.page-faq {
  --faq-cat-blue: var(--primary, #00BFFF);
  --faq-cat-orange: var(--accent, #FF4500);
  --faq-cat-teal: #20B2AA;
  --faq-cat-purple: #9370DB;
  --faq-cat-blue-bg: rgba(0, 191, 255, 0.08);
  --faq-cat-orange-bg: rgba(255, 69, 0, 0.08);
  --faq-cat-teal-bg: rgba(32, 178, 170, 0.08);
  --faq-cat-purple-bg: rgba(147, 112, 219, 0.08);
  --faq-accordion-radius: var(--radius-md, 8px);
  --faq-gap: 16px;
}

/* ── Hero ────────────────────────────── */
.page-faq .faq-hero {
  background: var(--bg-dark, #1A1A2E);
  padding: 40px 0 32px;
  color: var(--text-light, #F0F0F0);
}
.page-faq .faq-hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.page-faq .faq-hero__text {
  flex: 1 1 100%;
  text-align: center;
}
.page-faq .faq-hero h1 {
  font-family: var(--font-heading, 'Roboto Condensed', sans-serif);
  font-weight: 700;
  font-style: italic;
  font-size: 2.2rem;
  line-height: 1.2;
  margin: 0 0 8px;
  color: var(--primary, #00BFFF);
  letter-spacing: 0.02em;
}
.page-faq .faq-hero__sub {
  font-size: 1.05rem;
  color: var(--text-muted, #A0A0A0);
  margin: 0;
  max-width: 480px;
}
.page-faq .faq-hero__visual {
  flex: 0 0 auto;
  max-width: 100%;
}
.page-faq .faq-hero__visual img {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--radius-md, 8px);
  box-shadow: var(--shadow-lg, 0 12px 40px rgba(0,0,0,0.18));
}

/* ── Breadcrumb ──────────────────────── */
.page-faq .breadcrumb {
  padding: 16px 0 8px;
  font-size: 0.85rem;
  color: var(--text-secondary, #6B6B6B);
  font-family: var(--font-mono, 'Fira Code', monospace);
}
.page-faq .breadcrumb a {
  color: var(--primary, #00BFFF);
  text-decoration: none;
  transition: color var(--transition, 0.25s ease);
}
.page-faq .breadcrumb a:hover,
.page-faq .breadcrumb a:focus-visible {
  color: var(--accent, #FF4500);
  outline: 2px solid var(--accent, #FF4500);
  outline-offset: 2px;
}

/* ── FAQ Main ─────────────────────────── */
.page-faq .faq-main {
  display: flex;
  flex-direction: column;
  gap: var(--faq-gap);
  padding: 24px 0 16px;
  position: relative;
}

/* radio hidden */
.page-faq .faq-radio {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

/* ── Categories ───────────────────────── */
.page-faq .faq-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  flex-shrink: 0;
}
.page-faq .faq-cat-label {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-family: var(--font-heading, 'Roboto Condensed', sans-serif);
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-md, 8px);
  cursor: pointer;
  transition: background var(--transition, 0.25s ease), color var(--transition, 0.25s ease), box-shadow var(--transition, 0.25s ease);
  border: 2px solid transparent;
  user-select: none;
}
.page-faq .faq-cat-label:focus-visible {
  outline: 2px solid var(--accent, #FF4500);
  outline-offset: 2px;
}

/* 分类颜色默认态 */
.page-faq .faq-cat-label[data-color="blue"] {
  background: var(--faq-cat-blue-bg);
  color: var(--faq-cat-blue);
  border-color: var(--faq-cat-blue);
}
.page-faq .faq-cat-label[data-color="orange"] {
  background: var(--faq-cat-orange-bg);
  color: var(--faq-cat-orange);
  border-color: var(--faq-cat-orange);
}
.page-faq .faq-cat-label[data-color="teal"] {
  background: var(--faq-cat-teal-bg);
  color: var(--faq-cat-teal);
  border-color: var(--faq-cat-teal);
}
.page-faq .faq-cat-label[data-color="purple"] {
  background: var(--faq-cat-purple-bg);
  color: var(--faq-cat-purple);
  border-color: var(--faq-cat-purple);
}

