.page-faq {
  --faq-line: rgba(36, 31, 26, 0.12);
  --faq-line-strong: rgba(36, 31, 26, 0.24);
  --faq-surface: rgba(255, 255, 255, 0.5);
  position: relative;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

.page-faq .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: clamp(20px, 3vw, 32px);
  font-size: 14px;
}

.page-faq .breadcrumb-sep {
  color: var(--rock);
  font-size: 13px;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(26px, 4vw, 48px) clamp(40px, 6vw, 76px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--faq-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--faq-line) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(120% 84% at 10% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 84% at 10% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: clamp(10px, 4vw, 60px);
  right: clamp(-140px, -8vw, -40px);
  width: clamp(200px, 34vw, 440px);
  height: clamp(200px, 34vw, 440px);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 200, 206, 0.2) 0%, rgba(0, 200, 206, 0) 68%);
  pointer-events: none;
}

.page-faq .faq-hero-title {
  margin: 14px 0 0;
  max-width: 15ch;
  font-size: clamp(38px, 6vw, 82px);
  line-height: 1.08;
}

.page-faq .faq-hero-lead {
  margin: 22px 0 0;
  max-width: 64ch;
  color: var(--ink);
}

.page-faq .faq-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px clamp(20px, 4vw, 52px);
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--faq-line-strong);
  list-style: none;
}

.page-faq .faq-fact {
  flex: 1 1 140px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-faq .faq-fact strong {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-faq .faq-fact span {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--rock);
}

/* ---------- 快速定位 ---------- */

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

.page-faq .faq-finder-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-faq .faq-finder-col,
.page-faq .faq-finder-media {
  min-width: 0;
}

@media (min-width: 960px) {
  .page-faq .faq-finder-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }
}

.page-faq .faq-quick {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 620px) {
  .page-faq .faq-quick {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq .faq-quick-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 4px;
  align-items: center;
  height: 100%;
  padding: 16px 18px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-md);
  background: var(--faq-surface);
  color: var(--ink);
  text-decoration: none;
  transition:
    border-color var(--dur) var(--ease),
    background var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-faq .faq-quick-link:hover,
.page-faq .faq-quick-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(0, 200, 206, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 200, 206, 0.16);
}

.page-faq .faq-quick-code {
  grid-row: span 2;
  align-self: center;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--rust);
}

.page-faq .faq-quick-name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-faq .faq-quick-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.page-faq .faq-finder-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(40px, 6vw, 80px) clamp(28px, 4vw, 48px);
}

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

.page-faq .faq-rail {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 0 0 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--silver) transparent;
}

.page-faq .rail-link {
  display: block;
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--faq-line);
  border-radius: var(--pill);
  font-size: 13.5px;
  color: var(--rock);
  text-decoration: none;
  white-space: nowrap;
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-faq .rail-link:hover,
.page-faq .rail-link:focus-visible {
  color: var(--ink);
  border-color: var(--cyan);
  background: rgba(0, 200, 206, 0.08);
}

@media (min-width: 1040px) {
  .page-faq .faq-body {
    grid-template-columns: 176px minmax(0, 1fr);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-faq .rail-link {
    border-width: 0 0 0 2px;
    border-color: transparent;
    border-left-color: var(--faq-line-strong);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 7px 10px 7px 14px;
    white-space: normal;
  }

  .page-faq .rail-link:hover,
  .page-faq .rail-link:focus-visible {
    border-left-color: var(--rust);
    background: rgba(223, 205, 169, 0.45);
  }
}

/* ---------- 问答折叠 ---------- */

.page-faq .faq-cluster {
  scroll-margin-top: 116px;
}

.page-faq .faq-cluster + .faq-cluster {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-faq .faq-cluster-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

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

.page-faq .faq-item {
  border-left: 2px solid var(--faq-line);
  border-bottom: 1px solid var(--faq-line);
  transition: border-left-color var(--dur) var(--ease);
}

.page-faq .faq-item[open] {
  border-left-color: var(--rust);
}

.page-faq .faq-summary {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 12px 18px 20px;
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease);
}

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

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

.page-faq .faq-summary:hover {
  background: rgba(223, 205, 169, 0.28);
}

.page-faq .faq-summary::after {
  content: "+";
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.3;
  color: var(--teal);
}

.page-faq .faq-item[open] > .faq-summary::after {
  content: "−";
  color: var(--rust);
}

.page-faq .faq-num {
  flex: 0 0 auto;
  padding-top: 5px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--rust);
}

.page-faq .faq-q {
  flex: 1 1 auto;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.62;
  color: var(--ink);
}

.page-faq .faq-answer {
  padding: 0 44px 22px 62px;
}

.page-faq .faq-answer p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--rock);
}

/* ---------- 安装 / 登录 / 同步 ---------- */

.page-faq .faq-tabs {
  margin-top: 10px;
}

.page-faq .capsule-tabs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-faq .capsule-tab {
  appearance: none;
  padding: 10px 22px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--pill);
  background: transparent;
  font: inherit;
  font-size: 15px;
  color: var(--rock);
  cursor: pointer;
  transition:
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    background var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-faq .capsule-tab:hover {
  color: var(--ink);
  border-color: var(--cyan);
}

