.page-faq {
  --faq-cut: polygon(0 12px, 12px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  --faq-gap: clamp(16px, 2.4vw, 28px);

  display: block;
  position: relative;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(185, 198, 216, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(185, 198, 216, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-faq .faq-shell {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 面包屑 ---------- */
.page-faq .faq-breadcrumb {
  padding-block: 16px 4px;
  border-bottom: 1px solid var(--line);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding-block: clamp(26px, 4.5vw, 52px) clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  max-width: 22ch;
  font-family: var(--font-narrow);
  font-size: clamp(30px, 5.2vw, 50px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.page-faq .faq-hero .lede {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-faq .faq-figures {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 36px);
  margin-top: clamp(24px, 4vw, 36px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-figure {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-faq .faq-figure__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--teal);
}

.page-faq .faq-figure__value em {
  font-style: normal;
  font-size: 0.6em;
}

.page-faq .faq-figure__value--signal {
  color: var(--orange);
}

.page-faq .faq-figure__label {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* 索引面板 */
.page-faq .faq-index {
  position: relative;
  padding: 20px 20px 22px;
  background: linear-gradient(165deg, var(--panel-2), var(--panel) 58%, var(--bg));
  border: 1px solid var(--line);
  clip-path: var(--faq-cut);
  box-shadow: var(--shadow-lift);
}

.page-faq .faq-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-faq .faq-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
  text-decoration: none;
  transition: color 0.16s var(--ease), padding-left 0.16s var(--ease);
}

.page-faq .faq-index__list li:last-child .faq-index__link {
  border-bottom: 0;
}

.page-faq .faq-index__link .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 0.16s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--teal);
  padding-left: 8px;
}

.page-faq .faq-index__link:hover .mono,
.page-faq .faq-index__link:focus-visible .mono {
  color: var(--teal);
}

/* ---------- 章节骨架 ---------- */
.page-faq .faq-block {
  padding-block: clamp(36px, 5vw, 60px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-block--device {
  background: linear-gradient(170deg, rgba(11, 47, 44, 0.78), rgba(6, 11, 20, 0.08) 78%);
  border-top-color: rgba(0, 229, 196, 0.22);
}

.page-faq .faq-block--archive {
  background: linear-gradient(170deg, rgba(36, 20, 54, 0.82), rgba(6, 11, 20, 0.08) 78%);
}

.page-faq .faq-block--support {
  background: linear-gradient(170deg, rgba(255, 107, 26, 0.07), rgba(6, 11, 20, 0) 62%);
}

.page-faq .faq-block__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 14px;
  align-items: center;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-faq .faq-block__label {
  grid-row: 1;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #04120f;
  background: var(--teal);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 88% 100%, 0 100%);
}

.page-faq .faq-block__title {
  grid-row: 1;
  margin: 0;
  font-family: var(--font-narrow);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: #ffffff;
}

.page-faq .faq-block__note {
  grid-column: 1 / -1;
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 分栏与列表 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
}

.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 960px;
}

/* ---------- 可展开问答 ---------- */
.page-faq .disclosure {
  border: 1px solid var(--line);
  border-left: 2px solid rgba(0, 229, 196, 0.3);
  background: var(--panel);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .disclosure:hover {
  border-left-color: var(--teal);
}

.page-faq .disclosure[data-open="true"] {
  border-left-color: var(--teal);
  background: rgba(22, 33, 58, 0.78);
}

.page-faq .disclosure__btn {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr) auto;
  gap: 8px 12px;
  align-items: start;
  width: 100%;
  margin: 0;
  padding: 16px 18px;
  border: 0;
  background: none;
  color: inherit;
  text-align: left;
  font: inherit;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.page-faq .disclosure__btn:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: -2px;
}

.page-faq .q-no {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

.page-faq .disclosure[data-open="true"] .q-no {
  color: var(--teal);
}

.page-faq .q-text {
  font-size: 16px;
  line-height: 1.62;
  font-weight: 600;
  color: var(--ink);
  transition: color 0.18s var(--ease);
}

.page-faq .disclosure[data-open="true"] .q-text {
  color: #ffffff;
}

.page-faq .disclosure__icon {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  flex: none;
}

.page-faq .disclosure__icon::before,
.page-faq .disclosure__icon::after {
  content: "";
  position: absolute;
  background: var(--silver);
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .disclosure__icon::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.page-faq .disclosure__icon::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-faq .disclosure[data-open="true"] .disclosure__icon::before {
  background: var(--teal);
}

.page-faq .disclosure[data-open="true"] .disclosure__icon::after {
  background: var(--teal);
  transform: scaleY(0);
}