/* 分类悬停 */
.page-faq .faq-cat-label:hover {
  filter: brightness(1.1);
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
}

/* ── 选中态 ───────────────────────────── */
#cat-terms:checked ~ .faq-categories label[for="cat-terms"],
#cat-video:checked ~ .faq-categories label[for="cat-video"],
#cat-nav:checked ~ .faq-categories label[for="cat-nav"],
#cat-app:checked ~ .faq-categories label[for="cat-app"] {
  color: #fff;
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
  transform: scale(1.03);
}
#cat-terms:checked ~ .faq-categories label[for="cat-terms"] {
  background: var(--faq-cat-blue);
  border-color: var(--faq-cat-blue);
}
#cat-video:checked ~ .faq-categories label[for="cat-video"] {
  background: var(--faq-cat-orange);
  border-color: var(--faq-cat-orange);
}
#cat-nav:checked ~ .faq-categories label[for="cat-nav"] {
  background: var(--faq-cat-teal);
  border-color: var(--faq-cat-teal);
}
#cat-app:checked ~ .faq-categories label[for="cat-app"] {
  background: var(--faq-cat-purple);
  border-color: var(--faq-cat-purple);
}

/* ── Groups ────────────────────────────── */
.page-faq .faq-groups {
  flex: 1 1 100%;
  min-width: 0;
}
.page-faq .faq-group {
  display: none;
  animation: faqFadeIn 0.35s ease;
}
@keyframes faqFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
#cat-terms:checked ~ .faq-groups [data-group="terms"],
#cat-video:checked ~ .faq-groups [data-group="video"],
#cat-nav:checked ~ .faq-groups [data-group="nav"],
#cat-app:checked ~ .faq-groups [data-group="app"] {
  display: block;
}

/* ── Accordion ─────────────────────────── */
.page-faq .accordion-item {
  background: var(--surface, #FFFFFF);
  border: 1px solid var(--border-color, #DDE0E4);
  border-radius: var(--faq-accordion-radius);
  margin-bottom: 10px;
  overflow: hidden;
  transition: box-shadow var(--transition, 0.25s ease);
}
.page-faq .accordion-item:hover {
  box-shadow: var(--shadow-sm, 0 2px 8px rgba(0,0,0,0.08));
}
.page-faq .accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  font-family: var(--font-body, 'Open Sans', sans-serif);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary, #222222);
  cursor: pointer;
  list-style: none;
  transition: background var(--transition, 0.25s ease), color var(--transition, 0.25s ease);
  user-select: none;
}
.page-faq .accordion-header::-webkit-details-marker {
  display: none;
}
.page-faq .accordion-header::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--text-secondary, #6B6B6B);
  margin-left: 12px;
  transition: transform var(--transition, 0.25s ease), color var(--transition, 0.25s ease);
  flex-shrink: 0;
}
.page-faq .accordion-item[open] .accordion-header::after {
  transform: rotate(45deg);
  color: var(--primary, #00BFFF);
}
.page-faq .accordion-item[open] .accordion-header {
  background: rgba(0, 191, 255, 0.04);
  color: var(--primary-dark, #009ACD);
  border-bottom: 1px solid var(--border-color, #DDE0E4);
}
.page-faq .accordion-body {
  padding: 0 18px 14px;
  background: linear-gradient(135deg, rgba(0,191,255,0.03), rgba(255,69,0,0.03));
  transition: background var(--transition, 0.25s ease);
}
.page-faq .accordion-item[open] .accordion-body {
  background: linear-gradient(135deg, rgba(0,191,255,0.07), rgba(255,69,0,0.05));
}
.page-faq .accordion-body p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary, #6B6B6B);
}

/* ── Banner ────────────────────────────── */
.page-faq .faq-banner {
  padding: 8px 0 24px;
}
.page-faq .faq-banner__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md, 8px);
  box-shadow: var(--shadow-sm, 0 2px 8px rgba(0,0,0,0.08));
}

