/* ============================================================
   PAGE: 使用教程 / tutorial  ( scope: .page-faq )
   Desktop-first rhythm: hero -> sticky category rail + Q&A flow
   ============================================================ */

.page-faq {
  --faq-rail: rgba(201, 162, 39, .30);
  --faq-rail-on: rgba(255, 107, 74, .65);
  --faq-line: rgba(11, 37, 69, .10);
  --faq-line-strong: rgba(11, 37, 69, .18);
  --faq-chip-bg: rgba(230, 238, 247, .55);
  --faq-body-size: 16px;
  display: block;
}

/* ---------- breadcrumbs ---------- */

.page-faq .faq-crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- hero ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: 24px 0 48px;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% 40% 40%;
  background:
    radial-gradient(ellipse at 70% 30%, rgba(111, 211, 188, .22), transparent 62%),
    radial-gradient(ellipse at 30% 80%, rgba(18, 58, 99, .16), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

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

.page-faq .faq-hero h1 {
  margin: 14px 0 18px;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: .02em;
  font-weight: 700;
  color: var(--abyss);
}

.page-faq .faq-hero__lead {
  max-width: 46ch;
  font-size: var(--faq-body-size);
  line-height: 1.9;
  color: var(--grey);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero__stat-num {
  font-size: 20px;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-faq .faq-hero__stat-label {
  font-size: 14px;
  color: var(--grey);
}

.page-faq .faq-hero__media {
  position: relative;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-gold);
  background: var(--white);
  padding: 10px;
  box-shadow: 0 18px 44px rgba(11, 37, 69, .08);
}

.page-faq .faq-hero__media .media-frame__inner {
  overflow: hidden;
  border-radius: var(--radius-s);
  background: var(--shallow);
}

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

.page-faq .faq-hero__media .media-frame__caption {
  display: block;
  padding: 10px 4px 2px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--grey);
  font-family: var(--font-mono);
}

/* ---------- .page-faq layout ---------- */

.page-faq .page-faq__body {
  padding-top: 8px;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

/* ---------- left rail ---------- */

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

.page-faq .faq-aside__eyebrow {
  margin-bottom: 12px;
}

.page-faq .faq-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 12px;
  margin: 0;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-nav__item {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-m);
  background: var(--white);
  color: var(--abyss);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  transition:
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-faq .faq-nav__item:hover,
.page-faq .faq-nav__item:focus-visible {
  border-color: var(--coral);
  color: var(--abyss);
  background: rgba(255, 107, 74, .06);
}

.page-faq .faq-nav__item:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-faq .faq-nav__num {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-faq .faq-nav__label {
  font-weight: 700;
  letter-spacing: .02em;
}

.page-faq .faq-nav__count {
  font-size: 12px;
  color: var(--grey);
  border-left: 1px solid var(--faq-line);
  padding-left: 10px;
}

.page-faq .faq-aside__note {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- Q&A flow ---------- */

.page-faq .faq-flow {
  min-width: 0;
  display: grid;
  gap: 48px;
}

.page-faq .faq-cat {
  scroll-margin-top: 120px;
}

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

.page-faq .faq-cat__index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-s);
  background: linear-gradient(135deg, var(--abyss) 0%, var(--hull) 100%);
  color: var(--gold-lite);
  font-size: 14px;
  letter-spacing: .04em;
}

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

.page-faq .faq-cat__title {
  margin: 0;
  font-size: 22px;
  line-height: 1.34;
  letter-spacing: .02em;
  color: var(--abyss);
}

.page-faq .faq-cat__desc {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

.page-faq .faq-cat__list {
  margin-top: 4px;
}

/* ---------- single Q&A item ---------- */

.page-faq .qa {
  position: relative;
  padding-left: 30px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 34px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--faq-rail), transparent 88%);
  transition: background var(--dur) var(--ease);
  pointer-events: none;
}

.page-faq .qa[open]::before {
  background: linear-gradient(to bottom, var(--faq-rail-on), rgba(255, 107, 74, .08) 88%);
}

.page-faq .qa:last-child {
  border-bottom: none;
}

.page-faq .qa__summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 22px 0;
  cursor: pointer;
  list-style: none;
  color: var(--abyss);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .qa__summary:hover .qa__question {
  color: var(--hull);
}

