/* ============================================
   PAGE FAQ · 问答索引
   作用域：.page-faq
   设计方向：操作手册式手风琴 + 左侧章节索引
   ============================================ */

.page-faq {
  --faq-line: rgba(138, 148, 166, 0.24);
  --faq-panel-border: rgba(255, 255, 255, 0.06);
  --faq-cyan-soft: rgba(0, 229, 255, 0.1);
  --faq-corner-cut: 16px;
  position: relative;
  scroll-behavior: smooth;
  background:
    radial-gradient(circle at 92% 8%, rgba(139, 92, 246, 0.08), transparent 340px),
    radial-gradient(circle at 8% 32%, rgba(0, 229, 255, 0.05), transparent 420px);
}

.page-faq .faq-section {
  scroll-margin-top: 150px;
}

/* ========== HERO ========== */

.page-faq .faq-hero {
  position: relative;
  padding: 34px 0 44px;
  border-bottom: 1px solid var(--faq-panel-border);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--purple) 48%, var(--orange));
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(380px, 42%);
  height: 100%;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 16px,
    rgba(0, 229, 255, 0.028) 16px 17px
  );
  pointer-events: none;
}

.page-faq .breadcrumb {
  margin-bottom: 26px;
}

.page-faq .faq-hero-grid {
  display: grid;
  gap: 28px;
  align-items: end;
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 16px;
}

.page-faq .faq-hero-eyebrow-dot {
  width: 8px;
  height: 8px;
  background: var(--orange);
  transform: rotate(45deg);
  display: inline-block;
  box-shadow: 0 0 12px rgba(255, 122, 0, 0.5);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(38px, 7vw, 58px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--text-main);
  margin: 0 0 16px;
}

.page-faq .faq-hero-desc {
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-sub);
  margin: 0;
}

.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: 22px;
}

.page-faq .faq-hero-meta a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  transition: color 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.page-faq .faq-hero-meta a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 13px;
}

.page-faq .faq-hero-meta a:hover {
  color: var(--cyan);
  border-color: var(--orange);
}

/* ========== HERO STATS ========== */

.page-faq .faq-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.page-faq .faq-stat-block {
  background: var(--bg-panel);
  border: 1px solid var(--faq-panel-border);
  padding: 16px 10px;
  text-align: center;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-faq .faq-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-faq .faq-stat-block:nth-child(2) .faq-stat-num {
  color: var(--purple);
}

.page-faq .faq-stat-block:nth-child(3) .faq-stat-num {
  color: var(--orange);
}

.page-faq .faq-stat-label {
  display: block;
  font-size: 13px;
  color: var(--text-sub);
  letter-spacing: 0.08em;
}

/* ========== LAYOUT ========== */

.page-faq .faq-layout {
  display: grid;
  gap: 28px;
  padding: 32px 0 8px;
}

/* ========== INDEX / SIDEBAR ========== */

.page-faq .faq-index-card {
  background: linear-gradient(160deg, rgba(17, 27, 46, 0.95), rgba(17, 27, 46, 0.78));
  border: 1px solid var(--faq-panel-border);
  padding: 20px;
}

.page-faq .faq-index-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-sub);
  margin: 0 0 14px;
}

.page-faq .faq-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.page-faq .faq-index-list li {
  flex-shrink: 0;
}

.page-faq .faq-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 13px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  transition: border-color 0.3s var(--ease-out), background 0.3s var(--ease-out), color 0.3s var(--ease-out);
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  transition: color 0.3s var(--ease-out);
}

.page-faq .faq-index-list a:hover {
  border-color: rgba(0, 229, 255, 0.4);
  background: rgba(0, 229, 255, 0.06);
  color: var(--cyan);
}

.page-faq .faq-index-support {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--faq-line);
}

.page-faq .faq-index-support p {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-sub);
}

/* ========== SECTION HEAD ========== */

.page-faq .faq-section {
  margin-bottom: 44px;
}

.page-faq .faq-section-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(138, 148, 166, 0.18);
  position: relative;
}

.page-faq .faq-section-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-faq .faq-sec-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  opacity: 0.85;
}

.page-faq .faq-section-heading h2 {
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  margin: 0;
  color: var(--text-main);
}

.page-faq .faq-section-heading p {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-sub);
  letter-spacing: 0.04em;
}

/* ========== FAQ LIST / ACCORDION ========== */

.page-faq .faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .faq-item {
  background: linear-gradient(135deg, rgba(17, 27, 46, 0.92), rgba(17, 27, 46, 0.66));
  border: 1px solid var(--faq-panel-border);
  border-left: 3px solid rgba(0, 229, 255, 0.5);
  transition: border-color 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}

