.page-faq {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  overflow-x: hidden;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-faq .faq-shell {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: clamp(16px, 3.4vw, 40px);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: clamp(22px, 3.6vw, 40px) 0 clamp(26px, 4vw, 48px);
  border-bottom: 1px solid rgba(10, 76, 139, 0.22);
  background:
    radial-gradient(120% 88% at 90% 4%, rgba(255, 90, 31, 0.11), transparent 58%),
    radial-gradient(92% 72% at 4% 102%, rgba(0, 224, 198, 0.12), transparent 62%);
}

.page-faq .faq-hero__crumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-faq .faq-hero__title {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(29px, 5.2vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  max-width: 18ch;
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.72;
  color: var(--slate);
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3.4vw, 46px);
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-faq .faq-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  min-width: 150px;
}

.page-faq .faq-metric__value {
  font-family: var(--mono);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 600;
  color: var(--river);
  letter-spacing: -0.01em;
}

.page-faq .faq-metric__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--slate);
  max-width: 26ch;
}

/* ---------- 问题分组速览 ---------- */

.page-faq .faq-index__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 40px);
  padding-block: clamp(30px, 4.6vw, 56px);
}

.page-faq .faq-index__title {
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 8px 0 0;
}

.page-faq .faq-index__lede {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
  max-width: 46ch;
}

.page-faq .faq-card-grid {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.page-faq .faq-card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  height: 100%;
  padding: 15px 17px;
  background: var(--paper-3);
  border: 1px solid rgba(20, 32, 43, 0.13);
  border-radius: var(--radius-organic);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .faq-card:hover,
.page-faq .faq-card:focus-visible {
  border-color: var(--cyan);
  background: var(--paper-2);
  transform: translateY(-2px);
  outline: none;
}

.page-faq .faq-card__num {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--river);
  flex: none;
  padding-top: 2px;
}

.page-faq .faq-card__text {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-faq .faq-card__title {
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-faq .faq-card__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.page-faq .faq-index__figure {
  margin: 0;
  border-radius: var(--radius-organic);
  overflow: hidden;
  border: 1px solid rgba(10, 76, 139, 0.2);
  align-self: start;
}

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

/* ---------- 搜索过滤 ---------- */

.page-faq .faq-search-wrap {
  padding-block: clamp(18px, 2.6vw, 28px) 4px;
}

.page-faq .faq-search {
  border-top: 1px solid rgba(20, 32, 43, 0.14);
  border-bottom: 1px solid rgba(20, 32, 43, 0.14);
  padding-block: 12px;
}

/* ---------- 问答分组 ---------- */

.page-faq .faq-groups {
  display: flex;
  flex-direction: column;
}

.page-faq .faq-group {
  padding-block: clamp(30px, 4.6vw, 56px);
  border-top: 1px solid rgba(20, 32, 43, 0.12);
  scroll-margin-top: 90px;
}

.page-faq .faq-group:first-child {
  border-top: 0;
}

.page-faq .faq-group__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 38px);
  align-items: start;
}

.page-faq .faq-group__title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(21px, 2.7vw, 29px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-faq .faq-group__title::before {
  content: "";
  flex: none;
  width: 5px;
  align-self: stretch;
  min-height: 24px;
  background: var(--river);
  border-radius: 3px;
}

.page-faq .faq-group--glossary .faq-group__title::before {
  background: var(--green);
}

.page-faq .faq-group__lede {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--slate);
  max-width: 56ch;
}

.page-faq .faq-group__list {
  margin-top: clamp(14px, 2vw, 22px);
}

/* ---------- 单条问答 ---------- */

.page-faq .faq-qa {
  border-top: 1px solid rgba(20, 32, 43, 0.14);
}

.page-faq .faq-group__list > .faq-qa:last-child {
  border-bottom: 1px solid rgba(20, 32, 43, 0.14);
}

.page-faq .faq-qa__q {
  display: flex;
  align-items: baseline;
  gap: 13px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
  transition: color 0.18s var(--ease);
}

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

.page-faq .faq-qa__q:hover,
.page-faq .faq-qa__q:focus-visible {
  color: var(--river);
  outline: none;
}

.page-faq .faq-qa__q-num {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--slate);
  flex: none;
  padding-top: 2px;
}

.page-faq .faq-qa__q-text {
  flex: 1 1 auto;
}

.page-faq .faq-qa__mark {
  flex: none;
  width: 0;
  height: 0;
  margin-left: 8px;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--river);
  transform: translateY(-1px);
  transition: border-top-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-faq .faq-qa[open] .faq-qa__mark {
  border-top-color: var(--cyan);
  transform: rotate(180deg) translateY(-1px);
}

