.page-faq {
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-serif);
}

.page-faq .num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper-100);
  padding: clamp(22px, 4vw, 36px) 0 clamp(58px, 9vw, 104px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 42px), 0 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -10%;
  width: 56%;
  height: 128%;
  background: var(--ink-700);
  border-radius: 40px;
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  grid-template-columns: 1fr;
  align-items: start;
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--gold-300);
}

.page-faq .faq-hero__title,
.page-faq .faq-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.6vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper-100);
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 42ch;
  font-size: clamp(0.98rem, 2.2vw, 1.08rem);
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.78);
}

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

.page-faq .faq-hero__note {
  border: 1px dashed rgba(227, 196, 138, 0.48);
  background: rgba(247, 243, 234, 0.05);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.page-faq .faq-hero__note-num {
  margin: 0;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--gold-500);
}

.page-faq .faq-hero__note-label {
  margin: 6px 0 14px;
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  color: rgba(247, 243, 234, 0.68);
}

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

.page-faq .faq-hero__note-item {
  font-size: 0.86rem;
  line-height: 1.6;
  color: rgba(247, 243, 234, 0.82);
  border-top: 1px solid rgba(227, 196, 138, 0.2);
  padding-top: 8px;
}

.page-faq .faq-hero__note-item .num {
  color: var(--gold-300);
  margin-right: 6px;
}

/* ---------- 面包屑区域 ---------- */
.page-faq .breadcrumb {
  margin-top: 18px;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(26px, 5vw, 52px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-rail {
  border-bottom: var(--line);
  padding-bottom: 14px;
}

.page-faq .faq-rail__head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--slate);
}

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

.page-faq .faq-rail__item {
  flex: 0 0 auto;
}

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 13px;
  border: var(--line);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--ink-700);
  text-decoration: none;
  background: var(--white);
  transition: border-color 160ms ease, color 160ms ease;
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold-500);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--gold-500);
  color: var(--ink-900);
}

.page-faq .faq-flow {
  display: grid;
  gap: clamp(44px, 7vw, 78px);
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-faq .faq-sec {
  min-width: 0;
  scroll-margin-top: calc(var(--header-offset) + 16px);
}

.page-faq .faq-sec__head {
  border-top: 2px solid var(--ink-900);
  padding-top: 18px;
}

.page-faq .faq-sec__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--gold-500);
}

.page-faq .faq-sec__eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold-500);
}

.page-faq .faq-sec__title {
  margin: 10px 0 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.42rem, 3.6vw, 2rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  max-width: 24em;
}

.page-faq .faq-sec__lead {
  margin: 0;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink-500);
}

/* ---------- 四步自查 ---------- */
.page-faq .faq-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 28px;
}

.page-faq .faq-step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 14px;
  background: var(--paper-200);
  border: var(--line);
  border-left: 3px solid var(--ink-500);
  border-radius: var(--radius);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-faq .faq-step:has(.faq-step__box:checked) {
  border-left-color: var(--verify);
  background: var(--white);
}

.page-faq .faq-step__num {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold-500);
}

.page-faq .faq-step__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-faq .faq-step__text {
  margin: 0;
  flex: 1 1 auto;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--ink-500);
}

.page-faq .faq-step__check {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--slate);
  cursor: pointer;
}

.page-faq .faq-step__box {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--slate);
  border-radius: 3px;
  background: var(--white);
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.page-faq .faq-step__box:checked {
  background-color: var(--verify);
  border-color: var(--verify);
  box-shadow: inset 0 0 0 3px var(--white);
}

/* ---------- 对照选择 ---------- */
.page-faq .faq-picks {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-faq .faq-pick {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 0;
  border-bottom: var(--line);
}

.page-faq .faq-pick__pair {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--ink-700);
}

.page-faq .faq-pick__arrow {
  color: var(--gold-500);
}

.page-faq .faq-pick__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-faq .faq-pick__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--ink-500);
  max-width: 44em;
}

