.page-faq {
  --faq-line: rgba(36, 53, 111, 0.58);
  --faq-panel: rgba(12, 22, 51, 0.86);
  --faq-panel-raised: rgba(19, 32, 72, 0.92);

  position: relative;
  isolation: isolate;
  color: var(--text-100);
  background-color: var(--ink-950);
  background-image:
    radial-gradient(1100px 520px at 78% -6%, rgba(47, 227, 232, 0.12), transparent 66%),
    radial-gradient(880px 460px at 0% 16%, rgba(255, 138, 43, 0.06), transparent 70%),
    linear-gradient(to right, rgba(36, 53, 111, 0.30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 53, 111, 0.30) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  background-position: 0 0;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 26px 0 46px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-400) 28%, transparent 88%);
  opacity: 0.42;
}

.page-faq .breadcrumb {
  font-size: 13px;
  margin-bottom: 30px;
  color: var(--text-400);
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: 30px;
}

.page-faq .faq-hero-main {
  max-width: 780px;
}

.page-faq .faq-hero h1 {
  font-size: 28px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 700;
  margin: 12px 0 16px;
  color: var(--text-100);
}

.page-faq .faq-hero .lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-400);
  margin: 0;
  max-width: 680px;
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero-side {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 10px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: var(--faq-panel);
}

.page-faq .faq-fact-num {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
  letter-spacing: 0.02em;
}

.page-faq .faq-fact-label {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--text-400);
}

/* ---------- 三步排查 ---------- */
.page-faq .faq-steps {
  padding: 50px 0 8px;
}

.page-faq .faq-sec-head {
  max-width: 720px;
  margin-bottom: 26px;
}

.page-faq .faq-sec-head h2 {
  font-size: 23px;
  line-height: 1.32;
  letter-spacing: -0.01em;
  margin: 10px 0 12px;
  color: var(--text-100);
}

.page-faq .faq-sec-head .muted {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-400);
}

.page-faq .faq-steps-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-step {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--faq-line);
  border-top: 2px solid var(--cyan-400);
  border-radius: var(--radius);
  background: var(--faq-panel);
}

.page-faq .faq-step-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-200);
  margin-bottom: 10px;
}

.page-faq .faq-step h3 {
  font-size: 16px;
  line-height: 1.5;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--text-100);
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-400);
}

.page-faq .faq-steps-media {
  margin: 30px 0 0;
}

/* ---------- 问答双栏 ---------- */
.page-faq .faq-body {
  padding: 52px 0 56px;
}

.page-faq .faq-layout {
  display: grid;
  gap: 26px;
}

.page-faq .faq-side-sticky {
  display: grid;
  gap: 20px;
}

.page-faq .faq-side .eyebrow {
  margin: 0 0 10px;
}

/* 索引：小屏为横向粘性标签条 */
.page-faq .faq-toc {
  position: sticky;
  top: 0;
  z-index: 20;
  margin: 0 -20px;
  padding: 10px 20px;
  background: rgba(7, 14, 34, 0.94);
  border-bottom: 1px solid var(--faq-line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-faq .faq-toc .toc-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
}

.page-faq .faq-toc a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--text-400);
  text-decoration: none;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-toc a .mono {
  font-size: 10.5px;
  opacity: 0.75;
  color: inherit;
}

.page-faq .faq-toc a[aria-current="true"] {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-950);
  font-weight: 600;
}

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

/* 筛选按钮 */
.page-faq .faq-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-filter .filter-btn {
  padding: 7px 14px;
  border: 1px solid var(--faq-line);
  border-radius: 999px;
  background: transparent;
  color: var(--text-400);
  font-family: inherit;
  font-size: 12.5px;
  line-height: 1.4;
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-faq .faq-filter .filter-btn:hover {
  color: var(--text-100);
  border-color: var(--cyan-400);
}

.page-faq .faq-filter .filter-btn[aria-pressed="true"] {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-950);
  font-weight: 600;
}

/* 分类区块 */
.page-faq .faq-cat {
  padding: 26px 0;
  border-bottom: 1px solid var(--faq-line);
  scroll-margin-top: 80px;
}

.page-faq .faq-cat:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-faq .faq-cat-head {
  padding-left: 16px;
  border-left: 3px solid var(--cyan-400);
  margin-bottom: 16px;
}

.page-faq .faq-cat-num {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan-200);
  margin-bottom: 6px;
}

.page-faq .faq-cat-head h2 {
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  color: var(--text-100);
}

.page-faq .faq-cat-head .muted {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-400);
}

/* 折叠问答 */
.page-faq .faq-list {
  display: grid;
  gap: 8px;
}

.page-faq .qa {
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: var(--faq-panel);
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-faq .qa[open] {
  border-color: rgba(47, 227, 232, 0.45);
  background: var(--faq-panel-raised);
}

.page-faq .qa summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding: 15px 44px 15px 17px;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.62;
  color: var(--text-100);
  transition: color var(--t-fast);
}

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

.page-faq .qa summary::marker {
  content: "";
}

.page-faq .qa summary::after {
  content: "";
  position: absolute;
  right: 19px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--cyan-400);
  border-bottom: 1.5px solid var(--cyan-400);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--t-base);
}

.page-faq .qa[open] summary::after {
  transform: translateY(-25%) rotate(-135deg);
}

.page-faq .qa summary:hover,
.page-faq .qa summary:focus-visible {
  color: var(--cyan-400);
}

