.page-faq {
  --faq-rail-w: 272px;
  --faq-tint: rgba(53, 242, 200, .12);
  --faq-tint-line: rgba(53, 242, 200, .34);
  background: var(--ink);
  color: var(--fg);
  padding-bottom: clamp(56px, 8vw, 112px);
}

/* ── 首屏 ─────────────────────────────── */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(158deg, var(--ink-2) 0%, var(--ink) 62%);
  border-bottom: 1px solid var(--line);
  padding-top: clamp(22px, 3.4vw, 44px);
  padding-bottom: clamp(38px, 5.4vw, 76px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -26%;
  right: -12%;
  width: 46%;
  height: 156%;
  background: linear-gradient(180deg, var(--faq-tint), rgba(53, 242, 200, 0) 72%);
  transform: rotate(6deg);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 34%;
  height: 3px;
  background: var(--cyan);
  transform: skewX(-6deg) translateX(-4px);
  transform-origin: left bottom;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero .eyebrow {
  margin-top: clamp(20px, 3vw, 34px);
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  max-width: 22ch;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.85rem, 5vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -.03em;
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 64ch;
  color: var(--fg-dim);
  font-size: 17px;
  line-height: 1.78;
}

.page-faq .faq-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-faq .faq-hero__stat {
  background: var(--panel);
  padding: 14px 16px 16px;
}

.page-faq .faq-hero__stat dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--fg-dim);
}

.page-faq .faq-hero__stat dd {
  margin: 8px 0 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--fg);
}

.page-faq .faq-hero__stat .num {
  color: var(--cyan);
  font-size: 22px;
  margin-right: 2px;
}

/* ── 左右分屏 ─────────────────────────── */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding-top: clamp(34px, 5vw, 70px);
}

@media (min-width: 1000px) {
  .page-faq .faq-body {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 72px);
    align-items: start;
  }
}

/* ── 左侧主题目录 ─────────────────────── */
.page-faq .faq-rail {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 18px 16px 20px;
}

@media (min-width: 1000px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
  }
}

.page-faq .faq-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-faq .faq-rail__list {
  counter-reset: rail;
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
}

.page-faq .faq-rail__list li {
  background: var(--panel);
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 10px 10px 12px;
  border-left: 2px solid transparent;
  color: var(--fg-dim);
  font-size: 14.5px;
  line-height: 1.45;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-faq .faq-rail__link::before {
  counter-increment: rail;
  content: counter(rail, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--line);
  transition: color var(--dur) var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  color: var(--fg);
  background: var(--panel-2);
  border-left-color: var(--cyan);
}

.page-faq .faq-rail__link:hover::before,
.page-faq .faq-rail__link:focus-visible::before {
  color: var(--cyan);
}

.page-faq .faq-rail__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  color: var(--fg-dim);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-faq .link-inline {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--faq-tint-line);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .link-inline:hover,
.page-faq .link-inline:focus-visible {
  color: var(--fg);
  border-bottom-color: var(--orange);
}

/* ── 右侧问答流 ───────────────────────── */
.page-faq .faq-stream {
  min-width: 0;
}

.page-faq .faq-topic + .faq-topic {
  margin-top: clamp(40px, 6vw, 84px);
}

.page-faq .faq-topic__head {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  scroll-margin-top: 92px;
}

.page-faq .faq-topic__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-faq .faq-topic h2 {
  margin: 8px 0 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  line-height: 1.2;
  letter-spacing: -.02em;
}

.page-faq .faq-topic__intro {
  margin: 10px 0 0;
  max-width: 68ch;
  color: var(--fg-dim);
  font-size: 15.5px;
  line-height: 1.72;
}

.page-faq .faq-qa-group {
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-faq .faq-topic__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 2.8vw, 30px);
  margin-top: clamp(18px, 2.4vw, 28px);
}

@media (min-width: 1140px) {
  .page-faq .faq-topic__cols {
    grid-template-columns: minmax(0, 1fr) minmax(268px, 330px);
    align-items: start;
  }

