.page-faq {
  --faq-gap: clamp(14px, 2.2vw, 24px);
  --faq-pad: clamp(16px, 2.2vw, 22px);
  --faq-radius: var(--radius-m);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--hair);
  padding: clamp(24px, 4vw, 40px) 0 clamp(32px, 5vw, 56px);
  isolation: isolate;
}

.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: center 40%;
  opacity: 0.16;
  filter: saturate(0.55) contrast(1.15);
  z-index: -2;
}

.page-faq .faq-hero__mesh {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(90deg, rgba(41, 242, 192, 0.07) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(41, 242, 192, 0.05) 0 1px, transparent 1px 72px),
    linear-gradient(180deg, rgba(11, 31, 26, 0.35) 0%, rgba(11, 31, 26, 0.92) 78%);
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
}

.page-faq .faq-hero .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero h1 {
  max-width: 20ch;
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(34px, 6vw, 74px);
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--mint);
}

.page-faq .faq-hero .lead {
  max-width: 62ch;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  color: var(--mute);
  font-size: clamp(15px, 1.6vw, 17px);
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--turf);
  border: 1px solid var(--turf);
  border-radius: var(--faq-radius);
  overflow: hidden;
}

.page-faq .faq-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--stands);
}

.page-faq .faq-stat__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-stat__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mute);
}

/* ---------- 主体骨架：索引 + 问答流 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  padding-block: clamp(30px, 5vw, 56px) clamp(48px, 7vw, 92px);
}

.page-faq .faq-index {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-faq .faq-index__label {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--turf);
  border-radius: 999px;
  background: var(--stands);
  color: var(--mint);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms ease, background-color 180ms ease, color 180ms ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-color: rgba(41, 242, 192, 0.5);
  background: var(--turf);
  color: var(--cyan);
}

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

.page-faq .faq-index__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 12px;
  color: var(--red);
}

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

.page-faq .faq-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(34px, 5vw, 64px);
  min-width: 0;
}

/* ---------- 分组 ---------- */
.page-faq .faq-sec {
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-faq .faq-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  align-items: baseline;
  padding-bottom: 14px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
  border-bottom: 1px solid var(--turf);
}

.page-faq .faq-sec__num {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-sec__head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--mint);
}

.page-faq .faq-sec__intro {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 56ch;
}

/* ---------- 问答卡片 ---------- */
.page-faq .faq-cards {
  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
}

.page-faq .qa {
  border: 1px solid var(--turf);
  border-radius: var(--faq-radius);
  background: var(--stands);
  overflow: hidden;
  transition: border-color 200ms ease;
}

.page-faq .qa:hover {
  border-color: rgba(41, 242, 192, 0.32);
}

.page-faq .qa[open] {
  border-color: rgba(41, 242, 192, 0.46);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: var(--faq-pad);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.45;
  color: var(--mint);
}

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

.page-faq .qa__q::after {
  content: "+";
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .qa[open] .qa__q::after {
  content: "–";
}

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

.page-faq .qa__body {
  padding: 0 var(--faq-pad) var(--faq-pad);
  animation: faq-fade 180ms ease-out both;
}

.page-faq .qa__body p {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mute);
}

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

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 242, 192, 0.45);
}

.page-faq .qa__body a:hover {
  border-bottom-color: var(--cyan);
}

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

/* ---------- 纸面分组：深浅交替 ---------- */
.page-faq .faq-sec--paper .faq-sec__head {
  border-bottom-color: rgba(18, 33, 28, 0.14);
}

.page-faq .faq-sec--paper .faq-sec__head h2 {
  color: var(--ink);
}

.page-faq .faq-sec--paper .faq-sec__intro {
  color: rgba(18, 33, 28, 0.7);
}

.page-faq .faq-sec--paper .qa {
  background: var(--paper);
  border-color: rgba(18, 33, 28, 0.14);
}

.page-faq .faq-sec--paper .qa:hover {
  border-color: rgba(217, 72, 47, 0.4);
}

.page-faq .faq-sec--paper .qa[open] {
  border-color: var(--red);
}

.page-faq .faq-sec--paper .qa__q {
  color: var(--ink);
}

.page-faq .faq-sec--paper .qa__q::after {
  color: var(--red);
}

.page-faq .faq-sec--paper .qa__body p {
  color: rgba(18, 33, 28, 0.78);
}

.page-faq .faq-sec--paper .qa__body a {
  color: #0d5c4a;
  border-bottom-color: rgba(13, 92, 74, 0.45);
}

/* ---------- 插图 ---------- */
.page-faq .faq-figure {
  margin: clamp(24px, 3.4vw, 38px) 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--faq-radius);
  border: 1px solid var(--turf);
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 收束 ---------- */
.page-faq .faq-more__panel {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--turf);
  border-left: 3px solid var(--amber);
  border-radius: var(--faq-radius);
  background: linear-gradient(135deg, rgba(30, 58, 51, 0.55), rgba(20, 22, 26, 0.9));
}

.page-faq .faq-more__panel p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mute);
}

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

.page-faq .faq-tail {
  padding-top: clamp(24px, 3.4vw, 36px);
  border-top: 1px solid var(--turf);
}

.page-faq .faq-tail__label {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
}

/* ---------- 窄屏溢出保护 ---------- */
@media (max-width: 599px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .qa__q {
    gap: 10px;
  }

  .page-faq .faq-more__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

/* ---------- 桌面：粘性索引 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(210px, 264px) minmax(0, 1fr);
    align-items: start;
    column-gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    padding-right: 4px;
  }

  .page-faq .faq-index__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__link {
    width: 100%;
    border-radius: var(--radius-s);
    border-color: transparent;
    background: transparent;
    padding: 10px 12px;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: var(--stands);
    border-color: var(--turf);
  }

  .page-faq .faq-sec__head {
    grid-template-columns: auto minmax(0, 1fr);
  }
}

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

  .page-faq .qa,
  .page-faq .faq-index__link {
    transition: none;
  }
}