/* ===== 使用教程 /tutorial/ ===== */
.page-faq {
  --faq-read: 66ch;
  --faq-num: clamp(38px, 6.2vw, 74px);
  display: block;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 7vw, 104px);
}

.page-faq .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 18px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-dim);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(34px, 5vw, 66px) 0 clamp(34px, 5vw, 62px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.13;
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--odds), var(--hot) 40%, transparent 76%);
  opacity: 0.85;
  pointer-events: none;
}

.page-faq .faq-hero .container {
  position: relative;
  z-index: 2;
}

.page-faq .faq-hero-mark {
  position: absolute;
  right: -3%;
  bottom: -22%;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: clamp(150px, 24vw, 320px);
  line-height: 0.8;
  font-weight: 700;
  letter-spacing: -0.06em;
  color: transparent;
  -webkit-text-stroke: 1px var(--line);
  pointer-events: none;
  user-select: none;
}

.page-faq .faq-hero-title {
  margin: 14px 0 0;
  max-width: 15ch;
  font-family: var(--font-display);
  font-size: clamp(32px, 6.2vw, 72px);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero-lead {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-hero-stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist-dim);
}

.page-faq .faq-hero-stats .mono {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 布局 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  padding-top: clamp(30px, 4.6vw, 60px);
}

.page-faq .faq-toc {
  position: relative;
  min-width: 0;
}

.page-faq .faq-toc-label {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist-dim);
}

.page-faq .faq-toc-list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-toc-list li {
  flex: 0 0 auto;
}

.page-faq .faq-toc-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-faq .faq-toc-list a:hover,
.page-faq .faq-toc-list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-faq .faq-toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-toc-list a:hover .faq-toc-num,
.page-faq .faq-toc-list a:focus-visible .faq-toc-num {
  color: var(--odds);
}

.page-faq .faq-body {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  min-width: 0;
}

/* ---------- 步骤卡 ---------- */
.page-faq .faq-step {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-800);
  padding: clamp(20px, 2.6vw, 34px);
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: border-color 0.3s var(--ease);
}

.page-faq .faq-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(51, 239, 210, 0.14) 68%, transparent 100%);
  pointer-events: none;
}

.page-faq .faq-step:target {
  border-color: var(--cyan);
}

.page-faq .faq-step-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: 16px;
}

.page-faq .faq-step-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--faq-num);
  font-weight: 700;
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-step-title {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  padding-top: 2px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.8vw, 33px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: 0.005em;
  color: var(--paper);
}

.page-faq .faq-step-body {
  max-width: var(--faq-read);
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-faq .faq-step-body p {
  margin: 0 0 14px;
}

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

.page-faq .faq-step-body strong {
  color: var(--paper);
  font-weight: 600;
}

/* ---------- 操作步骤列表 ---------- */
.page-faq .faq-actions {
  list-style: none;
  counter-reset: faqact;
  margin: 20px 0 18px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-actions > li {
  counter-increment: faqact;
  position: relative;
  padding-left: 44px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--paper);
}

.page-faq .faq-actions > li::before {
  content: counter(faqact, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  width: 30px;
  height: 22px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: 2px;
  font-variant-numeric: tabular-nums;
}

/* ---------- 折叠说明 ---------- */
.page-faq .faq-more {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(10, 26, 40, 0.55);
}

.page-faq .faq-more > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--cyan-soft);
  transition: color 0.25s var(--ease);
}

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

.page-faq .faq-more > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-more[open] > summary {
  color: var(--cyan);
}

.page-faq .faq-more[open] > summary::after {
  content: "–";
}

.page-faq .faq-more > summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .faq-more-body {
  padding: 0 16px 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-more-body p {
  margin: 0;
}

.page-faq .faq-more-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 239, 210, 0.4);
}

.page-faq .faq-more-body a:hover,
.page-faq .faq-more-body a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 24px 0 0;
  padding: 0;
}

.page-faq .faq-shot {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-900);
  aspect-ratio: 3 / 2;
}

.page-faq .faq-shot--wide {
  aspect-ratio: 2 / 1;
}

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

.page-faq .faq-figure figcaption {
  margin-top: 10px;
}

/* ---------- 纸张区块 ---------- */
.page-faq .faq-step--paper {
  background: var(--paper);
  border-color: var(--paper-line);
  color: var(--ink-text);
}

.page-faq .faq-step--paper::before {
  background: linear-gradient(180deg, var(--ink-800) 0%, rgba(18, 43, 65, 0.16) 68%, transparent 100%);
}

.page-faq .faq-step--paper .faq-step-num {
  color: var(--ink-800);
}

.page-faq .faq-step--paper .faq-step-title {
  color: var(--ink-text);
}

.page-faq .faq-step--paper .faq-step-body {
  color: #44566a;
}

/* ---------- 字段表 ---------- */
.page-faq .faq-fields {
  margin: 22px 0 0;
  border-top: 1px solid var(--paper-line);
}

.page-faq .faq-field {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--paper-line);
}

.page-faq .faq-field dt {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-800);
}

.page-faq .faq-field dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #44566a;
}

/* ---------- 两种读法 ---------- */
.page-faq .faq-ways {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.page-faq .faq-way {
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 16px 18px;
  background: rgba(10, 26, 40, 0.45);
}

.page-faq .faq-way h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-faq .faq-way p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 提交渠道 ---------- */
.page-faq .faq-channels {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-channels > li {
  position: relative;
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.page-faq .faq-channel-tag {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

.page-faq .faq-channels p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper);
}

.page-faq .faq-channels .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-faq .faq-mail {
  font-family: var(--font-mono);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 239, 210, 0.45);
  word-break: break-all;
}

.page-faq .faq-mail:hover,
.page-faq .faq-mail:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-field {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-faq .faq-ways {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-layout {
    grid-template-columns: 206px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-faq .faq-toc-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-faq .faq-toc-list a {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 10px 0 10px 14px;
    white-space: normal;
    line-height: 1.5;
    font-size: 14px;
  }

  .page-faq .faq-toc-list a:hover,
  .page-faq .faq-toc-list a:focus-visible {
    border-left-color: var(--cyan);
  }

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

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 520px) {
  .page-faq .faq-step-head {
    flex-direction: column;
    gap: 10px;
  }

  .page-faq .faq-step-num {
    font-size: 40px;
  }

  .page-faq .faq-step-title {
    font-size: 21px;
  }

  .page-faq .faq-actions > li {
    padding-left: 38px;
    font-size: 15px;
  }

  .page-faq .faq-hero-stats {
    gap: 10px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-toc-list a,
  .page-faq .faq-more > summary {
    transition: none;
  }
}