/* ===== 答疑中心 · 页面专属样式 ===== */

.page-faq {
  --faq-line: rgba(53, 240, 192, .22);
  --faq-soft: rgba(232, 243, 239, .76);
  --faq-num-w: 28px;
  display: block;
  background:
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 34%, var(--moss-900) 78%, var(--ink-900) 100%);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-open {
  position: relative;
  padding: 28px 0 56px;
  background: linear-gradient(158deg, var(--ink-800) 0%, var(--ink-900) 68%);
}

.page-faq .faq-open::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan-soft) 26%, var(--moss-line) 62%, transparent 100%);
  opacity: .55;
}

.page-faq .faq-open__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan-soft);
}

.page-faq .faq-open__dot {
  width: 5px;
  height: 5px;
  background: var(--amber);
  transform: rotate(45deg);
}

.page-faq .faq-open h1 {
  margin: 20px 0 0;
  max-width: 14em;
  font-size: clamp(30px, 7.2vw, 54px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-open__lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--faq-soft);
}

.page-faq .faq-outline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-outline__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border: var(--border-w) solid var(--moss-line);
  background: var(--moss-900);
  box-shadow: var(--shadow-hard);
  color: var(--paper);
  text-decoration: none;
  transition: box-shadow 140ms var(--ease), transform 140ms var(--ease), border-color 140ms var(--ease);
}

.page-faq .faq-outline__link:hover,
.page-faq .faq-outline__link:focus-visible {
  border-color: var(--cyan);
  box-shadow: var(--shadow-press);
  transform: translate(4px, 4px);
}

.page-faq .faq-outline__num {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

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

/* ---------- 主体布局 ---------- */
.page-faq .faq-layout {
  padding-top: 44px;
  padding-bottom: 64px;
}

.page-faq .faq-index {
  margin-bottom: 36px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan-soft);
}

.page-faq .faq-index__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-index__item {
  flex: none;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 10px 14px;
  border: 2px solid var(--moss-line);
  background: var(--moss-900);
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 140ms var(--ease), color 140ms var(--ease);
}

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

.page-faq .faq-index__num {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .06em;
}

.page-faq .faq-index__name {
  font-size: 15px;
  font-weight: 700;
}

.page-faq .faq-index__count {
  font-size: 12px;
  color: var(--amber);
}

.page-faq .faq-index__note {
  margin: 10px 0 0;
  max-width: 30ch;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(232, 243, 239, .55);
}

/* ---------- 分类组 ---------- */
.page-faq .faq-group {
  scroll-margin-top: 150px;
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: var(--border-w) solid var(--moss-line);
}

.page-faq .faq-group__num {
  font-size: clamp(34px, 8vw, 46px);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-faq .faq-group__meta h2 {
  margin: 4px 0 0;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .faq-group__meta p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.65;
  color: rgba(141, 247, 222, .82);
}

.page-faq .faq-figure {
  margin: 24px 0 0;
  border: var(--border-w) solid var(--moss-line);
  box-shadow: var(--shadow-hard);
  background: var(--moss-700);
  overflow: hidden;
}

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

.page-faq .faq-stack {
  margin-top: 26px;
}

/* ---------- 问答条 ---------- */
.page-faq .qa {
  border-bottom: 1px solid var(--slate);
  border-left: var(--border-w) solid transparent;
  transition: border-left-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-faq .qa[open] {
  border-left-color: var(--cyan);
  background: rgba(16, 59, 51, .55);
}

.page-faq .qa:hover {
  background: rgba(16, 59, 51, .3);
}

.page-faq .qa__bar {
  display: grid;
  grid-template-columns: var(--faq-num-w) minmax(0, 1fr) 20px;
  column-gap: 14px;
  align-items: baseline;
  padding: 22px 16px 22px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .qa__num {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-faq .qa[open] .qa__num {
  color: var(--amber);
}

.page-faq .qa__q {
  font-size: clamp(16px, 2.6vw, 19px);
  line-height: 1.55;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .qa__toggle {
  position: relative;
  width: 16px;
  height: 16px;
  align-self: center;
}

