.page-faq {
  --faq-side-w: 250px;
  --faq-cut: 18px;
  background: var(--ink-900);
  color: var(--paper-100);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: 28px 44px;
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(182, 242, 58, 0.13), transparent 58%),
    radial-gradient(90% 80% at 4% 96%, rgba(255, 122, 51, 0.12), transparent 60%),
    linear-gradient(168deg, var(--ink-950), var(--ink-900) 72%);
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--volt-400), transparent);
  opacity: 0.35;
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 30px;
  align-items: end;
}

.page-faq .faq-hero__copy .breadcrumb {
  margin-bottom: 18px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 10px 0 16px;
  color: var(--paper-100);
}

.page-faq .faq-hero h1::after {
  content: "";
  display: block;
  width: 78px;
  height: 4px;
  margin-top: 16px;
  background: var(--volt-400);
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-faq .faq-hero__lede {
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(242, 235, 221, 0.78);
  margin: 0 0 22px;
}

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

.page-faq .faq-hero__quick a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper-100);
  text-decoration: none;
  border: 1px solid var(--edge);
  border-radius: var(--radius-pill);
  background: rgba(16, 43, 63, 0.7);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-hero__quick a:hover,
.page-faq .faq-hero__quick a:focus-visible {
  border-color: var(--volt-400);
  color: var(--volt-400);
  outline: none;
}

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

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-faq .faq-hero__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray-400);
  border-left: 2px solid var(--ember-500);
  padding-left: 10px;
}

/* ---------- 主体：索引 + 手风琴 ---------- */
.page-faq .faq-body {
  display: grid;
  gap: 22px;
  padding-block: 26px 56px;
}

.page-faq .faq-side {
  position: sticky;
  top: 66px;
  z-index: 4;
  padding: 12px 14px;
  background: rgba(4, 13, 20, 0.94);
  border: 1px solid var(--edge-soft);
  backdrop-filter: blur(8px);
}

.page-faq .faq-side__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray-400);
}

.page-faq .faq-side__nav {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}

.page-faq .faq-side__nav::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-side__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 2px 2px;
  width: max-content;
}

.page-faq .faq-side__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding: 7px 13px;
  font-size: 13px;
  color: rgba(242, 235, 221, 0.82);
  text-decoration: none;
  border-radius: var(--radius-pill);
  border: 1px solid var(--edge);
  background: var(--ink-700);
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-side__list a:hover,
.page-faq .faq-side__list a:focus-visible {
  background: var(--ink-950);
  color: var(--volt-400);
  outline: none;
}

.page-faq .faq-side__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--volt-400);
}

.page-faq .faq-side__tip {
  display: none;
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--gray-400);
}

/* ---------- 分类区块 ---------- */
.page-faq .faq-cat {
  position: relative;
  overflow: hidden;
  padding-block: 26px 6px;
  scroll-margin-top: calc(var(--header-offset) + 10px);
  border-top: 1px solid var(--hair);
}

.page-faq .faq-cat:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-faq .faq-cat__no {
  position: absolute;
  top: -6px;
  right: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(76px, 20vw, 132px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(182, 242, 58, 0.12);
  pointer-events: none;
  user-select: none;
}

.page-faq .faq-cat:nth-of-type(3n + 2) .faq-cat__no {
  color: rgba(255, 122, 51, 0.14);
}

.page-faq .faq-cat:nth-of-type(3n) .faq-cat__no {
  color: rgba(229, 67, 42, 0.13);
}

.page-faq .faq-cat__head {
  position: relative;
  z-index: 1;
  max-width: 62ch;
  margin-bottom: 20px;
}

.page-faq .faq-cat__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 6.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 4px 0 10px;
  color: var(--paper-100);
}

.page-faq .faq-cat__intro {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 235, 221, 0.7);
}

.page-faq .faq-cat__figure {
  margin: 20px 0 26px;
}

.page-faq .faq-cat__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 5;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-faq .faq-cat__figcap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gray-400);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-item {
  margin-bottom: 10px;
  background: var(--ink-700);
  border: 1px solid var(--edge-soft);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-item:hover {
  background: #12324a;
}

.page-faq .faq-item[open] {
  border-color: rgba(182, 242, 58, 0.36);
  background: var(--ink-950);
}

.page-faq .faq-q {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 15px 18px 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-q::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--volt-400);
}

.page-faq .faq-item[open] .faq-q::after {
  content: "–";
  color: var(--ember-500);
}

.page-faq .faq-q:focus-visible {
  outline: 2px solid var(--volt-400);
  outline-offset: -2px;
}

.page-faq .faq-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--gray-400);
  padding-top: 3px;
}

.page-faq .faq-q__text {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--paper-100);
}