  .page-faq .faq-topic__cols .faq-qa-group {
    margin-top: 0;
  }
}

/* ── 折叠问答 ─────────────────────────── */
.page-faq .qa {
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  background: var(--panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .qa + .qa {
  margin-top: 10px;
}

.page-faq .qa:hover {
  border-color: var(--line);
  border-left-color: var(--line);
}

.page-faq .qa[open] {
  border-left-color: var(--cyan);
  background: var(--panel-2);
}

.page-faq .qa:target {
  border-color: var(--faq-tint-line);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 48px 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--fg);
  transition: color var(--dur) var(--ease);
}

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

.page-faq .qa__q::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--fg-dim);
  border-bottom: 1.5px solid var(--fg-dim);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  transform: translateY(-30%) rotate(-135deg);
  border-color: var(--cyan);
}

.page-faq .qa__q:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -4px;
}

.page-faq .qa__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--fg-dim);
  transition: color var(--dur) var(--ease);
}

.page-faq .qa[open] .qa__no {
  color: var(--cyan);
}

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

.page-faq .qa__a {
  padding: 0 22px 20px 18px;
  color: var(--fg-dim);
  font-size: 15px;
  line-height: 1.78;
}

.page-faq .qa__a::before {
  content: "";
  display: block;
  height: 1px;
  margin: 0 0 14px;
  background: var(--line-soft);
}

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

.page-faq .qa__a p + p {
  margin-top: 10px;
}

/* ── 字段标签 ─────────────────────────── */
.page-faq .field {
  position: relative;
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--faq-tint-line);
  border-radius: var(--radius);
  background: rgba(53, 242, 200, .08);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  line-height: 1.5;
  cursor: help;
}

.page-faq .field:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-faq .field[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  z-index: 6;
  width: max-content;
  max-width: min(258px, 74vw);
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 12.5px;
  letter-spacing: 0;
  line-height: 1.55;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  pointer-events: none;
}

.page-faq .field[data-tip]:hover::after,
.page-faq .field[data-tip]:focus-visible::after {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* ── 配图 ─────────────────────────────── */
.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

.page-faq .faq-figure--side img {
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

.page-faq .faq-figure--wide {
  margin-top: clamp(20px, 2.8vw, 32px);
}

.page-faq .faq-figure--wide img {
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ── 订阅行动 ─────────────────────────── */
.page-faq .faq-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(20px, 2.8vw, 30px) 0 0;
}

/* ── 纠错反馈面板 ─────────────────────── */
.page-faq .fix-panel {
  margin-top: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  background: var(--panel);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-faq .fix-panel__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-faq .fix-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .fix-list__item {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  color: var(--fg-dim);
  font-size: 14.5px;
  line-height: 1.65;
}

.page-faq .fix-list__box {
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 3px;
  border: 1px solid var(--faq-tint-line);
  background: rgba(53, 242, 200, .08);
  position: relative;
}

.page-faq .fix-list__box::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 1px;
  width: 5px;
  height: 8px;
  border-right: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  transform: rotate(40deg);
}

.page-faq .fix-panel__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  color: var(--fg-dim);
  font-size: 14px;
  line-height: 1.78;
}

/* ── 窄屏收束 ─────────────────────────── */
@media (max-width: 640px) {
  .page-faq .faq-hero h1 {
    max-width: none;
  }

  .page-faq .faq-hero__stat dd {
    font-size: 14px;
  }

  .page-faq .qa__q {
    padding: 14px 42px 14px 14px;
    font-size: 15px;
  }

  .page-faq .qa__a {
    padding: 0 16px 18px 14px;
    font-size: 14.5px;
  }

  .page-faq .fix-panel {
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q::after,
  .page-faq .faq-rail__link,
  .page-faq .faq-rail__link::before,
  .page-faq .field[data-tip]::after {
    transition: none;
  }
}