.page-faq .disclosure__body {
  overflow: hidden;
}

.page-faq .disclosure__inner {
  padding: 14px 18px 20px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 47, 44, 0.72), rgba(11, 47, 44, 0.3));
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

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

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

.page-faq .disclosure__inner a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.js .page-faq .disclosure__body {
  height: 0;
}

.js .page-faq .disclosure[data-open="true"] .disclosure__body {
  height: auto;
}

/* ---------- 编号步骤 ---------- */
.page-faq .steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faq-step;
}

.page-faq .steps li {
  position: relative;
  padding-left: 36px;
  padding-bottom: 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-faq .steps li::before {
  counter-increment: faq-step;
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--line-teal);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--teal);
}

.page-faq .steps li::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 27px;
  bottom: 2px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-teal), rgba(0, 229, 196, 0));
}

.page-faq .steps li:last-child {
  padding-bottom: 0;
}

.page-faq .steps li:last-child::after {
  display: none;
}

/* ---------- 三步流程 ---------- */
.page-faq .flow {
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .flow__node {
  position: relative;
  padding: 16px 18px 18px;
  background: rgba(13, 21, 38, 0.8);
  border: 1px solid var(--line);
  clip-path: var(--faq-cut);
  transition: border-color 0.18s var(--ease), transform 0.2s var(--ease);
}

.page-faq .flow__node:hover {
  border-color: var(--line-teal);
  transform: translateY(-2px);
}

.page-faq .flow__step {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.page-faq .flow__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: #ffffff;
}

.page-faq .flow__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

.page-faq .flow__node:hover .flow__desc {
  color: var(--ink);
}

/* ---------- 配图 ---------- */
.page-faq .faq-media {
  margin: 0;
  background: var(--panel-2);
  border: 1px solid var(--line);
  overflow: hidden;
  clip-path: polygon(0 14px, 14px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-faq .faq-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-faq .faq-media--tall {
  max-width: 340px;
  margin-inline: auto;
}

.page-faq .faq-media--wide {
  max-width: 900px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

/* ---------- 联系信息条 ---------- */
.page-faq .faq-contactbar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 30px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-faq .faq-contactbar__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel);
}

.page-faq .faq-contactbar__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-faq .faq-contactbar__val {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-contactbar__val--signal {
  font-family: var(--font-mono);
  color: var(--orange);
}

/* ---------- 后续入口 ---------- */
.page-faq .faq-next {
  padding-block: clamp(30px, 4vw, 48px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(13, 21, 38, 0.7), rgba(6, 11, 20, 0));
}

.page-faq .faq-next__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: #ffffff;
}

.page-faq .faq-next__note {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-next__link {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .faq-next__link:hover,
.page-faq .faq-next__link:focus-visible {
  border-color: var(--teal);
  color: var(--teal);
  background: rgba(0, 229, 196, 0.07);
}

/* ---------- 响应式 ---------- */
@media (min-width: 779px) {
  .page-faq .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 2.6vw, 32px);
  }

  .page-faq .flow__node::after {
    content: "";
    position: absolute;
    top: 50%;
    right: calc(-1 * clamp(18px, 2.6vw, 32px));
    width: clamp(18px, 2.6vw, 32px);
    height: 1px;
    background: linear-gradient(90deg, var(--line-teal), rgba(0, 229, 196, 0));
    pointer-events: none;
  }

  .page-faq .flow__node:last-child::after {
    display: none;
  }

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

@media (min-width: 940px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.72fr);
    align-items: end;
    gap: clamp(24px, 4vw, 56px);
  }
}

@media (min-width: 980px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.7fr);
    align-items: start;
    gap: clamp(24px, 3.4vw, 40px);
  }

  .page-faq .faq-media--tall {
    margin-inline: 0 auto;
    max-width: 100%;
  }
}

@media (max-width: 560px) {
  .page-faq .disclosure__btn {
    grid-template-columns: 2.2em minmax(0, 1fr) auto;
    padding: 14px 14px;
  }

  .page-faq .disclosure__inner {
    padding: 12px 14px 18px;
  }

  .page-faq .q-text {
    font-size: 15px;
  }

  .page-faq .faq-figures {
    gap: 16px 24px;
  }

  .page-faq .flow__node {
    padding: 14px 15px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .disclosure,
  .page-faq .disclosure__btn,
  .page-faq .disclosure__icon::before,
  .page-faq .disclosure__icon::after,
  .page-faq .disclosure__body,
  .page-faq .flow__node,
  .page-faq .flow__desc,
  .page-faq .faq-index__link,
  .page-faq .faq-index__link .mono,
  .page-faq .faq-next__link,
  .page-faq .q-no,
  .page-faq .q-text {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-faq .flow__node:hover {
    transform: none;
  }
}