.page-faq {
  --faq-red: #C8102E;
  --faq-gold: #D4AF37;
  --faq-carbon: #252525;
  --faq-rule: #2E2E2E;
}

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

/* ===== 首屏横幅 ===== */
.page-faq__hero {
  position: relative;
  background: linear-gradient(135deg, var(--c-black) 0%, var(--c-carbon) 65%, var(--c-red) 135%);
  color: var(--c-white);
  overflow: hidden;
  padding-top: 2.25rem;
  padding-bottom: 3.5rem;
}

.page-faq__hero-big {
  position: absolute;
  top: 0.25rem;
  left: -0.35rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(5.5rem, 18vw, 14rem);
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: rgba(200, 16, 46, 0.28);
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.page-faq__hero-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  z-index: 0;
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, rgba(26, 26, 26, 0.96) 20%, rgba(26, 26, 26, 0.72) 55%, rgba(26, 26, 26, 0.4) 100%);
  z-index: 0;
}

.page-faq__hero-wrap {
  position: relative;
  z-index: 1;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.page-faq__hero-content {
  max-width: 640px;
  padding-top: 1.5rem;
}

.page-faq__hero-title {
  margin-top: 1rem;
  margin-bottom: 0.75rem;
  font-size: clamp(2.5rem, 6.5vw, 4.25rem);
  line-height: 1.1;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.35);
  color: var(--c-white);
}

.page-faq__hero-lead {
  max-width: 540px;
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
}

/* ===== FAQ 主体 ===== */
.page-faq__faq {
  background: var(--c-mist);
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.page-faq__faq-heading {
  max-width: 680px;
  margin: 0 auto 2.75rem;
  text-align: center;
  position: relative;
  padding-bottom: 1.25rem;
}

.page-faq__faq-heading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 4px;
  background: var(--faq-red);
}

.page-faq__faq-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  margin: 0;
  color: var(--c-black);
}

.page-faq__faq-lead {
  margin: 0.75rem 0 0;
  color: var(--c-graphite);
  font-family: var(--font-body);
  font-size: 0.9375rem;
}

.page-faq__tabs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

/* ===== 分类标签列表 ===== */
.page-faq__tab-list {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 0.5rem;
  padding-bottom: 0.5rem;
  -webkit-overflow-scrolling: touch;
}

.page-faq__tab-btn {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  min-width: max-content;
  padding: 0.75rem 1.125rem;
  background: var(--c-white);
  border: 1px solid var(--c-rule);
  border-left: 4px solid var(--c-rule);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-graphite);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-faq__tab-btn:hover,
.page-faq__tab-btn:focus-visible {
  background: var(--c-carbon);
  color: var(--c-white);
  border-left-color: var(--faq-red);
  transform: translateY(-2px);
}

.page-faq__tab-btn[aria-selected="true"] {
  background: var(--faq-red);
  border-color: var(--faq-red);
  border-left-color: var(--faq-red);
  color: var(--c-white);
  box-shadow: 0 8px 20px rgba(200, 16, 46, 0.22);
}

.page-faq__tab-btn[aria-selected="true"] .page-faq__tab-count {
  background: var(--c-white);
  color: var(--faq-red);
}

.page-faq__tab-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  opacity: 0.75;
}

.page-faq__tab-count {
  margin-left: 0.25rem;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  background: var(--c-mist);
  color: var(--c-graphite);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
}

/* ===== 标签面板 ===== */
.page-faq__tab-panels {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-faq__panel {
  background: var(--c-white);
  border: 1px solid var(--c-rule);
  border-top: 4px solid var(--faq-red);
  padding: 1.5rem;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.06);
}

.page-faq__panel-head {
  border-bottom: 2px solid var(--c-mist);
  margin-bottom: 1.25rem;
  padding-bottom: 0.875rem;
}

.page-faq__panel-head h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  margin: 0;
  color: var(--c-black);
}

.page-faq__panel-head p {
  margin: 0.3rem 0 0;
  color: var(--c-muted);
  font-family: var(--font-body);
  font-size: 0.8125rem;
}

.page-faq__accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* ===== 手风琴条目 ===== */
.page-faq__item {
  background: var(--c-white);
  border: 1px solid var(--c-rule);
  border-left: 4px solid var(--faq-red);
  transition: box-shadow 0.2s ease;
}

.page-faq__item[open] {
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.page-faq__item summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem 0.875rem 0.875rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1.4;
  color: var(--c-black);
  transition: background 0.2s ease;
}

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

.page-faq__item summary:hover {
  background: rgba(245, 245, 245, 0.6);
}

.page-faq__dot {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--faq-red);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-faq__q {
  flex: 1;
  min-width: 0;
}

.page-faq__mark {
  position: relative;
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
  margin-left: auto;
}

