.page-faq {
  background: var(--paper);
  color: var(--graphite);
  overflow-x: hidden;
}

.page-faq .crumbs {
  margin-top: clamp(16px, 2.4vw, 28px);
  margin-bottom: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  border-radius: 0 0 var(--r-xl) var(--r-xl);
  padding: clamp(30px, 6vw, 60px) 0 clamp(32px, 5.4vw, 62px);
  margin-bottom: clamp(30px, 5vw, 58px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  right: -16%;
  top: -28%;
  width: 64%;
  height: 130%;
  background: linear-gradient(152deg, rgba(20, 224, 200, 0.22), rgba(20, 224, 200, 0) 62%);
  transform: rotate(15deg);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  bottom: -32%;
  width: 46%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(169, 184, 174, 0.16), rgba(169, 184, 174, 0) 68%);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 5vw, 50px);
  align-items: center;
}

.page-faq .faq-hero__lead {
  min-width: 0;
}

.page-faq .faq-hero .eyebrow {
  color: var(--cyan-soft);
}

.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(31px, 5.6vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--paper);
  max-width: 16em;
}

.page-faq .faq-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: var(--fs-lede);
  line-height: 1.86;
  color: rgba(245, 242, 234, 0.78);
  max-width: 34em;
}

.page-faq .faq-hero__fig {
  margin: 0;
  min-width: 0;
}

.page-faq .faq-hero__fig .frame {
  border-radius: var(--r-l);
  box-shadow: 0 34px 64px -34px rgba(0, 0, 0, 0.72);
}

.page-faq .faq-metrics {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(28px, 4.6vw, 46px) auto 0;
  padding: 20px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  border-top: 1px solid var(--line-light);
}

.page-faq .faq-metrics li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-faq .faq-metrics .mono {
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.1vw + 11px, 17px);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-faq .faq-metrics li > span:last-child {
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: rgba(245, 242, 234, 0.62);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 92px);
}

.page-faq .faq-aside {
  min-width: 0;
}

.page-faq .faq-aside__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-idx);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-faq .faq-aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-aside__list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 15px;
  border-radius: 999px;
  background: var(--white);
  border: 1px solid var(--line-soft);
  color: var(--ink);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-aside__list a .mono {
  font-family: var(--font-mono);
  font-size: var(--fs-idx);
  letter-spacing: 0.06em;
  color: var(--sage);
}

.page-faq .faq-aside__list a:hover,
.page-faq .faq-aside__list a:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-1px);
}

.page-faq .faq-aside__list a:hover .mono,
.page-faq .faq-aside__list a:focus-visible .mono {
  color: var(--ink);
}

.page-faq .faq-aside__hint {
  margin: 16px 0 0;
  font-size: var(--fs-idx);
  line-height: 1.75;
  color: var(--sage);
  max-width: 22em;
}

.page-faq .faq-main {
  min-width: 0;
}

/* ---------- 分组 ---------- */
.page-faq .faq-group {
  margin-bottom: clamp(36px, 5.4vw, 62px);
}

.page-faq .faq-group:last-of-type {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-faq .faq-group__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 22px);
  padding-bottom: clamp(14px, 2vw, 20px);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-faq .faq-group__head > div {
  min-width: 0;
}

.page-faq .faq-group__head .section-mark {
  font-family: var(--font-mono);
  line-height: 1;
  flex: 0 0 auto;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--fs-h3);
  line-height: 1.3;
  letter-spacing: -0.008em;
  color: var(--ink);
}

.page-faq .faq-group__desc {
  margin: 8px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(34, 49, 58, 0.66);
  max-width: 42em;
}

.page-faq .faq-group__fig {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-faq .faq-group__fig .frame {
  border-radius: var(--r-m);
}

.page-faq .faq-group__fig figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-idx);
  letter-spacing: 0.03em;
  color: var(--sage);
}

