.page-faq {
  --faq-index-w: 292px;
  --faq-line: rgba(22, 48, 79, .85);
  display: block;
  background: linear-gradient(180deg, var(--abyss-900) 0%, var(--abyss-950) 100%);
  color: var(--ink-050);
  padding-bottom: clamp(56px, 8vw, 108px);
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--coral-500);
  outline-offset: 3px;
}

/* 面包屑 */
.page-faq .faq-crumbs {
  padding-top: 18px;
}

.page-faq .faq-crumbs .crumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--ink-300);
}

.page-faq .faq-crumbs .crumbs-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-faq .faq-crumbs .crumbs-item + .crumbs-item::before {
  content: "/";
  color: rgba(169, 184, 199, .45);
}

.page-faq .faq-crumbs a {
  color: var(--ink-300);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

.page-faq .faq-crumbs a:hover {
  color: var(--coral-400);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(44px, 7vw, 92px) 0 clamp(44px, 7vw, 84px);
  border-bottom: var(--hairline);
  background: linear-gradient(172deg, rgba(16, 32, 58, .8) 0%, rgba(10, 18, 32, 0) 68%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(142deg, rgba(22, 48, 79, .92) 0%, rgba(22, 48, 79, 0) 62%);
  clip-path: polygon(0 0, 62% 0, 38% 100%, 0 100%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -14vw;
  top: -22%;
  width: 54vw;
  height: 140%;
  pointer-events: none;
  background:
    radial-gradient(circle at 32% 22%, rgba(79, 209, 176, .12), transparent 62%),
    radial-gradient(circle at 68% 72%, rgba(255, 106, 61, .09), transparent 64%);
}

.page-faq .faq-hero-inner {
  position: relative;
  display: grid;
  gap: 40px;
}

.page-faq .faq-hero h1 {
  margin: .28em 0 .5em;
  font-size: clamp(2.1rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.01em;
  max-width: 15em;
}

.page-faq .faq-hero .lead {
  max-width: 34em;
  color: var(--ink-300);
  font-size: .98rem;
  line-height: 1.8;
}

.page-faq .faq-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-faq .faq-hero-panel {
  padding-left: 18px;
  border-left: 1px solid var(--abyss-700);
}

.page-faq .faq-console .console-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: var(--hairline);
  font-size: .82rem;
}

.page-faq .faq-console .console-row:last-child {
  border-bottom: 0;
}

.page-faq .faq-console .console-key {
  color: var(--ink-300);
  letter-spacing: .1em;
}

.page-faq .faq-console .console-val {
  font-family: var(--font-mono);
  letter-spacing: .12em;
  color: var(--coral-400);
}

@media (min-width: 1024px) {
  .page-faq .faq-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
  }
}

/* 三步顺序 */
.page-faq .faq-steps {
  margin-bottom: clamp(40px, 6vw, 72px);
}

.page-faq .faq-steps-head h2 {
  margin: .35em 0 0;
  font-size: clamp(1.3rem, 3.2vw, 1.95rem);
  font-weight: 800;
  line-height: 1.28;
  max-width: 22em;
}

.page-faq .faq-steps-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-faq .faq-step {
  position: relative;
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 22px 18px 18px;
  background: var(--abyss-800);
  border: var(--hairline);
}

.page-faq .faq-step::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 3px;
  background: var(--coral-500);
}

.page-faq .faq-step-num {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--ink-300);
}

.page-faq .faq-step-title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 800;
  line-height: 1.45;
}

.page-faq .faq-step p {
  margin: 0;
  color: var(--ink-300);
  font-size: .9rem;
  line-height: 1.76;
}

.page-faq .faq-step-link {
  justify-self: start;
  color: var(--coral-400);
  font-size: .82rem;
  letter-spacing: .06em;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 61, .4);
  padding-bottom: 2px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-faq .faq-step-link:hover {
  color: var(--coral-500);
  border-color: var(--coral-500);
}

@media (min-width: 840px) {
  .page-faq .faq-steps-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* 索引 + 主区布局 */
.page-faq .faq-layout {
  display: grid;
  gap: 36px;
}

.page-faq .faq-index {
  min-width: 0;
}

.page-faq .faq-index-figure {
  margin: 0 0 22px;
  border: var(--hairline);
  overflow: hidden;
}

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

.page-faq .faq-index-group {
  padding: 12px 0;
  border-top: var(--hairline);
}

.page-faq .faq-index-glabel {
  margin: 0 0 8px;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--ink-300);
}

.page-faq .faq-index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
}

.page-faq .faq-index-list a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 7px 6px 7px 10px;
  border-left: 2px solid transparent;
  color: var(--ink-300);
  font-size: .85rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .faq-index-list a .num {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: rgba(169, 184, 199, .7);
}

.page-faq .faq-index-list a:hover {
  color: var(--ink-050);
  border-left-color: var(--coral-500);
  background: rgba(16, 32, 58, .6);
}

