/* ===== 页面专属样式 .page-faq ===== */
.page-faq {
  --faq-gap: 2rem;
  --faq-item-radius: 6px;
  --faq-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  color: var(--color-neutral-dark);
  background: var(--color-white);
}

/* ---------- 辅助类 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ---------- Hero 区域 ---------- */
.faq-hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  overflow: hidden;
  padding: 3rem 0 2.5rem;
  margin-top: calc(-1 * var(--header-height));
  padding-top: calc(var(--header-height) + 2rem);
}

.faq-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
}

.faq-hero__overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 40%, rgba(255, 102, 0, 0.12) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
}

.faq-hero__inner {
  position: relative;
  z-index: 2;
}

.faq-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.faq-breadcrumb a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.faq-breadcrumb a:hover,
.faq-breadcrumb a:focus {
  border-bottom-color: var(--color-accent);
}

.faq-breadcrumb__sep {
  color: rgba(255, 255, 255, 0.4);
}

.faq-hero__title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(2.2rem, 6vw, 4rem);
  color: var(--color-white);
  margin: 0 0 0.75rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.faq-hero__desc {
  font-size: 1.05rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  max-width: 680px;
  margin: 0 0 1.5rem;
}

.faq-hero__search {
  position: relative;
  max-width: 480px;
}

.faq-hero__input {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.6rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--faq-item-radius);
  outline: none;
  transition: background 0.3s, border-color 0.3s;
  backdrop-filter: blur(4px);
}

.faq-hero__input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.faq-hero__input:focus {
  background: rgba(255, 255, 255, 0.2);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 102, 0, 0.3);
}

.faq-hero__input-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  color: rgba(255, 255, 255, 0.5);
  pointer-events: none;
  line-height: 1;
}

/* ---------- 快速索引卡片 ---------- */
.faq-index {
  padding: 0 1rem 2rem;
  margin-top: -1rem;
}

.faq-index__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.faq-index__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.25rem 0.75rem;
  background: var(--color-neutral-light);
  border-radius: var(--faq-item-radius);
  text-decoration: none;
  color: var(--color-neutral-dark);
  transition: background 0.3s, transform 0.25s, box-shadow 0.3s;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.faq-index__card:hover,
.faq-index__card:focus {
  background: var(--color-white);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 85, 164, 0.12);
}

.faq-index__num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.faq-index__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-neutral-dark);
  letter-spacing: 0.04em;
}

/* ---------- 问题分组 ---------- */
.faq-sections {
  padding: 0 1rem 3rem;
}

.faq-group {
  margin-bottom: 2.5rem;
}

.faq-group:last-child {
  margin-bottom: 0;
}

.faq-group__heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-style: italic;
  font-size: 1.6rem;
  color: var(--color-neutral-dark);
  margin: 0 0 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--color-neutral-light);
}

.faq-group__num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(255, 102, 0, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

/* ---------- 折叠面板 ---------- */
.faq-group__items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.faq-item {
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--faq-item-radius);
  background: var(--color-white);
  overflow: hidden;
  transition: box-shadow 0.3s;
}

.faq-item:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.faq-item__toggle {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 1.25rem;
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-neutral-dark);
  text-align: left;
  transition: background 0.25s, color 0.25s;
  position: relative;
}

.faq-item__toggle:hover {
  background: var(--color-neutral-light);
}

.faq-item__toggle:focus {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--color-primary);
}

.faq-item__index {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(0, 85, 164, 0.06);
  border-radius: 4px;
  transition: background 0.25s, color 0.25s;
}

.faq-item__toggle[aria-expanded="true"] .faq-item__index {
  background: var(--color-primary);
  color: var(--color-white);
}

.faq-item__question {
  flex: 1;
  font-weight: 500;
  line-height: 1.4;
  padding-right: 0.5rem;
}

.faq-item__icon {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--color-primary);
  transition: transform 0.35s ease;
  line-height: 1;
}