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

.page-faq .qa__marker {
  position: absolute;
  left: 4px;
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--faq-line-strong);
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
  z-index: 1;
}

.page-faq .qa[open] .qa__marker {
  background: var(--coral);
  border-color: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, .16);
}

.page-faq .qa__question {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 16px;
  line-height: 1.72;
  font-weight: 700;
  letter-spacing: .01em;
  transition: color var(--dur) var(--ease);
}

.page-faq .qa__toggle {
  flex: 0 0 auto;
  align-self: flex-start;
  margin-left: auto;
  padding-top: 5px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--grey);
  transition: color var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__toggle {
  font-size: 0;
  color: var(--coral);
}

.page-faq .qa[open] .qa__toggle::after {
  content: "收起";
  font-size: 12px;
  letter-spacing: .06em;
}

.page-faq .qa__body {
  padding: 0 0 26px 0;
  font-size: var(--faq-body-size);
  line-height: 1.9;
  color: var(--grey);
  animation: faq-reveal var(--dur) var(--ease) both;
}

.page-faq .qa__body > p {
  margin: 0;
}

.page-faq .qa__body > p + p,
.page-faq .qa__body > p + ol,
.page-faq .qa__body > ol + p {
  margin-top: 14px;
}

.page-faq .qa__body strong {
  color: var(--abyss);
  font-weight: 700;
}

.page-faq .qa__note {
  margin-top: 14px;
  padding: 10px 14px;
  border-left: 2px solid var(--emerald);
  background: rgba(14, 124, 102, .06);
  font-size: 14px;
  line-height: 1.8;
  color: var(--hull);
}

/* ---------- numbered step list ---------- */

.page-faq .qa__steps {
  counter-reset: qa-step;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .qa__steps li {
  counter-increment: qa-step;
  position: relative;
  padding-left: 40px;
  min-height: 26px;
  font-size: var(--faq-body-size);
  line-height: 1.78;
  color: var(--grey);
}

.page-faq .qa__steps li::before {
  content: counter(qa-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(14, 124, 102, .34);
  background: rgba(14, 124, 102, .08);
  color: var(--emerald);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
  line-height: 1;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- inline figure between categories ---------- */

.page-faq .faq-inline-media {
  margin: 0;
  padding: 0;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-gold);
  background:
    linear-gradient(135deg, rgba(230, 238, 247, .9) 0%, rgba(250, 251, 252, 1) 70%);
  overflow: hidden;
}

.page-faq .faq-inline-media .media-frame__inner {
  overflow: hidden;
}

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

.page-faq .faq-inline-media .media-frame__caption {
  display: block;
  padding: 12px 18px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--grey);
  border-top: 1px solid var(--faq-line);
}

/* ---------- closing call ---------- */

.page-faq .faq-next {
  padding-bottom: 72px;
}

.page-faq .faq-next__panel {
  position: relative;
  overflow: hidden;
  padding: 36px 28px;
  border-radius: var(--radius-m);
  background:
    radial-gradient(ellipse at 100% 0%, rgba(201, 162, 39, .28), transparent 55%),
    radial-gradient(ellipse at 0% 100%, rgba(14, 124, 102, .34), transparent 55%),
    linear-gradient(140deg, var(--abyss) 0%, var(--hull) 100%);
  color: var(--text-on-dark);
  display: grid;
  gap: 24px;
}

.page-faq .faq-next__panel::after {
  content: "";
  position: absolute;
  top: 18px;
  right: 18px;
  width: 56px;
  height: 56px;
  border-top: 1px solid var(--line-gold);
  border-right: 1px solid var(--line-gold);
  border-top-right-radius: var(--radius-s);
  pointer-events: none;
}

.page-faq .faq-next__eyebrow {
  color: var(--gold-lite);
  margin-bottom: 10px;
}

.page-faq .faq-next__text h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--white);
}

.page-faq .faq-next__text p {
  margin-top: 12px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-on-dark);
}

.page-faq .faq-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: end;
}

/* ============================================================
   responsive
   ============================================================ */

@media (min-width: 720px) {
  .page-faq .faq-hero h1 {
    font-size: 34px;
  }

  .page-faq .faq-next__panel {
    padding: 44px 40px;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 36px 0 64px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: center;
  }

