.page-faq {
  --faq-card: rgba(18, 40, 61, .55);
  --faq-card-strong: rgba(18, 40, 61, .94);
  position: relative;
  background: var(--navy-900);
  color: var(--ink);
  overflow-x: clip;
}

.page-faq::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--green-900) 0%, var(--green-600) 52%, var(--yellow) 82%, var(--red) 100%);
}

/* ---------- 首屏框景 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) var(--gutter) clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  isolation: isolate;
}

.page-faq .faq-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
  filter: grayscale(.45) contrast(1.08) brightness(.62);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(31, 138, 91, .34) 0%, rgba(10, 23, 38, 0) 62%),
    linear-gradient(118deg, rgba(10, 23, 38, .97) 26%, rgba(10, 23, 38, .74) 62%, rgba(14, 59, 42, .66) 100%);
}

.page-faq .faq-hero__frame {
  position: relative;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(22px, 4vw, 52px);
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(14, 59, 42, .28) 0%, rgba(10, 23, 38, .82) 100%);
}

.page-faq .faq-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(185, 198, 210, .16) 0 1px, transparent 1px 64px);
  opacity: .55;
  pointer-events: none;
}

.page-faq .faq-hero__frame > * {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero__frame .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--green-300);
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
  max-width: 22ch;
}

.page-faq .faq-hero__lead {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 68ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--ink);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1 1 140px;
  padding: 14px 18px 4px 0;
  border-left: 1px solid var(--line);
  padding-left: 18px;
}

.page-faq .faq-hero__fact:first-child {
  border-left: 0;
  padding-left: 0;
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  font-weight: 700;
  color: var(--green-300);
  line-height: 1;
}

.page-faq .faq-hero__cap {
  font-size: 13px;
  color: var(--silver);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(34px, 6vw, 72px) var(--gutter) clamp(48px, 8vw, 104px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-faq .faq-side__inner {
  display: grid;
  gap: 20px;
}

.page-faq .faq-index {
  border: 1px solid var(--line);
  background: var(--faq-card);
  padding: 0;
}

.page-faq .faq-index__title {
  margin: 0;
  padding: 12px 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--slate);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.5;
  color: var(--silver);
  text-decoration: none;
  transition: color var(--t) var(--ease), background var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-faq .faq-index__link:first-of-type {
  border-top: 0;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--green-300);
  background: rgba(99, 224, 165, .07);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--green-300);
  flex: none;
}

.page-faq .faq-side__cta {
  display: grid;
  gap: 10px;
  padding: 16px 14px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 59, 42, .4) 0%, rgba(18, 40, 61, .6) 100%);
}

.page-faq .faq-side__cta-title {
  margin: 0 0 2px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--silver);
}

.page-faq .faq-side__cta .btn {
  justify-content: center;
}

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

.page-faq .faq-block {
  margin-bottom: clamp(44px, 6vw, 78px);
  scroll-margin-top: 110px;
}

.page-faq .faq-block:last-of-type {
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-faq .faq-block__head {
  padding-top: 16px;
  border-top: 2px solid var(--green-600);
  margin-bottom: 22px;
}

.page-faq .faq-block__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--green-300);
  margin-bottom: 8px;
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.25;
}

.page-faq .faq-block__lead {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 手风琴 ---------- */
.page-faq .faq-list {
  border-top: 1px solid var(--line);
}

.page-faq .qa {
  border: 1px solid var(--line);
  border-top: 0;
  border-left: 3px solid transparent;
  background: var(--faq-card);
  transition: background var(--t) var(--ease), border-left-color var(--t) var(--ease);
}

.page-faq .qa[open] {
  border-left-color: var(--green-300);
  background: var(--faq-card-strong);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.65;
  color: var(--ink);
  transition: color var(--t) var(--ease);
}

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

.page-faq .qa__q:hover {
  color: var(--green-300);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--green-300);
  outline-offset: -3px;
}

.page-faq .qa__idx {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--slate);
  transition: color var(--t) var(--ease);
}

.page-faq .qa[open] .qa__idx {
  color: var(--green-300);
}

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

.page-faq .qa__mark {
  position: relative;
  flex: none;
  width: 12px;
  height: 12px;
  align-self: center;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  background: var(--silver);
  transition: transform var(--t) var(--ease), background var(--t) var(--ease);
}