.faq-item__toggle[aria-expanded="true"] .faq-item__icon {
  transform: rotate(45deg);
  color: var(--color-accent);
}

.faq-item__content {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--faq-transition);
}

.faq-item__content[aria-hidden="false"] {
  grid-template-rows: 1fr;
}

.faq-item__body {
  overflow: hidden;
  padding: 0 1.25rem 0 3.75rem;
  color: var(--color-neutral-dark);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item__body p {
  margin: 0 0 0.6rem;
}

.faq-item__body p:last-child {
  margin-bottom: 0;
}

.faq-item__link {
  display: inline-block;
  margin-top: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.faq-item__link:hover,
.faq-item__link:focus {
  border-bottom-color: var(--color-accent);
}

/* ---------- CTA 区域 ---------- */
.faq-cta {
  padding: 0 1rem 3.5rem;
}

.faq-cta__inner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 8px;
  padding: 2.5rem 2rem;
  text-align: center;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.faq-cta__inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 80% 60%, rgba(255, 102, 0, 0.1) 0%, transparent 60%);
  pointer-events: none;
}

.faq-cta__title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-style: italic;
  font-size: 1.6rem;
  margin: 0 0 0.5rem;
  position: relative;
}

.faq-cta__text {
  font-size: 1rem;
  max-width: 500px;
  margin: 0 auto 1.25rem;
  opacity: 0.85;
  position: relative;
}

.faq-cta__contacts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  opacity: 0.9;
  margin-bottom: 0.75rem;
  position: relative;
}

.faq-cta__contact-item {
  white-space: nowrap;
}

.faq-cta__note {
  font-size: 0.8rem;
  opacity: 0.6;
  margin: 0 0 1.25rem;
  position: relative;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.faq-cta__btn {
  display: inline-block;
  padding: 0.65rem 1.75rem;
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--faq-item-radius);
  transition: background 0.3s, transform 0.25s;
  position: relative;
}

.faq-cta__btn:hover,
.faq-cta__btn:focus {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
}

/* ===== 响应式：窄屏 ===== */
@media (max-width: 768px) {
  .faq-hero {
    padding: calc(var(--header-height) + 1.5rem) 1rem 1.5rem;
  }

  .faq-hero__title {
    font-size: 1.8rem;
  }

  .faq-hero__desc {
    font-size: 0.95rem;
  }

  .faq-index__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .faq-index__card {
    padding: 0.9rem 0.5rem;
  }

  .faq-index__num {
    font-size: 1.2rem;
  }

  .faq-group__heading {
    font-size: 1.3rem;
  }

  .faq-item__toggle {
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
  }

  .faq-item__index {
    width: 1.6rem;
    height: 1.6rem;
    font-size: 0.75rem;
  }

  .faq-item__body {
    padding: 0 1rem 0.75rem 2.75rem;
    font-size: 0.9rem;
  }

  .faq-cta__inner {
    padding: 1.75rem 1.25rem;
  }

  .faq-cta__contacts {
    flex-direction: column;
    gap: 0.3rem;
    font-size: 0.8rem;
    white-space: normal;
  }

  .faq-cta__contact-item {
    white-space: normal;
  }

  .faq-sections {
    padding: 0 0.5rem 2rem;
  }

  .faq-index {
    padding: 0 0.5rem 1.5rem;
  }

  .faq-cta {
    padding: 0 0.5rem 2.5rem;
  }
}

/* ===== 响应式：大屏微调 ===== */
@media (min-width: 1200px) {
  .faq-hero {
    padding: calc(var(--header-height) + 3.5rem) 0 3rem;
  }

  .faq-hero__title {
    font-size: 4rem;
  }

  .faq-group__heading {
    font-size: 1.8rem;
  }

  .faq-item__toggle {
    padding: 1.15rem 1.5rem;
  }

  .faq-cta__inner {
    padding: 3rem 3.5rem;
  }
}