/* =========================================================
   FAQ 问答中心 — 页面专属样式
   作用域：.page-faq（移动端优先）
   ========================================================= */
.page-faq {
  --faq-sidebar: 280px;
  background: var(--color-white);
}

/* ---------- 顶部对角色块英雄区 ---------- */
.page-faq .faq-hero {
  position: relative;
  background: var(--color-black);
  color: var(--color-white);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: 42%;
  background: var(--color-red);
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: 42%;
  background: var(--color-blue);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  opacity: .35;
  pointer-events: none;
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--content-pad);
  padding-top: calc(var(--content-pad) + 1rem);
  padding-bottom: calc(var(--content-pad) + 2rem);
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: 2rem;
  margin-top: 2.25rem;
}

.page-faq .faq-kicker {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-red);
  background: var(--color-red-tint);
  padding: .4rem .8rem;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 10px 100%);
}

.page-faq .faq-hero h1 {
  margin: 1.25rem 0 .9rem;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2.1rem, 6vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--color-white);
  max-width: 13em;
}

.page-faq .faq-hero-lead {
  margin: 0;
  max-width: 34em;
  color: var(--color-silver);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 1vw + .9rem, 1.125rem);
  line-height: 1.75;
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: 1.6rem;
}

.page-faq .faq-hero-actions .btn {
  border: 1px solid rgba(255, 255, 255, .35);
  color: var(--color-white);
  background: transparent;
  transition: background .2s ease, border-color .2s ease, transform .15s ease;
}

.page-faq .faq-hero-actions .btn:hover {
  background: rgba(255, 255, 255, .1);
  border-color: var(--color-white);
}

.page-faq .faq-hero-actions .btn-accent {
  background: var(--color-red);
  border-color: var(--color-red);
}

.page-faq .faq-hero-actions .btn-accent:hover {
  filter: brightness(.92);
}

.page-faq .faq-hero .breadcrumb {
  color: var(--color-silver);
}

.page-faq .faq-hero .breadcrumb a {
  color: var(--color-silver);
  text-decoration: none;
  transition: color .2s ease;
}

.page-faq .faq-hero .breadcrumb a:hover {
  color: var(--color-white);
}

.page-faq .faq-hero .breadcrumb-sep {
  color: var(--color-red);
}

/* ---------- 统计面板 ---------- */
.page-faq .faq-hero-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem 1rem;
  background: var(--color-deep);
  border-left: 4px solid var(--color-red);
  padding: 1.5rem 1.25rem;
  position: relative;
}

.page-faq .faq-hero-panel::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, transparent 50%, var(--color-amber) 50%);
  opacity: .85;
  pointer-events: none;
}

.page-faq .faq-hero-stat {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.page-faq .faq-hero-num {
  font-family: var(--font-ui);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1;
  color: var(--color-white);
}

.page-faq .faq-hero-unit {
  font-size: .85em;
  color: var(--color-red);
  margin-left: .15em;
}

.page-faq .faq-hero-label {
  font-size: .75rem;
  color: var(--color-silver);
  letter-spacing: .04em;
}

/* ---------- 主内容区 ---------- */
.page-faq .faq-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--content-pad);
  padding-top: clamp(2rem, 5vw, 3.5rem);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.page-faq .faq-main-inner {
  display: grid;
  gap: 2rem;
}

/* ---------- 问题索引（命令栏形态） ---------- */
.page-faq .faq-toc {
  position: relative;
  background: var(--color-white);
  border: 1px solid var(--color-silver);
  padding: 1rem;
  overflow: hidden;
}

.page-faq .faq-toc::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 4px;
  width: 100%;
  background: linear-gradient(90deg, var(--color-red), var(--color-red) 30%, var(--color-blue) 30%, var(--color-blue) 42%, var(--color-silver) 42%);
  pointer-events: none;
}

.page-faq .faq-toc-title {
  margin: 0;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: .875rem;
  color: var(--color-black);
  display: flex;
  align-items: center;
  gap: .5rem;
}

.page-faq .faq-toc-title::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-amber);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(255, 214, 10, .22);
}

.page-faq .faq-toc-sub {
  margin: .35rem 0 .75rem;
  font-size: .75rem;
  color: var(--color-gray);
  letter-spacing: .06em;
}

.page-faq .faq-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  padding-bottom: .25rem;
}

.page-faq .faq-toc-list a {
  display: flex;
  align-items: center;
  gap: .5rem;
  white-space: nowrap;
  color: var(--color-black);
  text-decoration: none;
  font-family: var(--font-ui);
  font-size: .8125rem;
  font-weight: 500;
  padding: .55rem .75rem;
  background: var(--color-white);
  border: 1px solid var(--color-silver);
  scroll-snap-align: start;
  transition: border-color .2s ease, background .2s ease, padding-left .2s ease;
}

.page-faq .faq-toc-list a:hover {
  border-color: var(--color-red);
  background: var(--color-red-tint);
}

.page-faq .faq-toc-num {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--color-red);
  font-size: .75rem;
}

.page-faq .faq-toc-more {
  display: none;
}

/* ---------- 分组与手风琴 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-h) + .75rem);
  margin-bottom: 3rem;
}

.page-faq .faq-group-head {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: 1rem;
  border-left: 6px solid var(--color-red);
  padding-left: 1rem;
}

.page-faq .faq-group-index {
  font-family: var(--font-ui);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: .875rem;
  color: var(--color-red);
}

.page-faq .faq-group-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  color: var(--color-black);
  letter-spacing: -0.01em;
}

