.page-faq {
  --rail-w: 250px;
  --faq-card: rgba(11, 34, 57, 0.5);
  display: block;
  overflow-x: clip;
  background: var(--void);
  color: var(--bone);
}

/* ============ 首屏 ============ */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 8vw, 96px) 0 clamp(36px, 6vw, 78px);
  border-bottom: 1px solid var(--line-1);
  background:
    radial-gradient(120% 120% at 84% -12%, rgba(138, 92, 255, 0.16), transparent 58%),
    linear-gradient(160deg, var(--abyss) 0%, var(--void) 74%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: -20%;
  width: min(48vw, 540px);
  aspect-ratio: 1 / 1.45;
  background: linear-gradient(140deg, rgba(57, 242, 200, 0.16), rgba(91, 209, 230, 0.02) 62%);
  transform: rotate(12deg);
  clip-path: polygon(30% 0, 100% 0, 72% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-title {
  margin: 18px 0 20px;
  max-width: 16ch;
  font-family: var(--font-head);
  font-size: clamp(2.1rem, 7.2vw, 4.8rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--bone);
  text-wrap: balance;
}

.page-faq .faq-lead {
  max-width: 62ch;
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--rock);
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--line-2);
  background: rgba(5, 7, 13, 0.55);
  color: var(--bone);
  font-size: 0.92rem;
  text-decoration: none;
  transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translate(-2px, -2px);
}

.page-faq .faq-jump-idx {
  color: var(--cyan);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

/* ============ 通用章节头 ============ */
.page-faq .faq-head {
  max-width: 68ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-faq .faq-head h2 {
  margin: 12px 0 12px;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.page-faq .faq-head p {
  margin: 0;
  color: var(--rock);
  line-height: 1.78;
}

/* ============ 入口速查 ============ */
.page-faq .faq-entries {
  padding: clamp(46px, 8vw, 92px) 0;
  background: linear-gradient(180deg, var(--void) 0%, var(--abyss) 140%);
}

.page-faq .faq-entry-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  align-items: start;
}

.page-faq .faq-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-2);
  background: rgba(5, 7, 13, 0.6);
  box-shadow: var(--shadow-soft);
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 0.93rem;
}

.page-faq .faq-table caption {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.06em;
  color: var(--cyan);
  border-bottom: 1px solid var(--line-1);
}

.page-faq .faq-table thead th {
  padding: 12px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--bone);
  background: var(--steel);
  white-space: nowrap;
}

.page-faq .faq-table tbody td {
  padding: 13px 16px;
  vertical-align: top;
  line-height: 1.65;
  color: var(--rock);
  border-bottom: 1px solid var(--line-1);
}

.page-faq .faq-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-table tbody tr {
  transition: background 0.16s ease;
}

.page-faq .faq-table tbody tr:hover {
  background: rgba(91, 209, 230, 0.06);
}

.page-faq .faq-table tbody td:first-child {
  border-left: 2px solid transparent;
}

.page-faq .faq-table tbody tr:hover td:first-child {
  border-left-color: var(--cyan);
}

.page-faq .faq-num {
  color: var(--moss);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.page-faq .faq-table a {
  color: var(--cool);
  text-decoration: none;
  border-bottom: 1px solid rgba(91, 209, 230, 0.35);
}

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

.page-faq .faq-media {
  margin: 0;
}

.page-faq .faq-media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-2);
  background: var(--abyss);
  object-fit: cover;
}

.page-faq .faq-media .media-caption {
  margin-top: 10px;
  color: var(--rock);
  font-size: var(--fs-meta);
  line-height: 1.6;
}

/* ============ 技能树问答 ============ */
.page-faq .faq-tree {
  padding: clamp(46px, 8vw, 96px) 0;
  border-top: 1px solid var(--line-1);
  background:
    linear-gradient(180deg, var(--abyss) 0%, var(--void) 60%);
}

.page-faq .faq-tree-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-faq .tree-rail {
  padding: 16px 0 0;
  border-top: 2px solid var(--line-2);
}

.page-faq .tree-nav {
  display: flex;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0 0 6px;
  overflow-x: auto;
  list-style: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .tree-nav a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 13px;
  border-left: 2px solid var(--line-2);
  color: var(--rock);
  font-size: 0.92rem;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-faq .tree-nav a .mono {
  color: var(--moss);
  font-size: 0.72rem;
}

