/* ==========================================================================
   常见问题页 · page-faq
   作用域：.page-faq
   ========================================================================== */

.page-faq {
  --fg-bg: var(--ink-deep);
  --fg: var(--on-dark);
  --fg-dim: var(--on-dark-dim);
  --fg-line: var(--hair);
  --fg-accent: var(--cyan);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-crumb {
  position: relative;
  z-index: 2;
  margin-bottom: 1.75rem;
}
.page-faq .faq-crumb ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.page-faq .faq-crumb li {
  font-size: .8125rem;
  color: var(--on-dark-dim);
}
.page-faq .faq-crumb a {
  color: var(--on-dark-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏拼贴 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2.25rem, 5vw, 3.75rem);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(216, 222, 230, 0.06) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(216, 222, 230, 0.05) 0 1px, transparent 1px 96px);
  pointer-events: none;
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hair);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-faq .faq-hero__lead {
  background: var(--ink-deep);
  padding: clamp(1.5rem, 4vw, 2.75rem) clamp(1.1rem, 2.6vw, 2rem);
}
.page-faq .faq-hero__lead .eyebrow {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  margin: 0;
}
.page-faq .faq-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--on-dark);
  margin: 1rem 0 1.2rem;
  max-width: 22ch;
}
.page-faq .faq-hero__lead .t-lead {
  max-width: 60ch;
  color: var(--on-dark-dim);
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  margin: 0;
}

.page-faq .faq-hero__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hair);
}
.page-faq .faq-hero__stat {
  background: var(--indigo);
  padding: 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.page-faq .faq-hero__stat-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.6vw, 2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}
.page-faq .faq-hero__stat-label {
  font-size: .875rem;
  line-height: 1.65;
  color: var(--on-dark-dim);
}

/* ---------- 分类跳转条 ---------- */
.page-faq .faq-jump {
  background: var(--indigo);
  border-bottom: 1px solid var(--hair);
}
.page-faq .faq-jump__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
}
.page-faq .faq-jump__link {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  padding: .95rem 1.05rem;
  background: var(--indigo);
  color: var(--on-dark);
  text-decoration: none;
  font-size: .9375rem;
  font-weight: 500;
  line-height: 1.4;
  border-bottom: 2px solid transparent;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  background: rgba(44, 229, 210, 0.08);
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-faq .faq-jump__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--cyan);
}

/* ---------- 分组通用 ---------- */
.page-faq .faq-group {
  padding: clamp(3rem, 6.5vw, 5.5rem) 0;
  background: var(--fg-bg);
  color: var(--fg);
}
.page-faq .faq-group--access {
  --fg-bg: var(--ink-deep);
  --fg: var(--on-dark);
  --fg-dim: var(--on-dark-dim);
  --fg-line: var(--hair);
  --fg-accent: var(--cyan);
}
.page-faq .faq-group--device {
  --fg-bg: var(--indigo);
  --fg: var(--on-dark);
  --fg-dim: var(--on-dark-dim);
  --fg-line: var(--hair);
  --fg-accent: var(--cyan-mist);
}
.page-faq .faq-group--account {
  --fg-bg: var(--paper);
  --fg: var(--on-paper);
  --fg-dim: var(--on-paper-dim);
  --fg-line: var(--line);
  --fg-accent: var(--jewel);
}
.page-faq .faq-group--contact {
  --fg-bg: var(--wine);
  --fg: var(--on-dark);
  --fg-dim: var(--on-dark-dim);
  --fg-line: var(--hair);
  --fg-accent: var(--amber);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-bottom: clamp(1.75rem, 3.5vw, 2.75rem);
}
.page-faq .faq-group__index {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fg-dim);
  opacity: .55;
  transition: color .3s var(--ease), opacity .3s var(--ease);
}
.page-faq .faq-group.is-current .faq-group__index {
  color: var(--orange);
  opacity: 1;
}
.page-faq .faq-group__intro h2,
.page-faq .faq-subhead h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.2vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: .55rem 0 .8rem;
  max-width: 24ch;
}
.page-faq .faq-group__note {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--fg-dim);
}
.page-faq .faq-group .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}

