.page-faq {
  --qa-bg: rgba(26, 14, 46, 0.55);
  --qa-bg-open: rgba(26, 14, 46, 0.94);
  --faq-text: rgba(243, 233, 215, 0.72);
  --faq-text-dim: rgba(243, 233, 215, 0.56);
  color: var(--paper);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

/* ---------- hero ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(1.8rem, 5vw, 4rem) 0 clamp(1.6rem, 4vw, 2.8rem);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(115deg, rgba(38, 247, 227, 0.07) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(25deg, rgba(243, 233, 215, 0.045) 0 1px, transparent 1px 72px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 82%);
}

.page-faq .faq-hero .container {
  position: relative;
}

.page-faq .breadcrumb {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}

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

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

.page-faq .faq-hero .eyebrow {
  margin-top: 1.2rem;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.95rem, 6.2vw, 4rem);
  line-height: 1.03;
  letter-spacing: -0.015em;
  max-width: 19ch;
}

.page-faq .flare {
  color: var(--cyan);
}

.page-faq .faq-hero .lede {
  margin: 1.1rem 0 0;
  max-width: 60ch;
  font-size: clamp(0.94rem, 2.1vw, 1.04rem);
  line-height: 1.85;
  color: var(--faq-text);
}

.page-faq .hero-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.6rem;
}

.page-faq .hero-jump a {
  display: inline-block;
  padding: 0.5rem 0.95rem;
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(7, 7, 12, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% 68%, calc(100% - 11px) 100%, 0 100%);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .hero-jump a:hover,
.page-faq .hero-jump a:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
  background: rgba(38, 247, 227, 0.08);
}

.page-faq .hero-jump a:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: 2px;
}

/* ---------- 分流诊断 ---------- */
.page-faq .faq-diagnose {
  padding-top: clamp(1.8rem, 4vw, 2.8rem);
}

.page-faq .diag-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.4vw, 1.85rem);
  letter-spacing: 0.01em;
}

.page-faq .diag-head p {
  margin: 0.55rem 0 0;
  max-width: 54ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--faq-text-dim);
}

.page-faq .diag-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.page-faq .diag-card {
  position: relative;
  display: block;
  padding: 1.1rem 1.05rem 1.2rem;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(26, 14, 46, 0.92), rgba(7, 7, 12, 0.62));
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-faq .diag-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0.2);
  transform-origin: top;
  transition: transform 0.28s var(--ease), background 0.2s var(--ease);
}

.page-faq .diag-card:nth-child(2)::after { background: var(--orange); }
.page-faq .diag-card:nth-child(3)::after { background: var(--pink); }
.page-faq .diag-card:nth-child(4)::after { background: var(--warn); }

.page-faq .diag-card:hover,
.page-faq .diag-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--line-cyan);
  box-shadow: var(--shadow-cyan);
}

.page-faq .diag-card:hover::after,
.page-faq .diag-card:focus-visible::after {
  transform: scaleY(1);
}

.page-faq .diag-card:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: 3px;
}

.page-faq .diag-num {
  display: block;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .diag-card:nth-child(2) .diag-num { color: var(--orange); }
.page-faq .diag-card:nth-child(3) .diag-num { color: var(--pink); }
.page-faq .diag-card:nth-child(4) .diag-num { color: var(--warn); }

.page-faq .diag-card h3 {
  margin: 0.55rem 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.04rem;
  letter-spacing: 0.01em;
}

.page-faq .diag-card p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--faq-text-dim);
}

.page-faq .diag-figure {
  margin: 1.6rem 0 0;
  border: 1px solid var(--line-cyan);
  background: var(--void);
  overflow: hidden;
}

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

.page-faq .diag-figure figcaption {
  padding: 0.7rem 0.9rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--faq-text-dim);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 主体布局 ---------- */
.page-faq .faq-main {
  padding-top: clamp(1.6rem, 4vw, 2.6rem);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}

.page-faq .rail-head {
  margin: 0 0 0.6rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--ash);
}

.page-faq .faq-rail nav {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.3rem;
  scrollbar-width: thin;
}

.page-faq .rail-link {
  flex: 0 0 auto;
  padding: 0.45rem 0.8rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--ash);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .rail-link:hover,
.page-faq .rail-link:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
}

.page-faq .rail-link:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: 2px;
}

/* ---------- 章节 ---------- */
.page-faq .faq-sec + .faq-sec {
  margin-top: clamp(2rem, 5vw, 3.2rem);
}

.page-faq .faq-sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-faq .faq-sec-num {
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-faq .faq-sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.2rem, 3vw, 1.55rem);
  letter-spacing: 0.01em;
}