.page-faq .faq-list {
  display: grid;
  gap: .75rem;
}

.page-faq .faq-item {
  position: relative;
  background: var(--color-white);
  border: 1px solid var(--color-silver);
  overflow: hidden;
}

.page-faq .faq-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  background: var(--color-red);
  clip-path: polygon(0 0, 100% 0, calc(100% - 28px) 100%, 0 100%);
  transition: height .28s ease;
  z-index: 0;
  pointer-events: none;
}

.page-faq .faq-item[open]::before {
  height: 4px;
}

.page-faq .faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: .85rem;
  padding: 1rem 1.1rem;
  cursor: pointer;
  position: relative;
  z-index: 1;
}

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

.page-faq .faq-item summary:focus-visible {
  box-shadow: inset 0 0 0 2px var(--color-blue);
}

.page-faq .faq-qnum {
  flex-shrink: 0;
  font-family: var(--font-ui);
  font-variant-numeric: tabular-nums;
  font-size: .75rem;
  font-weight: 700;
  color: var(--color-red);
  background: var(--color-red-tint);
  padding: .25rem .5rem;
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 100%, 0 100%);
}

.page-faq .faq-qtext {
  flex: 1;
  font-weight: 600;
  color: var(--color-black);
  font-size: .9375rem;
  line-height: 1.45;
}

.page-faq .faq-qtoggle {
  flex-shrink: 0;
  position: relative;
  width: 16px;
  height: 16px;
}

.page-faq .faq-qtoggle::before,
.page-faq .faq-qtoggle::after {
  content: "";
  position: absolute;
  background: var(--color-gray);
  transition: transform .25s ease, background .25s ease;
}

.page-faq .faq-qtoggle::before {
  top: 7px;
  left: 0;
  width: 16px;
  height: 2px;
}

.page-faq .faq-qtoggle::after {
  top: 0;
  left: 7px;
  width: 2px;
  height: 16px;
}

.page-faq .faq-item[open] .faq-qtoggle::before,
.page-faq .faq-item[open] .faq-qtoggle::after {
  background: var(--color-red);
}

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

/* ---------- 答案卡片 ---------- */
.page-faq .faq-a {
  position: relative;
  z-index: 1;
  margin: 0 1.1rem 1.1rem;
  padding: .9rem 1rem;
  background: var(--color-red-tint);
  border-radius: 0 8px 8px 8px;
  color: #343a40;
  font-size: .9rem;
  line-height: 1.75;
}

.page-faq .faq-a::before {
  content: "答";
  position: absolute;
  top: -1px;
  left: -1px;
  font-family: var(--font-ui);
  font-size: .7rem;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-red);
  padding: .15rem .45rem;
  border-radius: 0 0 6px 0;
}

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

.page-faq .faq-a p + p {
  margin-top: .6rem;
}

.page-faq .faq-inline-link {
  display: inline-block;
  margin-top: .6rem;
  font-weight: 600;
  color: var(--color-red);
  text-decoration: none;
  border-bottom: 2px solid var(--color-red-tint);
  transition: color .2s ease, border-color .2s ease;
}

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

.page-faq .faq-contact-line {
  display: inline-block;
  margin: .15rem 0;
  font-family: var(--font-ui);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--color-black);
  background: var(--color-white);
  border: 1px solid var(--color-silver);
  padding: .25rem .5rem;
}

/* ---------- 图文并置 ---------- */
.page-faq .faq-perf-wrap,
.page-faq .faq-contact-grid {
  display: grid;
  gap: 1.25rem;
}

.page-faq .faq-figure {
  margin: 0;
  padding: .5rem .5rem .4rem;
  background: var(--color-deep);
  align-self: start;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding-top: .5rem;
  font-family: var(--font-ui);
  font-size: .75rem;
  color: var(--color-silver);
}

.page-faq .faq-figure figcaption::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--color-red);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.page-faq .faq-figure-contact {
  background: var(--color-white);
  border: 1px solid var(--color-silver);
}

.page-faq .faq-figure-contact img {
  aspect-ratio: 5 / 3;
}

/* ---------- 桌面端布局 ---------- */
@media (min-width: 820px) {
  .page-faq .faq-hero::before {
    width: 34%;
  }

  .page-faq .faq-hero::after {
    width: 34%;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: 1.15fr .85fr;
    align-items: center;
    gap: 2.5rem;
  }

  .page-faq .faq-main-inner {
    grid-template-columns: var(--faq-sidebar) minmax(0, 1fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: calc(var(--header-h) + 1rem);
    padding: 1.25rem;
  }

  .page-faq .faq-toc-list {
    display: block;
    overflow: visible;
    border-top: 1px solid var(--color-silver);
    margin-top: .75rem;
    padding-bottom: 0;
  }

  .page-faq .faq-toc-list a {
    white-space: normal;
    border: 0;
    border-bottom: 1px solid var(--color-silver);
    padding: .7rem 0;
    background: transparent;
  }

  .page-faq .faq-toc-list a:hover {
    padding-left: .5rem;
  }

  .page-faq .faq-toc-more {
    display: block;
    margin-top: 1.25rem;
  }

  .page-faq .faq-toc-more .btn {
    display: block;
    text-align: center;
  }
}

@media (min-width: 1080px) {
  .page-faq .faq-perf-wrap {
    grid-template-columns: minmax(0, 1fr) 260px;
  }

  .page-faq .faq-contact-grid {
    grid-template-columns: minmax(0, 1fr) 280px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item::before,
  .page-faq .faq-qtoggle::before,
  .page-faq .faq-qtoggle::after {
    transition: none;
  }
}