.page-faq {
  --faq-ember-deep: #C63A0E;
  background:
    radial-gradient(900px 420px at 88% -8%, rgba(255, 78, 26, 0.14), transparent 62%),
    radial-gradient(700px 420px at 0% 14%, rgba(51, 242, 196, 0.06), transparent 60%),
    var(--ink-950);
  color: var(--chalk-050);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-faq a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(22px, 3vw, 42px) 0 clamp(30px, 4vw, 54px);
  border-bottom: var(--line);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  align-items: end;
}

.page-faq .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog-400);
}

.page-faq .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--seam-600);
}

.page-faq .crumbs a {
  color: var(--fog-400);
  text-decoration: none;
}

.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--chalk-050);
}

.page-faq .faq-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--volt-450);
}

.page-faq .faq-eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--volt-450);
}

.page-faq h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.4vw, 62px);
  line-height: 0.98;
  letter-spacing: -0.01em;
}

.page-faq .faq-hero__lede {
  max-width: 34em;
  margin: 18px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--paper-mist);
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 12px;
  border-left: 1px solid var(--seam-600);
}

.page-faq .faq-hero__stat b {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--volt-450);
}

.page-faq .faq-hero__stat span {
  font-size: 12.5px;
  color: var(--fog-400);
}

.page-faq .faq-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.page-faq .faq-index a {
  display: inline-block;
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog-400);
  text-decoration: none;
  border: 1px solid var(--seam-600);
  background: rgba(20, 28, 43, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out), background-color 0.2s var(--ease-out);
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  color: var(--chalk-050);
  border-color: var(--home-ember);
  background: rgba(255, 78, 26, 0.14);
}

.page-faq .faq-hero__figure {
  position: relative;
  margin: 0;
}

.page-faq .faq-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-faq .faq-hero__figure::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(51, 242, 196, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(51, 242, 196, 0.12) 1px, transparent 1px);
  background-size: 34px 34px;
  mix-blend-mode: screen;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-faq .faq-hero__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--fog-400);
}

/* ---------- 章节骨架 ---------- */
.page-faq .faq-section {
  position: relative;
  padding: clamp(34px, 4.6vw, 64px) 0;
}

.page-faq .faq-section + .faq-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 6%;
  right: 6%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--seam-600) 28%, var(--seam-600) 72%, transparent);
  transform: rotate(-0.35deg);
}

.page-faq .faq-section__head {
  margin-bottom: clamp(20px, 2.6vw, 30px);
  max-width: 62em;
}

.page-faq .faq-section__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--volt-450);
}

.page-faq .faq-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.14;
  letter-spacing: -0.005em;
}

.page-faq .faq-section__lede {
  margin: 10px 0 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--fog-400);
}

/* ---------- 高频五问 ---------- */
.page-faq .quick-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .quick-item {
  position: relative;
  padding: 18px 20px 20px;
  background: linear-gradient(160deg, rgba(20, 28, 43, 0.95), rgba(11, 18, 32, 0.7));
  border: 1px solid var(--seam-600);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: transform 0.24s var(--ease-out), border-color 0.24s var(--ease-out);
}

.page-faq .quick-item:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 78, 26, 0.55);
}

.page-faq .quick-item__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--volt-450);
}

.page-faq .quick-item__q {
  margin: 8px 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--chalk-050);
}

.page-faq .quick-item__a {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--fog-400);
}

.page-faq .quick-item__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--home-ember);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 78, 26, 0.45);
}

.page-faq .quick-item__link:hover,
.page-faq .quick-item__link:focus-visible {
  color: var(--chalk-050);
  border-bottom-color: var(--chalk-050);
}

/* ---------- 图文错位区 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: 22px;
  margin-bottom: 26px;
}

.page-faq .faq-split__text p {
  max-width: 34em;
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-mist);
}

.page-faq .faq-split__figure {
  margin: 0;
}

.page-faq .faq-split__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--seam-600);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-faq .faq-ruler-wrap {
  overflow-x: auto;
  margin-bottom: 26px;
  padding: 8px 0 6px;
  border-top: 1px solid rgba(44, 58, 82, 0.55);
  border-bottom: 1px solid rgba(44, 58, 82, 0.55);
}