.page-faq .tree-nav a:hover,
.page-faq .tree-nav a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(57, 242, 200, 0.07);
}

.page-faq .tree-rail-note {
  display: none;
  margin: 18px 0 0;
  color: var(--rock);
  font-size: var(--fs-meta);
  line-height: 1.7;
}

.page-faq .tree-stream {
  min-width: 0;
}

.page-faq .tree-branch {
  padding: 0 0 clamp(30px, 5vw, 52px);
}

.page-faq .tree-branch + .tree-branch {
  padding-top: clamp(26px, 4vw, 46px);
  border-top: 1px dashed var(--line-2);
}

.page-faq .branch-head {
  margin-bottom: 18px;
}

.page-faq .branch-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--bone);
}

.page-faq .qa-item {
  border: 1px solid var(--line-1);
  background: var(--faq-card);
  margin-bottom: 10px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-faq .qa-item:hover {
  border-color: var(--line-2);
}

.page-faq .qa-item[open] {
  border-color: rgba(57, 242, 200, 0.45);
  box-shadow: 4px 4px 0 rgba(57, 242, 200, 0.12);
}

.page-faq .qa-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--bone);
}

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

.page-faq .qa-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .qa-q-mark {
  flex: none;
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  padding-top: 4px;
}

.page-faq .qa-q-text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa-q-toggle {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 5px;
}

.page-faq .qa-q-toggle::before,
.page-faq .qa-q-toggle::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--cyan);
}

.page-faq .qa-q-toggle::before {
  width: 14px;
  height: 2px;
}

.page-faq .qa-q-toggle::after {
  width: 2px;
  height: 14px;
  transition: transform 0.2s ease;
}

.page-faq .qa-item[open] .qa-q-toggle::after {
  transform: scaleY(0);
}

.page-faq .qa-a {
  padding: 14px 16px 18px 48px;
  border-top: 1px dashed var(--line-1);
  color: var(--rock);
  font-size: 0.95rem;
  line-height: 1.78;
}

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

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

.page-faq .qa-a-lead {
  color: var(--bone);
  font-weight: 700;
}

/* ============ 联系支持 ============ */
.page-faq .faq-contact {
  padding: clamp(46px, 8vw, 96px) 0;
  border-top: 1px solid var(--line-1);
  background:
    radial-gradient(90% 120% at 8% 0%, rgba(255, 138, 61, 0.12), transparent 60%),
    linear-gradient(180deg, var(--void) 0%, var(--abyss) 150%);
}

.page-faq .faq-contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.page-faq .support-cards {
  display: grid;
  gap: 12px;
}

.page-faq .support-card {
  padding: 18px 18px 20px;
  background: rgba(5, 7, 13, 0.6);
}

.page-faq .support-label {
  margin: 0 0 8px;
  font-size: var(--fs-meta);
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-faq .support-value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--bone);
  word-break: break-word;
}

.page-faq .support-desc {
  margin: 0;
  color: var(--rock);
  font-size: 0.94rem;
  line-height: 1.72;
}

.page-faq .support-cta {
  justify-self: start;
  margin-top: 6px;
}

.page-faq .faq-media--support img {
  border-color: var(--line-2);
}

/* ============ 响应式 ============ */
@media (min-width: 700px) {
  .page-faq .tree-rail-note {
    display: block;
  }

  .page-faq .faq-contact-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }

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

  .page-faq .support-cards > .support-cta,
  .page-faq .support-cards > .support-card:last-of-type {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-tree-layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-faq .tree-rail {
    position: sticky;
    top: calc(var(--rail-h) + var(--bar-h) + 28px);
    padding-top: 20px;
  }

  .page-faq .tree-nav {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .tree-nav a {
    width: 100%;
    padding: 11px 14px;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-entry-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump a,
  .page-faq .qa-item,
  .page-faq .qa-q-toggle::after,
  .page-faq .tree-nav a,
  .page-faq .faq-table tbody tr {
    transition: none;
  }

  .page-faq .faq-jump a:hover,
  .page-faq .faq-jump a:focus-visible {
    transform: none;
  }
}