, 3.4vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.faq-group__lede {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
}

.faq-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

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

.faq-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

/* ---------- 折叠面板 ---------- */
.faq-list {
  border-bottom: 1px solid var(--line);
}

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

.faq-q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: start;
  gap: 10px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.faq-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.faq-q__no {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.faq-q__text {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.55;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

.faq-q:hover .faq-q__text,
.faq-item[open] .faq-q__text {
  color: var(--cyan);
}

.page-faq .tag {
  display: none;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  line-height: 1.5;
  white-space: nowrap;
}

.page-faq .tag--card-red {
  color: var(--red);
  border: 1px solid rgba(226, 69, 60, 0.5);
  background: rgba(226, 69, 60, 0.14);
}

.page-faq .tag--card-yellow {
  color: var(--yellow);
  border: 1px solid rgba(245, 197, 66, 0.45);
  background: rgba(245, 197, 66, 0.1);
}

.faq-q__mark {
  width: 9px;
  height: 9px;
  margin-top: 8px;
  border-right: 1.5px solid var(--stone);
  border-bottom: 1.5px solid var(--stone);
  transform: rotate(45deg);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.faq-item[open] .faq-q__mark {
  margin-top: 12px;
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.faq-a {
  padding: 0 0 18px;
}

.faq-a p {
  margin: 0;
  padding: 14px 16px;
  border-left: 2px solid var(--cyan);
  background: var(--ink-800);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
  animation: faq-fade 0.22s var(--ease);
}

@keyframes faq-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 收尾求助 ---------- */
.faq-help {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(44px, 6vw, 80px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

.faq-help h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(25px, 3vw, 36px);
  line-height: 1.15;
  color: var(--paper);
}

.faq-help__lede {
  max-width: 52ch;
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.faq-help__mail {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
}

.faq-help__mail:hover {
  text-decoration: underline;
}

.faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.faq-help__list-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.faq-help__list ol {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  counter-reset: faq-help;
  border-top: 1px solid var(--line);
}

.faq-help__list li {
  display: flex;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
  counter-increment: faq-help;
}

.faq-help__list li::before {
  content: counter(faq-help, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
  padding-top: 3px;
}

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

.faq-help__links a {
  color: var(--cyan);
  text-decoration: none;
}

.faq-help__links a:hover {
  text-decoration: underline;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-faq .tag {
    display: inline-block;
  }

  .faq-branch {
    grid-template-columns: repeat(3, 1fr);
    gap: 0 clamp(16px, 2vw, 28px);
  }
}

@media (min-width: 900px) {
  .faq-hero {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .faq-branch {
    grid-column: 1 / -1;
    margin-top: 8px;
  }

  .faq-q__text {
    font-size: 17px;
  }
}

@media (min-width: 1000px) {
  .faq-body {
    grid-template-columns: var(--faq-side-w) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .faq-side {
    align-self: start;
    position: sticky;
    top: calc(var(--top-h) + 32px);
  }

  .faq-side__title {
    display: inline-block;
    writing-mode: vertical-rl;
    letter-spacing: 0.24em;
    margin-bottom: 14px;
  }

  .faq-side__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border: 0;
    border-top: 1px solid var(--line-strong);
  }

  .faq-side__list a {
    width: 100%;
    padding: 12px 0;
    border: 0;
    border-bottom: 1px solid var(--line);
    font-size: 14px;
  }

  .faq-side__list a.is-current {
    color: var(--paper);
  }

  .faq-help {
    grid-template-columns: 1.15fr 1fr;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .faq-a p {
    animation: none;
  }

  .faq-q__mark,
  .faq-branch__label,
  .faq-q__text {
    transition: none;
  }
}