.page-faq .qa__mark::before {
  top: 5px;
  left: 0;
  width: 12px;
  height: 1px;
}

.page-faq .qa__mark::after {
  top: 0;
  left: 5px;
  width: 1px;
  height: 12px;
}

.page-faq .qa[open] .qa__mark::before,
.page-faq .qa[open] .qa__mark::after {
  background: var(--green-300);
}

.page-faq .qa[open] .qa__mark::after {
  transform: scaleY(0);
}

.page-faq .qa__a {
  padding: 0 18px 20px 46px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--ink);
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin: 0 0 0 0;
}

.page-faq .qa__a p {
  margin: 0;
}

.page-faq .qa__a p + p {
  margin-top: 1em;
}

.page-faq .qa__a a {
  color: var(--green-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图解横幅与层级图 ---------- */
.page-faq .faq-banner {
  margin: 0 0 24px;
  border: 1px solid var(--line-strong);
  background: var(--navy-800);
}

.page-faq .faq-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.7) contrast(1.05);
}

.page-faq .faq-banner figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--slate);
}

.page-faq .faq-layers {
  margin: 0 0 26px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 40, 61, .7) 0%, rgba(10, 23, 38, .5) 100%);
  background-image:
    repeating-linear-gradient(0deg, rgba(185, 198, 210, .07) 0 1px, transparent 1px 32px),
    linear-gradient(180deg, rgba(18, 40, 61, .7) 0%, rgba(10, 23, 38, .5) 100%);
}

.page-faq .faq-layers svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .faq-layers__k {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  fill: var(--green-300);
}

.page-faq .faq-layers__v {
  font-family: var(--font-head);
  font-size: 15px;
  fill: var(--ink);
}

/* ---------- 梯队字段分段控件区 ---------- */
.page-faq .faq-block .segmented {
  margin-bottom: 0;
}

.page-faq .faq-field {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 0;
  background: var(--faq-card);
}

.page-faq .faq-field p {
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--ink);
}

.page-faq .faq-field .card__rows {
  margin-top: 16px;
  border: 1px solid var(--line);
  background: rgba(10, 23, 38, .65);
}

.page-faq .faq-field .data-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.page-faq .faq-field .data-row:first-child {
  border-top: 0;
}

.page-faq .faq-field .data-row__key {
  color: var(--slate);
  flex: none;
}

.page-faq .faq-field .data-row__val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--green-300);
  text-align: right;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-cta {
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(31, 138, 91, .34) 0%, rgba(10, 23, 38, 0) 60%),
    var(--navy-700);
}

.page-faq .faq-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-faq .faq-cta__text {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 窄屏 ---------- */
@media (max-width: 1023px) {
  .page-faq .faq-index {
    display: flex;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .page-faq .faq-index__title {
    display: none;
  }

  .page-faq .faq-index__link {
    flex: none;
    border-top: 0;
    border-left: 1px solid var(--line);
    white-space: nowrap;
  }

  .page-faq .faq-index__link:first-of-type {
    border-left: 0;
  }

  .page-faq .faq-side__cta {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    align-items: center;
  }

  .page-faq .faq-side__cta-title {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-body {
    grid-template-columns: 244px minmax(0, 1fr);
  }

  .page-faq .faq-side__inner {
    position: sticky;
    top: 104px;
  }
}

@media (max-width: 640px) {
  .page-faq .faq-hero__fact {
    flex: 1 1 100%;
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 12px;
  }

  .page-faq .faq-hero__fact:first-child {
    border-top: 0;
  }

  .page-faq .qa__q {
    padding: 14px 14px;
    gap: 9px;
  }

  .page-faq .qa__a {
    padding: 14px 14px 18px 14px;
  }

  .page-faq .faq-layers {
    padding: 12px 10px;
  }

  .page-faq .faq-layers__v {
    font-size: 13px;
  }

  .page-faq .faq-field .data-row {
    flex-direction: column;
    gap: 4px;
    align-items: flex-start;
  }

  .page-faq .faq-field .data-row__val {
    text-align: left;
  }

  .page-faq .faq-cta__actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__idx,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after,
  .page-faq .faq-index__link {
    transition: none;
  }
}