/* ============================================================
   使用指南 /tutorial/ — .page-faq
   章节锚点 + 步骤卡 + 折叠问答
   ============================================================ */

.page-faq {
  --faq-rail: 236px;
  --faq-gap: clamp(1.75rem, 4vw, 3.5rem);
  display: block;
  background: var(--ink-deep);
  color: var(--paper);
  font-family: var(--font-sans);
}

/* ------------------ 首屏 ------------------ */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2rem, 5vw, 3.25rem);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, rgba(245, 242, 233, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(245, 242, 233, 0.045) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse 92% 82% at 78% 8%, #000 8%, transparent 72%);
  mask-image: radial-gradient(ellipse 92% 82% at 78% 8%, #000 8%, transparent 72%);
  pointer-events: none;
}

.page-faq .faq-hero .breadcrumb {
  margin-bottom: 1.1rem;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 0.7rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-faq .faq-hero h1 {
  margin: 0 0 1rem;
  max-width: 22ch;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 5.2vw, 3.4rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-hero .lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(0.9375rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: rgba(245, 242, 233, 0.78);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
  padding: 1rem 1rem 1.125rem;
  background: var(--ink-deep);
}

.page-faq .faq-hero__facts strong {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1;
  color: var(--gold);
}

.page-faq .faq-hero__facts span {
  font-size: 0.8125rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--lime);
}

/* ------------------ 主体两栏 ------------------ */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  align-items: start;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2rem, 5vw, 3.5rem);
}

.page-faq .faq-toc {
  position: relative;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-toc__title {
  margin: 0 0 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-faq .faq-toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.25rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .faq-toc__list li {
  flex: none;
}

.page-faq .faq-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--line);
  color: rgba(245, 242, 233, 0.82);
  font-size: 0.8125rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear,
    background-color var(--t-fast) linear;
}

.page-faq .faq-toc__list a:hover,
.page-faq .faq-toc__list a:focus-visible {
  color: var(--gold-light);
  border-color: rgba(201, 162, 39, 0.6);
  background: rgba(47, 107, 88, 0.28);
}

.page-faq .faq-toc__num {
  font-family: var(--font-serif);
  font-size: 0.8125rem;
  color: var(--gold);
}

/* ------------------ 章节骨架 ------------------ */

.page-faq .faq-section {
  padding-block: clamp(2rem, 5vw, 3.25rem);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 4.5rem;
}

.page-faq .faq-main > .faq-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-section .eyebrow {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-faq .faq-section .display-title {
  margin: 0.4rem 0 0.75rem;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-section .lede {
  margin: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(245, 242, 233, 0.75);
}

.page-faq .faq-section .prose {
  margin: 0 0 1rem;
  max-width: 64ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: rgba(245, 242, 233, 0.8);
}

.page-faq .faq-section .prose a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.45);
}

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

.page-faq .media-caption {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--lime);
}

/* ------------------ 01 步骤卡 ------------------ */

.page-faq .step-list {
  position: relative;
  display: grid;
  gap: clamp(1.25rem, 3vw, 1.75rem);
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .step-list::before {
  content: "";
  position: absolute;
  left: 1.375rem;
  top: 1.6rem;
  bottom: 1.6rem;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(201, 162, 39, 0.6) 0%,
    rgba(201, 162, 39, 0.08) 100%
  );
  pointer-events: none;
}

.page-faq .step-card {
  position: relative;
  padding: 0.25rem 0 0.25rem 3.75rem;
  min-height: 3.25rem;
}

.page-faq .step-card__num {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gold);
  background: var(--ink);
  border: 1px solid var(--line);
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear,
    background-color var(--t-fast) linear;
}

.page-faq .step-card:hover .step-card__num {
  color: var(--ink-deep);
  background: var(--gold);
  border-color: var(--gold);
}

.page-faq .step-card__title {
  margin: 0.35rem 0 0.5rem;
  font-family: var(--font-serif);
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-faq .step-card__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: rgba(245, 242, 233, 0.78);
}

.page-faq .step-card__body a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.45);
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear;
}

.page-faq .step-card__body a:hover {
  color: var(--paper);
  border-color: var(--paper);
}

.page-faq .faq-figure {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
}

/* ------------------ 02 索引说明 ------------------ */

.page-faq .index-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
  margin-top: clamp(1.5rem, 3.5vw, 2rem);
}

.page-faq .index-split__text .prose:first-child {
  margin-top: 0;
}

.page-faq .index-split__figure {
  margin: 0;
}

.page-faq .index-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-faq .index-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.25rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .index-key {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-faq .index-val {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(245, 242, 233, 0.82);
}

/* ------------------ 03 分类标签 ------------------ */

.page-faq .tag-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(1.5rem, 3.5vw, 2rem);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-faq .tag-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--ink-deep);
  transition: background-color var(--t-base) var(--ease);
}

.page-faq .tag-card:nth-child(even) {
  background: var(--ink);
}

.page-faq .tag-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: var(--cinnabar);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--t-base) var(--ease);
}

.page-faq .tag-card:hover {
  background: var(--celadon);
}

.page-faq .tag-card:hover::before {
  transform: scaleY(1);
}

.page-faq .tag-card__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .tag-card__text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: rgba(245, 242, 233, 0.76);
}

