.page-faq {
  --faq-mono: var(--font-mono);
  --faq-sans: var(--font-sans);
  background: var(--cream);
  color: var(--ink);
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  .page-faq {
    scroll-behavior: auto;
  }
}

/* ── 帮助中心首屏 ── */
.faq-hero {
  position: relative;
  padding: 32px 0 48px;
  overflow: hidden;
  border-bottom: 6px solid var(--moss);
}

.faq-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  background: linear-gradient(135deg, rgba(60, 122, 94, 0.9), rgba(110, 191, 139, 0.55));
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.22;
  pointer-events: none;
}

.faq-hero-inner {
  display: grid;
  gap: 24px;
  position: relative;
}

.faq-hero-copy {
  max-width: 46rem;
}

.faq-hero-copy .breadcrumb {
  margin-bottom: 4px;
}

.faq-hero-kicker {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 18px 0 10px;
  font-family: var(--faq-mono);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  color: var(--rock);
  text-transform: uppercase;
}

.faq-hero-kicker::before {
  content: "";
  display: inline-block;
  width: 32px;
  height: 3px;
  background: var(--terra);
}

.faq-hero h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.faq-hero-desc {
  margin: 0;
  color: var(--rock);
  font-size: 1rem;
  line-height: 1.85;
  max-width: 40rem;
}

.faq-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px 20px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 2px solid rgba(60, 122, 94, 0.25);
}

.faq-stat-num {
  display: block;
  font-family: var(--faq-mono);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--moss);
}

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

.faq-stat:nth-child(4) .faq-stat-num {
  color: var(--data-blue);
}

.faq-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.faq-hero-figure {
  position: relative;
  margin: 0;
}

.faq-hero-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.faq-hero-chip {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 8px 12px;
  background: rgba(248, 248, 248, 0.82);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.faq-hero-cap {
  margin-top: 12px;
  padding-left: 10px;
  border-left: 3px solid var(--terra);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--rock);
}

/* ── 页面主骨架 ── */
.faq-shell {
  display: grid;
  gap: 28px;
  padding: 40px 0 24px;
}

.faq-side-inner {
  padding: 18px 16px 20px;
  border-left: 4px solid var(--terra);
  border-top: 1px solid rgba(90, 107, 112, 0.12);
  border-right: 1px solid rgba(90, 107, 112, 0.12);
  border-bottom: 1px solid rgba(90, 107, 112, 0.12);
  background: rgba(248, 248, 248, 0.6);
}

.faq-side-label {
  margin: 0 0 12px;
  font-family: var(--faq-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--rock);
  text-transform: uppercase;
}

.faq-side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.faq-side-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 8px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  border-radius: var(--radius);
  transition: background-color 0.3s, color 0.3s, margin-left 0.3s;
}

.faq-side-list a:hover,
.faq-side-list a:focus-visible {
  background: rgba(60, 122, 94, 0.08);
  color: var(--moss);
}

.faq-side-num {
  font-family: var(--faq-mono);
  font-size: 0.75rem;
  color: var(--terra);
}

/* ── 问题分类章节 ── */
.faq-section {
  margin-top: 44px;
  scroll-margin-top: calc(var(--header-height) + 12px);
}

.faq-section:first-child {
  margin-top: 0;
}

.faq-section-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--moss);
  margin-bottom: 18px;
}

.faq-section-num {
  font-family: var(--faq-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--terra);
}

.faq-section-head h2 {
  margin: 0;
  font-size: 1.6rem;
  line-height: 1.2;
}

.faq-section-note {
  margin-left: auto;
  font-size: 0.82rem;
  color: var(--rock);
}

.faq-items {
  display: grid;
  gap: 12px;
}

.faq-item {
  background: rgba(248, 248, 248, 0.66);
  border: 1px solid rgba(90, 107, 112, 0.14);
  border-radius: var(--radius);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.faq-item[open] {
  border-color: rgba(60, 122, 94, 0.55);
  box-shadow: var(--shadow-sm);
}

.faq-q {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.96rem;
  line-height: 1.5;
  border-radius: var(--radius);
  transition: background-color 0.3s;
}

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

.faq-q:hover {
  background: rgba(60, 122, 94, 0.06);
}

.faq-q:focus-visible {
  outline: 2px solid var(--terra);
  outline-offset: -2px;
}

.faq-q-text {
  flex: 1 1 auto;
}

.faq-q-icon {
  position: relative;
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  color: var(--moss);
}

