.page-faq {
  --faq-hair: 1px solid var(--c-line);
  --faq-gap: clamp(36px, 5vw, 64px);
  color: var(--c-text);
  background: var(--c-void);
  overflow-x: hidden;
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(16px, 2.4vw, 28px) 0 clamp(42px, 6vw, 78px);
  border-bottom: var(--faq-hair);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(28, 42, 68, 0.72) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 42, 68, 0.72) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 95% at 18% 0%, #000 8%, transparent 76%);
  mask-image: radial-gradient(120% 95% at 18% 0%, #000 8%, transparent 76%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -32%;
  right: -18%;
  width: 62vw;
  height: 62vw;
  max-width: 700px;
  max-height: 700px;
  pointer-events: none;
  background: radial-gradient(circle, rgba(69, 224, 224, 0.15), transparent 62%);
}

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

.page-faq .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-faq .faq-hero__lead h1 {
  margin: 14px 0 18px;
  font-size: clamp(1.9rem, 5.6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-faq .faq-hero__lead .lead {
  margin: 0;
  max-width: 46ch;
  color: var(--c-muted);
  line-height: 1.85;
}

.page-faq .faq-hero__hint {
  margin: 22px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--c-cyan);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--c-cyan);
  line-height: 1.7;
}

.page-faq .faq-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-faq .faq-stats > li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 16px;
  background: var(--c-night);
}

.page-faq .faq-stats .kpi__num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 4.2vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-text);
}

.page-faq .faq-stats .faq-unit {
  font-size: 0.55em;
  color: var(--c-muted);
}

.page-faq .faq-stats > li:first-child .kpi__num {
  color: var(--c-amber);
}

.page-faq .faq-stats .kpi__label {
  font-size: var(--fs-12);
  line-height: 1.65;
  color: var(--c-muted);
}

.page-faq .faq-jump {
  margin-top: clamp(24px, 3.5vw, 36px);
  gap: 10px;
}

.page-faq .faq-jump .tag {
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-jump .tag:hover,
.page-faq .faq-jump .tag:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* 主体：索引列 + 问答流 */
.page-faq .faq-body {
  padding: clamp(42px, 6vw, 84px) 0;
}

.page-faq .faq-body__grid {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
}

.page-faq .faq-rail {
  border-top: 2px solid var(--c-cyan);
  padding-top: 16px;
}

.page-faq .faq-rail .eyebrow {
  margin: 0;
  color: var(--c-cyan);
}

.page-faq .faq-index {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-faq .faq-index li + li {
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-index a {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 12px 0;
  color: var(--c-muted);
  font-size: var(--fs-14);
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-faq .faq-index a::before {
  content: "";
  flex: 0 0 auto;
  width: 14px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  color: var(--c-cyan);
  padding-left: 6px;
}

.page-faq .faq-index .idx-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-cyan);
  opacity: 0.85;
}

.page-faq .faq-rail__top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 8px 12px;
  border: 1px solid var(--c-line);
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-rail__top:hover,
.page-faq .faq-rail__top:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-faq .faq-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

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

.page-faq .faq-figure--flush {
  margin-bottom: 0;
}

/* 分组 */
.page-faq .faq-group {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-group + .faq-group {
  margin-top: var(--faq-gap);
}

.page-faq .faq-grp__head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding-bottom: 14px;
  margin-bottom: 2px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-grp__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4.6vw, 2.6rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: rgba(69, 224, 224, 0.18);
  -webkit-text-stroke: 1px var(--c-cyan);
}

.page-faq .faq-grp__title {
  margin: 0;
  font-size: clamp(1.25rem, 2.8vw, 1.75rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-faq .faq-grp__lede {
  margin: 8px 0 0;
  max-width: 52ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-muted);
}

/* 折叠问答 */
.page-faq .fold {
  border-bottom: 1px solid var(--c-line);
}

.page-faq .fold__item + .fold__item {
  border-top: 1px solid var(--c-line);
}

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

.page-faq .fold__trigger {
  width: 100%;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  justify-content: space-between;
  padding: 18px 0;
  background: none;
  border: 0;
  color: var(--c-text);
  font-family: inherit;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-faq .fold__trigger:hover {
  color: var(--c-cyan);
}

.page-faq .fold__trigger:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 3px;
  border-radius: 2px;
}

.page-faq .fold__icon {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  margin-top: 7px;
  border-right: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.page-faq .fold__trigger[aria-expanded="true"] .fold__icon {
  transform: rotate(-135deg);
}

.page-faq .fold__panel {
  padding: 0 0 20px 20px;
  margin-left: 1px;
  border-left: 1px solid var(--c-line);
  color: var(--c-muted);
  font-size: var(--fs-14);
  line-height: 1.85;
  transition: border-color var(--dur) var(--ease);
}

.page-faq .fold__trigger[aria-expanded="true"] + .fold__panel {
  border-left-color: var(--c-cyan);
}

.page-faq .fold__panel p {
  margin: 0 0 10px;
  max-width: 48ch;
}

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

.page-faq .fold__panel a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 自查清单 */
.page-faq .faq-check {
  padding: 0 0 clamp(48px, 6vw, 88px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-check__panel {
  padding: clamp(24px, 4vw, 46px);
}

