.page-faq {
  --faq-rail-w: 236px;
  --faq-soft-text: rgba(245, 249, 255, 0.78);
  --faq-deep-text: #22405c;
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.75;
  max-width: 1240px;
  margin: 0 auto;
  padding: var(--gap-3) var(--gap-2) var(--gap-5);
  overflow-x: clip;
}

@media (min-width: 760px) {
  .page-faq {
    padding-left: var(--gap-4);
    padding-right: var(--gap-4);
  }
}

/* 面包屑 */
.page-faq .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--mist);
  padding-top: var(--gap-2);
}

.page-faq .crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .crumbs a:hover,
.page-faq .crumbs a:focus-visible {
  color: var(--orange-300);
  border-bottom-color: var(--orange-300);
}

.page-faq .crumbs__sep {
  color: var(--line-strong);
}

.page-faq .crumbs [aria-current="page"] {
  color: var(--white);
}

/* 首屏 */
.page-faq .faq-hero {
  display: grid;
  gap: var(--gap-3);
  padding: var(--gap-4) 0;
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: -1px -1px;
}

.page-faq .faq-hero > * {
  min-width: 0;
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: var(--gap-4);
  }
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7.2vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: var(--gap-2) 0;
  max-width: 15ch;
}

.page-faq .faq-hero__lead {
  font-size: 15px;
  color: var(--faq-soft-text);
  margin: 0 0 var(--gap-2);
  max-width: 48ch;
}

.page-faq .faq-jump {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 var(--gap-2);
  padding: 0;
}

.page-faq .faq-jump a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--white);
  text-decoration: none;
  background: rgba(18, 59, 94, 0.62);
  border: 1px solid var(--line-strong);
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  border-color: var(--orange-500);
  color: var(--orange-300);
  background: rgba(255, 106, 26, 0.1);
}

.page-faq .faq-hero__meta {
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.02em;
  margin: 0;
}

.page-faq .faq-hero__media {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--panel-500);
  overflow: hidden;
}

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

/* 高频三件事 */
.page-faq .faq-quick {
  padding: var(--gap-3) 0 0;
}

.page-faq .faq-quick__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
  margin: 0 0 var(--gap-2);
}

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

.page-faq .faq-quick__list li {
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-quick__list a {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: var(--gap-2);
  align-items: baseline;
  padding: 14px var(--gap-2);
  text-decoration: none;
  color: var(--white);
  border-left: 2px solid transparent;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-quick__list a:hover,
.page-faq .faq-quick__list a:focus-visible {
  border-left-color: var(--orange-500);
  background: rgba(18, 59, 94, 0.5);
}

.page-faq .faq-quick__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange-500);
  letter-spacing: 0.02em;
}

.page-faq .faq-quick__text strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
}

.page-faq .faq-quick__text span {
  display: block;
  font-size: 14px;
  color: var(--mist);
  line-height: 1.65;
}

/* 主体：左侧分类轨道 + 右侧问答 */
.page-faq .faq-body {
  display: grid;
  gap: var(--gap-4);
  padding-top: var(--gap-4);
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    align-items: start;
    gap: var(--gap-4);
  }
}

.page-faq .faq-main {
  min-width: 0;
}

.page-faq .faq-rail {
  border-top: 1px solid var(--line-strong);
  padding-top: var(--gap-2);
}

@media (min-width: 1000px) {
  .page-faq .faq-rail {
    position: sticky;
    top: var(--gap-3);
    align-self: start;
  }
}

.page-faq .faq-rail__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  margin: 0 0 var(--gap-1);
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

@media (min-width: 1000px) {
  .page-faq .faq-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-faq .faq-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

@media (min-width: 1000px) {
  .page-faq .faq-rail__list a {
    white-space: normal;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-left: 2px solid transparent;
    padding: 12px 8px 12px 12px;
  }
}

.page-faq .faq-rail__list a:hover,
.page-faq .faq-rail__list a:focus-visible {
  color: var(--white);
  border-left-color: var(--orange-500);
  background: rgba(18, 59, 94, 0.55);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan-400);
}

.page-faq .faq-rail__note {
  margin: var(--gap-2) 0 0;
  padding: 12px var(--gap-2);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  background: rgba(18, 59, 94, 0.6);
  border-left: 2px solid var(--cyan-400);
}

