.page-faq {
  --faq-sticky-top: 20px;
  background: var(--ink-950);
  color: var(--paper-100);
  font-family: var(--font-body);
  overflow-wrap: break-word;
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -3px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(26px, 4vw, 46px);
  background:
    radial-gradient(90% 80% at 88% -10%, rgba(47, 243, 208, 0.14), transparent 62%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 74, 63, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 74, 63, 0.5) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
}

.page-faq .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-faq .breadcrumbs-link {
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) ease;
}

.page-faq .breadcrumbs-link:hover {
  border-bottom-color: var(--cyan-400);
}

.page-faq .breadcrumbs-sep {
  color: rgba(245, 239, 226, 0.34);
}

.page-faq .faq-crumb-now {
  color: var(--muted-dark);
}

.page-faq .faq-eyebrow {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan-400);
}

.page-faq .faq-h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  max-width: 16em;
  color: var(--paper-100);
}

.page-faq .faq-lede {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--muted-dark);
}

.page-faq .faq-hero-figure {
  position: relative;
  margin: clamp(20px, 3vw, 32px) 0 0;
  border: 1px solid rgba(47, 243, 208, 0.24);
  background: var(--ink-900);
  overflow: hidden;
}

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

.page-faq .faq-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 52%, rgba(6, 19, 15, 0.78));
}

.page-faq .faq-figure-cap {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan-200);
}

/* ---------- 四步流程 ---------- */
.page-faq .faq-steps {
  background: var(--paper-100);
  color: var(--ink-900);
  padding: clamp(28px, 5vw, 56px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--paper-200);
}

.page-faq .faq-eyebrow-dark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber-600);
}

.page-faq .faq-steps-head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-faq .faq-steps-sub {
  margin: 10px 0 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-faq .step-rail {
  display: none;
  color: var(--amber-400);
  margin: 26px 0 6px;
}

.page-faq .step-rail svg {
  display: block;
  width: 100%;
  height: 28px;
}

.page-faq .rail-stroke {
  stroke: var(--line);
  stroke-width: 2;
  stroke-dasharray: 7 9;
}

.page-faq .rail-dot {
  fill: var(--paper-100);
  stroke: var(--amber-400);
  stroke-width: 3;
}

.page-faq .step-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .step {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--paper-200);
  padding: 18px 16px 18px;
  transition: transform var(--dur) ease, border-color var(--dur) ease, box-shadow var(--dur) ease;
}

.page-faq .step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--ink-900);
}

.page-faq .step:hover,
.page-faq .step:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan-400);
  box-shadow: 0 10px 24px rgba(6, 19, 15, 0.1);
}

.page-faq .step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber-600);
  background: var(--paper-100);
  border: 1px solid var(--paper-200);
  padding: 1px 7px;
  font-variant-numeric: tabular-nums;
}

.page-faq .step-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-faq .step-text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-muted);
}

.page-faq .step-text a {
  color: var(--green-700);
  text-decoration: underline;
  text-decoration-color: var(--amber-400);
  text-underline-offset: 3px;
}

/* ---------- 问答主体 ---------- */
.page-faq .faq-board {
  background:
    radial-gradient(70% 46% at 0% 0%, rgba(18, 53, 41, 0.8), transparent 72%),
    var(--ink-950);
  padding: clamp(32px, 5vw, 64px) 0;
}

.page-faq .faq-board-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .faq-board-head h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper-100);
}

.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.page-faq .faq-rail {
  align-self: start;
  background: var(--ink-900);
  border: 1px solid var(--line);
  padding: 14px 14px 16px;
}

.page-faq .faq-rail-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan-200);
}

.page-faq .faq-rail-nav {
  display: grid;
  gap: 4px;
}

.page-faq .faq-rail-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 8px;
  font-size: 14.5px;
  color: var(--paper-100);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background var(--dur) ease, border-color var(--dur) ease, color var(--dur) ease;
}

.page-faq .faq-rail-link:hover,
.page-faq .faq-rail-link:focus-visible {
  background: var(--green-700);
  border-left-color: var(--cyan-400);
  color: #ffffff;
}

.page-faq .faq-rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
}

.page-faq .faq-group {
  margin: 0 0 clamp(26px, 4vw, 42px);
  scroll-margin-top: 80px;
}

.page-faq .faq-group:last-child {
  margin-bottom: 0;
}

.page-faq .faq-group-head {
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--cyan-400);
}

.page-faq .faq-group-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--amber-400);
}

.page-faq .faq-group-head h2 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.2;
  color: var(--paper-100);
}

