.page-faq {
  --faq-line: rgba(14, 22, 33, 0.14);
  --faq-line-soft: rgba(14, 22, 33, 0.08);
  --faq-ink-a72: rgba(14, 22, 33, 0.72);
  background: var(--paper);
  color: var(--rock);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(32px, 6vw, 64px);
}

.page-faq .faq-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-faq .faq-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(14, 22, 33, 0.4) 0%, rgba(14, 22, 33, 0.86) 58%, var(--ink) 100%),
    repeating-linear-gradient(90deg, rgba(46, 196, 182, 0.1) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(201, 220, 234, 0.07) 0 1px, transparent 1px 96px);
}

.page-faq .faq-hero-inner {
  position: relative;
  z-index: 2;
  padding-top: clamp(36px, 6vw, 84px);
}

.page-faq .faq-hero .eyebrow {
  color: var(--gold);
  margin: 0;
}

.page-faq .faq-hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 14px 0 0;
  max-width: 17em;
  color: var(--white);
}

.page-faq .faq-hero-lead {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 48em;
  font-size: clamp(15px, 1.35vw, 18px);
  line-height: 1.85;
  color: var(--paper-a70);
}

.page-faq .faq-hero-meta {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--paper-a16);
  border: 1px solid var(--paper-a16);
}

.page-faq .faq-meta-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-faq .faq-meta-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1;
  color: var(--gold);
}

.page-faq .faq-meta-label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--paper-a70);
}

/* ---------- 主体双栏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(30px, 5vw, 60px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .kb-aside {
  min-width: 0;
}

.page-faq .kb-aside-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-faq .kb-index {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .kb-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 0;
  border-top: 1px solid var(--faq-line);
  color: var(--rock);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-faq .kb-index li:last-child a {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .kb-index a:hover,
.page-faq .kb-index a:focus-visible {
  color: var(--ice);
}

.page-faq .kb-index-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--maple);
}

.page-faq .kb-index-name {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .kb-index .status-dot {
  flex: none;
  align-self: center;
}

.page-faq .kb-hint {
  margin: 22px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--faq-ink-a72);
}

.page-faq .kb-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-faq .kb-section {
  padding-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--faq-line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-faq .kb-section + .kb-section {
  margin-top: clamp(40px, 6vw, 72px);
}

.page-faq .kb-eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ice);
}

.page-faq .kb-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.1vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .kb-lead {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--faq-ink-a72);
}

/* ---------- 问答折叠 ---------- */
.page-faq .qa-list {
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-faq .qa {
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .qa:last-child {
  border-bottom: 1px solid var(--faq-line-soft);
}

.page-faq .qa-q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 0;
  list-style: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--rock);
  transition: color 0.18s var(--ease);
}

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

.page-faq .qa-q:hover,
.page-faq .qa-q:focus-visible {
  color: var(--ice);
}

.page-faq .qa-mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  border: 1px solid var(--ice);
}

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

.page-faq .qa-mark::before {
  top: 50%;
  left: 3px;
  right: 3px;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .qa-mark::after {
  left: 50%;
  top: 3px;
  bottom: 3px;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .qa[open] .qa-mark::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .qa-a {
  padding: 0 0 18px 28px;
}

.page-faq .qa-a p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--faq-ink-a72);
}

.page-faq .qa-a p + p {
  margin-top: 10px;
}

.page-faq .qa-a a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 步骤卡 ---------- */
.page-faq .steps {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--faq-line);
  border: 1px solid var(--faq-line);
}

.page-faq .step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  background: var(--white);
}

.page-faq .step-num {
  flex: none;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ice);
}

.page-faq .step-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faq-ink-a72);
}

/* ---------- 图片 ---------- */
.page-faq .kb-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: 1px solid var(--faq-line);
  background: var(--white);
}

.page-faq .kb-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .kb-figure-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--faq-line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--moss);
}

/* ---------- 深色支持区 ---------- */
.page-faq .kb-section--ink {
  margin-top: clamp(40px, 6vw, 72px);
  padding: clamp(24px, 4vw, 44px);
  background: var(--ink);
  color: var(--paper);
  border-top: 0;
}

.page-faq .kb-section--ink .kb-eyebrow {
  color: var(--aurora);
}

.page-faq .kb-section--ink .kb-title {
  color: var(--paper);
}

.page-faq .kb-section--ink .kb-lead,
.page-faq .kb-section--ink .kb-note {
  color: var(--paper-a70);
}

.page-faq .kb-tips {
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .kb-tips li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-a70);
}

.page-faq .kb-tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--gold);
}

.page-faq .kb-contact {
  margin-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--paper-a16);
}

.page-faq .kb-contact-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  padding: 12px 0;
  border-bottom: 1px solid var(--paper-a16);
}

.page-faq .kb-contact-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-faq .kb-contact-val {
  font-size: 15px;
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

.page-faq .kb-note {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.8;
}

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

.page-faq .kb-links {
  margin-top: clamp(18px, 2.6vw, 26px);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .kb-links .btn {
  text-decoration: none;
}

.page-faq .kb-section--ink .btn--outline {
  color: var(--paper);
  border-color: var(--paper-a45);
}

.page-faq .kb-section--ink .btn--outline:hover,
.page-faq .kb-section--ink .btn--outline:focus-visible {
  color: var(--ink);
  background: var(--paper);
  border-color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .kb-contact-row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

@media (min-width: 720px) {
  .page-faq .faq-hero-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(220px, 292px) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .kb-aside {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa-mark::before,
  .page-faq .qa-mark::after,
  .page-faq .qa-q,
  .page-faq .kb-index a {
    transition: none;
  }
}