.page-faq .capsule-tab[aria-selected="true"] {
  color: var(--ink);
  border-color: var(--cyan);
  background: rgba(0, 200, 206, 0.15);
  box-shadow: inset 0 0 0 1px rgba(0, 200, 206, 0.4);
}

.page-faq .faq-panel {
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-lg);
  background: var(--faq-surface);
}

.page-faq .faq-steps {
  counter-reset: faq-step;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-steps li {
  position: relative;
  padding-left: 48px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--rock);
}

.page-faq .faq-steps li + li {
  border-top: 1px dashed var(--faq-line);
  padding-top: 16px;
}

.page-faq .faq-steps li::before {
  counter-increment: faq-step;
  content: counter(faq-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.page-faq .faq-steps li strong {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 下载失败四类原因 ---------- */

.page-faq .faq-causes {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

@media (min-width: 720px) {
  .page-faq .faq-causes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-faq .faq-cause {
  position: relative;
  padding: 28px 24px 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-faq .faq-cause::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--mint), var(--cyan));
  opacity: 0.7;
}

.page-faq .faq-cause-num {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--rust);
}

.page-faq .faq-cause .card-title {
  margin: 0 0 10px;
}

.page-faq .faq-cause .card-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: var(--rock);
}

/* ---------- 反馈与进度 ---------- */

.page-faq .faq-feedback-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: 28px;
}

@media (min-width: 900px) {
  .page-faq .faq-feedback-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
  }
}

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

.page-faq .faq-feedback-types {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-feedback-types li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.88;
  color: var(--rock);
}

.page-faq .faq-feedback-types li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 2px;
  background: var(--rust);
}

.page-faq .faq-feedback-types strong {
  color: var(--ink);
}

.page-faq .faq-response {
  display: grid;
  gap: 10px;
  margin-top: 28px;
  padding: 22px;
  border: 1px solid rgba(36, 31, 26, 0.1);
  border-radius: var(--radius-md);
  background: var(--sand);
}

.page-faq .faq-response p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink);
}

.page-faq .faq-response strong {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--rust-deep);
}

.page-faq .faq-mailcard {
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--radius-lg);
  align-self: start;
}

.page-faq .faq-mailcard .card-title {
  margin: 0 0 6px;
}

.page-faq .faq-mail-line {
  display: block;
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.page-faq .faq-mail-code {
  display: inline-block;
  margin-top: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: rgba(36, 31, 26, 0.1);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-faq .faq-mailcard .btn {
  margin-top: 22px;
}

.page-faq .faq-loop {
  counter-reset: faq-loop;
  display: grid;
  gap: 12px;
  margin: clamp(30px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 780px) {
  .page-faq .faq-loop {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-faq .faq-loop li {
  counter-increment: faq-loop;
  position: relative;
  padding: 18px 16px 16px;
  border-radius: var(--radius-md);
  background: var(--night);
  color: var(--silver);
  font-size: 13.5px;
  line-height: 1.75;
}

.page-faq .faq-loop li::before {
  content: counter(faq-loop, decimal-leading-zero);
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-faq .faq-loop li strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--paper);
}

/* ---------- 自助清单 ---------- */

.page-faq .faq-flow-media {
  margin: 30px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-faq .faq-checklist-list {
  display: grid;
  gap: 12px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 760px) {
  .page-faq .faq-checklist-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 26px;
  }
}

.page-faq .faq-checklist-list li {
  position: relative;
  padding: 15px 18px 15px 50px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  background: var(--faq-surface);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-faq .faq-checklist-list li::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 21px;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(-45deg);
}

/* ---------- 收尾指引 ---------- */

.page-faq .faq-next {
  margin-bottom: clamp(40px, 6vw, 80px);
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background: var(--night);
  color: var(--silver);
}

.page-faq .faq-next .next-step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-next .next-step-title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-faq .faq-next p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.88;
  color: var(--silver);
}

.page-faq .faq-next .next-step-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
  padding: 13px 26px;
  border-radius: var(--pill);
  background: var(--cyan);
  color: var(--ink);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  transition:
    filter var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-faq .faq-next .next-step-link:hover,
.page-faq .faq-next .next-step-link:focus-visible {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

/* ---------- 窄屏调整 ---------- */

@media (max-width: 640px) {
  .page-faq .faq-summary {
    padding: 16px 10px 16px 14px;
    gap: 12px;
  }

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

  .page-faq .faq-answer {
    padding: 0 16px 20px 20px;
  }

  .page-faq .faq-steps li {
    padding-left: 40px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-quick-link,
  .page-faq .rail-link,
  .page-faq .capsule-tab,
  .page-faq .faq-next .next-step-link {
    transition-duration: 120ms;
    transform: none;
  }
}