  .page-faq .faq-hero h1 {
    font-size: 40px;
    line-height: 1.24;
  }

  .page-faq .faq-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 104px;
    align-self: start;
    padding-right: 8px;
    border-right: 1px solid var(--faq-line);
  }

  .page-faq .faq-nav {
    flex-direction: column;
    overflow: visible;
    padding: 0;
    gap: 2px;
  }

  .page-faq .faq-nav__item {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 12px;
    border-color: transparent;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-s) var(--radius-s) 0;
    background: transparent;
    white-space: normal;
  }

  .page-faq .faq-nav__item:hover,
  .page-faq .faq-nav__item:focus-visible {
    border-left-color: var(--coral);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
    background: rgba(230, 238, 247, .5);
  }

  .page-faq .faq-nav__count {
    margin-left: auto;
  }

  .page-faq .faq-cat__title {
    font-size: 26px;
  }

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

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

  .page-faq .faq-flow {
    gap: 64px;
  }
}

@media (min-width: 1120px) {
  .page-faq .qa {
    padding-left: 36px;
  }

  .page-faq .qa__marker {
    left: 8px;
  }

  .page-faq .qa::before {
    left: 12px;
  }
}

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

  .page-faq .qa__marker,
  .page-faq .qa::before,
  .page-faq .qa-nav__item,
  .page-faq .faq-nav__item {
    transition: none;
  }
}
</final>

/* ============================================================
   PAGE: 使用教程 / tutorial  ( scope: .page-faq )
   ============================================================ */

.page-faq {
  --faq-rail: rgba(201, 162, 39, .30);
  --faq-rail-on: rgba(255, 107, 74, .65);
  --faq-line: rgba(11, 37, 69, .10);
  --faq-line-strong: rgba(11, 37, 69, .18);
  --faq-body-size: 16px;
  display: block;
}

/* ---------- breadcrumbs ---------- */

.page-faq .faq-crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- hero ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: 24px 0 48px;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% 40% 40%;
  background:
    radial-gradient(ellipse at 70% 30%, rgba(111, 211, 188, .22), transparent 62%),
    radial-gradient(ellipse at 30% 80%, rgba(18, 58, 99, .16), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

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

.page-faq .faq-hero h1 {
  margin: 14px 0 18px;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: .02em;
  font-weight: 700;
  color: var(--abyss);
}

.page-faq .faq-hero__lead {
  max-width: 46ch;
  font-size: var(--faq-body-size);
  line-height: 1.9;
  color: var(--grey);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero__stat-num {
  font-size: 20px;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-faq .faq-hero__stat-label {
  font-size: 14px;
  color: var(--grey);
}

.page-faq .faq-hero__media {
  position: relative;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-gold);
  background: var(--white);
  padding: 10px;
  box-shadow: 0 18px 44px rgba(11, 37, 69, .08);
}

.page-faq .faq-hero__media .media-frame__inner {
  overflow: hidden;
  border-radius: var(--radius-s);
  background: var(--shallow);
}

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

.page-faq .faq-hero__media .media-frame__caption {
  display: block;
  padding: 10px 4px 2px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--grey);
  font-family: var(--font-mono);
}

/* ---------- .page-faq layout ---------- */

.page-faq .page-faq__body {
  padding-top: 8px;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

/* ---------- left rail ---------- */

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

.page-faq .faq-aside__eyebrow {
  margin-bottom: 12px;
}

.page-faq .faq-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 12px;
  margin: 0;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-nav__item {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-m);
  background: var(--white);
  color: var(--abyss);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  transition:
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-faq .faq-nav__item:hover,
.page-faq .faq-nav__item:focus-visible {
  border-color: var(--coral);
  color: var(--abyss);
  background: rgba(255, 107, 74, .06);
}

.page-faq .faq-nav__item:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-faq .faq-nav__num {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-faq .faq-nav__label {
  font-weight: 700;
  letter-spacing: .02em;
}

.page-faq .faq-nav__count {
  font-size: 12px;
  color: var(--grey);
  border-left: 1px solid var(--faq-line);
  padding-left: 10px;
}

