.page-faq {
  --faq-gap: clamp(16px, 3vw, 28px);
  --faq-sticky: calc(var(--topbar) + 20px);
  color: var(--text);
}

.page-faq .container {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.page-faq .breadcrumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-faq .tut-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(26px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.page-faq .tut-hero .display {
  font-size: clamp(30px, 5.4vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 12px 0 18px;
  max-width: 18em;
  color: var(--text);
}

.page-faq .tut-hero .lede {
  max-width: 42em;
  margin: 0 0 22px;
  color: var(--text-dim);
  line-height: 1.8;
}

.page-faq .tut-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-gold);
}

.page-faq .tut-meta li {
  padding-right: 14px;
  margin-right: 14px;
  border-right: 1px solid var(--line);
}

.page-faq .tut-meta li:last-child {
  border-right: 0;
  padding-right: 0;
  margin-right: 0;
}

/* ---------- 四步任务条 ---------- */
.page-faq .tut-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: clamp(24px, 4vw, 40px) 0 0;
  list-style: none;
  background: var(--line-soft);
}

.page-faq .tut-step {
  background: var(--bg);
}

.page-faq .tut-step-link {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num title"
    "num text";
  align-items: start;
  gap: 4px 14px;
  padding: 18px 18px 18px 16px;
  text-decoration: none;
  color: var(--text);
  border-left: 2px solid transparent;
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-faq .tut-step-link:hover,
.page-faq .tut-step-link:focus-visible {
  background: var(--surface);
  border-left-color: var(--c-red-lit);
}

.page-faq .tut-step-num {
  grid-area: num;
  font-size: 22px;
  line-height: 1;
  color: var(--c-gold);
}

.page-faq .tut-step-title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
}

.page-faq .tut-step-text {
  grid-area: text;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 首屏信息图 ---------- */
.page-faq .tut-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

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

.page-faq .tut-figure--inline {
  margin: 0 0 8px;
}

/* ---------- 双栏 ---------- */
.page-faq .tut-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 40px);
  padding: clamp(32px, 5vw, 64px) 0 clamp(48px, 6vw, 88px);
}

.page-faq .tut-index {
  align-self: start;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 20px 18px;
}

.page-faq .tut-index-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-faq .tut-index-list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-faq .tut-index-list li + li {
  border-top: 1px solid var(--line-soft);
}

.page-faq .tut-index-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  color: var(--text);
  font-size: 14px;
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-faq .tut-index-list a:hover,
.page-faq .tut-index-list a:focus-visible {
  color: var(--c-turq-lit);
}

.page-faq .tut-index-list .mono {
  font-size: 11px;
  color: var(--c-gold);
  min-width: 20px;
}

.page-faq .tut-index-help {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-faq .tut-index-help p {
  margin: 0 0 10px;
}

.page-faq .tut-index-help-title {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-turq-lit);
}

.page-faq .tut-index-help a {
  color: var(--c-gold-lit);
  word-break: break-all;
}

/* ---------- 章节 ---------- */
.page-faq .tut-section {
  padding-top: clamp(28px, 4vw, 44px);
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-faq .tut-section:first-child {
  padding-top: 0;
  margin-top: 0;
  border-top: 0;
}

.page-faq .tut-section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-faq .tut-section-num {
  font-size: 13px;
  color: var(--c-gold);
  letter-spacing: 0.08em;
  flex: none;
}

.page-faq .tut-section .h2 {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.35;
  color: var(--text);
}

.page-faq .tut-section .prose {
  max-width: 42em;
  margin: 0 0 22px;
  color: var(--text-dim);
  line-height: 1.8;
}

.page-faq .prose a,
.page-faq .tut-answer a,
.page-faq .tut-tail a {
  color: var(--c-gold-lit);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 步骤列表 ---------- */
.page-faq .tut-flow {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-faq .tut-flow li {
  background: var(--bg);
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-faq .tut-flow .mono {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-turq-lit);
  margin-bottom: 4px;
}

.page-faq .tut-flow strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 2px;
}

/* ---------- 折叠问题 ---------- */
.page-faq .tut-item {
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .tut-item:first-of-type {
  border-top: 1px solid var(--line-soft);
}

.page-faq .tut-item summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  transition: color 180ms var(--ease);
}

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

.page-faq .tut-item summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-gold);
  transition: color 180ms var(--ease);
}

.page-faq .tut-item[open] summary::after {
  content: "−";
  color: var(--c-red-lit);
}

.page-faq .tut-item summary:hover,
.page-faq .tut-item summary:focus-visible {
  color: var(--c-gold-lit);
}

.page-faq .tut-q-num {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
  min-width: 22px;
}

.page-faq .tut-q {
  flex: 1 1 auto;
}

.page-faq .tut-answer {
  border-left: 2px solid var(--c-gold);
  background: var(--surface);
  padding: 16px 18px;
  margin: 0 0 16px 36px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .tut-answer p {
  margin: 0 0 10px;
}

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

.page-faq .tut-list {
  margin: 0 0 10px;
  padding-left: 0;
  list-style: none;
}

.page-faq .tut-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 6px;
}

.page-faq .tut-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--c-turq-lit);
}

/* ---------- 产品线说明 ---------- */
.page-faq .tut-lines {
  display: grid;
  gap: 1px;
  margin: 0 0 24px;
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-faq .tut-line {
  background: var(--bg);
  padding: 14px 16px;
}

.page-faq .tut-line p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-faq .tut-line-k {
  color: var(--c-gold) !important;
  font-size: 12px !important;
  letter-spacing: 0.1em;
  margin-bottom: 4px !important;
}

/* ---------- 收尾 ---------- */
.page-faq .tut-tail {
  margin-top: clamp(32px, 4vw, 52px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line);
  background:
    linear-gradient(150deg, rgba(199, 53, 44, 0.14) 0%, rgba(11, 20, 48, 0) 46%),
    var(--surface);
}

.page-faq .tut-tail .h3 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--text);
}

.page-faq .tut-tail > p {
  max-width: 40em;
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-faq .tut-tail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.page-faq .tut-contact {
  display: grid;
  gap: 12px;
  margin: 0 0 16px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-faq .tut-contact dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-turq-lit);
  margin-bottom: 3px;
}

.page-faq .tut-contact dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.page-faq .tut-tail-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-faq .tut-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .tut-flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .tut-lines {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .tut-contact {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 1000px) {
  .page-faq .tut-steps {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .tut-flow--four {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .tut-layout {
    grid-template-columns: 252px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-faq .tut-index {
    position: sticky;
    top: var(--faq-sticky);
  }

  .page-faq .tut-item summary {
    padding: 18px 0;
    font-size: 16px;
  }

  .page-faq .tut-answer {
    font-size: 15px;
  }

  .page-faq .tut-contact {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .tut-step-link,
  .page-faq .tut-index-list a,
  .page-faq .tut-item summary,
  .page-faq .tut-item summary::after {
    transition: none;
  }
}
</main>