.page-faq .qa__toggle::before,
.page-faq .qa__toggle::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  margin-top: -1px;
  background: var(--cyan);
  transition: transform 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .qa__toggle::after {
  transform: rotate(90deg);
}

.page-faq .qa[open] .qa__toggle::after {
  transform: rotate(0deg);
}

.page-faq .qa[open] .qa__toggle::before,
.page-faq .qa[open] .qa__toggle::after {
  background: var(--amber);
}

.page-faq .qa__answer {
  display: grid;
  grid-template-columns: var(--faq-num-w) minmax(0, 1fr);
  column-gap: 14px;
  padding: 0 18px 26px;
}

.page-faq .qa__answer p {
  grid-column: 2;
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--faq-soft);
}

/* ---------- 分类之间的横带 ---------- */
.page-faq .faq-band {
  height: 10px;
  margin: 52px 0;
  background: var(--moss-700);
  border-top: 1px solid var(--moss-line);
  border-bottom: 1px solid var(--moss-line);
  clip-path: polygon(0 0, 100% 0, calc(100% - 22px) 100%, 0 100%);
}

/* ---------- 出口区 ---------- */
.page-faq .faq-escape {
  padding: 0 0 72px;
  scroll-margin-top: 150px;
}

.page-faq .faq-escape__box {
  position: relative;
  padding: 32px 22px 34px;
  border: var(--border-w) solid var(--amber-deep);
  background: linear-gradient(140deg, var(--moss-900) 0%, var(--ink-800) 100%);
  box-shadow: var(--shadow-hard);
}

.page-faq .faq-escape__num {
  display: block;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-faq .faq-escape__box h2 {
  margin: 12px 0 0;
  font-size: clamp(21px, 4.6vw, 28px);
  line-height: 1.25;
  font-weight: 800;
  color: var(--paper);
}

.page-faq .faq-escape__box p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--faq-soft);
}

.page-faq .faq-escape__mail {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-escape__mail:hover,
.page-faq .faq-escape__mail:focus-visible {
  color: var(--amber);
}

.page-faq .faq-escape__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 560px) {
  .page-faq .faq-open {
    padding-bottom: 44px;
  }

  .page-faq .faq-outline {
    grid-template-columns: 1fr;
  }

  .page-faq .qa__bar {
    grid-template-columns: 24px minmax(0, 1fr) 18px;
    column-gap: 10px;
    padding: 20px 12px 20px 14px;
  }

  .page-faq .qa__answer {
    grid-template-columns: 24px minmax(0, 1fr);
    column-gap: 10px;
    padding: 0 14px 22px;
  }

  .page-faq .faq-band {
    margin: 40px 0;
    clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  }

  .page-faq .faq-escape__box {
    padding: 26px 16px 28px;
  }
}

/* ---------- 桌面端：左侧固定索引 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-open {
    padding: 44px 0 84px;
  }

  .page-faq .faq-outline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    margin-top: 42px;
  }

  .page-faq .faq-outline__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px 18px;
  }

  .page-faq .faq-layout {
    display: grid;
    grid-template-columns: 236px minmax(0, 1fr);
    column-gap: 56px;
    align-items: start;
    padding-top: 64px;
    padding-bottom: 88px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 132px;
    margin-bottom: 0;
  }

  .page-faq .faq-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index__item + .page-faq .faq-index__item {
    margin-top: 8px;
  }

  .page-faq .faq-index__link {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 10px;
    width: 100%;
    border-width: 0;
    border-left: var(--border-w) solid var(--moss-line);
    background: transparent;
    padding: 11px 12px 11px 14px;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(16, 59, 51, .6);
  }

  .page-faq .faq-index__name {
    white-space: normal;
  }

  .page-faq .faq-group__head {
    gap: 22px;
    padding-bottom: 22px;
  }

  .page-faq .faq-band {
    margin: 64px 0;
  }

  .page-faq .faq-escape__box {
    padding: 44px 48px 46px;
    max-width: 900px;
  }
}
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