.page-faq .faq-aside__note {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- Q&A flow ---------- */

.page-faq .faq-flow {
  min-width: 0;
  display: grid;
  gap: 48px;
}

.page-faq .faq-cat {
  scroll-margin-top: 120px;
}

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

.page-faq .faq-cat__index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-s);
  background: linear-gradient(135deg, var(--abyss) 0%, var(--hull) 100%);
  color: var(--gold-lite);
  font-size: 14px;
  letter-spacing: .04em;
}

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

.page-faq .faq-cat__title {
  margin: 0;
  font-size: 22px;
  line-height: 1.34;
  letter-spacing: .02em;
  color: var(--abyss);
}

.page-faq .faq-cat__desc {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

.page-faq .faq-cat__list {
  margin-top: 4px;
}

/* ---------- single Q&A item ---------- */

.page-faq .qa {
  position: relative;
  padding-left: 30px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 34px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--faq-rail), transparent 88%);
  transition: background var(--dur) var(--ease);
  pointer-events: none;
}

.page-faq .qa[open]::before {
  background: linear-gradient(to bottom, var(--faq-rail-on), rgba(255, 107, 74, .08) 88%);
}

.page-faq .qa:last-child {
  border-bottom: none;
}

.page-faq .qa__summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 22px 0;
  cursor: pointer;
  list-style: none;
  color: var(--abyss);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .qa__summary:hover .qa__question {
  color: var(--hull);
}

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

.page-faq .qa__marker {
  position: absolute;
  left: 4px;
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--faq-line-strong);
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
  z-index: 1;
}

.page-faq .qa[open] .qa__marker {
  background: var(--coral);
  border-color: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, .16);
}

.page-faq .qa__question {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 16px;
  line-height: 1.72;
  font-weight: 700;
  letter-spacing: .01em;
  transition: color var(--dur) var(--ease);
}

.page-faq .qa__toggle {
  flex: 0 0 auto;
  align-self: flex-start;
  margin-left: auto;
  padding-top: 5px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--grey);
  transition: color var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__toggle {
  font-size: 0;
  color: var(--coral);
}

.page-faq .qa[open] .qa__toggle::after {
  content: "收起";
  font-size: 12px;
  letter-spacing: .06em;
}

.page-faq .qa__body {
  padding: 0 0 26px 0;
  font-size: var(--faq-body-size);
  line-height: 1.9;
  color: var(--grey);
  animation: faq-reveal var(--dur) var(--ease) both;
}

.page-faq .qa__body > p {
  margin: 0;
}

.page-faq .qa__body > p + p,
.page-faq .qa__body > p + ol,
.page-faq .qa__body > ol + p {
  margin-top: 14px;
}

.page-faq .qa__body strong {
  color: var(--abyss);
  font-weight: 700;
}

.page-faq .qa__note {
  margin-top: 14px;
  padding: 10px 14px;
  border-left: 2px solid var(--emerald);
  background: rgba(14, 124, 102, .06);
  font-size: 14px;
  line-height: 1.8;
  color: var(--hull);
}

/* ---------- numbered step list ---------- */

.page-faq .qa__steps {
  counter-reset: qa-step;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .qa__steps li {
  counter-increment: qa-step;
  position: relative;
  padding-left: 40px;
  min-height: 26px;
  font-size: var(--faq-body-size);
  line-height: 1.78;
  color: var(--grey);
}

.page-faq .qa__steps li::before {
  content: counter(qa-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(14, 124, 102, .34);
  background: rgba(14, 124, 102, .08);
  color: var(--emerald);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
  line-height: 1;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- inline figure between categories ---------- */

.page-faq .faq-inline-media {
  margin: 0;
  padding: 0;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-gold);
  background:
    linear-gradient(135deg, rgba(230, 238, 247, .9) 0%, rgba(250, 251, 252, 1) 70%);
  overflow: hidden;
}

.page-faq .faq-inline-media .media-frame__inner {
  overflow: hidden;
}

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

.page-faq .faq-inline-media .media-frame__caption {
  display: block;
  padding: 12px 18px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--grey);
  border-top: 1px solid var(--faq-line);
}