.page-faq .faq-group__items {
  display: grid;
  gap: 10px;
}

/* ---------- 问答卡 ---------- */
.page-faq .qa {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .qa:hover:not([open]) {
  border-color: rgba(11, 30, 45, 0.2);
}

.page-faq .qa[open] {
  border-color: rgba(20, 224, 200, 0.55);
  box-shadow: 0 20px 40px -32px rgba(11, 30, 45, 0.6);
}

.page-faq .qa__q {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 16px);
  padding: clamp(15px, 2.2vw, 20px) clamp(14px, 2.4vw, 22px);
  cursor: pointer;
  list-style: none;
  font-size: clamp(15.5px, 0.5vw + 14px, 17.5px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
}

.page-faq .qa__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-idx);
  letter-spacing: 0.07em;
  color: var(--sage);
  padding: 2px 5px;
  border-radius: 4px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__idx {
  background: var(--cyan-soft);
  color: var(--ink);
}

.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__sign {
  position: relative;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--ink);
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.page-faq .qa__sign::before {
  width: 9px;
  height: 1.5px;
}

.page-faq .qa__sign::after {
  width: 1.5px;
  height: 9px;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__sign {
  border-color: var(--ink);
}

.page-faq .qa[open] .qa__sign::after {
  opacity: 0;
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .qa__a {
  padding: 0 clamp(14px, 2.4vw, 22px) clamp(16px, 2.2vw, 20px);
  font-size: var(--fs-base);
  line-height: 1.92;
  color: rgba(34, 49, 58, 0.84);
}

.page-faq .qa__a::before {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(20, 224, 200, 0));
  transform-origin: left center;
  animation: faq-tick 520ms var(--ease) both;
}

.page-faq .qa__a p {
  margin: 14px 0 0;
  max-width: 62ch;
}

.page-faq .qa__a a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--sage);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .qa__a a:hover,
.page-faq .qa__a a:focus-visible {
  border-bottom-color: var(--ink);
}

@keyframes faq-tick {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

/* ---------- 收束面板 ---------- */
.page-faq .faq-help__panel {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  color: var(--paper);
  border-radius: var(--r-l);
  padding: clamp(24px, 4.4vw, 48px);
}

.page-faq .faq-help__panel::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -40%;
  width: 46%;
  height: 150%;
  background: linear-gradient(160deg, rgba(20, 224, 200, 0.2), rgba(20, 224, 200, 0) 65%);
  transform: rotate(16deg);
  pointer-events: none;
}

.page-faq .faq-help__panel .section-mark {
  font-family: var(--font-mono);
  line-height: 1;
}

.page-faq .faq-help__title {
  position: relative;
  z-index: 1;
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 2.6vw + 12px, 38px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 20em;
}

.page-faq .faq-help__text {
  position: relative;
  z-index: 1;
  margin: 16px 0 0;
  font-size: var(--fs-base);
  line-height: 1.9;
  color: rgba(245, 242, 234, 0.76);
  max-width: 44em;
}

.page-faq .faq-help__text a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 245, 232, 0.5);
}

.page-faq .faq-help__text a:hover,
.page-faq .faq-help__text a:focus-visible {
  border-bottom-color: var(--cyan-soft);
}

.page-faq .faq-help__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-faq .faq-hero__fig {
    transform: translateY(10px);
  }
}

@media (min-width: 980px) {
  .page-faq .faq-body {
    grid-template-columns: 224px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-aside__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-faq .faq-aside__list a {
    border-radius: var(--r-s);
    border-color: transparent;
    background: transparent;
    padding: 8px 10px;
    gap: 10px;
  }

  .page-faq .faq-aside__list a:hover,
  .page-faq .faq-aside__list a:focus-visible {
    background: var(--white);
    border-color: var(--line-soft);
    transform: none;
  }
}

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

  .page-faq .faq-aside__list a:hover,
  .page-faq .faq-aside__list a:focus-visible {
    transform: none;
  }
}