/* ===== FAQ 页面专属样式 ===== */

.page-faq {
  background: var(--light-gray);
}

/* 首屏 hero */
.page-faq .page-faq__hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background:
    radial-gradient(circle at 82% 18%, rgba(123, 47, 190, 0.4) 0%, transparent 52%),
    radial-gradient(circle at 8% 100%, rgba(57, 255, 20, 0.12) 0%, transparent 34%),
    linear-gradient(135deg, var(--deep-blue) 0%, #1b2342 100%);
  padding: clamp(48px, 8vw, 88px) 0;
}

.page-faq .page-faq__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(123, 47, 190, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(123, 47, 190, 0.18) 1px, transparent 1px);
  background-size: 42px 42px;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 72%);
  mask-image: linear-gradient(to right, transparent, #000 72%);
  pointer-events: none;
}

.page-faq .page-faq__hero-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.7;
}

.page-faq .page-faq__hero-grid {
  position: relative;
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-faq .page-faq__hero-copy {
  max-width: 640px;
}

.page-faq .page-faq__hero .breadcrumb {
  margin: 0 0 28px;
  font-family: var(--font-mono);
  color: rgba(255, 255, 255, 0.6);
}

.page-faq .page-faq__hero .breadcrumb a {
  color: var(--neon-green);
  text-decoration: none;
}

.page-faq .page-faq__hero .breadcrumb a:hover {
  color: var(--warm-orange);
}

.page-faq .page-faq__hero-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neon-green);
}

.page-faq .page-faq__hero h1 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.05;
  color: var(--white);
}

.page-faq .page-faq__hero-lead {
  margin: 14px 0 18px;
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: rgba(255, 255, 255, 0.92);
}

.page-faq .page-faq__hero-desc {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.78);
  max-width: 560px;
}

.page-faq .page-faq__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-faq .page-faq__hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-faq .page-faq__hero-stats .stat-badge {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--white);
}

.page-faq .page-faq__hero-stats .stat-number {
  color: var(--neon-green);
  font-size: 1.6rem;
}

.page-faq .page-faq__hero-visual {
  position: relative;
}

.page-faq .page-faq__hero-card {
  position: relative;
  margin: 0;
  background: var(--glass-dark);
  border: 1px solid rgba(123, 47, 190, 0.5);
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  transform: rotate(1.2deg);
}

.page-faq .page-faq__hero-card::after {
  content: "";
  position: absolute;
  top: 18px;
  right: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.7);
  animation: page-faq-pulse 2.4s ease-in-out infinite;
}

@keyframes page-faq-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.7);
  }
  70% {
    box-shadow: 0 0 0 12px rgba(57, 255, 20, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0);
  }
}

.page-faq .page-faq__hero-card img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 10px;
  background: linear-gradient(135deg, #1b2342, #0a1128);
}

.page-faq .page-faq__hero-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 0 4px 2px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.64);
}

/* 主体区域 */
.page-faq .page-faq__main {
  padding: 56px 0 72px;
  background: var(--light-gray);
}

.page-faq .page-faq__layout {
  display: grid;
  gap: 40px;
  align-items: start;
}

/* 左侧目录 */
.page-faq .page-faq__toc {
  background: var(--white);
  border: 1px solid rgba(123, 47, 190, 0.22);
  border-left: 4px solid var(--volt-purple);
  border-radius: var(--radius);
  padding: 24px 18px;
}

.page-faq .page-faq__toc-label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid-gray);
}

.page-faq .page-faq__toc-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.page-faq .page-faq__toc-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 8px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--dark-gray);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.page-faq .page-faq__toc-link:hover {
  background: rgba(123, 47, 190, 0.07);
  color: var(--volt-purple);
}

.page-faq .page-faq__toc-note {
  margin-top: 24px;
  padding: 16px;
  background: var(--light-gray);
  border-radius: 8px;
  font-size: 0.875rem;
}

.page-faq .page-faq__toc-note p {
  margin: 0 0 6px;
  color: var(--mid-gray);
}

.page-faq .page-faq__toc-note a {
  color: var(--warm-orange);
  font-weight: 600;
  text-decoration: none;
}

.page-faq .page-faq__toc-note a:hover {
  text-decoration: underline;
}

/* 右侧内容 */
.page-faq .page-faq__content {
  min-width: 0;
}

.page-faq .page-faq__section-tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--volt-purple);
}

.page-faq .page-faq__section-desc {
  margin: 0 0 8px;
  max-width: 640px;
  line-height: 1.6;
  color: var(--mid-gray);
}

.page-faq .page-faq__content > h2,
.page-faq .page-faq__feedback h2 {
  margin: 8px 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  color: var(--deep-blue);
}

/* 分类 */
.page-faq .page-faq__category {
  scroll-margin-top: calc(var(--header-height) + 20px);
  margin-top: 36px;
}

.page-faq .page-faq__category-title {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 2px dashed rgba(123, 47, 190, 0.3);
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--deep-blue);
}

.page-faq .page-faq__category-title::before {
  content: "▍";
  color: var(--volt-purple);
}

.page-faq .page-faq__category:target .page-faq__category-title {
  padding-left: 12px;
  border-bottom-color: var(--volt-purple);
  background: var(--white);
}

/* 手风琴 */
.page-faq .page-faq__item {
  display: grid;
  grid-template-rows: auto 0fr;
  background: var(--white);
  border: 1px solid rgba(123, 47, 190, 0.18);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), grid-template-rows 300ms ease;
}