/* 分类组 */
.page-faq .faq-group {
  scroll-margin-top: 88px;
  margin-bottom: var(--gap-5);
}

.page-faq .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--orange-500);
  margin: 0 0 6px;
}

.page-faq .faq-group h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.page-faq .faq-group__lead {
  margin: 0 0 var(--gap-2);
  font-size: 15px;
  color: var(--mist);
  max-width: 52ch;
}

.page-faq .faq-group__items {
  border-top: 1px solid var(--line);
}

/* 问答手风琴 */
.page-faq .qa {
  border-bottom: 1px solid var(--line);
}

.page-faq .qa summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--gap-2);
  list-style: none;
  cursor: pointer;
  padding: 14px 4px 14px 14px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--white);
  border-left: 2px solid transparent;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

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

.page-faq .qa summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.35;
  color: var(--cyan-400);
}

.page-faq .qa summary:hover,
.page-faq .qa summary:focus-visible {
  border-left-color: var(--orange-300);
  background: rgba(18, 59, 94, 0.4);
  outline: none;
}

.page-faq .qa[open] summary {
  border-left-color: var(--orange-500);
}

.page-faq .qa[open] summary::after {
  content: "−";
  color: var(--orange-500);
}

.page-faq .qa__body {
  padding: 0 4px 18px 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--faq-soft-text);
}

.page-faq .qa__body p {
  margin: 0 0 8px;
}

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

.page-faq .qa__body a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .qa__body a:hover,
.page-faq .qa__body a:focus-visible {
  color: var(--orange-300);
}

/* 换设备步骤带 */
.page-faq .swap-band {
  margin: var(--gap-3) 0 0;
  padding: var(--gap-3);
  background: linear-gradient(140deg, var(--ink-700), var(--panel-500) 72%);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--cyan-400);
}

.page-faq .swap-band h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.15;
  margin: 0 0 var(--gap-2);
}

.page-faq .swap-steps {
  list-style: none;
  margin: 0 0 var(--gap-3);
  padding: 0;
  display: grid;
  gap: var(--gap-2);
}

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

.page-faq .swap-steps li {
  padding-top: 12px;
  border-top: 2px solid var(--orange-500);
}

.page-faq .swap-steps__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
  margin-bottom: 4px;
}

.page-faq .swap-steps li strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
}

.page-faq .swap-steps li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .swap-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-900);
}

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

/* 联系支持 */
.page-faq .contact-panel {
  display: grid;
  gap: var(--gap-3);
  padding: var(--gap-3);
  background: var(--ice);
  color: var(--black);
}

@media (min-width: 900px) {
  .page-faq .contact-panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: var(--gap-4);
    padding: var(--gap-4);
    align-items: start;
  }
}

.page-faq .contact-panel .eyebrow {
  color: var(--ink-700);
  margin-bottom: 6px;
}

.page-faq .contact-panel__h {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.2vw, 26px);
  line-height: 1.2;
  margin: 0 0 var(--gap-2);
  color: var(--black);
}

.page-faq .contact-panel .faq-group__items {
  border-top-color: rgba(8, 19, 31, 0.18);
}

.page-faq .contact-panel .qa {
  border-bottom-color: rgba(8, 19, 31, 0.16);
}

.page-faq .contact-panel .qa summary {
  color: var(--black);
  font-size: 15px;
}

.page-faq .contact-panel .qa summary:hover,
.page-faq .contact-panel .qa summary:focus-visible {
  background: rgba(8, 19, 31, 0.05);
  border-left-color: var(--orange-500);
}

.page-faq .contact-panel .qa__body {
  color: var(--faq-deep-text);
  font-size: 14px;
}

.page-faq .contact-panel .qa__body a {
  color: #0b5f7a;
}

.page-faq .contact-card {
  background: var(--ink-900);
  color: var(--white);
  padding: var(--gap-3);
  border: 1px solid var(--line-strong);
}

.page-faq .contact-card__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
  margin: 0 0 2px;
}

.page-faq .contact-card__v {
  font-size: 15px;
  line-height: 1.6;
  margin: 0 0 var(--gap-2);
  word-break: break-word;
}

.page-faq .contact-card__v--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-faq .contact-card .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 44px;
  margin-top: var(--gap-1);
}

/* 减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump a,
  .page-faq .qa summary,
  .page-faq .faq-rail__list a,
  .page-faq .faq-quick__list a {
    transition: none;
  }
}