/* ---------- 编号读法 ---------- */
.page-faq .faq-code {
  margin-top: 26px;
  padding: clamp(18px, 3vw, 26px);
  background: var(--white);
  border: var(--line);
  border-top: 3px solid var(--gold-500);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-faq .faq-code__raw {
  margin: 0 0 6px;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  line-height: 1.2;
  color: var(--ink-900);
  word-break: break-all;
}

.page-faq .faq-code__parts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-code__part {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 12px;
  align-items: baseline;
  padding-top: 12px;
  border-top: 1px dashed rgba(200, 150, 62, 0.42);
}

.page-faq .faq-code__key {
  font-size: 0.92rem;
  color: var(--gold-500);
}

.page-faq .faq-code__mean {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink-500);
}

.page-faq .faq-code .copy-btn {
  margin-top: 20px;
}

.page-faq .faq-code__note {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--ink-700);
  border-left: 2px solid var(--gold-300);
  padding-left: 14px;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-folds {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-faq .faq-fold {
  background: var(--paper-200);
  border: var(--line);
  border-left: 3px solid transparent;
  border-radius: var(--radius);
  transition: background-color 200ms ease, border-color 200ms ease;
}

.page-faq .faq-fold[open] {
  background: var(--white);
  border-left-color: var(--gold-500);
}

.page-faq .faq-fold .fold__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-faq .faq-fold__num {
  flex: 0 0 auto;
  font-size: 0.72rem;
  color: var(--gold-500);
}

.page-faq .faq-fold .fold__body {
  font-size: 0.93rem;
  line-height: 1.9;
  color: var(--ink-500);
}

.page-faq .faq-fold .fold__body p {
  margin: 0;
  max-width: 40em;
}

/* ---------- 联系方式 ---------- */
.page-faq .faq-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-contact__item {
  padding: 16px 18px;
  background: var(--white);
  border: var(--line);
  border-radius: var(--radius);
}

.page-faq .faq-contact__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.page-faq .faq-contact__value {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink-900);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__note {
  margin: 16px 0 0;
  max-width: 44em;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-500);
}

.page-faq .faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
}

/* ---------- 图片位 ---------- */
.page-faq .faq-figure {
  margin: 26px 0 0;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-faq .faq-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-offset) + 16px);
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid rgba(47, 74, 110, 0.28);
  }

  .page-faq .faq-rail__item + .faq-rail__item {
    margin-top: 2px;
  }

  .page-faq .faq-rail__link {
    display: flex;
    gap: 10px;
    padding: 9px 0 9px 16px;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    line-height: 1.5;
    position: relative;
  }

  .page-faq .faq-rail__link::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--slate);
    transform: translateY(-50%);
    transition: background-color 160ms ease, width 160ms ease, height 160ms ease;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    color: var(--gold-500);
  }

  .page-faq .faq-rail__link.is-active {
    color: var(--gold-500);
  }

  .page-faq .faq-rail__link.is-active::before {
    background: var(--gold-500);
    width: 7px;
    height: 7px;
    left: -4px;
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
  }

  .page-faq .faq-step:not(:last-child)::after {
    content: "→";
    position: absolute;
    right: -17px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--gold-500);
  }

  .page-faq .faq-pick {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 4px 24px;
    padding: 22px 0;
  }

  .page-faq .faq-pick__pair {
    grid-column: 1;
    grid-row: 1 / 3;
    align-self: center;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .page-faq .faq-pick__arrow {
    transform: rotate(90deg);
    margin-left: 10px;
  }

  .page-faq .faq-pick__title {
    grid-column: 2;
    grid-row: 1;
  }

  .page-faq .faq-pick__text {
    grid-column: 2;
    grid-row: 2;
  }

  .page-faq .faq-figure--devices {
    max-width: 62%;
    margin-left: auto;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-sec__lead,
  .page-faq .faq-pick__text,
  .page-faq .faq-code__note,
  .page-faq .faq-contact__note {
    font-size: 1.02rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail__link,
  .page-faq .faq-rail__link::before,
  .page-faq .faq-step,
  .page-faq .faq-step__box,
  .page-faq .faq-fold {
    transition: none;
  }
}