.page-faq__mark::before,
.page-faq__mark::after {
  content: "";
  position: absolute;
  background: var(--faq-red);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.page-faq__mark::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  transform: translateY(-50%);
}

.page-faq__mark::after {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
}

.page-faq__item[open] .page-faq__mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq__answer {
  padding: 0 1.25rem 1.25rem 3.625rem;
  color: var(--c-graphite);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-faq__answer p {
  margin: 0 0 0.75rem;
}

.page-faq__answer p:last-child {
  margin-bottom: 0;
}

.page-faq__answer a {
  color: var(--c-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.page-faq__answer a:hover,
.page-faq__answer a:focus-visible {
  color: var(--faq-red);
}

/* ===== 联系支持区 ===== */
.page-faq__contact {
  background: var(--c-black);
  color: var(--c-white);
  border-top: 5px solid var(--faq-gold);
}

.page-faq__contact-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-top: 3rem;
  padding-bottom: 3.5rem;
}

.page-faq__contact-media {
  flex-shrink: 0;
}

.page-faq__contact-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.page-faq__contact-body {
  max-width: 560px;
}

.page-faq__contact-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  margin: 0.75rem 0 1rem;
  color: var(--c-white);
}

.page-faq__contact-note {
  color: rgba(255, 255, 255, 0.82);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  margin: 0 0 1.5rem;
}

.page-faq__contact-note a {
  color: var(--c-sky);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.page-faq__contact-note a:hover,
.page-faq__contact-note a:focus-visible {
  color: var(--faq-gold);
}

.page-faq__contact-btn {
  display: inline-block;
  text-decoration: none;
}

/* ===== 桌面端适配 ===== */
@media (min-width: 768px) {
  .page-faq__hero {
    padding-top: 3rem;
    padding-bottom: 4.5rem;
  }

  .page-faq__hero-big {
    font-size: clamp(8rem, 16vw, 15rem);
    top: 0;
    left: 0;
  }

  .page-faq__hero-img {
    width: 62%;
    left: 38%;
    opacity: 0.34;
  }

  .page-faq__hero-wrap {
    padding-top: 2rem;
  }

  .page-faq__hero-content {
    padding-top: 2.5rem;
    max-width: 720px;
  }

  .page-faq__hero-lead {
    font-size: 1.125rem;
  }

  .page-faq__faq {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }

  .page-faq__faq-heading {
    margin-bottom: 3.25rem;
  }

  .page-faq__tabs {
    grid-template-columns: 280px 1fr;
    gap: 0;
    align-items: stretch;
  }

  .page-faq__tab-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-right: 1px solid var(--c-rule);
    background: transparent;
  }

  .page-faq__tab-btn {
    width: 100%;
    min-width: 0;
    justify-content: flex-start;
    padding: 1rem 1.25rem;
    border: none;
    border-bottom: 1px solid var(--c-rule);
    border-left: 4px solid transparent;
    border-radius: 0;
    background: var(--c-mist);
    font-size: 1rem;
    transition: background 0.2s ease, color 0.2s ease, border-left-color 0.2s ease;
  }

  .page-faq__tab-btn:hover,
  .page-faq__tab-btn:focus-visible {
    background: var(--c-carbon);
    color: var(--c-white);
    border-left-color: var(--faq-red);
    transform: none;
  }

  .page-faq__tab-btn[aria-selected="true"] {
    background: var(--c-white);
    border-left-color: var(--faq-red);
    border-bottom-color: var(--c-rule);
    color: var(--c-black);
    box-shadow: none;
    font-weight: 700;
  }

  .page-faq__tab-btn[aria-selected="true"] .page-faq__tab-count {
    background: var(--faq-red);
    color: var(--c-white);
  }

  .page-faq__tab-count {
    margin-left: auto;
  }

  .page-faq__tab-panels {
    gap: 0;
  }

  .page-faq__panel {
    margin-left: -1px;
    padding: 2.25rem 2.5rem;
    border-top: 1px solid var(--c-rule);
    border-left: none;
    min-height: 520px;
  }

  .page-faq__panel + .page-faq__panel {
    border-top-width: 1px;
  }

  .page-faq__item summary {
    padding: 1.125rem 1.25rem 1.125rem 1rem;
    font-size: 1rem;
  }

  .page-faq__answer {
    padding: 0 1.5rem 1.5rem 4rem;
    font-size: 1rem;
  }

  .page-faq__contact-inner {
    flex-direction: row;
    align-items: center;
    gap: 4rem;
    padding-top: 4rem;
    padding-bottom: 4.5rem;
  }

  .page-faq__contact-media img {
    width: 400px;
    height: 300px;
  }
}

@media (min-width: 1100px) {
  .page-faq__hero-big {
    font-size: 16rem;
  }

  .page-faq__tabs {
    grid-template-columns: 300px 1fr;
  }
}