.faq-q-icon::before,
.faq-q-icon::after {
  content: "";
  position: absolute;
  display: block;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.faq-q-icon::before {
  top: 11px;
  left: 4px;
  right: 4px;
  height: 2px;
}

.faq-q-icon::after {
  top: 4px;
  bottom: 4px;
  left: 11px;
  width: 2px;
}

.faq-item[open] .faq-q-icon::after {
  transform: rotate(90deg);
  opacity: 0;
}

.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer-inner {
  overflow: hidden;
}

.faq-answer-inner > p {
  margin: 0;
  padding: 0 16px 18px 56px;
  color: var(--rock);
  line-height: 1.85;
  font-size: 0.94rem;
}

.faq-answer-inner a {
  color: var(--data-blue);
  font-weight: 700;
  text-decoration: underline dotted;
  text-underline-offset: 3px;
  transition: color 0.3s;
}

.faq-answer-inner a:hover {
  color: var(--terra);
}

/* ── 分类徽标 ── */
.faq-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  border-radius: var(--radius);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--cream);
}

.faq-badge-hot {
  background: var(--terra);
}

.faq-badge-upgrade {
  background: var(--moss);
}

.faq-badge-data {
  background: var(--spring);
  color: var(--ink);
}

.faq-badge-device {
  background: var(--data-blue);
}

/* ── 联系技术支持 ── */
.faq-support-section {
  margin-top: 64px;
  padding: 56px 0 64px;
  background: var(--moss);
  border-top: 6px solid var(--spring);
  scroll-margin-top: calc(var(--header-height) + 12px);
}

.faq-support-head {
  border-bottom-color: rgba(244, 239, 230, 0.3);
}

.faq-support-head .faq-section-num {
  color: var(--cream);
}

.faq-support-head h2 {
  color: var(--cream);
}

.faq-support-head .faq-section-note {
  color: rgba(244, 239, 230, 0.75);
}

.faq-support-card {
  position: relative;
  display: grid;
  gap: 24px;
  padding: 24px;
  background-color: rgba(248, 248, 248, 0.78);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: calc(var(--radius) + 2px);
  box-shadow: var(--shadow-md);
}

.faq-support-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--terra) 0 25%, var(--warn) 25% 50%, var(--spring) 50% 75%, var(--data-blue) 75% 100%);
}

.faq-support-copy {
  min-width: 0;
}

.faq-support-lead {
  margin: 0 0 6px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--rock);
}

.faq-support-mail {
  margin: 0 0 14px;
}

.faq-support-mail span {
  font-family: var(--faq-mono);
  font-size: clamp(1.25rem, 3vw, 1.65rem);
  font-weight: 700;
  color: var(--data-blue);
  word-break: break-all;
}

.faq-support-note {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--rock);
  max-width: 58ch;
}

.faq-support-meta {
  list-style: none;
  margin: 20px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid rgba(90, 107, 112, 0.18);
  display: grid;
  gap: 6px;
}

.faq-support-meta li {
  font-size: 0.88rem;
  color: var(--rock);
}

.faq-support-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 20px;
}

.faq-support-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--moss);
  font-weight: 700;
  text-decoration: none;
}

.faq-support-link::after {
  content: "→";
  color: var(--terra);
  font-family: var(--faq-mono);
  transition: transform 0.3s;
}

.faq-support-link:hover::after {
  transform: translate(3px, 0);
}

.faq-support-figure {
  margin: 0;
}

.faq-support-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

/* ── 桌面端 ── */
@media (min-width: 960px) {
  .faq-hero {
    padding: 48px 0 64px;
  }

  .faq-hero-inner {
    grid-template-columns: 5fr 6fr;
    gap: 48px;
    align-items: center;
  }

  .faq-hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .faq-hero-figure {
    transform: translateY(10px) rotate(1.1deg);
  }

  .faq-shell {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 48px;
    padding: 48px 0 32px;
  }

  .faq-side {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    align-self: start;
  }

  .faq-section {
    margin-top: 52px;
  }

  .faq-section-head h2 {
    font-size: 1.9rem;
  }

  .faq-support-section {
    margin-top: 72px;
    padding: 64px 0 76px;
  }

  .faq-support-card {
    grid-template-columns: 1.2fr 0.9fr;
    gap: 40px;
    padding: 36px;
    align-items: center;
  }
}