.page-faq {
  --faq-rule: rgba(28, 58, 46, 0.9);
  --faq-panel: rgba(15, 42, 32, 0.5);
  --faq-soft: rgba(28, 58, 46, 0.55);
  background: var(--ink);
  color: var(--bone);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumbs {
  padding-top: clamp(14px, 2.4vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 56px) 0 clamp(40px, 6vw, 84px);
  background:
    radial-gradient(130% 95% at 84% 4%, rgba(15, 42, 32, 0.95) 0%, rgba(15, 42, 32, 0) 62%),
    linear-gradient(178deg, var(--pitch) 0%, var(--ink) 76%);
  overflow: hidden;
}

.page-faq .faq-hero__slash {
  position: absolute;
  left: -6%;
  right: -6%;
  bottom: 4px;
  height: 7px;
  background: linear-gradient(90deg, var(--volt) 0%, var(--fluoro) 46%, var(--moss) 100%);
  transform: rotate(-1.6deg);
  transform-origin: left center;
  opacity: 0.75;
  pointer-events: none;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

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

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 8.6vw, 100px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--bone);
}

.page-faq .faq-hero__lead {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 40em;
}

.page-faq .faq-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(18px, 3vw, 38px);
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 96px;
}

.page-faq .faq-hero__meta-item dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-faq .faq-hero__meta-item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--fluoro);
}

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

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding: clamp(36px, 5vw, 72px) 0 clamp(20px, 3vw, 40px);
}

.page-faq .faq-layout {
  display: grid;
  gap: clamp(32px, 5vw, 60px);
  align-items: start;
}

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

/* ---------- 问题分组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 118px;
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 5.5vw, 72px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  margin-bottom: clamp(10px, 1.6vw, 18px);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--volt);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--bone);
}

.page-faq .faq-group__hint {
  grid-column: 2;
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--rock);
}

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

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

.page-faq .faq-item__q {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-faq .faq-trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: start;
  width: 100%;
  padding: clamp(15px, 2vw, 21px) 0;
  background: none;
  border: 0;
  color: inherit;
  text-align: left;
  font: inherit;
  cursor: pointer;
}

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

.page-faq .faq-trigger__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 28px;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--rock);
  background: var(--faq-soft);
  border: 1px solid var(--moss);
  clip-path: polygon(0 0, calc(100% - var(--cut-sm)) 0, 100% var(--cut-sm), 100% 100%, 0 100%);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-faq .faq-item[data-open] .faq-trigger__idx {
  background: var(--fluoro);
  border-color: var(--fluoro);
  color: var(--ink);
}

.page-faq .faq-trigger__text {
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.42;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--bone);
  transition: color 0.18s ease;
}

.page-faq .faq-trigger:hover .faq-trigger__text {
  color: var(--fluoro);
}

.page-faq .faq-trigger__icon {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 7px;
  flex: none;
}

.page-faq .faq-trigger__icon::before,
.page-faq .faq-trigger__icon::after {
  content: "";
  position: absolute;
  background: var(--rock);
  transition: transform 0.22s ease, background 0.22s ease;
}

.page-faq .faq-trigger__icon::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-faq .faq-trigger__icon::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .faq-item[data-open] .faq-trigger__icon::before {
  background: var(--fluoro);
}

.page-faq .faq-item[data-open] .faq-trigger__icon::after {
  transform: scaleY(0);
  background: var(--fluoro);
}

.page-faq .faq-panel {
  padding: 0;
}

.page-faq .faq-answer {
  padding: 0 0 clamp(18px, 2.4vw, 26px) 0;
  max-width: 40em;
}

.page-faq .faq-answer p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  letter-spacing: 0.01em;
  color: rgba(242, 240, 230, 0.86);
}

.page-faq .faq-answer + .faq-answer {
  margin-top: 12px;
}

.page-faq .faq-answer__link {
  color: var(--fluoro);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 245, 66, 0.42);
  padding-bottom: 1px;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-faq .faq-answer__link:hover {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

/* ---------- 口径示意图 ---------- */
.page-faq .faq-diagram {
  margin: 0 0 clamp(14px, 2vw, 22px);
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px) clamp(10px, 1.4vw, 14px);
  background: var(--faq-panel);
  border: 1px solid var(--moss);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-faq .faq-diagram svg {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
}

