.page-faq {
  --faq-rule: rgba(11, 18, 48, 0.12);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.6rem, 4vw, 2.6rem) clamp(2.6rem, 7vw, 5rem);
  background: linear-gradient(128deg, var(--indigo-950) 0%, var(--indigo-800) 58%, var(--indigo-600) 100%);
  color: var(--on-dark);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(115deg, transparent 0 63%, rgba(200, 162, 74, 0.1) 63% 63.35%, transparent 63.35%),
    radial-gradient(circle at 88% 8%, rgba(47, 212, 198, 0.16), transparent 48%);
}

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

.page-faq .faq-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0 0 clamp(1.4rem, 3vw, 2.2rem);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--on-dark-muted);
}

.page-faq .faq-crumbs a {
  color: var(--sand-200);
}

.page-faq .faq-crumbs li + li::before {
  content: "\203A";
  margin: 0 0.55rem;
  color: var(--slate-400);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3rem);
}

.page-faq .faq-hero__eyebrow {
  margin: 0 0 0.55rem;
  color: var(--sand-500);
}

.page-faq .faq-hero__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 8vw, 4.1rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: #fff;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: clamp(1rem, 2vw, 1.08rem);
  line-height: 1.92;
  color: var(--on-dark);
}

.page-faq .faq-facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-faq .faq-facts__row {
  padding: 1rem 1.05rem;
  background: rgba(243, 241, 234, 0.05);
}

.page-faq .faq-facts dt {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--on-dark-muted);
}

.page-faq .faq-facts dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--sand-200);
}

/* ---------- 索引目录章节 ---------- */
.page-faq .faq-index-sec {
  padding-block: clamp(2.4rem, 6vw, 4.4rem);
  background: var(--paper-100);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .faq-index-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3rem);
}

.page-faq .faq-index-sec__eyebrow {
  margin: 0 0 0.5rem;
  color: var(--sand-500);
}

.page-faq h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-faq .faq-index-sec__text .lede {
  margin: 0 0 1.5rem;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.7vw, 1.06rem);
  line-height: 1.92;
  color: var(--ink-900);
}

.page-faq .faq-index-sec__text p {
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.92;
  color: var(--ink-900);
}

/* ---------- 编号步骤 ---------- */
.page-faq .steps {
  position: relative;
  margin: 0 0 1.3rem;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
}

.page-faq .steps::before {
  content: "";
  position: absolute;
  left: 0.8rem;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--faq-rule) 0 4px, transparent 4px 9px);
}

.page-faq .steps li {
  position: relative;
  counter-increment: faq-step;
  margin: 0 0 0.85rem;
  padding-left: 2.35rem;
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 1.88;
  color: var(--ink-900);
}

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

.page-faq .steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.16em;
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--paper-050);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.02em;
  color: var(--sand-500);
  font-variant-numeric: tabular-nums;
}

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

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border: 1px solid var(--faq-rule);
  background: var(--paper-050);
}

.page-faq .faq-figure figcaption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--slate-400);
}

.page-faq .faq-figure--tree {
  padding: clamp(0.8rem, 2vw, 1.2rem);
  border: 1px solid var(--faq-rule);
  background: linear-gradient(158deg, rgba(36, 53, 111, 0.07), rgba(47, 212, 198, 0.07));
}

.page-faq .faq-figure--tree img {
  border: 0;
  background: transparent;
}

.page-faq .faq-figure--flow {
  margin-top: clamp(1.4rem, 3vw, 2rem);
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
  border-top: 1px solid var(--faq-rule);
}

/* ---------- 问答区 ---------- */
.page-faq .faq-body {
  padding-block: clamp(2.4rem, 6vw, 4.4rem) clamp(3rem, 8vw, 5.5rem);
  background: var(--paper-100);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-faq .faq-rail__title {
  margin: 0 0 0.85rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--slate-400);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.4rem;
  list-style: none;
  overflow-x: auto;
}

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

.page-faq .index-rail__link {
  display: block;
  padding: 0.55rem 0.75rem;
  border-bottom: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--ink-900);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-2) ease, border-color var(--dur-2) ease, background-color var(--dur-2) ease;
}

.page-faq .index-rail__link:hover,
.page-faq .index-rail__link:focus-visible {
  border-bottom-color: var(--cyan-400);
  background: rgba(47, 212, 198, 0.08);
}

.page-faq .index-rail__link.is-active,
.page-faq .index-rail__link[aria-current] {
  border-bottom-color: var(--sand-500);
  color: var(--indigo-950);
  font-weight: 700;
}

/* 筛选 */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: clamp(1.6rem, 3vw, 2.2rem);
}