/* ---------- 两栏排布 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
  align-items: start;
}
.page-faq .faq-col {
  display: grid;
  gap: 2.25rem;
  min-width: 0;
}
.page-faq .faq-leadtext {
  margin: 0;
  max-width: 62ch;
  color: var(--fg-dim);
  font-size: 1rem;
  line-height: 1.8;
}
.page-faq .faq-leadtext a,
.page-faq .faq-steps__text a,
.page-faq .faq-item__answer a {
  color: var(--fg-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq .faq-steps__item {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: .3rem .9rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--fg-line);
}
.page-faq .faq-steps__item:first-child {
  border-top: 1px solid var(--fg-line);
}
.page-faq .faq-steps__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .875rem;
  line-height: 1.85;
  letter-spacing: .02em;
  color: var(--fg-accent);
}
.page-faq .faq-steps__title {
  display: block;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--fg);
  margin-bottom: .35rem;
}
.page-faq .faq-steps__text {
  margin: 0;
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--fg-dim);
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--fg-line);
}
.page-faq .faq-list--spaced {
  margin-top: clamp(1.75rem, 3.5vw, 2.5rem);
}
.page-faq .faq-list > li {
  border-bottom: 1px solid var(--fg-line);
}
.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: .85rem;
  padding: 1.1rem 0;
  cursor: pointer;
  list-style: none;
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--fg);
  transition: color .2s var(--ease);
}
.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}
.page-faq .faq-item > summary::marker {
  content: "";
}
.page-faq .faq-item > summary::before {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--fg-accent);
  transition: transform .24s var(--ease);
}
.page-faq .faq-item[open] > summary::before {
  transform: rotate(45deg);
}
.page-faq .faq-item > summary:hover {
  color: var(--fg-accent);
}
.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--fg-accent);
  outline-offset: 3px;
}
.page-faq .faq-item__answer {
  padding: 0 0 1.4rem 1.75rem;
  max-width: 68ch;
  font-size: .9375rem;
  line-height: 1.82;
  color: var(--fg-dim);
  animation: faq-fade .24s var(--ease);
}
.page-faq .faq-item__answer p {
  margin: 0;
}
.page-faq .faq-item__answer p + p {
  margin-top: .6rem;
}
@keyframes faq-fade {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 小标题分隔 ---------- */
.page-faq .faq-subhead {
  margin: clamp(2.5rem, 5vw, 4rem) 0 1.5rem;
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--fg-line);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure-wrap {
  margin: 0;
  min-width: 0;
}
.page-faq .faq-figure {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--fg-line);
  background: linear-gradient(150deg, var(--indigo), var(--ink-deep));
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-faq .faq-figure__caption {
  margin: .85rem 0 0;
  max-width: 46ch;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--fg-dim);
}

/* ---------- 账号区侧栏 ---------- */
.page-faq .faq-split--account {
  gap: 2rem;
}
.page-faq .faq-aside {
  border: 1px solid var(--line);
  border-left: 3px solid var(--jewel);
  background: #FFFFFF;
  padding: 1.5rem 1.35rem;
  display: grid;
  gap: .9rem;
  justify-items: start;
  min-width: 0;
}
.page-faq .faq-aside__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--jewel);
}
.page-faq .faq-aside__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--on-paper-dim);
}

/* ---------- 联系渠道 ---------- */
.page-faq .faq-channels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  margin-bottom: 1.25rem;
}
.page-faq .faq-channel {
  background: var(--wine);
  padding: 1.5rem 1.35rem;
  min-width: 0;
}
.page-faq .faq-channel__label {
  display: block;
  margin-bottom: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--amber);
}
.page-faq .faq-channel__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.05rem, 2.6vw, 1.4rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--on-dark);
  word-break: break-word;
}
.page-faq .faq-channel__note {
  margin: .75rem 0 0;
  max-width: 42ch;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--on-dark-dim);
}
.page-faq .faq-response {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .55rem;
  padding: 1.2rem 1.35rem;
  margin-bottom: clamp(1.75rem, 3.5vw, 2.5rem);
  border: 1px solid var(--hair);
  border-left: 3px solid var(--orange);
  background: rgba(255, 122, 61, 0.08);
}
.page-faq .faq-response__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  line-height: 1.2;
  color: var(--orange);
}
.page-faq .faq-response__text {
  margin: 0;
  max-width: 72ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--on-dark-dim);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-cta {
  background: var(--ink-deep);
  border-top: 1px solid var(--hair);
  padding: clamp(2.5rem, 5vw, 4rem) 0;
}
.page-faq .faq-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}
.page-faq .faq-cta h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.8vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--on-dark);
  margin: 0 0 .6rem;
}
.page-faq .faq-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--on-dark-dim);
}
.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ==========================================================================
   断点
   ========================================================================== */

@media (min-width: 640px) {
  .page-faq .faq-hero__panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-faq .faq-response {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: 1.25rem;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-jump__inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-faq .faq-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-steps--wide {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 2.5rem;
  }
  .page-faq .faq-steps--wide .faq-steps__item:nth-child(2) {
    border-top: 1px solid var(--fg-line);
  }
}

@media (min-width: 820px) {
  .page-faq .faq-group__head {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 2rem;
    align-items: start;
  }
  .page-faq .faq-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 3rem;
  }
}

@media (min-width: 940px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 2.05fr) minmax(0, 1fr);
  }
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 3.5rem;
  }
  .page-faq .faq-split--flip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  }
  .page-faq .faq-split--account {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__answer {
    animation: none;
  }
  .page-faq .faq-item > summary::before {
    transition: none;
  }
}