.page-faq .qa summary:focus-visible {
  outline: 1px solid var(--cyan-400);
  outline-offset: -3px;
}

.page-faq .qa .qa-body {
  padding: 0 17px 17px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--text-400);
}

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

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

.page-faq .qa[open] .qa-body {
  animation: faqBodyIn 180ms ease-out both;
}

@keyframes faqBodyIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 转人工 ---------- */
.page-faq .faq-help {
  padding: 54px 0 66px;
  border-top: 1px solid var(--faq-line);
  background: linear-gradient(180deg, rgba(19, 32, 72, 0.55) 0%, rgba(7, 14, 34, 0) 100%);
}

.page-faq .faq-help-grid {
  display: grid;
  gap: 28px;
}

.page-faq .faq-help-main h2 {
  font-size: 23px;
  line-height: 1.32;
  letter-spacing: -0.01em;
  margin: 10px 0 14px;
  color: var(--text-100);
}

.page-faq .faq-help-main .lead {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-100);
}

.page-faq .faq-help-main .muted {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--text-400);
}

.page-faq .faq-help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--faq-line);
  font-size: 13px;
}

.page-faq .faq-next a {
  color: var(--text-400);
  text-decoration: none;
}

.page-faq .faq-next a:hover {
  color: var(--cyan-400);
}

.page-faq .faq-contact {
  padding: 22px 20px;
  border: 1px solid var(--faq-line);
  border-top: 2px solid var(--signal-500);
  border-radius: var(--radius);
  background: var(--faq-panel);
}

.page-faq .faq-contact-title {
  margin: 0 0 14px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--signal-500);
}

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

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

.page-faq .faq-contact-list > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-contact-list dt {
  font-size: 12px;
  color: var(--text-400);
  letter-spacing: 0.04em;
}

.page-faq .faq-contact-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cyan-200);
  word-break: break-all;
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-hero {
    padding: 22px 0 38px;
  }

  .page-faq .breadcrumb {
    margin-bottom: 22px;
  }

  .page-faq .faq-hero h1 {
    font-size: 24px;
  }

  .page-faq .faq-hero-side {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-faq .faq-fact {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 14px;
  }

  .page-faq .faq-fact-num {
    font-size: 17px;
  }

  .page-faq .faq-sec-head h2,
  .page-faq .faq-help-main h2 {
    font-size: 20px;
  }

  .page-faq .faq-cat-head h2 {
    font-size: 19px;
  }
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-steps-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-faq .faq-hero h1 {
    font-size: 32px;
  }

  .page-faq .faq-sec-head h2,
  .page-faq .faq-help-main h2 {
    font-size: 26px;
  }

  .page-faq .faq-cat-head h2 {
    font-size: 22px;
  }

  .page-faq .faq-hero .lead {
    font-size: 16px;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 1000px) {
  .page-faq .faq-hero {
    padding: 34px 0 56px;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 56px;
    align-items: end;
  }

  .page-faq .faq-hero h1 {
    font-size: 42px;
    line-height: 1.22;
  }

  .page-faq .faq-hero-side {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-top: 0;
    border-top: 0;
  }

  .page-faq .faq-fact {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 14px;
    padding: 12px 16px;
  }

  .page-faq .faq-fact-num {
    font-size: 26px;
  }

  .page-faq .faq-steps {
    padding: 66px 0 10px;
  }

  .page-faq .faq-steps-list {
    gap: 20px;
  }

  .page-faq .faq-step {
    padding: 26px 24px 28px;
  }

  .page-faq .faq-body {
    padding: 68px 0 72px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 272px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-side-sticky {
    position: sticky;
    top: 88px;
  }

  .page-faq .faq-toc {
    position: static;
    margin: 0;
    padding: 0 0 0 1px;
    background: none;
    border-bottom: 0;
    overflow: visible;
  }

  .page-faq .faq-toc .toc-index {
    display: grid;
    gap: 2px;
    border-left: 1px solid var(--faq-line);
  }

  .page-faq .faq-toc a {
    display: flex;
    align-items: baseline;
    justify-content: flex-start;
    gap: 10px;
    padding: 8px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    font-size: 13.5px;
    white-space: normal;
  }

  .page-faq .faq-toc a:hover {
    color: var(--text-100);
    background: rgba(47, 227, 232, 0.05);
  }

  .page-faq .faq-toc a[aria-current="true"] {
    background: linear-gradient(90deg, rgba(47, 227, 232, 0.12), transparent 90%);
    border-left-color: var(--cyan-400);
    color: var(--cyan-400);
    font-weight: 600;
  }

  .page-faq .faq-toc a .mono {
    font-size: 10.5px;
  }

  .page-faq .faq-cat {
    padding: 32px 0;
  }

  .page-faq .qa summary {
    font-size: 15px;
    padding: 17px 52px 17px 20px;
  }

  .page-faq .qa .qa-body {
    padding: 0 20px 20px;
    font-size: 14px;
  }

  .page-faq .faq-help {
    padding: 68px 0 78px;
  }

  .page-faq .faq-help-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-faq .faq-help-main h2 {
    font-size: 30px;
  }
}

@media (min-width: 1280px) {
  .page-faq .faq-layout {
    grid-template-columns: 296px minmax(0, 1fr);
    gap: 64px;
  }
}

/* ---------- 降级动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa summary::after {
    transition: none;
  }

  .page-faq .qa[open] .qa-body {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .page-faq .faq-toc a,
  .page-faq .faq-filter .filter-btn,
  .page-faq .qa {
    transition: none;
  }
}