.page-faq {
  --faq-rail: clamp(46px, 6vw, 88px);
  --faq-step-line: rgba(7, 26, 43, 0.14);
  --faq-hair: rgba(7, 26, 43, 0.1);
}

/* ---------- 共用排版 ---------- */
.page-faq .faq-h2 {
  font-family: var(--fh-font-display);
  font-weight: 400;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--fh-ink);
  margin: 0;
}

.page-faq .fh-prose {
  font-size: 17px;
  line-height: 1.85;
  color: var(--fh-ink-soft);
  margin: 0 0 18px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 6vw, 76px) clamp(44px, 7vw, 88px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(201, 214, 220, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 214, 220, 0.07) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(circle at 78% 26%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 78% 26%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .faq-hero__eyebrow {
  color: var(--fh-signal);
  margin-bottom: 14px;
}

.page-faq .faq-hero__title {
  font-family: var(--fh-font-display);
  font-weight: 300;
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--fh-paper);
  margin: 0 0 20px;
  max-width: 16em;
}

.page-faq .faq-hero__lead {
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.82);
  max-width: 40em;
  margin: 0 0 28px;
}

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

.page-faq .faq-hero__aside {
  background: rgba(252, 250, 244, 0.06);
  border: 1px solid rgba(201, 214, 220, 0.24);
  border-radius: 3px;
  padding: 22px clamp(18px, 3vw, 28px) 24px;
  align-self: start;
  backdrop-filter: blur(6px);
}

.page-faq .faq-hero__aside-title {
  font-family: var(--fh-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fh-moss);
  margin: 0 0 14px;
}

.page-faq .faq-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-toc a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid rgba(201, 214, 220, 0.12);
  color: var(--fh-paper);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: color 0.18s ease;
}

.page-faq .faq-toc li:last-child a {
  border-bottom: 0;
}

.page-faq .faq-toc__num {
  font-family: var(--fh-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fh-signal);
  flex: none;
}

.page-faq .faq-toc a:hover,
.page-faq .faq-toc a:focus-visible {
  color: var(--fh-signal);
}

.page-faq .faq-toc a:hover .faq-toc__num,
.page-faq .faq-toc a:focus-visible .faq-toc__num {
  color: var(--fh-paper);
}

/* ---------- 开始前 ---------- */
.page-faq .faq-before {
  background: var(--fh-paper);
  padding-block: clamp(44px, 6vw, 76px);
}

.page-faq .faq-before__grid {
  gap: clamp(24px, 4vw, 48px);
}

.page-faq .faq-entries {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--faq-hair);
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-entry {
  background: var(--fh-paper);
  display: grid;
  gap: 6px;
  padding: 16px 0;
}

.page-faq .faq-entry__key {
  font-family: var(--fh-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fh-signal-deep);
}

.page-faq .faq-entry__val {
  font-size: 15px;
  line-height: 1.7;
  color: var(--fh-ink-soft);
}

/* ---------- 步骤 ---------- */
.page-faq .faq-steps {
  background: var(--fh-card);
  padding-block: clamp(44px, 6vw, 82px);
}

.page-faq .faq-steps__eyebrow {
  margin-bottom: 10px;
}

.page-faq .faq-steps__title {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-faq .faq-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: var(--faq-rail) minmax(0, 1fr);
  gap: clamp(14px, 3vw, 36px);
  scroll-margin-top: 96px;
}

.page-faq .faq-step__rail {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-top: 4px;
}

.page-faq .faq-step__rail::before {
  content: "";
  position: absolute;
  top: 62px;
  bottom: -40px;
  left: 50%;
  width: 1px;
  background: var(--faq-step-line);
  transform: translateX(-50%);
}

.page-faq .faq-step:last-child .faq-step__rail::before {
  display: none;
}

.page-faq .faq-step__num {
  font-family: var(--fh-font-mono);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 30px);
  letter-spacing: -0.02em;
  color: var(--fh-ink);
  line-height: 1;
}

.page-faq .faq-step__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fh-mist);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-faq .faq-step:hover .faq-step__dot,
.page-faq .faq-step:focus-within .faq-step__dot {
  background: var(--fh-signal);
  box-shadow: 0 0 0 5px rgba(255, 107, 44, 0.14);
}