.page-faq .faq-item:hover {
  border-color: rgba(0, 229, 255, 0.32);
}

.page-faq .faq-item[open] {
  border-left-color: var(--cyan);
  box-shadow: 0 0 22px rgba(0, 229, 255, 0.05);
}

.page-faq .faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
}

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

.page-faq .faq-q-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  color: var(--cyan);
  opacity: 0.68;
  flex-shrink: 0;
}

.page-faq .faq-q-text {
  flex: 1;
  min-width: 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.5;
}

.page-faq .faq-q-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  padding: 5px 8px;
  color: var(--cyan);
  background: var(--faq-cyan-soft);
  border: 1px solid rgba(0, 229, 255, 0.25);
  flex-shrink: 0;
  white-space: nowrap;
}

.page-faq .faq-q-tag.is-hot {
  color: var(--orange);
  background: rgba(255, 122, 0, 0.07);
  border-color: rgba(255, 122, 0, 0.3);
}

.page-faq .faq-item summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
  flex-shrink: 0;
  transition: color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.page-faq .faq-item[open] summary::after {
  content: "－";
  color: var(--orange);
}

.page-faq .faq-answer {
  padding: 0 18px 18px;
  border-top: 1px dashed rgba(138, 148, 166, 0.22);
  animation: faqDetailIn 0.35s var(--ease-out);
}

@keyframes faqDetailIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-faq .faq-answer p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-sub);
}

.page-faq .faq-answer a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
  transition: color 0.25s var(--ease-out), border-bottom-color 0.25s var(--ease-out);
}

.page-faq .faq-answer a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ========== FIGURE / IMAGE ========== */

.page-faq .faq-figure {
  margin: 22px 0 0;
  background: var(--bg-panel);
  border: 1px solid var(--faq-panel-border);
  position: relative;
}

.page-faq .faq-figure::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 24px 24px 0 0;
  border-color: rgba(0, 229, 255, 0.55) rgba(0, 229, 255, 0.55) transparent transparent;
  z-index: 1;
}

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

.page-faq .faq-figure figcaption {
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-sub);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ========== MORE CARDS ========== */

.page-faq .faq-more {
  display: grid;
  gap: 10px;
  margin: 8px 0 40px;
}

.page-faq .faq-more-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-panel);
  border: 1px solid var(--faq-panel-border);
  border-left: 3px solid var(--purple);
  padding: 16px 18px;
  color: var(--text-main);
  text-decoration: none;
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out), background 0.3s var(--ease-out);
}

.page-faq .faq-more-card:hover {
  border-left-color: var(--cyan);
  transform: translateX(4px);
  background: rgba(17, 27, 46, 0.85);
}

.page-faq .faq-more-title {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  flex-shrink: 0;
}

.page-faq .faq-more-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-sub);
  flex: 1;
  min-width: 0;
}

.page-faq .faq-more-icon {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
  flex-shrink: 0;
}

/* ========== MEDIA QUERIES ========== */

@media (min-width: 720px) {
  .page-faq .faq-hero-grid {
    grid-template-columns: 1fr 260px;
    gap: 40px;
  }

  .page-faq .faq-hero-stats {
    grid-template-columns: 1fr;
  }

  .page-faq .faq-stat-block {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    text-align: left;
    padding: 14px 16px;
  }

  .page-faq .faq-stat-num {
    font-size: 30px;
    margin-bottom: 0;
  }

  .page-faq .faq-stat-label {
    font-size: 13px;
  }

  .page-faq .faq-more {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .page-faq .faq-more-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 20px 18px;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero {
    padding: 44px 0 52px;
  }

  .page-faq .faq-hero-grid {
    grid-template-columns: 1fr 280px;
    gap: 56px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 250px 1fr;
    gap: 40px;
    align-items: start;
    padding: 40px 0 8px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 146px;
  }

  .page-faq .faq-index-list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-index-list a {
    width: 100%;
    display: flex;
    justify-content: flex-start;
    padding: 11px 13px;
    border-left: 2px solid transparent;
  }

  .page-faq .faq-index-list a:hover {
    border-left-color: var(--cyan);
  }

  .page-faq .faq-section {
    margin-bottom: 52px;
  }

  .page-faq .faq-sec-num {
    font-size: 40px;
  }

  .page-faq .faq-section-heading h2 {
    font-size: 30px;
  }
}