.page-faq .page-faq__item[open] {
  grid-template-rows: auto 1fr;
  border-color: var(--volt-purple);
  box-shadow: 0 10px 30px rgba(10, 17, 40, 0.08);
}

.page-faq .page-faq__item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  font-weight: 600;
  color: var(--dark-gray);
  transition: background var(--transition);
}

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

.page-faq .page-faq__item summary:hover {
  background: linear-gradient(90deg, rgba(123, 47, 190, 0.05), transparent 80%);
}

.page-faq .page-faq__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--volt-purple);
  transition: transform 300ms ease;
}

.page-faq .page-faq__item[open] summary::after {
  transform: rotate(45deg);
}

.page-faq .page-faq__item-icon {
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: rgba(123, 47, 190, 0.08);
  color: var(--volt-purple);
}

.page-faq .page-faq__item-icon svg {
  width: 16px;
  height: 16px;
}

.page-faq .page-faq__answer {
  overflow: hidden;
  min-height: 0;
  padding: 0 20px 20px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--mid-gray);
}

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

.page-faq .page-faq__answer a {
  color: var(--volt-purple);
  font-weight: 600;
}

.page-faq .page-faq__main,
.page-faq .page-faq__tutorial,
.page-faq .page-faq__feedback {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 教程 */
.page-faq .page-faq__tutorial {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 85% 20%, rgba(123, 47, 190, 0.3), transparent 46%),
    linear-gradient(135deg, #0a1128 0%, #1b2342 100%);
  color: var(--white);
  padding: 64px 0;
}

.page-faq .page-faq__tutorial-shell {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-faq .page-faq__section-tag--light {
  color: var(--neon-green);
}

.page-faq .page-faq__section-desc--light {
  color: rgba(255, 255, 255, 0.68);
}

.page-faq .page-faq__tutorial h2 {
  margin: 8px 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  color: var(--white);
}

.page-faq .page-faq__steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .page-faq__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 18px;
  transition: background 200ms ease, border-color 200ms ease, transform 200ms ease;
}

.page-faq .page-faq__step:hover,
.page-faq .page-faq__step:focus-within {
  background: rgba(123, 47, 190, 0.16);
  border-color: rgba(57, 255, 20, 0.45);
  transform: translateX(4px);
}

.page-faq .page-faq__step-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--neon-green);
}

.page-faq .page-faq__step-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--white);
}

.page-faq .page-faq__step-body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.72);
}

.page-faq .page-faq__step-tip {
  display: inline-block;
  margin-top: 10px;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--neon-green);
  background: rgba(57, 255, 20, 0.08);
  border-radius: 6px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 300ms ease, opacity 300ms ease;
}

.page-faq .page-faq__step:hover .page-faq__step-tip,
.page-faq .page-faq__step:focus-within .page-faq__step-tip {
  max-height: 64px;
  opacity: 1;
}

.page-faq .page-faq__tutorial-media {
  position: relative;
  margin: 0;
}

.page-faq .page-faq__tutorial-media::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  right: 14px;
  bottom: -14px;
  border: 2px solid rgba(123, 47, 190, 0.35);
  border-radius: var(--radius);
  pointer-events: none;
}

.page-faq .page-faq__tutorial-media img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid rgba(123, 47, 190, 0.4);
  box-shadow: 0 0 40px rgba(123, 47, 190, 0.28);
  background: linear-gradient(135deg, #1b2342, #0a1128);
}

/* 反馈 */
.page-faq .page-faq__feedback {
  background: var(--white);
  padding: 64px 0;
}

.page-faq .page-faq__feedback-shell {
  display: grid;
  gap: 40px;
  align-items: start;
}

.page-faq .page-faq__feedback-copy p {
  margin: 0 0 20px;
  max-width: 560px;
  line-height: 1.7;
  color: var(--mid-gray);
}

.page-faq .page-faq__feedback-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .page-faq__feedback-contact {
  background: var(--light-gray);
  border: 1px solid rgba(123, 47, 190, 0.2);
  border-radius: 16px;
  padding: 32px;
}

.page-faq .page-faq__feedback-contact h3 {
  margin: 0 0 20px;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--deep-blue);
}

.page-faq .page-faq__feedback-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-faq .page-faq__feedback-contact .contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* 桌面端布局 */
@media (min-width: 900px) {
  .page-faq .page-faq__hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
  }

  .page-faq .page-faq__hero-visual {
    padding-left: 24px;
  }

  .page-faq .page-faq__main {
    padding: 72px 0 88px;
  }

  .page-faq .page-faq__layout {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 64px;
  }

  .page-faq .page-faq__toc {
    position: sticky;
    top: calc(var(--header-height) + 24px);
  }

  .page-faq .page-faq__toc-nav {
    display: block;
  }

  .page-faq .page-faq__tutorial,
  .page-faq .page-faq__feedback {
    padding: 80px 0;
  }

  .page-faq .page-faq__tutorial-shell {
    grid-template-columns: 1fr 0.9fr;
    gap: 64px;
  }

  .page-faq .page-faq__feedback-shell {
    grid-template-columns: 1fr 0.9fr;
    gap: 64px;
  }
}

/* 减少动效 */
@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .page-faq .page-faq__step-tip {
    max-height: none;
    opacity: 1;
  }
}