.page-faq .tag-card__scene {
  margin: 0;
  padding-top: 0.7rem;
  border-top: 1px dashed rgba(201, 162, 39, 0.25);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--lime);
}

.page-faq .tag-card__link {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 0.1rem;
  font-size: 0.8125rem;
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.45);
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear;
}

.page-faq .tag-card__link:hover {
  color: var(--paper);
  border-color: var(--paper);
}

/* ------------------ 04 折叠问答 ------------------ */

.page-faq .qa-list {
  display: grid;
  gap: 0.75rem;
  max-width: 46rem;
  margin-top: clamp(1.5rem, 3.5vw, 2rem);
}

.page-faq .qa-item {
  background: rgba(18, 54, 45, 0.42);
  border: 1px solid var(--line-soft);
  transition: border-color var(--t-fast) linear, background-color var(--t-base) var(--ease);
}

.page-faq .qa-item:hover {
  border-color: rgba(192, 57, 43, 0.45);
}

.page-faq .qa-item[open] {
  border-color: rgba(201, 162, 39, 0.45);
  background: rgba(30, 77, 64, 0.5);
}

.page-faq .qa-q {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color var(--t-fast) linear;
}

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

.page-faq .qa-q:hover {
  color: var(--gold-light);
}

.page-faq .qa-mark {
  position: relative;
  flex: none;
  width: 1.1rem;
  height: 1.1rem;
  transform: translateY(0.15rem);
}

.page-faq .qa-mark::before,
.page-faq .qa-mark::after {
  content: "";
  position: absolute;
  background: var(--cinnabar);
  transition: transform var(--t-base) var(--ease), opacity var(--t-fast) linear;
}

.page-faq .qa-mark::before {
  left: 0;
  top: 50%;
  width: 100%;
  height: 1.5px;
  transform: translateY(-50%);
}

.page-faq .qa-mark::after {
  top: 0;
  left: 50%;
  width: 1.5px;
  height: 100%;
  transform: translateX(-50%);
}

.page-faq .qa-item[open] .qa-mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa-a {
  padding: 0 1.25rem 1.25rem 3.1rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(245, 242, 233, 0.78);
}

.page-faq .qa-a p {
  margin: 0;
}

/* ------------------ 05 更多帮助 ------------------ */

.page-faq .help-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background: linear-gradient(135deg, rgba(30, 77, 64, 0.62), rgba(11, 31, 26, 0.94));
  border: 1px solid var(--line);
}

.page-faq .help-panel::after {
  content: "";
  position: absolute;
  right: -3rem;
  top: -3rem;
  width: 12rem;
  height: 12rem;
  background-image:
    linear-gradient(to right, rgba(201, 162, 39, 0.3) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 162, 39, 0.3) 1px, transparent 1px);
  background-size: 2rem 2rem;
  opacity: 0.35;
  transform: rotate(8deg);
  pointer-events: none;
}

.page-faq .help-panel > * {
  position: relative;
  z-index: 1;
}

.page-faq .help-list {
  display: grid;
  gap: 0.75rem;
  max-width: 40rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .help-list li {
  display: grid;
  gap: 0.2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .help-key {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-faq .help-val {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(245, 242, 233, 0.88);
  word-break: break-word;
}

.page-faq .help-panel .note {
  margin: 1.1rem 0 0;
  max-width: 44rem;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--lime);
}

.page-faq .help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* ------------------ 响应式 ------------------ */

@media (min-width: 640px) {
  .page-faq .index-row {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }

  .page-faq .help-list li {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-faq .index-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.7fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3rem);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 2.25rem;
    padding: 0;
    border-bottom: 0;
  }

  .page-faq .faq-toc__title {
    padding-left: 0.9rem;
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
  }

  .page-faq .faq-toc__list li {
    flex: initial;
  }

  .page-faq .faq-toc__list a {
    width: 100%;
    border: 0;
    border-left: 2px solid rgba(201, 162, 39, 0.18);
    padding: 0.6rem 0.6rem 0.6rem 0.9rem;
    white-space: normal;
    line-height: 1.45;
    background: transparent;
  }

  .page-faq .faq-toc__list a:hover,
  .page-faq .faq-toc__list a:focus-visible {
    background: rgba(47, 107, 88, 0.22);
    border-left-color: var(--gold);
    color: var(--gold-light);
  }

  .page-faq .step-card {
    padding-left: 4.5rem;
  }

  .page-faq .faq-main > .faq-section:first-child {
    padding-top: 0.25rem;
  }
}

@media (min-width: 1080px) {
  .page-faq .tag-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-faq .faq-hero__facts li {
    padding: 0.75rem 0.6rem 0.9rem;
  }

  .page-faq .faq-hero__facts span {
    font-size: 0.6875rem;
  }

  .page-faq .step-card {
    padding-left: 3.4rem;
  }

  .page-faq .step-list::before {
    left: 1.25rem;
  }

  .page-faq .step-card__num {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1rem;
  }

  .page-faq .qa-q {
    padding: 0.85rem 1rem;
    font-size: 1rem;
  }

  .page-faq .qa-a {
    padding: 0 1rem 1rem 2.75rem;
  }
}

/* ------------------ 动效降级 ------------------ */

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}