.page-faq .faq-diagram .d-base {
  stroke: var(--bone);
  stroke-opacity: 0.28;
  stroke-width: 1.4;
}

.page-faq .faq-diagram .d-tick {
  stroke: var(--rock);
  stroke-width: 1;
}

.page-faq .faq-diagram .d-fluoro {
  fill: var(--fluoro);
}

.page-faq .faq-diagram .d-volt {
  fill: var(--volt);
}

.page-faq .faq-diagram .d-net {
  fill: var(--moss);
}

.page-faq .faq-diagram .d-y {
  fill: var(--card-y);
}

.page-faq .faq-diagram .d-r {
  fill: var(--card-r);
}

.page-faq .faq-diagram .d-label {
  fill: var(--rock);
  font-family: var(--font-mono);
  font-size: 11px;
}

.page-faq .faq-diagram figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--rock);
}

/* ---------- 联络区配图 ---------- */
.page-faq .faq-contact-media {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 560px;
}

/* ---------- 右侧索引 ---------- */
.page-faq .faq-side {
  min-width: 0;
}

.page-faq .faq-toc {
  padding: clamp(16px, 2vw, 22px) clamp(14px, 1.8vw, 20px);
  background: var(--faq-panel);
  border: 1px solid var(--moss);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--rock);
}

.page-faq .faq-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-toc__list li + li {
  margin-top: 2px;
}

.page-faq .faq-toc__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  text-decoration: none;
  color: var(--rock);
  font-size: 14px;
  line-height: 1.5;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--bone);
  background: rgba(28, 58, 46, 0.62);
}

.page-faq .faq-toc__link.is-active {
  color: var(--fluoro);
  border-left-color: var(--fluoro);
  background: rgba(198, 245, 66, 0.06);
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: inherit;
  opacity: 0.85;
}

.page-faq .faq-toc__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--faq-rule);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--rock);
}

/* ---------- 尾部 ---------- */
.page-faq .faq-tail {
  padding: clamp(38px, 5.5vw, 80px) 0 clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, rgba(11, 15, 13, 0) 0%, rgba(15, 42, 32, 0.72) 100%);
}

.page-faq .faq-tail__card {
  padding: clamp(22px, 3.4vw, 44px);
  background: rgba(11, 15, 13, 0.72);
}

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

.page-faq .faq-tail__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--bone);
}

.page-faq .faq-tail__text {
  margin: clamp(12px, 1.8vw, 18px) 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 240, 230, 0.84);
}

.page-faq .faq-tail__contact {
  display: grid;
  gap: 12px clamp(18px, 3vw, 34px);
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding-top: clamp(16px, 2.2vw, 22px);
  border-top: 1px solid var(--faq-rule);
}

.page-faq .faq-tail__contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .faq-tail__contact-item dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-faq .faq-tail__contact-item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--bone);
  word-break: break-word;
}

.page-faq .faq-tail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.8vw, 30px);
}

.page-faq .faq-tail__note {
  margin: clamp(14px, 2vw, 20px) 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--clay);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 响应式 ---------- */
@media (max-width: 639px) {
  .page-faq .faq-trigger {
    gap: 11px;
  }

  .page-faq .faq-trigger__idx {
    min-width: 32px;
    height: 26px;
    font-size: 11px;
  }

  .page-faq .faq-answer {
    padding-left: 0;
  }

  .page-faq .faq-tail__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (min-width: 640px) {
  .page-faq .faq-answer {
    padding-left: 50px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: minmax(0, 7.4fr) minmax(250px, 3fr);
    gap: clamp(40px, 5vw, 76px);
  }

  .page-faq .faq-side {
    position: sticky;
    top: 118px;
    align-self: start;
  }

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

@media (min-width: 1200px) {
  .page-faq .faq-main {
    padding-right: clamp(0px, 2vw, 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-trigger__idx,
  .page-faq .faq-trigger__icon::before,
  .page-faq .faq-trigger__icon::after,
  .page-faq .faq-toc__link,
  .page-faq .faq-answer__link,
  .page-faq .faq-trigger__text {
    transition: none;
  }
}