/* ── Contact ───────────────────────────── */
.page-faq .faq-contact {
  background: var(--bg-dark, #1A1A2E);
  color: var(--text-light, #F0F0F0);
  padding: 48px 0 56px;
}
.page-faq .faq-contact__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}
.page-faq .faq-contact__text {
  flex: 1 1 100%;
  text-align: center;
}
.page-faq .faq-contact__title {
  font-family: var(--font-heading, 'Roboto Condensed', sans-serif);
  font-weight: 700;
  font-style: italic;
  font-size: 1.6rem;
  margin: 0 0 8px;
  color: var(--primary, #00BFFF);
}
.page-faq .faq-contact__desc {
  font-size: 1rem;
  margin: 0 0 20px;
  color: var(--text-muted, #A0A0A0);
}
.page-faq .faq-contact .btn--accent {
  display: inline-block;
  background: var(--accent, #FF4500);
  color: #fff;
  padding: 12px 32px;
  border-radius: var(--radius-md, 8px);
  font-family: var(--font-heading, 'Roboto Condensed', sans-serif);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  transition: background var(--transition, 0.25s ease), transform var(--transition, 0.25s ease);
  border: none;
  cursor: pointer;
}
.page-faq .faq-contact .btn--accent:hover,
.page-faq .faq-contact .btn--accent:focus-visible {
  background: var(--accent-dark, #DC143C);
  transform: translateY(-2px);
  outline: 2px solid var(--primary, #00BFFF);
  outline-offset: 2px;
}
.page-faq .faq-contact__note {
  font-size: 0.85rem;
  color: var(--text-muted, #A0A0A0);
  margin: 16px 0 0;
}
.page-faq .faq-contact__privacy {
  font-size: 0.85rem;
  margin: 8px 0 0;
}
.page-faq .faq-contact__privacy a {
  color: var(--primary, #00BFFF);
  text-decoration: none;
  transition: color var(--transition, 0.25s ease);
}
.page-faq .faq-contact__privacy a:hover,
.page-faq .faq-contact__privacy a:focus-visible {
  color: var(--accent, #FF4500);
  outline: 2px solid var(--accent, #FF4500);
  outline-offset: 2px;
}
.page-faq .faq-contact__visual {
  flex: 0 0 auto;
  max-width: 100%;
}
.page-faq .faq-contact__visual img {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--radius-md, 8px);
  box-shadow: var(--shadow-lg, 0 12px 40px rgba(0,0,0,0.18));
}

/* ── Tablet+ ───────────────────────────── */
@media (min-width: 768px) {
  .page-faq .faq-hero {
    padding: 56px 0 40px;
  }
  .page-faq .faq-hero__inner {
    flex-direction: row;
    text-align: left;
    justify-content: space-between;
  }
  .page-faq .faq-hero__text {
    text-align: left;
  }
  .page-faq .faq-hero h1 {
    font-size: 2.8rem;
  }
  .page-faq .faq-hero__sub {
    font-size: 1.1rem;
  }

  .page-faq .faq-main {
    flex-direction: row;
    gap: 28px;
    padding: 32px 0 24px;
  }
  .page-faq .faq-categories {
    flex-direction: column;
    min-width: 190px;
    max-width: 220px;
    gap: 8px;
  }
  .page-faq .faq-cat-label {
    width: 100%;
    padding: 12px 20px;
    font-size: 1rem;
  }
  .page-faq .faq-groups {
    flex: 1 1 0;
  }

  .page-faq .faq-contact__inner {
    flex-direction: row;
    text-align: left;
    align-items: center;
  }
  .page-faq .faq-contact__text {
    text-align: left;
  }
  .page-faq .faq-contact__title {
    font-size: 1.9rem;
  }

  .page-faq .faq-banner__img {
    max-height: 240px;
    object-fit: cover;
  }
}

/* ── Desktop ───────────────────────────── */
@media (min-width: 1024px) {
  .page-faq .faq-hero {
    padding: 72px 0 48px;
  }
  .page-faq .faq-hero h1 {
    font-size: 3.2rem;
  }
  .page-faq .faq-categories {
    min-width: 220px;
    max-width: 260px;
  }
  .page-faq .faq-contact__title {
    font-size: 2.2rem;
  }
}