.page-faq .filter-chip {
  padding: 0.42rem 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-900);
  cursor: pointer;
  transition: background-color var(--dur-2) ease, border-color var(--dur-2) ease, color var(--dur-2) ease;
}

.page-faq .filter-chip:hover {
  border-color: var(--sand-500);
}

.page-faq .filter-chip.is-active,
.page-faq .filter-chip[aria-pressed="true"] {
  background: var(--indigo-950);
  border-color: var(--indigo-950);
  color: var(--sand-200);
}

/* 分组 */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(2rem, 5vw, 3.2rem);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
  padding-top: 0.9rem;
  border-top: 2px solid var(--indigo-950);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--sand-500);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-group__head h2 {
  margin: 0;
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
}

.page-faq .faq-group__tag {
  margin-left: auto;
  padding: 0.14rem 0.55rem;
  border: 1px solid rgba(31, 138, 112, 0.4);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--jade-500);
}

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

.page-faq .acc__item:first-child {
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-q {
  margin: 0;
}

.page-faq .acc__btn {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  margin: 0;
  padding: 1.05rem 0.2rem 1.05rem 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur-2) ease;
}

.page-faq .acc__btn:hover {
  color: var(--indigo-800);
}

.page-faq .acc__btn:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-faq .faq-q__num {
  flex: 0 0 auto;
  min-width: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--sand-500);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-q__text {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1rem, 2vw, 1.08rem);
  line-height: 1.55;
  color: var(--ink-900);
}

.page-faq .faq-q__ind {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-faq .faq-q__ind::before,
.page-faq .faq-q__ind::after {
  content: "";
  position: absolute;
  background: var(--slate-400);
  transition: transform var(--dur-3) ease, background-color var(--dur-2) ease;
}

.page-faq .faq-q__ind::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-faq .faq-q__ind::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
}

.page-faq .acc__btn[aria-expanded="true"] .faq-q__ind::before {
  background: var(--sand-500);
}

.page-faq .acc__btn[aria-expanded="true"] .faq-q__ind::after {
  transform: translateX(-50%) scaleY(0);
}

.page-faq .acc__btn[aria-expanded="true"] .faq-q__text {
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-faq .acc__panel-inner {
  max-width: 68ch;
  padding: 0 0 1.5rem;
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 1.92;
  color: var(--ink-900);
}

.page-faq .acc__panel-inner p {
  margin: 0 0 0.85rem;
}

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

.page-faq .acc__panel-inner a {
  color: var(--indigo-800);
  font-weight: 500;
}

/* 邮件模板 */
.page-faq .faq-mail {
  border: 1px solid var(--indigo-800);
  background: var(--paper-050);
}

.page-faq .faq-mail__head {
  margin: 0;
  padding: 0.7rem 1rem;
  background: var(--indigo-950);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--sand-200);
}

.page-faq .faq-mail__body {
  padding: clamp(1rem, 3vw, 1.4rem);
}

.page-faq .faq-mail__meta {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--indigo-800);
}

.page-faq .faq-mail__list li {
  background: transparent;
}

.page-faq .faq-mail__addr-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin: 1.3rem 0 1rem;
}

.page-faq .faq-mail__addr {
  padding: 0.28rem 0.6rem;
  background: var(--sand-200);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.01em;
  color: var(--indigo-950);
  word-break: break-all;
}

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

/* ---------- 窄屏 ---------- */
@media (max-width: 640px) {
  .page-faq .faq-facts {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-group__tag {
    margin-left: 0;
  }

  .page-faq .acc__btn {
    gap: 0.7rem;
  }

  .page-faq .steps li {
    padding-left: 2.1rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-faq .faq-index-sec__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

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

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 5.5rem;
  }

  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .index-rail__item + .index-rail__item {
    margin-top: 0.1rem;
  }

  .page-faq .index-rail__link {
    padding: 0.55rem 0.6rem;
    border-bottom: 0;
    border-left: 2px solid transparent;
    white-space: normal;
  }

  .page-faq .index-rail__link:hover,
  .page-faq .index-rail__link:focus-visible {
    border-left-color: var(--cyan-400);
    background: rgba(47, 212, 198, 0.08);
  }

  .page-faq .index-rail__link.is-active,
  .page-faq .index-rail__link[aria-current] {
    border-left-color: var(--sand-500);
    border-bottom-color: transparent;
    background: rgba(200, 162, 74, 0.1);
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .acc__btn,
  .page-faq .faq-q__ind::before,
  .page-faq .faq-q__ind::after,
  .page-faq .index-rail__link,
  .page-faq .filter-chip {
    transition: none;
  }
}