.page-faq .faq-ruler {
  display: block;
  width: 100%;
  min-width: 640px;
  height: auto;
}

.page-faq .faq-ruler .axis,
.page-faq .faq-ruler .tick {
  stroke: var(--seam-600);
  stroke-width: 1;
}

.page-faq .faq-ruler .dot--ember { fill: var(--home-ember); }
.page-faq .faq-ruler .dot--volt { fill: var(--volt-450); }
.page-faq .faq-ruler .dot--amber { fill: var(--signal-amber); }
.page-faq .faq-ruler .dot--chalk { fill: var(--paper-mist); }

.page-faq .faq-ruler .lbl {
  fill: var(--chalk-050);
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-faq .faq-ruler .lbl--ember { fill: var(--home-ember); }
.page-faq .faq-ruler .lbl--amber { fill: var(--signal-amber); }

.page-faq .faq-ruler .sub {
  fill: var(--fog-400);
  font-family: var(--font-body);
  font-size: 13px;
}

/* ---------- 三色标记 ---------- */
.page-faq .faq-legend {
  display: grid;
  gap: 12px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-legend li {
  padding: 16px 18px 18px;
  border: 1px solid var(--seam-600);
  background: rgba(11, 18, 32, 0.72);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-faq .faq-chip {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.page-faq .faq-chip--go {
  color: var(--ink-950);
  background: var(--volt-450);
}

.page-faq .faq-chip--doubt {
  color: var(--ink-950);
  background: var(--signal-amber);
}

.page-faq .faq-chip--out {
  color: var(--chalk-050);
  background: var(--alert-rose);
}

.page-faq .faq-legend h3 {
  margin: 12px 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
}

.page-faq .faq-legend p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--fog-400);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-item {
  position: relative;
  margin-bottom: 10px;
  background: rgba(20, 28, 43, 0.6);
  border: 1px solid var(--seam-600);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: background-color 0.24s var(--ease-out), border-color 0.24s var(--ease-out);
}

.page-faq .faq-item[open] {
  background: rgba(20, 28, 43, 0.95);
  border-color: rgba(51, 242, 196, 0.35);
}

.page-faq .faq-item[open]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--volt-450);
}

.page-faq .faq-item > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  list-style: none;
  cursor: pointer;
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--volt-450);
  outline-offset: -2px;
}

.page-faq .faq-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fog-400);
}

.page-faq .faq-item[open] .faq-item__num {
  color: var(--volt-450);
}

.page-faq .faq-item__q {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper-mist);
}

.page-faq .faq-item[open] .faq-item__q {
  font-weight: 700;
  color: var(--chalk-050);
}

.page-faq .faq-item__mark {
  position: relative;
  width: 16px;
  height: 16px;
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--fog-400);
  transition: transform 0.24s var(--ease-out), background-color 0.24s var(--ease-out);
}

.page-faq .faq-item__mark::before {
  left: 0;
  right: 0;
  top: 7px;
  height: 1.5px;
}

.page-faq .faq-item__mark::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 1.5px;
}

.page-faq .faq-item[open] .faq-item__mark::before {
  background: var(--volt-450);
}

.page-faq .faq-item[open] .faq-item__mark::after {
  transform: scaleY(0);
}

.page-faq .faq-item__body {
  padding: 0 18px 18px 48px;
}

.page-faq .faq-item__body p {
  max-width: 40em;
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog-400);
}

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

.page-faq .faq-item__more a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--home-ember);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 78, 26, 0.4);
  padding-bottom: 2px;
}

.page-faq .faq-item__more a:hover,
.page-faq .faq-item__more a:focus-visible {
  color: var(--chalk-050);
  border-bottom-color: var(--chalk-050);
}

/* ---------- 反白章节 ---------- */
.page-faq .faq-section--light {
  background: var(--paper-mist);
  color: var(--ink-950);
}

.page-faq .faq-section--light + .faq-section::before,
.page-faq .faq-section--light::before {
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.9) 28%, rgba(255, 255, 255, 0.9) 72%, transparent);
}