.page-faq .faq-qa__body {
  display: flex;
  flex-direction: column;
  gap: 13px;
  padding: 2px 0 22px;
}

.page-faq .faq-qa[open] .faq-qa__body {
  animation: faq-fade 0.22s var(--ease) both;
}

.page-faq .faq-qa__conclusion {
  margin: 0;
  padding: 12px 16px;
  background: var(--green);
  color: #F1F7F4;
  border-radius: 8px 22px 8px 22px;
  font-size: 15px;
  line-height: 1.66;
}

.page-faq .faq-qa__steps {
  list-style: none;
  counter-reset: faq-step;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-faq .faq-qa__steps > li {
  counter-increment: faq-step;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 8px;
  font-size: 15px;
  line-height: 1.68;
}

.page-faq .faq-qa__steps > li::before {
  content: counter(faq-step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 14.5px;
  color: var(--river);
  line-height: 1.7;
}

.page-faq .faq-qa__steps a {
  color: var(--river);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .faq-qa__steps a:hover {
  color: var(--orange);
}

.page-faq .faq-qa__note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-faq .faq-qa__note a {
  color: var(--river);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 侧栏边注 ---------- */

.page-faq .faq-group__aside {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 18px;
  background: var(--paper-2);
  border-left: 3px solid var(--gold);
  border-radius: 6px 20px 6px 20px;
}

.page-faq .faq-aside__label {
  margin: 0;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-aside__label + .faq-aside__terms,
.page-faq .faq-aside__label + .faq-aside__link {
  margin-top: -2px;
}

.page-faq .faq-aside__terms {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-faq .faq-aside__terms .tag {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--river);
  border-color: rgba(10, 76, 139, 0.32);
}

.page-faq .faq-aside__link {
  margin: 0;
  font-size: 13.5px;
}

/* ---------- 术语速查 ---------- */

.page-faq .faq-glossary {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.page-faq .faq-glossary__item {
  padding: 15px 17px;
  background: var(--paper-2);
  border-top: 2px solid var(--river);
  border-radius: 6px 18px 6px 18px;
}

.page-faq .faq-glossary__term {
  margin: 0 0 7px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--river);
}

.page-faq .faq-glossary__desc {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 联系区块 ---------- */

.page-faq .faq-contact {
  padding-top: clamp(30px, 4.6vw, 56px);
}

.page-faq .faq-help {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(24px, 4vw, 46px);
  background: var(--river-deep);
  color: #E9F1F8;
  border-radius: var(--radius-organic);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-help::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -70px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 224, 198, 0.22), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-help__eyebrow {
  color: var(--peach);
}

.page-faq .faq-help__title {
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 8px 0 0;
  color: #FFFFFF;
}

.page-faq .faq-help__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .faq-help__list > li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  font-size: 15px;
  line-height: 1.66;
  color: #D8E5F0;
}

.page-faq .faq-help__list > li::before {
  content: "—";
  font-family: var(--mono);
  color: var(--cyan);
  line-height: 1.66;
}

.page-faq .faq-help__note {
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 13.5px;
  line-height: 1.7;
  color: #B9CBDB;
}

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

.page-faq .faq-help__link .link-more {
  color: var(--cyan);
}

.page-faq .faq-help__channels {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .faq-channel {
  padding: 16px 18px;
  background: rgba(246, 241, 231, 0.07);
  border: 1px solid rgba(0, 224, 198, 0.28);
  border-radius: 6px 20px 6px 20px;
}

.page-faq .faq-channel__key {
  margin: 0;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-channel__value {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.5;
  color: #FFFFFF;
  word-break: break-word;
}

.page-faq .faq-channel__hint {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: #A9BECC;
}

/* ---------- 动效 ---------- */

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

/* ---------- 响应式 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-index__inner {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-group__inner {
    grid-template-columns: minmax(0, 1fr) 236px;
  }
  .page-faq .faq-help {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
  .page-faq .faq-hero__title {
    max-width: 20ch;
  }
}

@media (max-width: 720px) {
  .page-faq .faq-hero__meta {
    gap: 16px;
  }
  .page-faq .faq-metric {
    min-width: 0;
    flex: 1 1 46%;
  }
  .page-faq .faq-qa__q {
    font-size: 15.5px;
  }
  .page-faq .faq-qa__steps > li {
    grid-template-columns: 28px minmax(0, 1fr);
  }
  .page-faq .faq-index__figure {
    border-radius: 10px 18px 10px 18px;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-card-grid {
    grid-template-columns: 1fr;
  }
  .page-faq .faq-glossary {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-qa[open] .faq-qa__body {
    animation: none;
  }
  .page-faq .faq-card,
  .page-faq .faq-qa__mark,
  .page-faq .faq-qa__q {
    transition: none;
  }
}
</main>