.page-faq {
  --faq-paper-line: rgba(10, 21, 36, .14);
  --faq-paper-dim: rgba(10, 21, 36, .68);
  background:
    radial-gradient(circle at 14% 2%, rgba(255, 122, 26, .10), transparent 44%),
    radial-gradient(circle at 88% 22%, rgba(27, 74, 60, .55), transparent 40%),
    var(--ink-900);
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(26px, 5vw, 56px) clamp(24px, 4vw, 44px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -22%;
  width: min(560px, 62vw);
  height: min(560px, 62vw);
  background: linear-gradient(150deg, rgba(27, 74, 60, .85), rgba(10, 21, 36, 0) 72%);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  opacity: .7;
  pointer-events: none;
}

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

.page-faq .faq-hero .h1 {
  max-width: 20ch;
  letter-spacing: -.02em;
  text-wrap: balance;
}

.page-faq .faq-hero .lede {
  max-width: 62ch;
  margin-top: clamp(14px, 2vw, 20px);
  color: var(--white-72);
}

.page-faq .faq-band {
  position: relative;
  margin-top: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(165deg, var(--ink-800), var(--ink-900));
}

.page-faq .faq-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 1;
  object-fit: cover;
  filter: saturate(.92) brightness(.92);
}

.page-faq .faq-band .media__cap {
  position: absolute;
  left: 18px;
  bottom: 14px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--white-72);
  background: rgba(10, 21, 36, .62);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
}

/* ---------- 分类索引 ---------- */
.page-faq .faq-index__list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-index__item {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num title"
    "num desc"
    "num tag";
  gap: 4px 16px;
  align-items: baseline;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(27, 74, 60, .30), rgba(10, 21, 36, .18));
  color: var(--white);
  text-decoration: none;
  transition: transform .3s var(--ease), border-color .3s var(--ease), background-color .3s var(--ease);
}

.page-faq .faq-index__item:hover,
.page-faq .faq-index__item:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(255, 122, 26, .55);
}

.page-faq .faq-index__num {
  grid-area: num;
  font-size: 22px;
  font-weight: 600;
  color: var(--ember);
  line-height: 1.1;
}

.page-faq .faq-index__title {
  grid-area: title;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-faq .faq-index__desc {
  grid-area: desc;
  font-size: 14px;
  line-height: 1.6;
  color: var(--white-56);
}

.page-faq .faq-index__item .tag {
  grid-area: tag;
  margin-top: 6px;
  justify-self: start;
}

/* ---------- 问答分组 ---------- */
.page-faq .faq-group {
  padding-block: clamp(34px, 6vw, 76px);
}

.page-faq .faq-group__inner {
  position: relative;
}

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

.page-faq .faq-group--paper {
  background: var(--paper);
  color: var(--ink-900);
  border-top: none;
}

.page-faq .faq-group--paper + .faq-group {
  border-top: none;
}

.page-faq .faq-group--paper .lede {
  color: var(--faq-paper-dim);
}

.page-faq .faq-group--paper .eyebrow {
  color: var(--ink-700);
}

.page-faq .faq-list {
  margin-top: clamp(16px, 2.4vw, 26px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group--paper .faq-list {
  border-top-color: var(--faq-paper-line);
}

.page-faq .faq-item {
  position: relative;
  padding-left: 20px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group--paper .faq-item {
  border-bottom-color: var(--faq-paper-line);
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--ember);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .32s var(--ease);
}

.page-faq .faq-item[open]::before {
  transform: scaleY(1);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 700;
  letter-spacing: -.01em;
  transition: color .24s var(--ease);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--haze);
  transition: color .24s var(--ease);
}

.page-faq .faq-item[open] summary {
  color: var(--ember);
}

.page-faq .faq-item[open] summary::after {
  content: "\2212";
  color: var(--ember);
}

.page-faq .faq-item__a {
  display: grid;
  gap: 10px;
  max-width: 68ch;
  padding-bottom: 22px;
  color: var(--white-72);
}

.page-faq .faq-item__a p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
}

.page-faq .faq-item__a a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 198, 74, .45);
}

.page-faq .faq-item__a a:hover {
  border-bottom-color: var(--amber);
}

.page-faq .faq-group--paper .faq-item__a {
  color: var(--faq-paper-dim);
}

.page-faq .faq-group--paper .faq-item__a a {
  color: #b3510c;
  border-bottom-color: rgba(179, 81, 12, .4);
}

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faq-step;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-steps li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15.5px;
  line-height: 1.7;
}

.page-faq .faq-steps li::before {
  counter-increment: faq-step;
  content: counter(faq-step, decimal-leading-zero);
  flex: none;
  margin-top: 2px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  color: var(--ember);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
}

.page-faq .faq-group--paper .faq-steps li::before {
  border-color: var(--faq-paper-line);
  color: #b3510c;
}

/* ---------- 账号与设备分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(16px, 2.4vw, 26px);
}

.page-faq .faq-split .faq-list {
  margin-top: 0;
}

.page-faq .faq-device-media {
  position: relative;
  margin: 0;
  align-self: start;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(160deg, var(--ink-700), var(--ink-900));
}

.page-faq .faq-device-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: brightness(.86) saturate(.9);
}

.page-faq .faq-device-media .media__cap {
  display: block;
  margin: 0;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--white-72);
  border-top: 1px solid var(--line);
}

/* ---------- 人工支持 ---------- */
.page-faq .faq-support {
  padding-block: clamp(38px, 6vw, 82px);
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  border-top: 1px solid var(--line);
}

.page-faq .faq-support .lede {
  max-width: 64ch;
  color: var(--white-72);
}

.page-faq .faq-contact {
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-contact .contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(10, 21, 36, .5);
}

.page-faq .faq-contact .contact-line__label {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--haze);
  min-width: 76px;
}

.page-faq .faq-contact .contact-line__value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-faq .faq-contact .copy-btn {
  margin-left: auto;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--white);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: border-color .24s var(--ease), color .24s var(--ease);
}

.page-faq .faq-contact .copy-btn:hover,
.page-faq .faq-contact .copy-btn:focus-visible {
  border-color: var(--ember);
  color: var(--ember);
}

.page-faq .faq-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-faq .faq-links {
  display: grid;
  gap: 12px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-links__item a {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  color: var(--white);
  text-decoration: none;
  background: linear-gradient(150deg, rgba(27, 74, 60, .24), rgba(10, 21, 36, .12));
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-faq .faq-links__item a:hover,
.page-faq .faq-links__item a:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(255, 122, 26, .5);
}

.page-faq .faq-links__title {
  font-size: 16px;
  font-weight: 700;
}

.page-faq .faq-links__desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--white-56);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-faq .faq-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-faq .faq-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-index__list li:first-child {
    grid-column: span 2;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-item summary {
    padding: 22px 0;
  }

  .page-faq .faq-index__item {
    padding: 22px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__item,
  .page-faq .faq-links__item a,
  .page-faq .faq-item::before {
    transition: none;
  }

  .page-faq .faq-index__item:hover,
  .page-faq .faq-links__item a:hover {
    transform: none;
  }
}