/* ===== 问答中心（page-faq）===== */

.page-faq {
  --faq-radius: var(--radius-card);
  --faq-pad: 20px;
  padding-bottom: 72px;
}

/* ---------- 首屏说明 ---------- */
.page-faq .faq-intro {
  position: relative;
  padding-block: 28px 40px;
  isolation: isolate;
}

.page-faq .faq-intro::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -60px;
  left: -10%;
  width: 120%;
  height: 380px;
  background: radial-gradient(58% 100% at 22% 0%, rgba(43, 240, 216, 0.11), transparent 68%);
  pointer-events: none;
}

.page-faq .faq-intro h1 {
  margin: 14px 0 0;
  max-width: 22ch;
  font-size: clamp(1.75rem, 6.4vw, 3.15rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper-100);
}

.page-faq .faq-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist-400);
}

.page-faq .faq-intro-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  margin: 30px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-blue);
}

.page-faq .faq-intro-stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--mist-400);
}

.page-faq .faq-intro-stats .num-mono {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: -0.02em;
}

/* ---------- 通用小组件 ---------- */
.page-faq .faq-sub {
  margin: 10px 0 0;
  max-width: 52ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--mist-400);
}

.page-faq .faq-em {
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 700;
  color: var(--orange-500);
}

.page-faq .faq-inline-link {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 240, 216, 0.4);
}

.page-faq .faq-inline-link:hover {
  border-bottom-color: var(--cyan-400);
}

/* ---------- 01 主题索引 ---------- */
.page-faq .faq-topic-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-topic-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  border: 1px solid var(--line-blue);
  border-radius: var(--faq-radius);
  background: linear-gradient(180deg, rgba(14, 22, 49, 0.92), rgba(7, 11, 26, 0.92));
  color: var(--paper-100);
  text-decoration: none;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-faq .faq-topic-card:hover,
.page-faq .faq-topic-card:focus-visible {
  border-color: var(--cyan-400);
  transform: translateY(-2px);
}

.page-faq .faq-topic-no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-faq .faq-topic-card h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-faq .faq-topic-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mist-400);
}

.page-faq .faq-topic-jump {
  margin-top: auto;
  padding-top: 6px;
  font-size: 0.8125rem;
  color: var(--cyan-400);
}

/* ---------- 02 高频问题 ---------- */
.page-faq .faq-filter {
  margin-top: 22px;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.page-faq .faq-filter::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-hot-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hot-item {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 18px;
  border: 1px solid var(--line-blue);
  border-radius: var(--faq-radius);
  background: var(--ink-700);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq .faq-hot-item:hover {
  border-color: var(--cyan-700);
  background: var(--ink-600);
}

.page-faq .faq-hot-item[hidden] {
  display: none;
}

.page-faq .faq-hot-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-faq .faq-hot-q {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper-100);
}

.page-faq .faq-hot-a {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--mist-400);
}

/* ---------- 03 / 04 分栏区块 ---------- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 26px;
}

.page-faq .faq-shot {
  margin: 0;
  border: 1px solid var(--line-blue);
  border-radius: var(--faq-radius);
  background: var(--ink-700);
  overflow: hidden;
}

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

.page-faq .faq-shot .figure-caption {
  padding: 12px 16px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist-400);
}

.page-faq .faq-shot--wide {
  margin-top: 24px;
}

/* ---------- 折叠面板 ---------- */
.page-faq .faq-accordion-wrap {
  margin-top: 4px;
}

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

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

.page-faq .accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 16px 0;
  border: 0;
  background: none;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.6;
  text-align: left;
  color: var(--paper-100);
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

.page-faq .accordion-trigger:hover {
  color: var(--cyan-400);
}

.page-faq .accordion-trigger::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-right: 4px;
  border-right: 2px solid var(--cyan-400);
  border-bottom: 2px solid var(--cyan-400);
  transform: rotate(45deg);
  transition: transform 0.25s var(--ease);
}

.page-faq .accordion-trigger[aria-expanded="true"]::after {
  transform: rotate(-135deg);
}

.page-faq .accordion-panel {
  padding: 0 0 18px;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist-400);
}

.page-faq .accordion-panel[hidden] {
  display: none;
}

.page-faq .accordion-panel p {
  margin: 0;
}

/* ---------- 06 人工支持 ---------- */
.page-faq .faq-help-card {
  margin-top: 8px;
  padding: 28px 20px;
  border: 1px solid var(--line-blue);
  border-radius: var(--faq-radius);
  background:
    radial-gradient(120% 110% at 100% 0%, rgba(43, 240, 216, 0.1), transparent 62%),
    var(--ink-700);
}

.page-faq .faq-help-card h2 {
  margin: 12px 0 0;
  font-size: clamp(1.35rem, 4.6vw, 1.9rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--paper-100);
}

.page-faq .faq-help-lede {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist-400);
}

.page-faq .faq-contact-list {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-contact-line {
  display: grid;
  gap: 5px;
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line-blue);
  border-radius: 10px;
  background: rgba(7, 11, 26, 0.65);
  font: inherit;
  text-align: left;
}

.page-faq button.faq-contact-line {
  cursor: pointer;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-faq button.faq-contact-line:hover {
  border-color: var(--cyan-400);
  background: rgba(18, 169, 154, 0.1);
}

.page-faq .faq-contact-line .contact-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mist-400);
}

.page-faq .faq-contact-line .contact-value {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--paper-100);
  word-break: break-word;
}

.page-faq .faq-contact-line .contact-value--mono {
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

.page-faq .faq-help-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .faq-help-note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-blue);
  font-size: 0.8125rem;
  line-height: 1.8;
  color: var(--mist-400);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-topic-track {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .faq-hot-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .faq-filter {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .page-faq .faq-contact-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .faq-contact-line:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-topic-track {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .faq-intro {
    padding-block: 44px 56px;
  }

  .page-faq .faq-split {
    grid-template-columns: 5fr 6fr;
    gap: 44px;
    align-items: start;
  }

  .page-faq .faq-accordion-wrap .accordion-item {
    padding-left: 18px;
  }

  .page-faq .faq-accordion-wrap .accordion-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 18px;
    bottom: 18px;
    width: 2px;
    border-radius: 2px;
    background: var(--line-blue);
    transition: background 0.25s var(--ease);
  }

  .page-faq .faq-accordion-wrap .accordion-item:has(.accordion-trigger[aria-expanded="true"])::before {
    background: var(--cyan-400);
  }

  .page-faq .faq-help-card {
    padding: 40px 44px;
  }

  .page-faq .faq-contact-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .faq-contact-line:last-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-topic-card,
  .page-faq .faq-hot-item,
  .page-faq .accordion-trigger::after,
  .page-faq .accordion-item::before {
    transition: none;
  }

  .page-faq .faq-topic-card:hover {
    transform: none;
  }
}