.page-faq {
  --faq-edge: 14px;
  --faq-line: var(--line);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-faq .tut-crumb {
  padding-top: clamp(16px, 2.6vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-faq .tut-hero {
  padding: clamp(24px, 4vw, 44px) 0 clamp(24px, 3.6vw, 40px);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .tut-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-3xl);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 17ch;
  overflow-wrap: break-word;
}

.page-faq .tut-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--mute);
  font-size: var(--fs-lg);
  line-height: 1.7;
}

.page-faq .tut-hero__meta {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--blue);
}

/* ---------- 四步轨道 ---------- */
.page-faq .tut-start {
  padding: clamp(28px, 4vw, 52px) 0;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .tut-h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-xl);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .step-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .step {
  position: relative;
  padding: 22px 18px 22px;
  background: var(--studio);
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, calc(100% - var(--faq-edge)) 0, 100% var(--faq-edge), 100% 100%, 0 100%);
  transition: transform var(--t), border-color var(--t);
}

.page-faq .step::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grass);
}

.page-faq .step:nth-child(2)::before { background: var(--sand); }
.page-faq .step:nth-child(3)::before { background: var(--signal); }
.page-faq .step:nth-child(4)::before { background: var(--blue); }

.page-faq .step__num {
  display: block;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-faq .step__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-lg);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .step__text {
  margin: 0;
  color: var(--mute);
  font-size: var(--fs-sm);
  line-height: 1.7;
}

@media (hover: hover) {
  .page-faq .step:hover {
    transform: translateY(-2px);
    border-color: var(--grass);
  }
}

.page-faq .tut-note {
  margin: 18px 0 0;
  max-width: 68ch;
  color: var(--mute);
  font-size: var(--fs-sm);
  line-height: 1.7;
}

.page-faq .tut-note a,
.page-faq .tut-support__line a,
.page-faq .qa__a a {
  color: var(--grass);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 正文双栏 ---------- */
.page-faq .tut-body {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding-block: clamp(28px, 4vw, 56px);
}

/* ---------- 目录 ---------- */
.page-faq .tut-toc {
  align-self: start;
  border: 1px solid var(--faq-line);
  background: var(--studio);
  padding: 16px 14px;
}

.page-faq .tut-toc__label {
  margin: 0 0 10px;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--blue);
}

.page-faq .tut-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .tut-toc__link {
  display: block;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--mute);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: color var(--t), background var(--t), border-color var(--t);
}

.page-faq .tut-toc__link:hover {
  color: var(--paper);
  background: rgba(46, 158, 99, 0.1);
}

.page-faq .tut-toc__link[aria-current="true"] {
  color: var(--paper);
  font-weight: 700;
  border-left-color: var(--signal);
  background: rgba(255, 90, 42, 0.12);
}

/* ---------- 章节 ---------- */
.page-faq .tut-sec {
  padding-bottom: clamp(26px, 3.6vw, 44px);
  margin-bottom: clamp(26px, 3.6vw, 44px);
  border-bottom: 1px solid var(--faq-line);
  scroll-margin-top: 100px;
}

.page-faq .tut-sec:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-faq .tut-sec__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .tut-sec__idx {
  padding: 3px 8px;
  border: 1px solid var(--faq-line);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-faq .tut-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-xl);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .tut-sec__lead {
  margin: 12px 0 20px;
  max-width: 64ch;
  color: var(--mute);
  font-size: var(--fs-sm);
  line-height: 1.75;
}

.page-faq .tut-sec__split {
  display: grid;
  gap: 18px;
}

/* ---------- 问答手风琴 ---------- */
.page-faq .qa {
  border: 1px solid var(--faq-line);
  background: var(--studio);
  margin-bottom: 10px;
  transition: border-color var(--t);
}

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

.page-faq .qa summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 14px 44px 14px 15px;
  font-size: var(--fs-body);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  transition: background var(--t);
}

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

.page-faq .qa summary::after {
  content: "+";
  position: absolute;
  top: 12px;
  right: 15px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.4;
  color: var(--grass);
}

.page-faq .qa[open] summary {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .qa[open] summary::after {
  content: "−";
  color: var(--signal);
}

@media (hover: hover) {
  .page-faq .qa summary:hover {
    background: rgba(46, 158, 99, 0.09);
  }
}

.page-faq .qa summary:focus-visible,
.page-faq .tut-toc__link:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-faq .qa__a {
  padding: 14px 15px 18px;
  color: var(--mute);
  font-size: var(--fs-sm);
  line-height: 1.75;
}

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

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

.page-faq .qa__steps {
  counter-reset: st;
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .qa__steps li {
  position: relative;
  padding-left: 32px;
}

.page-faq .qa__steps li::before {
  counter-increment: st;
  content: counter(st, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--sand);
}

.page-faq .qa__hint {
  margin: 0;
  padding: 10px 12px;
  border-left: 3px solid var(--signal);
  background: rgba(255, 90, 42, 0.08);
  color: var(--paper);
  font-size: var(--fs-sm);
}

/* ---------- 图 ---------- */
.page-faq .tut-fig {
  margin: 0;
  border: 1px solid var(--faq-line);
  background: var(--studio);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  overflow: hidden;
}

.page-faq .tut-fig--wide {
  margin-bottom: 18px;
}

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

.page-faq .tut-fig__cap {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--faq-line);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--blue);
}

/* ---------- 客服章节 ---------- */
.page-faq .tut-check {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .tut-check li {
  position: relative;
  padding-left: 26px;
  color: var(--mute);
  font-size: var(--fs-sm);
  line-height: 1.7;
}

.page-faq .tut-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 10px;
  height: 10px;
  background: var(--grass);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.page-faq .copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  padding: 16px;
  border: 1px solid var(--faq-line);
  background: var(--studio);
}

.page-faq .copy__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--blue);
}

.page-faq .copy__value {
  font-size: var(--fs-sm);
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-faq .copy__status {
  font-size: var(--fs-xs);
  color: var(--grass);
}

.page-faq .tut-support__line {
  margin: 16px 0 0;
  max-width: 66ch;
  color: var(--mute);
  font-size: var(--fs-sm);
  line-height: 1.75;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .step-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-faq .tut-body {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .tut-toc {
    position: sticky;
    top: 96px;
  }

  .page-faq .step-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1180px) {
  .page-faq .tut-hero__title {
    font-size: var(--fs-4xl);
  }

  .page-faq .tut-sec__split {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    align-items: start;
    gap: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step,
  .page-faq .qa,
  .page-faq .qa summary,
  .page-faq .tut-toc__link {
    transition: none;
  }

  .page-faq .step:hover {
    transform: none;
  }
}