.page-faq {
  --faq-gap: clamp(48px, 6vw, 88px);
  --faq-cyan-soft: rgba(0, 229, 208, .08);
  background: var(--abyss-900);
  color: var(--text-100);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-faq .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-faq .breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-300);
}

.page-faq .breadcrumb-list li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--steel-500);
}

.page-faq .breadcrumb-list a {
  color: var(--text-300);
  text-decoration: none;
}

.page-faq .breadcrumb-list a:hover {
  color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(24px, 4vw, 44px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 1px solid var(--line-600);
}

.page-faq .faq-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(30px, 5vw, 56px);
  line-height: 1.06;
  letter-spacing: -.02em;
}

.page-faq .faq-lede {
  max-width: 60ch;
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-300);
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-toc {
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  background: var(--panel-700);
  padding: 18px 20px;
  box-shadow: var(--shadow-card);
}

.page-faq .faq-toc-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--steel-500);
}

.page-faq .faq-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-toc-list a {
  display: block;
  padding: 8px 0 8px 14px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-300);
  text-decoration: none;
  transition: color 180ms var(--ease-out), border-color 180ms var(--ease-out);
}

.page-faq .faq-toc-list a:hover,
.page-faq .faq-toc-list a[aria-current="true"] {
  color: var(--cyan-400);
  border-left-color: var(--cyan-400);
}

@media (min-width: 900px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.7fr) minmax(250px, .85fr);
    align-items: start;
  }
}

/* ---------- 章节骨架 ---------- */

.page-faq .faq-section {
  padding-top: var(--faq-gap);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-faq .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 14px;
  align-items: baseline;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-faq .section-index {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan-400);
  padding-top: 4px;
}

.page-faq .section-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-faq .section-sub {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-300);
}

/* ---------- 分类卡 ---------- */

.page-faq .triage-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .triage-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 16px;
  background: var(--abyss-800);
  transition: background 180ms var(--ease-out);
}

.page-faq .triage-card:hover {
  background: var(--panel-700);
}

.page-faq .triage-num {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan-400);
}

.page-faq .triage-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
}

.page-faq .triage-desc {
  margin: 0;
  flex: 1;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-300);
}

.page-faq .triage-link {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--orange-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color 180ms var(--ease-out);
}

.page-faq .triage-link:hover {
  border-bottom-color: var(--orange-500);
}

@media (min-width: 700px) {
  .page-faq .triage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-faq .triage-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 步骤横带 ---------- */

.page-faq .steps {
  border-top: 1px solid var(--line-600);
}

.page-faq .step {
  border-bottom: 1px solid var(--line-600);
  scroll-margin-top: calc(var(--bar-h) + 16px);
}

.page-faq .step-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px 14px;
  align-items: center;
  padding: 16px 4px 16px 0;
  cursor: pointer;
  list-style: none;
  transition: background 180ms var(--ease-out);
}

.page-faq .step-head::-webkit-details-marker {
  display: none;
}

.page-faq .step-head:hover .step-name {
  color: var(--cyan-200);
}

.page-faq .step-num {
  font-family: var(--font-mono);
  font-size: clamp(18px, 4vw, 22px);
  letter-spacing: .04em;
  line-height: 1;
  color: var(--cyan-400);
}

.page-faq .step-name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  transition: color 180ms var(--ease-out);
}

.page-faq .step-toggle {
  position: relative;
  width: 16px;
  height: 16px;
  flex: none;
  justify-self: end;
}

.page-faq .step-toggle::before,
.page-faq .step-toggle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 16px;
  height: 1px;
  background: var(--orange-500);
  transition: transform 240ms var(--ease-out);
}

.page-faq .step-toggle::after {
  transform: rotate(90deg);
}

.page-faq .step[open] .step-toggle::after {
  transform: rotate(0deg);
}

.page-faq .step-body {
  display: grid;
  gap: 18px;
  padding: 0 0 22px;
}

.page-faq .step-do,
.page-faq .step-check {
  margin: 0 0 12px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
}

.page-faq .step-do {
  color: var(--text-100);
}

.page-faq .step-check {
  margin-bottom: 0;
  color: var(--text-300);
}

.page-faq .step-tag {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel-500);
}