/* ---------- closing call ---------- */

.page-faq .faq-next {
  padding-bottom: 72px;
}

.page-faq .faq-next__panel {
  position: relative;
  overflow: hidden;
  padding: 36px 28px;
  border-radius: var(--radius-m);
  background:
    radial-gradient(ellipse at 100% 0%, rgba(201, 162, 39, .28), transparent 55%),
    radial-gradient(ellipse at 0% 100%, rgba(14, 124, 102, .34), transparent 55%),
    linear-gradient(140deg, var(--abyss) 0%, var(--hull) 100%);
  color: var(--text-on-dark);
  display: grid;
  gap: 24px;
}

.page-faq .faq-next__panel::after {
  content: "";
  position: absolute;
  top: 18px;
  right: 18px;
  width: 56px;
  height: 56px;
  border-top: 1px solid var(--line-gold);
  border-right: 1px solid var(--line-gold);
  border-top-right-radius: var(--radius-s);
  pointer-events: none;
}

.page-faq .faq-next__eyebrow {
  color: var(--gold-lite);
  margin-bottom: 10px;
}

.page-faq .faq-next__text h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--white);
}

.page-faq .faq-next__text p {
  margin-top: 12px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-on-dark);
}

.page-faq .faq-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: end;
}

/* ============================================================
   responsive
   ============================================================ */

@media (min-width: 720px) {
  .page-faq .faq-hero h1 {
    font-size: 34px;
  }

  .page-faq .faq-next__panel {
    padding: 44px 40px;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 36px 0 64px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: center;
  }

  .page-faq .faq-hero h1 {
    font-size: 40px;
    line-height: 1.24;
  }

  .page-faq .faq-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 104px;
    align-self: start;
    padding-right: 8px;
    border-right: 1px solid var(--faq-line);
  }

  .page-faq .faq-nav {
    flex-direction: column;
    overflow: visible;
    padding: 0;
    gap: 2px;
  }

  .page-faq .faq-nav__item {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 12px;
    border-color: transparent;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-s) var(--radius-s) 0;
    background: transparent;
    white-space: normal;
  }

  .page-faq .faq-nav__item:hover,
  .page-faq .faq-nav__item:focus-visible {
    border-left-color: var(--coral);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
    background: rgba(230, 238, 247, .5);
  }

  .page-faq .faq-nav__count {
    margin-left: auto;
  }

  .page-faq .faq-cat__title {
    font-size: 26px;
  }

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

  .page-faq .faq-flow {
    gap: 64px;
  }
}

@media (min-width: 1120px) {
  .page-faq .qa {
    padding-left: 36px;
  }

  .page-faq .qa__marker {
    left: 8px;
  }

  .page-faq .qa::before {
    left: 12px;
  }
}

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

  .page-faq .qa__marker,
  .page-faq .qa::before,
  .page-faq .faq-nav__item {
    transition: none;
  }
}

/* ============================================================
   PAGE: 使用教程 / tutorial  ( scope: .page-faq )
   ============================================================ */

.page-faq {
  --faq-rail: rgba(201, 162, 39, .30);
  --faq-rail-on: rgba(255, 107, 74, .65);
  --faq-line: rgba(11, 37, 69, .10);
  --faq-line-strong: rgba(11, 37, 69, .18);
  --faq-body-size: 16px;
  display: block;
}

/* ---------- breadcrumbs ---------- */

.page-faq .faq-crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- hero ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: 24px 0 48px;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% 40% 40%;
  background:
    radial-gradient(ellipse at 70% 30%, rgba(111, 211, 188, .22), transparent 62%),
    radial-gradient(ellipse at 30% 80%, rgba(18, 58, 99, .16), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

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

.page-faq .faq-hero h1 {
  margin: 14px 0 18px;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: .02em;
  font-weight: 700;
  color: var(--abyss);
}

.page-faq .faq-hero__lead {
  max-width: 46ch;
  font-size: var(--faq-body-size);
  line-height: 1.9;
  color: var(--grey);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-hero__stat-num {
  font-size: 20px;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-faq .faq-hero__stat-label {
  font-size: 14px;
  color: var(--grey);
}

.page-faq .faq-hero__media {
  position: relative;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-gold);
  background: var(--white);
  padding: 10px;
  box-shadow: 0 18px 44px rgba(11, 37, 69, .08);
}