.page-faq .faq-item[open] .faq-q__text {
  color: var(--volt-100);
}

.page-faq .faq-a {
  padding: 0 18px 18px 16px;
  border-top: 1px dashed rgba(140, 153, 166, 0.28);
  margin-top: 2px;
  animation: faq-fade 0.22s var(--ease) both;
}

.page-faq .faq-a p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(242, 235, 221, 0.8);
}

.page-faq .faq-a a {
  color: var(--volt-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-a a:hover,
.page-faq .faq-a a:focus-visible {
  color: var(--ember-500);
  outline: none;
}

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

/* ---------- 联系卡片 ---------- */
.page-faq .faq-cat--end {
  border-top: 0;
  padding-top: 34px;
}

.page-faq .faq-contact {
  display: grid;
  gap: 22px;
  margin-top: 4px;
  padding: 22px 20px;
  color: var(--ink-900);
  background: var(--paper-100);
  border: 2px solid var(--ember-500);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-faq .faq-contact__label {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel-500);
}

.page-faq .faq-contact__label:not(:first-child) {
  margin-top: 20px;
}

.page-faq .faq-contact__value {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
  word-break: break-all;
}

.page-faq .faq-copy {
  display: inline-block;
  padding: 7px 16px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--paper-100);
  background: var(--ink-900);
  border: 1px solid var(--ink-900);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-copy:hover,
.page-faq .faq-copy:focus-visible {
  background: var(--ember-500);
  border-color: var(--ember-500);
  color: var(--ink-950);
  outline: none;
}

.page-faq .faq-copy[data-copied] {
  background: var(--volt-400);
  border-color: var(--volt-400);
  color: var(--ink-950);
}

.page-faq .faq-contact__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel-500);
}

.page-faq .faq-contact__note a {
  color: var(--flare-600);
  text-underline-offset: 3px;
}

.page-faq .faq-contact__side {
  padding-top: 18px;
  border-top: 1px solid var(--sand-300);
}

.page-faq .faq-contact__sideTitle {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--ink-900);
}

.page-faq .faq-contact__check {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-check;
}

.page-faq .faq-contact__check li {
  position: relative;
  counter-increment: faq-check;
  padding: 8px 0 8px 30px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--steel-500);
  border-bottom: 1px dashed var(--sand-300);
}

.page-faq .faq-contact__check li:last-child {
  border-bottom: 0;
}

.page-faq .faq-contact__check li::before {
  content: counter(faq-check, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--flare-600);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero {
    padding-block: 36px 54px;
  }

  .page-faq .faq-hero__lede {
    font-size: 17px;
  }

  .page-faq .faq-body {
    padding-block: 34px 68px;
    gap: 30px;
  }

  .page-faq .faq-side__tip {
    display: block;
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--edge-soft);
  }

  .page-faq .status-dot {
    display: inline-block;
    vertical-align: middle;
    margin-right: 7px;
  }

  .page-faq .faq-q__text {
    font-size: 16px;
  }

  .page-faq .faq-a p,
  .page-faq .faq-cat__intro {
    font-size: 16px;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 28px;
    padding: 28px 26px;
  }

  .page-faq .faq-contact__side {
    padding-top: 0;
    padding-left: 26px;
    border-top: 0;
    border-left: 1px solid var(--sand-300);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 44px;
  }

  .page-faq .faq-body {
    grid-template-columns: var(--faq-side-w) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding-block: 44px 84px;
  }

  .page-faq .faq-side {
    position: sticky;
    top: calc(var(--header-offset) + 16px);
    padding: 18px 16px;
    background: var(--ink-950);
  }

  .page-faq .faq-side__nav {
    overflow: visible;
  }

  .page-faq .faq-side__list {
    flex-direction: column;
    gap: 2px;
    width: auto;
  }

  .page-faq .faq-side__list a {
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    padding: 9px 8px 9px 12px;
  }

  .page-faq .faq-side__list a:hover,
  .page-faq .faq-side__list a:focus-visible {
    background: rgba(182, 242, 58, 0.07);
    border-left-color: var(--volt-400);
    color: var(--volt-400);
  }

  .page-faq .faq-cat {
    padding-block: 34px 10px;
  }

  .page-faq .faq-cat:first-child {
    padding-top: 0;
  }

  .page-faq .faq-cat__no {
    top: -18px;
    font-size: clamp(110px, 11vw, 148px);
  }

  .page-faq .faq-q {
    padding: 17px 22px 17px 20px;
  }

  .page-faq .faq-a {
    padding: 0 22px 20px 20px;
  }

  .page-faq .faq-contact {
    padding: 34px 32px;
  }
}

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

  .page-faq .faq-item,
  .page-faq .faq-hero__quick a,
  .page-faq .faq-side__list a,
  .page-faq .faq-copy {
    transition: none;
  }
}