/* ===== 支持中心 /support/ ===== */

.page-faq {
  --faq-rail: 262px;
  --faq-link-line: rgba(53, 240, 208, 0.38);
  --faq-pad-y: clamp(34px, 6vw, 88px);
  --faq-group-gap: clamp(52px, 9vw, 124px);
  display: block;
  background: var(--ink-deep);
  color: var(--mist-text);
  font-family: var(--font-body);
}

.page-faq *,
.page-faq *::before,
.page-faq *::after { box-sizing: border-box; }

.page-faq .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.94em;
  color: var(--mist-text);
  background: var(--ink-surface);
  border: 1px solid var(--moss-line);
  padding: 1px 6px;
  white-space: nowrap;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-intro {
  position: relative;
  overflow: hidden;
  background: var(--ink-abyss);
  border-bottom: 1px solid var(--moss-line);
  padding: var(--faq-pad-y) 0;
}

.page-faq .faq-intro::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to right, var(--moss-line) 1px, transparent 1px);
  background-size: 88px 100%;
  opacity: 0.24;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 38%, transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 38%, transparent);
}

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

.page-faq .faq-intro__kicker {
  margin: 22px 0 0;
  color: var(--fluoro-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-faq .faq-intro__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-intro__lede {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.75;
  color: var(--mist-text);
}

.page-faq .faq-intro__scale {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 0;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--moss-line);
}

.page-faq .faq-intro__scale li {
  flex: 1 1 150px;
  min-width: 132px;
  padding-right: 18px;
  border-right: 1px solid var(--moss-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.55;
  color: var(--mist-dim);
}

.page-faq .faq-intro__scale li:last-child { border-right: 0; }

.page-faq .faq-intro__scale b {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.2vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body__shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: clamp(30px, 5vw, 56px);
  padding-top: var(--faq-pad-y);
  padding-bottom: var(--faq-pad-y);
}

@media (min-width: 900px) {
  .page-faq .faq-body__shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(40px, 5.5vw, 92px);
  }
}

/* ---------- 左栏分组索引 ---------- */

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

@media (min-width: 900px) {
  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--topline-h) + 26px);
  }
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--moss-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-dim);
}

.page-faq .faq-index__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 640px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 20px;
  }
}

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

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

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 4px 11px 0;
  border-bottom: 1px solid var(--moss-line);
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  transform: translateY(-2px);
}

.page-faq .faq-index__link:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: 2px;
}

.page-faq .faq-index__dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--graphite);
  transform: translateY(-2px);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .faq-index__link:hover .faq-index__dot,
.page-faq .faq-index__link:focus-visible .faq-index__dot {
  background: var(--fluoro-cyan);
  box-shadow: 0 0 0 4px var(--cyan-glass);
}

.page-faq .faq-index__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist-dim);
}

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

/* ---------- 右栏问答流 ---------- */

.page-faq .faq-stream {
  display: grid;
  gap: var(--faq-group-gap);
  min-width: 0;
}

.page-faq .faq-group {
  min-width: 0;
  scroll-margin-top: calc(var(--topline-h) + 26px);
}

.page-faq .faq-group__head {
  display: grid;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px solid var(--moss-line);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-group:target .faq-group__head { border-top-color: var(--fluoro-cyan); }

.page-faq .faq-group__code {
  color: var(--fluoro-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.7vw, 2.15rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--paper);
}

/* 图 */

.page-faq .faq-figure {
  margin: 26px 0 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--moss-line);
  background: var(--ink-surface);
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  line-height: 1.65;
  color: var(--mist-dim);
}

/* 问答 */

.page-faq .faq-qa {
  margin-top: 28px;
  border-top: 1px solid var(--moss-line);
}

.page-faq .faq-qa details {
  border-bottom: 1px solid var(--moss-line);
  scroll-margin-top: calc(var(--topline-h) + 26px);
}

.page-faq .faq-qa summary {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: 0.01em;
  color: var(--mist-text);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .faq-qa summary:hover { color: var(--paper); }

.page-faq .faq-qa summary:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: 2px;
}

.page-faq .faq-qa summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--fluoro-cyan);
}

.page-faq .faq-qa details[open] summary::after { content: "\2212"; }

.page-faq .faq-qa__body {
  max-width: 64ch;
  padding: 0 0 24px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist-dim);
}

.page-faq .faq-qa__body p { margin: 0 0 0.9em; }
.page-faq .faq-qa__body p:last-child { margin-bottom: 0; }

.page-faq .faq-qa__body ul {
  margin: 0 0 0.9em;
  padding-left: 1.15em;
}

.page-faq .faq-qa__body li { margin-bottom: 0.35em; }

.page-faq .faq-qa__body a,
.page-faq .faq-contact__note a {
  color: var(--fluoro-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-link-line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-qa__body a:hover,
.page-faq .faq-qa__body a:focus-visible,
.page-faq .faq-contact__note a:hover,
.page-faq .faq-contact__note a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--fluoro-cyan);
}

.page-faq .faq-qa__body a:focus-visible,
.page-faq .faq-contact__note a:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: 2px;
}

/* ---------- 联系信息 ---------- */

.page-faq .faq-contact {
  margin: 28px 0 0;
  border-top: 1px solid var(--moss-line);
}

.page-faq .faq-contact__row {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--moss-line);
}

@media (min-width: 640px) {
  .page-faq .faq-contact__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

.page-faq .faq-contact__term {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist-dim);
}

.page-faq .faq-contact__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist-text);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__note {
  max-width: 64ch;
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-dim);
}

/* ---------- 全部问题折叠 ---------- */

.page-faq .faq-all {
  scroll-margin-top: calc(var(--topline-h) + 26px);
}

.page-faq .faq-all__summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  border-top: 1px solid var(--moss-line);
  border-bottom: 1px solid var(--moss-line);
  transition: border-color var(--dur) var(--ease);
}

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

.page-faq .faq-all__summary:hover { border-bottom-color: var(--fluoro-cyan); }

.page-faq .faq-all__summary:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: 2px;
}

.page-faq .faq-all__label {
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 600;
  color: var(--mist-text);
}

.page-faq .faq-all__count {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist-dim);
}

.page-faq .faq-all__mark {
  position: relative;
  flex: none;
  width: 26px;
  height: 1px;
  margin-left: auto;
  background: var(--fluoro-cyan);
}

.page-faq .faq-all__mark::after {
  content: "";
  position: absolute;
  left: 12.5px;
  top: -6px;
  width: 1px;
  height: 13px;
  background: var(--fluoro-cyan);
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-all__details[open] .faq-all__mark::after { transform: scaleY(0); }

.page-faq .faq-all__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 10px 0 0;
  list-style: none;
}

@media (min-width: 640px) {
  .page-faq .faq-all__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 28px;
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-all__list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.page-faq .faq-all__list a {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid var(--moss-line);
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-faq .faq-all__list a:hover,
.page-faq .faq-all__list a:focus-visible {
  color: var(--fluoro-cyan);
  padding-left: 6px;
}

.page-faq .faq-all__list a:focus-visible {
  outline: 2px solid var(--fluoro-cyan);
  outline-offset: 2px;
}

/* ---------- 窄屏与动效降级 ---------- */

@media (max-width: 480px) {
  .page-faq .faq-intro__scale li {
    flex: 1 1 100%;
    padding-right: 0;
    border-right: 0;
    border-bottom: 1px solid var(--moss-line);
    padding-bottom: 10px;
  }
  .page-faq .faq-intro__scale li:last-child { border-bottom: 0; }
  .page-faq .faq-qa summary::after { font-size: 0.95rem; }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible { transform: none; }
}