.page-faq .faq-section--light .faq-section__num {
  color: var(--faq-ember-deep);
}

.page-faq .faq-section--light .faq-section__lede {
  color: rgba(5, 7, 10, 0.66);
}

.page-faq .faq-section--light .faq-item {
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(5, 7, 10, 0.14);
}

.page-faq .faq-section--light .faq-item[open] {
  background: #FFFFFF;
  border-color: rgba(255, 78, 26, 0.5);
}

.page-faq .faq-section--light .faq-item[open]::before {
  background: var(--home-ember);
}

.page-faq .faq-section--light .faq-item__num {
  color: rgba(5, 7, 10, 0.45);
}

.page-faq .faq-section--light .faq-item[open] .faq-item__num {
  color: var(--faq-ember-deep);
}

.page-faq .faq-section--light .faq-item__q {
  color: rgba(5, 7, 10, 0.85);
}

.page-faq .faq-section--light .faq-item[open] .faq-item__q {
  color: var(--ink-950);
}

.page-faq .faq-section--light .faq-item__body p {
  color: rgba(5, 7, 10, 0.72);
}

.page-faq .faq-section--light .faq-item__body {
  border-left-color: rgba(5, 7, 10, 0.12);
}

.page-faq .faq-section--light .faq-item__mark::before,
.page-faq .faq-section--light .faq-item__mark::after {
  background: rgba(5, 7, 10, 0.42);
}

.page-faq .faq-section--light .faq-item[open] .faq-item__mark::before {
  background: var(--faq-ember-deep);
}

.page-faq .faq-section--light .faq-item__more a {
  color: var(--faq-ember-deep);
  border-bottom-color: rgba(198, 58, 14, 0.4);
}

.page-faq .faq-section--light .faq-item__more a:hover,
.page-faq .faq-section--light .faq-item__more a:focus-visible {
  color: var(--ink-950);
  border-bottom-color: var(--ink-950);
}

.page-faq .faq-contact {
  display: grid;
  gap: 16px;
  margin-top: 28px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(5, 7, 10, 0.16);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-faq .faq-contact dl {
  display: grid;
  gap: 14px 24px;
  margin: 0;
}

.page-faq .faq-contact dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: rgba(5, 7, 10, 0.5);
}

.page-faq .faq-contact dd {
  margin: 3px 0 0;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-950);
  word-break: break-word;
}

.page-faq .faq-contact dd a {
  color: var(--ink-950);
  text-decoration: none;
  border-bottom: 1px solid rgba(5, 7, 10, 0.32);
}

.page-faq .faq-contact dd a:hover,
.page-faq .faq-contact dd a:focus-visible {
  border-bottom-color: var(--faq-ember-deep);
  color: var(--faq-ember-deep);
}

.page-faq .faq-contact__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(5, 7, 10, 0.6);
}

.page-faq .faq-contact__btn {
  justify-self: start;
  white-space: nowrap;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-contact dl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-faq .faq-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-faq .quick-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .quick-list > li:last-child {
    grid-column: 1 / -1;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 18px 28px;
  }

  .page-faq .faq-contact dl {
    grid-column: 1 / -1;
  }

  .page-faq .faq-contact__note {
    grid-column: 1;
  }

  .page-faq .faq-contact__btn {
    grid-column: 2;
    grid-row: 2;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.16fr) minmax(0, 0.84fr);
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 30px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-item[open] {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.28fr);
  }

  .page-faq .faq-item[open] > summary {
    grid-column: 1;
    align-items: start;
    padding: 18px 18px 18px 20px;
  }

  .page-faq .faq-item[open] > .faq-item__body {
    grid-column: 2;
    padding: 18px 22px 20px 22px;
    border-left: 1px solid var(--seam-600);
  }

  .page-faq .faq-item__mark {
    margin-top: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .quick-item,
  .page-faq .faq-index a,
  .page-faq .faq-item,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after {
    transition: none;
  }

  .page-faq .quick-item:hover {
    transform: none;
  }
}