/* ============================================================
   page: faq  —  常见问答
   作用域：.page-faq
   ============================================================ */

.page-faq {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(22px, 4.5vw, 52px);
  padding-bottom: clamp(26px, 5vw, 56px);
}

.page-faq .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-faq .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-faq .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

.page-faq .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-faq .eyebrow--accent {
  color: var(--lava);
}

.page-faq .faq-hero h1 {
  margin: 10px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.95rem, 6.4vw, 3.3rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-faq .faq-search {
  margin-top: 26px;
  max-width: 480px;
}

.page-faq .faq-search label {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sand);
}

.page-faq .faq-search input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 13px 14px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 0;
  appearance: none;
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-search input::placeholder {
  color: var(--mist);
  opacity: 0.8;
}

.page-faq .faq-search input:hover {
  border-color: var(--mist);
}

.page-faq .faq-search input:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-color: var(--cyan);
}

.page-faq .faq-search__hint {
  margin: 9px 0 0;
  font-size: 13px;
  color: var(--mist);
}

.page-faq .faq-hero__fig {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-faq .faq-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.9);
}

.page-faq .faq-hero__fig::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* ---------- 主体：目录 + 问答 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  padding-top: clamp(26px, 4vw, 48px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-index__nav {
  margin-top: 12px;
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px 10px 14px;
  font-size: 15px;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--lava);
}

.page-faq .faq-index__list a:hover {
  color: var(--paper);
  border-left-color: var(--cyan);
  background: var(--ink-2);
}

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

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  scroll-margin-top: 92px;
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(36px, 6vw, 60px);
}

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: 14px;
  row-gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--lava);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 1.85rem);
  line-height: 1.2;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-group__note {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .faq-group:target .faq-group__head {
  border-bottom-color: var(--lava);
}

.page-faq .faq-group:target .faq-group__title {
  color: var(--lava);
}

/* ---------- 折叠条目 ---------- */

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

.page-faq .faq-item > summary {
  position: relative;
  display: block;
  padding: 17px 46px 17px 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.45;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

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

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

.page-faq .faq-item > summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: var(--line);
  transition: background-color var(--dur) var(--ease);
}

.page-faq .faq-item > summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-item > summary:hover {
  background: var(--ink-2);
}

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

.page-faq .faq-item[open] {
  background: var(--paper);
  border-bottom-color: var(--paper-2);
}

.page-faq .faq-item[open] > summary {
  color: var(--brown);
}

.page-faq .faq-item[open] > summary:hover {
  background: var(--paper-2);
}

.page-faq .faq-item[open] > summary::before {
  background: var(--lava);
}

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

.page-faq .faq-item__body {
  max-width: 68ch;
  padding: 0 46px 22px 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--brown);
}

.page-faq .faq-item__body p {
  margin: 0;
}

.page-faq .faq-item__body a {
  color: var(--lava-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--lava-deep);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .faq-item__body a:hover {
  color: var(--brown);
  border-bottom-color: var(--brown);
}

/* ---------- 联系区块 ---------- */

.page-faq .faq-contact {
  background: var(--lava);
  color: var(--brown);
  border-top: 1px solid var(--lava-deep);
}

.page-faq .faq-contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(32px, 5vw, 60px);
  padding-bottom: clamp(32px, 5vw, 60px);
}

.page-faq .faq-contact__eyebrow {
  color: var(--rust);
  letter-spacing: 0.16em;
}

.page-faq .faq-contact__title {
  margin: 12px 0 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.15;
  color: var(--brown);
}

.page-faq .faq-contact__lede {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--rust);
}

.page-faq .faq-contact__list {
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid rgba(26, 21, 18, 0.3);
}

.page-faq .faq-contact__list > div {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid rgba(26, 21, 18, 0.3);
}

.page-faq .faq-contact__list dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--rust);
}

.page-faq .faq-contact__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 2.4vw, 1.15rem);
  font-weight: 700;
  color: var(--brown);
  overflow-wrap: anywhere;
}

.page-faq .faq-contact__list dd a {
  color: var(--brown);
  text-decoration: none;
  border-bottom: 1px solid rgba(26, 21, 18, 0.4);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-contact__list dd a:hover {
  border-bottom-color: var(--brown);
}

.page-faq .faq-contact__list dd a:focus-visible {
  outline: 2px solid var(--brown);
  outline-offset: 3px;
}

.page-faq .faq-contact__note {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rust);
}

.page-faq .faq-contact__actions {
  margin: 24px 0 0;
}

.page-faq .faq-contact__fig {
  margin: 0;
  border: 1px solid rgba(26, 21, 18, 0.35);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-body {
    gap: clamp(32px, 5vw, 56px);
  }

  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-contact__list > div {
    grid-template-columns: 120px minmax(0, 1fr);
  }
}

@media (min-width: 880px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 300px);
    align-items: end;
  }

  .page-faq .faq-hero__fig {
    align-self: end;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: 208px minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 96px;
  }

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

  .page-faq .faq-contact__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}