.page-faq .faq-hero__media .media-frame__inner {
  overflow: hidden;
  border-radius: var(--radius-s);
  background: var(--shallow);
}

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

.page-faq .faq-hero__media .media-frame__caption {
  display: block;
  padding: 10px 4px 2px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--grey);
  font-family: var(--font-mono);
}

/* ---------- .page-faq layout ---------- */

.page-faq .page-faq__body {
  padding-top: 8px;
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

/* ---------- left rail ---------- */

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

.page-faq .faq-aside__eyebrow {
  margin-bottom: 12px;
}

.page-faq .faq-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 12px;
  margin: 0;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-nav__item {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-m);
  background: var(--white);
  color: var(--abyss);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  transition:
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-faq .faq-nav__item:hover,
.page-faq .faq-nav__item:focus-visible {
  border-color: var(--coral);
  color: var(--abyss);
  background: rgba(255, 107, 74, .06);
}

.page-faq .faq-nav__item:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 2px;
}

.page-faq .faq-nav__num {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-faq .faq-nav__label {
  font-weight: 700;
  letter-spacing: .02em;
}

.page-faq .faq-nav__count {
  font-size: 12px;
  color: var(--grey);
  border-left: 1px solid var(--faq-line);
  padding-left: 10px;
}

.page-faq .faq-aside__note {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- Q&A flow ---------- */

.page-faq .faq-flow {
  min-width: 0;
  display: grid;
  gap: 48px;
}

.page-faq .faq-cat {
  scroll-margin-top: 120px;
}

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

.page-faq .faq-cat__index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-s);
  background: linear-gradient(135deg, var(--abyss) 0%, var(--hull) 100%);
  color: var(--gold-lite);
  font-size: 14px;
  letter-spacing: .04em;
}

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

.page-faq .faq-cat__title {
  margin: 0;
  font-size: 22px;
  line-height: 1.34;
  letter-spacing: .02em;
  color: var(--abyss);
}

.page-faq .faq-cat__desc {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey);
}

.page-faq .faq-cat__list {
  margin-top: 4px;
}

/* ---------- single Q&A item ---------- */

.page-faq .qa {
  position: relative;
  padding-left: 30px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 34px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--faq-rail), transparent 88%);
  transition: background var(--dur) var(--ease);
  pointer-events: none;
}

.page-faq .qa[open]::before {
  background: linear-gradient(to bottom, var(--faq-rail-on), rgba(255, 107, 74, .08) 88%);
}

.page-faq .qa:last-child {
  border-bottom: none;
}

.page-faq .qa__summary {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 22px 0;
  cursor: pointer;
  list-style: none;
  color: var(--abyss);
  transition: color var(--dur) var(--ease);
}

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

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

.page-faq .qa__summary:hover .qa__question {
  color: var(--hull);
}

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

.page-faq .qa__marker {
  position: absolute;
  left: 4px;
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--faq-line-strong);
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
  z-index: 1;
}

.page-faq .qa[open] .qa__marker {
  background: var(--coral);
  border-color: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, .16);
}

.page-faq .qa__question {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 16px;
  line-height: 1.72;
  font-weight: 700;
  letter-spacing: .01em;
  transition: color var(--dur) var(--ease);
}

.page-faq .qa__toggle {
  flex: 0 0 auto;
  align-self: flex-start;
  margin-left: auto;
  padding-top: 5px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--grey);
  transition: color var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__toggle {
  font-size: 0;
  color: var(--coral);
}

.page-faq .qa[open] .qa__toggle::after {
  content: "收起";
  font-size: 12px;
  letter-spacing: .06em;
}

.page-faq .qa__body {
  padding: 0 0 26px 0;
  font-size: var(--faq-body-size);
  line-height: 1.9;
  color: var(--grey);
  animation: faq-reveal var(--dur) var(--ease) both;
}

.page-faq .qa__body > p {
  margin: 0;
}

.page-faq .qa__body > p + p,
.page-faq .qa__body > p + ol,
.page-faq .qa__body > ol + p {
  margin-top: 14px;
}

