/* ============ 使用教程页 · page-faq ============ */

.page-faq {
  --faq-num-w: 40px;
  --faq-gap: 14px;
  --faq-cut: 18px;
  padding-bottom: 72px;
}

/* ---------- 页头区 ---------- */

.page-faq .faq-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 26px;
  font-family: var(--mono);
  font-size: var(--f-2xs);
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-faq .faq-breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-breadcrumb a:hover,
.page-faq .faq-breadcrumb a:focus-visible {
  color: var(--gold-400);
  border-bottom-color: var(--gold-400);
}

.page-faq .faq-breadcrumb .sep {
  color: var(--slate-600);
}

.page-faq .faq-breadcrumb [aria-current] {
  color: var(--gold-400);
}

.page-faq .faq-mast-grid {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-faq .faq-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: var(--f-2xs);
  letter-spacing: 0.16em;
  color: var(--gold-400);
}

.page-faq .faq-eyebrow::before {
  content: "";
  flex: none;
  width: 26px;
  height: 2px;
  background: var(--vermilion-500);
  transform: skewX(-12deg);
}

.page-faq .faq-h1 {
  margin: 0 0 18px;
  font-size: var(--f-3xl);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.page-faq .faq-h1-serif {
  display: block;
  margin-top: 12px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 0.56em;
  line-height: 1.45;
  letter-spacing: 0.01em;
  color: var(--text-muted);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 46rem;
  font-size: var(--f-sm);
  line-height: 1.8;
  color: var(--text-muted);
}

/* 版本信息块 */

.page-faq .faq-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line-400);
  border: 1px solid var(--line-400);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.page-faq .faq-fact {
  background: var(--ink-800);
  padding: 14px 16px 16px;
}

.page-faq .faq-fact dt {
  margin-bottom: 6px;
  font-size: var(--f-2xs);
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.page-faq .faq-fact dd {
  margin: 0;
  font-family: var(--mono);
  font-size: var(--f-md);
  font-weight: 500;
  line-height: 1.1;
  color: var(--gold-400);
}

/* 步骤索引条 */

.page-faq .faq-indexbar {
  display: flex;
  margin-top: 34px;
  border-top: 1px solid var(--line-400);
  border-bottom: 1px solid var(--line-400);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
}

.page-faq .faq-indexbar a {
  flex: none;
  padding: 12px 16px;
  font-family: var(--mono);
  font-size: var(--f-2xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--text-muted);
  text-decoration: none;
  border-right: 1px solid var(--line-400);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-indexbar a:first-child {
  border-left: 1px solid var(--line-400);
}

.page-faq .faq-indexbar a:hover,
.page-faq .faq-indexbar a:focus-visible {
  color: var(--ink-950);
  background: var(--gold-400);
}

/* ---------- 通用区块 ---------- */

.page-faq .faq-section {
  padding: 52px 0;
  border-bottom: 1px solid var(--line-400);
}

.page-faq .faq-section--last {
  border-bottom: none;
  padding-bottom: 8px;
}

.page-faq .faq-sec-head {
  display: grid;
  gap: 12px;
  max-width: 44rem;
  margin-bottom: 30px;
}

.page-faq .faq-sec-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-size: var(--f-2xs);
  letter-spacing: 0.14em;
  color: var(--gold-400);
}

.page-faq .faq-sec-mark .mono {
  font-family: var(--mono);
  font-size: var(--f-sm);
  font-weight: 500;
  letter-spacing: 0;
  color: var(--vermilion-500);
}

.page-faq .faq-sec-slash {
  width: 20px;
  height: 2px;
  background: var(--gold-600);
  transform: skewX(-12deg);
}

.page-faq .faq-sec-title {
  margin: 0;
  font-size: var(--f-xl);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.page-faq .faq-sec-sub {
  margin: 0;
  font-size: var(--f-sm);
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 01 自查起点 ---------- */

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

.page-faq .faq-start-card {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line-400);
  border-left: 3px solid var(--vermilion-500);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.page-faq .faq-start-card--alt {
  border-left-color: var(--gold-400);
}

.page-faq .faq-start-key {
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: var(--f-2xs);
  letter-spacing: 0.18em;
  color: var(--gold-600);
}