.page-faq .faq-step__body {
  min-width: 0;
  padding-bottom: 8px;
}

.page-faq .faq-step__meta {
  font-family: var(--fh-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fh-stone);
  margin: 0 0 8px;
}

.page-faq .faq-step__title {
  font-family: var(--fh-font-display);
  font-weight: 500;
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--fh-ink);
  margin: 0 0 14px;
}

.page-faq .faq-step__linkline {
  margin: 18px 0 0;
}

.page-faq .faq-step__split {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-faq .faq-step__figure {
  margin: 0;
  background: var(--fh-paper);
  border: 1px solid var(--faq-hair);
  border-radius: 3px;
  overflow: hidden;
}

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

.page-faq .faq-step__figure figcaption {
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--fh-stone);
  padding: 10px 14px 12px;
  border-top: 1px solid var(--faq-hair);
}

/* 版本对比 */
.page-faq .faq-compare {
  margin: 22px 0 0;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-compare__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-compare dt {
  font-family: var(--fh-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fh-moss);
}

.page-faq .faq-compare dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fh-ink-soft);
}

/* ---------- 常见问题 ---------- */
.page-faq .faq-questions {
  background: var(--fh-paper);
  padding-block: clamp(44px, 6vw, 82px);
}

.page-faq .faq-questions__grid {
  gap: clamp(24px, 4vw, 48px);
}

.page-faq .faq-questions__intro {
  margin-top: 16px;
  color: var(--fh-stone);
}

.page-faq .faq-group {
  margin-bottom: 26px;
}

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

.page-faq .faq-group__title {
  font-family: var(--fh-font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--fh-clay);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--fh-mist);
}

.page-faq .faq-item {
  border: 1px solid var(--fh-mist);
  border-radius: 3px;
  background: var(--fh-card);
  margin-bottom: 8px;
  overflow: hidden;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-faq .faq-item:hover {
  border-color: var(--fh-signal);
}

.page-faq .faq-item[open] {
  border-color: var(--fh-signal);
  background: #fffdf7;
}

.page-faq .faq-item__q {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  font-size: 16px;
  line-height: 1.55;
  font-weight: 500;
  color: var(--fh-ink);
}

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

.page-faq .faq-item__q::before {
  content: "＋";
  font-family: var(--fh-font-mono);
  font-size: 14px;
  color: var(--fh-signal-deep);
  flex: none;
}

.page-faq .faq-item[open] .faq-item__q::before {
  content: "－";
}

.page-faq .faq-item__a {
  padding: 0 16px 16px 40px;
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fh-ink-soft);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--fh-signal);
  outline-offset: -2px;
}

/* ---------- 反馈 ---------- */
.page-faq .faq-contact {
  padding-block: clamp(44px, 6vw, 82px);
}

.page-faq .faq-contact__grid {
  gap: clamp(28px, 4vw, 52px);
}

.page-faq .faq-contact__eyebrow {
  color: var(--fh-signal);
  margin-bottom: 12px;
}

.page-faq .faq-contact__title {
  color: var(--fh-paper);
  margin-bottom: 18px;
}

.page-faq .faq-contact__text {
  color: rgba(243, 239, 230, 0.82);
  max-width: 38em;
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

.page-faq .faq-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(201, 214, 220, 0.2);
  border-top: 1px solid rgba(201, 214, 220, 0.2);
  border-bottom: 1px solid rgba(201, 214, 220, 0.2);
}

.page-faq .faq-contact__list li {
  background: var(--fh-pitch);
  display: grid;
  gap: 4px;
  padding: 14px 2px;
}

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

.page-faq .faq-contact__value {
  font-size: 15px;
  line-height: 1.65;
  color: var(--fh-paper);
  word-break: break-word;
}

.page-faq .faq-contact__note {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.75;
  color: rgba(201, 214, 220, 0.72);
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 860px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-faq .faq-step__split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .page-faq .faq-step__split--flip {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-faq .faq-step__split--flip .faq-step__copy {
    order: 1;
  }

  .page-faq .faq-step__split--flip .faq-step__figure {
    order: 2;
  }

  .page-faq .faq-compare__row {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-faq .faq-entry {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 24px;
    align-items: baseline;
    padding: 18px 0;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-hero__aside {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-step__split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }
}

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