.page-faq .qa__body strong {
  color: var(--abyss);
  font-weight: 700;
}

.page-faq .qa__note {
  margin-top: 14px;
  padding: 10px 14px;
  border-left: 2px solid var(--emerald);
  background: rgba(14, 124, 102, .06);
  font-size: 14px;
  line-height: 1.8;
  color: var(--hull);
}

/* ---------- numbered step list ---------- */

.page-faq .qa__steps {
  counter-reset: qa-step;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .qa__steps li {
  counter-increment: qa-step;
  position: relative;
  padding-left: 40px;
  min-height: 26px;
  font-size: var(--faq-body-size);
  line-height: 1.78;
  color: var(--grey);
}

.page-faq .qa__steps li::before {
  content: counter(qa-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(14, 124, 102, .34);
  background: rgba(14, 124, 102, .08);
  color: var(--emerald);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
  line-height: 1;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- inline figure between categories ---------- */

.page-faq .faq-inline-media {
  margin: 0;
  padding: 0;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-gold);
  background:
    linear-gradient(135deg, rgba(230, 238, 247, .9) 0%, rgba(250, 251, 252, 1) 70%);
  overflow: hidden;
}

.page-faq .faq-inline-media .media-frame__inner {
  overflow: hidden;
}

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

.page-faq .faq-inline-media .media-frame__caption {
  display: block;
  padding: 12px 18px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--grey);
  border-top: 1px solid var(--faq-line);
}

/* ---------- closing call ---------- */

.page-faq .faq-next {
  padding-bottom: 72px;
}

.page-faq .faq-next__panel {
  position: relative;
  overflow: hidden;
  padding: 36px 28px;
  border-radius: var(--radius-m);
  background:
    radial-gradient(ellipse at 100% 0%, rgba(201, 162, 39, .28), transparent 55%),
    radial-gradient(ellipse at 0% 100%, rgba(14, 124, 102, .34), transparent 55%),
    linear-gradient(140deg, var(--abyss) 0%, var(--hull) 100%);
  color: var(--text-on-dark);
  display: grid;
  gap: 24px;
}

.page-faq .faq-next__panel::after {
  content: "";
  position: absolute;
  top: 18px;
  right: 18px;
  width: 56px;
  height: 56px;
  border-top: 1px solid var(--line-gold);
  border-right: 1px solid var(--line-gold);
  border-top-right-radius: var(--radius-s);
  pointer-events: none;
}

.page-faq .faq-next__eyebrow {
  color: var(--gold-lite);
  margin-bottom: 10px;
}

.page-faq .faq-next__text h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--white);
}

.page-faq .faq-next__text p {
  margin-top: 12px;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-on-dark);
}

.page-faq .faq-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-self: end;
}

/* ============================================================
   responsive
   ============================================================ */

@media (min-width: 720px) {
  .page-faq .faq-hero h1 {
    font-size: 34px;
  }

  .page-faq .faq-next__panel {
    padding: 44px 40px;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 36px 0 64px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: center;
  }

  .page-faq .faq-hero h1 {
    font-size: 40px;
    line-height: 1.24;
  }

  .page-faq .faq-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-aside {
    position: sticky;
    top: 104px;
    align-self: start;
    padding-right: 8px;
    border-right: 1px solid var(--faq-line);
  }

  .page-faq .faq-nav {
    flex-direction: column;
    overflow: visible;
    padding: 0;
    gap: 2px;
  }

  .page-faq .faq-nav__item {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 12px;
    border-color: transparent;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-s) var(--radius-s) 0;
    background: transparent;
    white-space: normal;
  }

  .page-faq .faq-nav__item:hover,
  .page-faq .faq-nav__item:focus-visible {
    border-left-color: var(--coral);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
    background: rgba(230, 238, 247, .5);
  }

  .page-faq .faq-nav__count {
    margin-left: auto;
  }

  .page-faq .faq-cat__title {
    font-size: 26px;
  }

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

  .page-faq .faq-flow {
    gap: 64px;
  }
}

@media (min-width: 1120px) {
  .page-faq .qa {
    padding-left: 36px;
  }

  .page-faq .qa__marker {
    left: 8px;
  }

  .page-faq .qa::before {
    left: 12px;
  }
}

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

  .page-faq .qa__marker,
  .page-faq .qa::before,
  .page-faq .faq-nav__item {
    transition: none;
  }
}