.page-faq .step-figure {
  margin: 0;
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-700);
}

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

.page-faq .step-figure figcaption {
  padding: 10px 12px;
  border-top: 1px solid var(--line-600);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-300);
}

@media (min-width: 860px) {
  .page-faq .step-head {
    grid-template-columns: 110px minmax(0, 1fr) 32px;
    padding: 22px 4px 22px 0;
  }

  .page-faq .step-num {
    font-size: 32px;
  }

  .page-faq .step-name {
    font-size: 18px;
  }

  .page-faq .step-body {
    padding: 0 0 26px 110px;
  }

  .page-faq .step--with-figure .step-body {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .85fr);
    gap: 28px;
    align-items: start;
  }
}

/* ---------- 兼容对照 ---------- */

.page-faq .compat-figure {
  margin: 0 0 20px;
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--grad-signal);
  box-shadow: var(--shadow-card);
}

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

.page-faq .compat-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-600);
  background: var(--abyss-800);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--text-300);
}

.page-faq .compat-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  background: var(--abyss-800);
  -webkit-overflow-scrolling: touch;
}

.page-faq .compat-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
  font-size: 13px;
}

.page-faq .compat-table th,
.page-faq .compat-table td {
  padding: 11px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line-600);
  white-space: nowrap;
}

.page-faq .compat-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--panel-700);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-300);
}

.page-faq .compat-table tbody th {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--cyan-200);
}

.page-faq .compat-table tbody tr:last-child th,
.page-faq .compat-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .compat-table tbody tr:hover {
  background: var(--faq-cyan-soft);
}

.page-faq .st {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}

.page-faq .st::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.page-faq .st--ok {
  color: var(--cyan-400);
}

.page-faq .st--part {
  color: var(--amber-300);
}

.page-faq .st--limit {
  color: var(--orange-500);
}

.page-faq .compat-note {
  margin: 16px 0 0;
  max-width: 72ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-300);
}

.page-faq .compat-note a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid var(--line-600);
}

.page-faq .compat-note a:hover {
  border-bottom-color: var(--cyan-400);
}

/* ---------- 编号拆解 ---------- */

.page-faq .code-reader {
  display: grid;
  gap: 22px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  background: var(--grad-signal);
  box-shadow: var(--shadow-card);
}

.page-faq .code-sample {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 44px);
  letter-spacing: .04em;
  line-height: 1;
  color: var(--orange-500);
}

.page-faq .code-parts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .code-parts li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-600);
}

.page-faq .code-parts li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .code-parts .mono {
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--cyan-200);
}

.page-faq .code-parts p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-300);
}

.page-faq .code-tip {
  margin: 16px 0 0;
  max-width: 72ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-300);
}

@media (min-width: 760px) {
  .page-faq .code-reader {
    grid-template-columns: auto minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
    align-items: center;
  }
}

/* ---------- 提交清单 ---------- */

.page-faq .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .checklist li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 18px;
  background: var(--abyss-800);
}

.page-faq .check-idx {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan-400);
  padding-top: 3px;
}

.page-faq .checklist h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}

.page-faq .checklist p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-300);
}

@media (min-width: 760px) {
  .page-faq .checklist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 联系通道 ---------- */

.page-faq .contact-grid {
  display: grid;
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .contact-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: var(--panel-700);
}

.page-faq .contact-cell h3 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel-500);
}

.page-faq .contact-value {
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--cyan-400);
  text-decoration: none;
  word-break: break-all;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color 180ms var(--ease-out);
}

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

.page-faq .contact-cell p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-300);
}

.page-faq .contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-top: 2px;
}

.page-faq .contact-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--orange-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .contact-links a:hover {
  border-bottom-color: var(--orange-500);
}

.page-faq .contact-note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-300);
}

.page-faq .contact-note a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid var(--line-600);
}

.page-faq .contact-note a:hover {
  border-bottom-color: var(--cyan-400);
}

@media (min-width: 760px) {
  .page-faq .contact-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .step-toggle::before,
  .page-faq .step-toggle::after,
  .page-faq .triage-card,
  .page-faq .step-head,
  .page-faq .step-name,
  .page-faq .faq-toc-list a,
  .page-faq .triage-link,
  .page-faq .contact-value {
    transition: none;
  }
}