.page-faq .faq-start-card h3 {
  margin: 0 0 10px;
  font-size: var(--f-md);
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
}

.page-faq .faq-start-card p {
  margin: 0 0 14px;
  font-size: var(--f-sm);
  line-height: 1.75;
  color: var(--text-muted);
}

.page-faq .faq-inline-link {
  display: inline-block;
  font-size: var(--f-xs);
  letter-spacing: 0.06em;
  color: var(--gold-400);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-600);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  color: var(--vermilion-500);
  border-bottom-color: var(--vermilion-500);
}

/* ---------- 02 逐项对照 ---------- */

.page-faq .faq-steps-area {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-faq .faq-steps {
  display: grid;
  border-top: 1px solid var(--line-400);
  min-width: 0;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: var(--faq-num-w) minmax(0, 1fr);
  column-gap: var(--faq-gap);
  row-gap: 10px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-400);
}

.page-faq .faq-step > summary {
  grid-column: 1 / -1;
  display: flex;
  align-items: baseline;
  gap: var(--faq-gap);
  position: relative;
  padding-right: 26px;
  list-style: none;
  cursor: pointer;
}

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

.page-faq .faq-step > summary:focus-visible {
  outline: 2px solid var(--vermilion-500);
  outline-offset: 4px;
}

.page-faq .faq-step-num {
  flex: 0 0 var(--faq-num-w);
  font-family: var(--mono);
  font-size: var(--f-lg);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-400);
}

.page-faq .faq-step-title {
  font-size: var(--f-md);
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-step > summary:hover .faq-step-title {
  color: var(--gold-400);
}

.page-faq .faq-step-caret {
  position: absolute;
  right: 2px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--gold-600);
  border-bottom: 1.5px solid var(--gold-600);
  transform: rotate(45deg);
  transition: transform 0.24s var(--ease);
}

.page-faq .faq-step[open] .faq-step-caret {
  transform: rotate(-135deg);
}

.page-faq .faq-step-body {
  grid-column: 1 / -1;
  margin: 0;
  font-size: var(--f-sm);
  line-height: 1.78;
  color: var(--text-muted);
}

.page-faq .faq-step-note {
  grid-column: 1 / -1;
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-400);
}

.page-faq .faq-note-label {
  display: block;
  margin-bottom: 4px;
  font-size: var(--f-2xs);
  letter-spacing: 0.12em;
  color: var(--gold-600);
}

.page-faq .faq-step-note p {
  margin: 0;
  font-size: var(--f-xs);
  line-height: 1.6;
  color: var(--text-muted);
}

/* 对照参照图 */

.page-faq .faq-steps-fig {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-steps-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--line-400);
  background: var(--ink-800);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.page-faq .faq-steps-fig figcaption {
  font-size: var(--f-xs);
  line-height: 1.65;
  color: var(--text-muted);
  border-top: 1px solid var(--line-400);
  padding-top: 10px;
}

/* ---------- 03 标签读法 ---------- */

.page-faq .faq-level {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-400);
  background: var(--ink-800);
}

.page-faq .faq-level-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  pointer-events: none;
}

.page-faq .faq-level::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(7, 26, 47, 0.72) 0%,
    rgba(7, 26, 47, 0.9) 48%,
    var(--ink-900) 100%
  );
}

.page-faq .faq-level-inner {
  position: relative;
  z-index: 1;
  padding-top: 52px;
  padding-bottom: 52px;
}

.page-faq .faq-level-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .faq-level-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 12px 16px;
  background: rgba(12, 36, 64, 0.82);
  border: 1px solid var(--line-400);
  border-left: 3px solid var(--vermilion-500);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-faq .faq-level-item--l2 {
  margin-left: 24px;
  border-left-color: var(--gold-400);
  background: rgba(12, 36, 64, 0.66);
}

.page-faq .faq-level-item--l3 {
  margin-left: 48px;
  border-left-color: var(--gold-600);
  background: rgba(5, 19, 31, 0.6);
}

.page-faq .faq-level-name {
  font-size: var(--f-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.page-faq .faq-level-tag {
  font-family: var(--mono);
  font-size: var(--f-2xs);
  letter-spacing: 0.06em;
  color: var(--gold-400);
  white-space: nowrap;
}