/* 手风琴 */
.page-faq .faq-item {
  position: relative;
  margin: 0 0 10px;
  background: var(--ink-900);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: box-shadow var(--dur) ease, background var(--dur) ease;
}

.page-faq .faq-item:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item[open] {
  background: var(--green-700);
  box-shadow: inset 0 0 0 1px rgba(47, 243, 208, 0.5);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper-100);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan-400);
  transition: color var(--dur) ease;
}

.page-faq .faq-item[open] summary::after {
  content: "−";
  color: var(--amber-400);
}

.page-faq .faq-item-num {
  flex: none;
  margin-top: 2px;
  padding: 2px 6px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-item-q {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item-body {
  margin: 0 16px;
  padding: 12px 0 16px;
  border-top: 1px dashed rgba(245, 239, 226, 0.18);
}

.page-faq .faq-item-body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted-dark);
}

.page-faq .faq-item-body p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item-body a {
  color: var(--cyan-200);
  text-decoration: underline;
  text-decoration-color: rgba(47, 243, 208, 0.5);
  text-underline-offset: 3px;
}

.page-faq .faq-item-body a:hover {
  color: #ffffff;
}

.page-faq .faq-item-body ol {
  counter-reset: faq-o;
  list-style: none;
  margin: 6px 0 10px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-item-body ol li {
  counter-increment: faq-o;
  position: relative;
  padding-left: 30px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted-dark);
}

.page-faq .faq-item-body ol li::before {
  content: counter(faq-o, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan-400);
}

.page-faq .faq-item-body .tag {
  display: inline-block;
  margin-top: 2px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber-400);
  border: 1px solid rgba(242, 181, 68, 0.45);
  background: rgba(242, 181, 68, 0.08);
}

/* 版本区配图 */
.page-faq .faq-media {
  margin: 18px 0 0;
  background: var(--ink-900);
  border: 1px solid var(--line);
}

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

.page-faq .faq-media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan-200);
}

/* 材料清单 */
.page-faq .faq-materials {
  background: var(--paper-100);
  color: var(--ink-900);
  border-left: 4px solid var(--amber-400);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-faq .faq-materials h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.2;
}

.page-faq .faq-materials-lead {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-muted);
}

.page-faq .faq-materials-lead:last-child {
  margin: 14px 0 0;
  color: var(--ink-900);
  font-weight: 600;
}

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

.page-faq .material-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px dashed var(--paper-200);
}

.page-faq .material-item:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-faq .material-box {
  flex: none;
  width: 15px;
  height: 15px;
  margin-top: 4px;
  border: 1.5px solid var(--ink-900);
  background: #ffffff;
}

.page-faq .material-item span:last-child {
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--ink-900);
}

.page-faq .material-item b {
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--amber-600);
  font-variant-numeric: tabular-nums;
}

/* 术语卡 */
.page-faq .term-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-faq .term {
  background: var(--ink-900);
  box-shadow: inset 0 0 0 1px var(--line);
  padding: 14px 16px;
}

.page-faq .term-name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber-400);
}

.page-faq .term-desc {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted-dark);
}

/* ---------- 联系收口 ---------- */
.page-faq .faq-cta-section {
  background: var(--ink-950);
  padding: 0 0 clamp(36px, 5vw, 64px);
}

.page-faq .faq-cta {
  padding: clamp(20px, 3vw, 34px);
  background:
    linear-gradient(135deg, rgba(242, 181, 68, 0.13), transparent 58%),
    var(--ink-900);
  border: 1px solid rgba(242, 181, 68, 0.4);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-faq .faq-cta-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--amber-400);
}

.page-faq .faq-cta h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.15;
  color: var(--paper-100);
}

.page-faq .faq-cta-text {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted-dark);
}

.page-faq .faq-cta-text b {
  color: var(--cyan-200);
  font-weight: 700;
}

.page-faq .faq-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-faq .faq-layout {
    grid-template-columns: 244px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: var(--faq-sticky-top);
  }

  .page-faq .faq-item summary {
    padding: 16px 18px;
    font-size: 16.5px;
  }

  .page-faq .faq-item-body {
    margin: 0 18px;
    padding: 14px 0 18px;
  }
}

@media (min-width: 1040px) {
  .page-faq .step-rail {
    display: block;
  }

  .page-faq .step-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 8px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 262px minmax(0, 1fr);
  }

  .page-faq .faq-hero-figure {
    max-width: 1080px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step,
  .page-faq .faq-item,
  .page-faq .faq-rail-link,
  .page-faq .faq-item summary::after {
    transition: none;
  }

  .page-faq .step:hover,
  .page-faq .step:focus-within {
    transform: none;
  }
}