.page-faq .faq-main {
  display: grid;
  gap: clamp(46px, 6vw, 76px);
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 92px;
  }
}

/* 章节头 */
.page-faq .faq-chapter {
  min-width: 0;
}

.page-faq .faq-chapter .chapter-head {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.page-faq .faq-chapter .chapter-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: .86;
  letter-spacing: -.02em;
  color: rgba(169, 184, 199, .3);
}

.page-faq .faq-chapter .chapter-title {
  margin: 0;
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  font-weight: 800;
  line-height: 1.3;
}

.page-faq .faq-chapter .chapter-note {
  margin: .45em 0 0;
  max-width: 34em;
  color: var(--ink-300);
  font-size: .86rem;
  line-height: 1.72;
}

/* 条目折叠列表 */
.page-faq .faq-items {
  display: grid;
  gap: 10px;
}

.page-faq .faq-item {
  border: var(--hairline);
  background: var(--abyss-800);
  scroll-margin-top: 96px;
  transition: border-color 240ms var(--ease), background 240ms var(--ease);
}

.page-faq .faq-item[open] {
  background: rgba(16, 32, 58, .72);
}

.page-faq .faq-summary {
  position: relative;
  display: block;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
  transition: background 200ms var(--ease);
}

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

.page-faq .faq-summary:hover {
  background: rgba(22, 48, 79, .45);
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 14px;
  gap: 12px;
  align-items: start;
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink-050);
}

.page-faq .faq-num {
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--coral-500);
  padding-top: .2em;
}

.page-faq .faq-qtext {
  min-width: 0;
  overflow-wrap: anywhere;
}

.page-faq .faq-mark {
  position: relative;
  align-self: center;
  width: 12px;
  height: 12px;
}

.page-faq .faq-mark::before,
.page-faq .faq-mark::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 12px;
  height: 1px;
  background: var(--ink-300);
  transition: transform 240ms var(--ease), opacity 240ms var(--ease);
}

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

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

.page-faq .faq-body {
  padding: 2px 20px 22px;
  animation: faq-open 280ms var(--ease) both;
}

.page-faq .faq-body p {
  margin: 0 0 .8em;
  max-width: 34em;
  color: var(--ink-300);
  font-size: .94rem;
  line-height: 1.8;
}

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

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 640px) {
  .page-faq .faq-body {
    padding: 2px 24px 24px 72px;
  }
}

/* 第 04 条突出 */
.page-faq .faq-item--featured {
  border-left: 3px solid var(--coral-500);
  background: linear-gradient(100deg, rgba(255, 106, 61, .08), rgba(16, 32, 58, 1) 26%);
}

.page-faq .faq-item--featured[open] {
  background: linear-gradient(100deg, rgba(255, 106, 61, .1), rgba(16, 32, 58, .8) 28%);
}

.page-faq .faq-figure {
  margin: 0 0 20px;
  border: var(--hairline);
  overflow: hidden;
}

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

.page-faq .faq-quotes {
  margin: 16px 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-faq .faq-quote {
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--abyss-700);
}

.page-faq .faq-quote p {
  margin: 0;
  max-width: 34em;
  color: var(--ink-050);
  font-size: .93rem;
  line-height: 1.76;
}

.page-faq .faq-quote-src {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--celadon-400);
}

.page-faq .faq-note {
  margin: 0;
  max-width: 36em;
  color: var(--ink-300);
  font-size: .82rem;
  line-height: 1.78;
}

/* 条目维护 */
.page-faq .faq-upkeep {
  padding-top: 28px;
  border-top: var(--hairline);
}

.page-faq .faq-upkeep h2 {
  margin: .35em 0 0;
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 800;
  line-height: 1.3;
}

.page-faq .faq-upkeep-grid {
  margin-top: 26px;
  display: grid;
  gap: 26px;
}

.page-faq .faq-upkeep-copy p {
  margin: 0 0 1em;
  max-width: 34em;
  color: var(--ink-300);
  font-size: .94rem;
  line-height: 1.82;
}

.page-faq .faq-upkeep-copy p:last-child {
  margin-bottom: 0;
}

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

.page-faq .faq-upkeep-links a {
  display: block;
  padding: 12px 14px;
  border: var(--hairline);
  color: var(--ink-050);
  font-size: .9rem;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color 200ms var(--ease), color 200ms var(--ease), background 200ms var(--ease);
}

.page-faq .faq-upkeep-links a:hover {
  border-color: var(--coral-500);
  color: var(--coral-400);
  background: rgba(16, 32, 58, .6);
}

@media (min-width: 900px) {
  .page-faq .faq-upkeep-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-body {
    animation: none;
  }

  .page-faq .faq-summary,
  .page-faq .faq-mark::before,
  .page-faq .faq-mark::after,
  .page-faq .faq-index-list a,
  .page-faq .faq-upkeep-links a,
  .page-faq .faq-crumbs a,
  .page-faq .faq-step-link,
  .page-faq .faq-item {
    transition: none;
  }
}