.page-faq .faq-level-notes {
  display: grid;
  gap: 14px;
  max-width: 46rem;
}

.page-faq .faq-level-notes p {
  margin: 0;
  font-size: var(--f-sm);
  line-height: 1.78;
  color: var(--text-primary);
}

.page-faq .faq-level-notes p + p {
  padding-top: 14px;
  border-top: 1px solid var(--line-400);
  color: var(--text-muted);
}

/* ---------- 04 分类答疑 ---------- */

.page-faq .faq-groups {
  display: grid;
  gap: 1px;
  background: var(--line-400);
  border: 1px solid var(--line-400);
}

.page-faq .faq-group {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 22px 20px;
  background: var(--ink-900);
}

.page-faq .faq-group-key {
  font-family: var(--mono);
  font-size: var(--f-2xs);
  letter-spacing: 0.2em;
  color: var(--vermilion-500);
}

.page-faq .faq-group h3 {
  margin: 0;
  font-size: var(--f-sm);
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-primary);
}

.page-faq .faq-group > p {
  margin: 0;
  font-size: var(--f-xs);
  line-height: 1.75;
  color: var(--text-muted);
}

.page-faq .faq-basis {
  display: grid;
  gap: 4px;
  margin-top: 2px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-400);
  font-size: var(--f-xs);
  line-height: 1.7;
  color: var(--text-primary);
}

.page-faq .faq-basis-label {
  font-size: var(--f-2xs);
  letter-spacing: 0.12em;
  color: var(--gold-400);
}

/* ---------- 05 邮件自查 ---------- */

.page-faq .faq-mail-grid {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-faq .faq-mail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--line-400);
  counter-reset: none;
}

.page-faq .faq-mail-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-400);
  font-size: var(--f-sm);
  line-height: 1.72;
  color: var(--text-muted);
}

.page-faq .faq-mail-list li .mono {
  font-family: var(--mono);
  font-size: var(--f-xs);
  letter-spacing: 0.04em;
  color: var(--gold-400);
  padding-top: 3px;
}

.page-faq .faq-contact-card {
  padding: 24px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line-400);
  border-left: 3px solid var(--vermilion-500);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.page-faq .faq-contact-title {
  margin: 0 0 16px;
  font-size: var(--f-2xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--gold-400);
}

.page-faq .faq-contact-list {
  margin: 0 0 16px;
  display: grid;
  gap: 12px;
}

.page-faq .faq-contact-list > div {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-400);
}

.page-faq .faq-contact-list > div:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-faq .faq-contact-list dt {
  font-size: var(--f-2xs);
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.page-faq .faq-contact-list dd {
  margin: 0;
  font-family: var(--mono);
  font-size: var(--f-xs);
  line-height: 1.6;
  color: var(--text-primary);
  word-break: break-word;
}

.page-faq .faq-contact-note {
  margin: 0 0 18px;
  font-size: var(--f-xs);
  line-height: 1.72;
  color: var(--text-muted);
}

.page-faq .faq-contact-btn {
  display: inline-block;
}

.page-faq .faq-tail {
  margin: 34px 0 0;
  max-width: 46rem;
  padding-top: 18px;
  border-top: 2px solid var(--vermilion-500);
  font-size: var(--f-xs);
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 桌面端 ---------- */

@media (min-width: 720px) {
  .page-faq {
    --faq-num-w: 58px;
    --faq-gap: 20px;
  }

  .page-faq .faq-step-body {
    grid-column: 2;
  }

  .page-faq .faq-step-note {
    grid-column: 2;
    margin-top: 2px;
  }

  .page-faq .faq-start-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

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

  .page-faq .faq-section {
    padding: 66px 0;
  }

  .page-faq .faq-level-inner {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-mast-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
  }

  .page-faq .faq-steps-area {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 52px;
  }

  .page-faq .faq-steps-fig {
    position: sticky;
    top: calc(var(--header-space) + 24px);
  }

  .page-faq .faq-mail-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 44px;
  }

  .page-faq .faq-level-notes {
    max-width: 52rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step-caret,
  .page-faq .faq-step-title,
  .page-faq .faq-indexbar a,
  .page-faq .faq-breadcrumb a,
  .page-faq .faq-inline-link {
    transition: none;
  }
}
</main>