.page-faq .faq-check__head {
  margin-bottom: clamp(22px, 3.5vw, 34px);
}

.page-faq .faq-check__head .eyebrow {
  margin: 0 0 10px;
  color: var(--c-cyan);
}

.page-faq .faq-check__title {
  margin: 0;
  max-width: 26ch;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-faq .faq-check__lede {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-check__grid {
  display: grid;
  gap: clamp(26px, 4vw, 42px);
}

.page-faq .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(28, 42, 68, 0.9);
  border: 1px solid rgba(28, 42, 68, 0.9);
}

.page-faq .checklist > li {
  background: rgba(7, 11, 20, 0.55);
}

.page-faq .check {
  position: relative;
  display: flex;
  gap: 13px;
  align-items: flex-start;
  padding: 14px 16px;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease);
}

.page-faq .check:hover {
  background: rgba(69, 224, 224, 0.06);
}

.page-faq .check input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .check__box {
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border: 1.5px solid var(--c-line);
  background: rgba(16, 26, 46, 0.8);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .check input:checked + .check__box {
  border-color: var(--c-cyan);
  background: rgba(69, 224, 224, 0.14);
}

.page-faq .check input:checked + .check__box::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 6px;
  height: 11px;
  border-right: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(40deg);
}

.page-faq .check input:focus-visible + .check__box {
  outline: 2px solid var(--c-focus);
  outline-offset: 2px;
}

.page-faq .check__text {
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-text);
  transition: color var(--dur) var(--ease);
}

.page-faq .check input:checked ~ .check__text {
  color: var(--c-cyan);
}

.page-faq .faq-readout {
  margin-top: 22px;
  padding: 16px 18px;
  border-left: 2px solid var(--c-amber);
  background: rgba(7, 11, 20, 0.55);
}

.page-faq .faq-readout p {
  margin: 0 0 10px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-muted);
}

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

/* 排查步骤 */
.page-faq .faq-fix {
  padding: 0 0 clamp(48px, 6vw, 88px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-fix__head {
  border-top: var(--faq-hair);
  padding-top: clamp(26px, 3.5vw, 40px);
}

.page-faq .faq-fix__head .eyebrow {
  margin: 0 0 10px;
  color: var(--c-cold);
}

.page-faq .faq-fix__title {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-faq .faq-fix__lede {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-fix__list {
  list-style: none;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-faq .faq-fix__list > li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 18px;
  background: var(--c-night);
  transition: background-color var(--dur) var(--ease);
}

.page-faq .faq-fix__list > li:hover {
  background: var(--c-panel);
}

.page-faq .faq-fix__num {
  font-size: var(--fs-14);
  line-height: 1.4;
  color: var(--c-cyan);
  letter-spacing: 0.04em;
}

.page-faq .faq-fix__list h3 {
  margin: 0;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.5;
}

.page-faq .faq-fix__list p {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-muted);
  max-width: 52ch;
}

.page-faq .faq-fix__list a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 反馈 */
.page-faq .faq-next {
  padding: 0 0 clamp(56px, 7vw, 96px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .faq-next__panel {
  padding: clamp(26px, 4vw, 52px);
}

.page-faq .faq-next__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-faq .faq-next__panel .eyebrow {
  margin: 0 0 10px;
  color: var(--c-amber);
}

.page-faq .faq-next__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-faq .faq-next__text {
  margin: 14px 0 22px;
  max-width: 50ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-text);
  opacity: 0.88;
}

.page-faq .faq-contact-wrap {
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid rgba(232, 238, 249, 0.16);
}

.page-faq .faq-contact {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-contact > div {
  display: grid;
  gap: 5px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(232, 238, 249, 0.18);
}

.page-faq .faq-contact dt {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

.page-faq .faq-contact dd {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.6;
  color: var(--c-text);
  word-break: break-word;
}

.page-faq .faq-contact__note {
  margin: 14px 0 0;
  font-size: var(--fs-12);
  line-height: 1.75;
  color: var(--c-muted);
}

/* 响应式 */
@media (min-width: 620px) {
  .page-faq .faq-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr);
    align-items: start;
    gap: clamp(36px, 4vw, 64px);
  }

  .page-faq .faq-body__grid {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(40px, 4vw, 64px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }

  .page-faq .faq-check__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-faq .faq-next__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-faq .faq-contact-wrap {
    padding-top: 0;
    border-top: 0;
    border-left: 1px solid rgba(232, 238, 249, 0.16);
    padding-left: clamp(22px, 3vw, 34px);
  }
}

@media (max-width: 480px) {
  .page-faq .faq-grp__head {
    flex-direction: column;
    gap: 8px;
  }

  .page-faq .faq-fix__list > li {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .page-faq .fold__panel {
    padding-left: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .fold__icon,
  .page-faq .fold__panel,
  .page-faq .check,
  .page-faq .check__box,
  .page-faq .check__text,
  .page-faq .faq-index a,
  .page-faq .faq-fix__list > li {
    transition: none;
  }
}