.page-faq {
  --faq-block-gap: clamp(44px, 7vw, 96px);
  --faq-rail: 2px;
  background: var(--ink);
}

/* ---------- Hero ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 8vw, 104px) 0 clamp(44px, 7vw, 96px);
  background:
    radial-gradient(120% 90% at 84% 4%, rgba(43, 245, 194, 0.16), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--navy) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  align-items: center;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: 22px;
}

.page-faq .faq-hero__label {
  color: var(--mint);
  margin-bottom: 16px;
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(36px, 8.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 15em;
}

.page-faq .faq-hero__intro {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-soft);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

/* ---------- Index / filter ---------- */
.page-faq .faq-index {
  padding: clamp(52px, 8vw, 112px) 0 clamp(36px, 5vw, 60px);
  background: var(--ink);
}

.page-faq .section__title {
  position: relative;
  padding-left: 20px;
  color: var(--paper);
}

.page-faq .section__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.14em;
  bottom: 0.14em;
  width: var(--faq-rail);
  background: var(--line);
}

.page-faq .rule {
  display: block;
  width: 100%;
  height: 1px;
  border: 0;
  background: var(--line);
  margin: 20px 0 26px;
}

.page-faq .faq-index__hint {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .faq-filter__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-faq .faq-filter__chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(14, 32, 38, 0.6);
  color: var(--paper-soft);
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  transition: border-color 160ms ease-out, color 160ms ease-out, background-color 160ms ease-out;
}

.page-faq .faq-filter__chip .num {
  color: var(--mint);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.page-faq .faq-filter__count {
  display: inline-grid;
  place-items: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: var(--radius-pill);
  background: rgba(140, 160, 174, 0.14);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.page-faq .faq-filter__chip:hover {
  border-color: var(--mint);
  color: var(--paper);
}

.page-faq .faq-filter__input:focus-visible + .faq-filter__chip {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

.page-faq .faq-filter__input:checked + .faq-filter__chip {
  background: rgba(43, 245, 194, 0.12);
  border-color: var(--mint);
  color: var(--mint);
}

.page-faq .faq-filter__input:checked + .faq-filter__chip .faq-filter__count {
  background: rgba(43, 245, 194, 0.2);
  color: var(--mint);
}

/* 纯 CSS 类别筛选：勾选某类时收起其余章节 */
.page-faq:has(#cat-start:checked) .faq-block:not(#faq-start),
.page-faq:has(#cat-schedule:checked) .faq-block:not(#faq-schedule),
.page-faq:has(#cat-catalog:checked) .faq-block:not(#faq-catalog),
.page-faq:has(#cat-revisit:checked) .faq-block:not(#faq-revisit),
.page-faq:has(#cat-rounds:checked) .faq-block:not(#faq-rounds),
.page-faq:has(#cat-account:checked) .faq-block:not(#faq-account) {
  display: none;
}

/* ---------- Q&A blocks ---------- */
.page-faq .faq-stream {
  background: var(--ink);
}

.page-faq .faq-block {
  padding: var(--faq-block-gap) 0;
  border-top: 1px solid var(--line);
}

.page-faq .faq-block:nth-child(even) {
  background: var(--navy);
}

.page-faq .faq-block__inner {
  position: relative;
}

.page-faq .faq-block:nth-child(even) .faq-block__head {
  padding-left: clamp(0px, 3vw, 28px);
}

.page-faq .faq-block:target .section__title::before {
  animation: faq-rail-flash 1400ms ease-out 1;
}

@keyframes faq-rail-flash {
  0% { background: var(--mint); }
  45% { background: var(--mint); }
  100% { background: var(--line); }
}

.page-faq .faq-block__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  max-width: 860px;
}

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

/* ---------- Steps ---------- */
.page-faq .steps {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 40px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-faq .steps__item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-areas:
    "n t"
    "n d";
  column-gap: 14px;
  padding-bottom: 24px;
}

.page-faq .steps__item:last-child {
  padding-bottom: 0;
}

.page-faq .steps__item::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 42px;
  bottom: 2px;
  width: 1px;
  background: var(--line);
}

.page-faq .steps__item:last-child::before {
  display: none;
}

.page-faq .steps__num {
  grid-area: n;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  color: var(--mint);
  font-size: 14px;
  transition: background-color 200ms ease-out, border-color 200ms ease-out, color 200ms ease-out;
}

.page-faq .steps__title {
  grid-area: t;
  align-self: center;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .steps__note {
  grid-area: d;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .steps:hover .steps__num {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--ink);
}

.page-faq .steps:hover .steps__item:nth-child(1) .steps__num {
  transition-delay: 0ms;
}

.page-faq .steps:hover .steps__item:nth-child(2) .steps__num {
  transition-delay: 120ms;
}

.page-faq .steps:hover .steps__item:nth-child(3) .steps__num {
  transition-delay: 240ms;
}

/* ---------- Accordion ---------- */
.page-faq .qa-list {
  border-top: 1px solid var(--line);
}

.page-faq .qa {
  border-bottom: 1px solid var(--line);
  border-left: var(--faq-rail) solid transparent;
  transition: border-color 160ms ease-out, background-color 160ms ease-out;
}

.page-faq .qa:hover {
  border-left-color: var(--line);
  background: rgba(14, 32, 38, 0.55);
}

.page-faq .qa[open] {
  border-left-color: var(--mint);
  background: rgba(43, 245, 194, 0.05);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 17px 46px 17px 16px;
  position: relative;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--paper);
  transition: color 160ms ease-out;
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--mint);
}

.page-faq .qa[open] .qa__q::after {
  content: "–";
}

.page-faq .qa[open] .qa__q {
  color: var(--mint);
}

.page-faq .qa__no {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-faq .qa[open] .qa__no {
  color: var(--amber);
}

.page-faq .qa__a {
  margin: 0;
  padding: 0 20px 20px 48px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-soft);
  max-width: 46em;
}

/* ---------- Closer ---------- */
.page-faq .faq-closer {
  padding: clamp(56px, 8vw, 118px) 0 clamp(64px, 9vw, 130px);
  background:
    radial-gradient(90% 70% at 12% 100%, rgba(43, 245, 194, 0.1), transparent 60%),
    var(--room);
  border-top: 1px solid var(--line);
}

.page-faq .faq-closer__panel {
  border: 1px solid var(--line);
  padding: clamp(26px, 4vw, 48px);
}

.page-faq .faq-closer__text {
  margin: 0 0 24px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-soft);
}

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero__intro {
    font-size: 16px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-block__body--with-figure {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    max-width: none;
  }

  .page-faq .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(16px, 3vw, 30px);
  }

  .page-faq .steps__item {
    padding-bottom: 0;
  }

  .page-faq .steps__item::before {
    left: 42px;
    right: -14px;
    top: 19px;
    bottom: auto;
    width: auto;
    height: 1px;
  }
}