.page-faq .faq-sec-lede {
  margin: 0.8rem 0 1rem;
  max-width: 58ch;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--faq-text-dim);
}

.page-faq .faq-sec-lede a,
.page-faq .qa-a a,
.page-faq .esc-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-sec-lede a:hover,
.page-faq .qa-a a:hover,
.page-faq .esc-note a:hover {
  color: var(--pink);
}

/* ---------- 问答手风琴 ---------- */
.page-faq .qa {
  border: 1px solid var(--line-soft);
  background: var(--qa-bg);
  margin-bottom: 0.55rem;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--line);
}

.page-faq .qa[open] {
  border-color: rgba(38, 247, 227, 0.4);
  background: var(--qa-bg-open);
}

.page-faq .qa > summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 0.7rem;
  padding: 0.95rem 0.95rem;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .qa > summary::marker {
  content: "";
}

.page-faq .qa > summary:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: -2px;
}

.page-faq .qa-idx {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding-top: 0.2rem;
}

.page-faq .qa-q {
  font-size: 0.94rem;
  font-weight: 500;
  line-height: 1.62;
}

.page-faq .qa-mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 0.4rem;
}

.page-faq .qa-mark::before,
.page-faq .qa-mark::after {
  content: "";
  position: absolute;
  background: var(--ash);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .qa-mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-faq .qa-mark::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-faq .qa[open] .qa-mark::before,
.page-faq .qa[open] .qa-mark::after {
  background: var(--cyan);
}

.page-faq .qa[open] .qa-mark::after {
  transform: rotate(90deg);
}

.page-faq .qa-a {
  padding: 0 0.95rem 1rem 2.35rem;
}

.page-faq .qa-a p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.85;
  color: var(--faq-text);
}

.page-faq .qa-a p + p {
  margin-top: 0.6rem;
}

.page-faq .faq-figure {
  margin: 0 0 1.1rem;
  border: 1px solid var(--line);
  background: var(--void);
  overflow: hidden;
}

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

/* ---------- 客服升级块 ---------- */
.page-faq .faq-sec--last {
  margin-top: clamp(2rem, 5vw, 3.2rem);
}

.page-faq .escalate {
  position: relative;
  background: var(--paper);
  color: var(--void);
  padding: clamp(1.3rem, 4vw, 2.3rem);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-faq .escalate::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 48%, var(--pink) 78%, var(--warn));
}

.page-faq .escalate h2 {
  margin: 0.4rem 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.28rem, 3.4vw, 1.85rem);
  color: var(--void);
}

.page-faq .escalate > p {
  max-width: 60ch;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(7, 7, 12, 0.78);
}

.page-faq .escalate-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin-top: 1.3rem;
}

.page-faq .esc-item {
  border-top: 1px solid rgba(7, 7, 12, 0.2);
  padding-top: 0.65rem;
}

.page-faq .esc-k {
  margin: 0;
  font-family: var(--font-data);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: rgba(7, 7, 12, 0.55);
}

.page-faq .esc-v {
  margin: 0.3rem 0 0;
  font-family: var(--font-data);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--void);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-faq .esc-note {
  margin: 1.2rem 0 0;
  font-size: 0.82rem;
  line-height: 1.8;
  color: rgba(7, 7, 12, 0.62);
}

.page-faq .esc-note a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .esc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.25rem;
}

.page-faq .esc-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.6rem 1.05rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--void);
  border: 1px solid var(--void);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .esc-btn--solid {
  background: var(--orange);
  border-color: var(--orange);
}

.page-faq .esc-btn:hover,
.page-faq .esc-btn:focus-visible {
  background: var(--void);
  color: var(--paper);
  border-color: var(--void);
}

.page-faq .esc-btn:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .diag-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .escalate-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-faq .diag-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.2rem);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.6rem);
  }

  .page-faq .faq-rail nav {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding-bottom: 0;
  }

  .page-faq .rail-link {
    border: 0;
    border-left: 1px solid var(--line);
    padding: 0.55rem 0 0.55rem 0.9rem;
    white-space: normal;
  }

  .page-faq .rail-link:hover,
  .page-faq .rail-link:focus-visible {
    border-left-color: var(--cyan);
    color: var(--paper);
  }

  .page-faq .qa > summary {
    padding: 1.05rem 1.2rem;
  }

  .page-faq .qa-a {
    padding: 0.1rem 1.3rem 1.15rem 2.95rem;
  }

  .page-faq .diag-figure figcaption {
    padding: 0.8rem 1.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .diag-card,
  .page-faq .qa,
  .page-faq .qa-mark::before,
  .page-faq .qa-mark::after {
    transition: none;
  }

  .page-faq .diag-card:hover,
  .page-faq .diag-card:focus-visible {
    transform: none;
  }
}