.page-faq {
  --faq-bar-w: 3px;
  --faq-sec-gap: clamp(2.25rem, 6vw, 4.25rem);
  --faq-branch-line: 2px;
  padding-bottom: clamp(1rem, 3vw, 2rem);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(1.25rem, 3.5vw, 2.5rem) 0 clamp(1.75rem, 5vw, 3.25rem);
  position: relative;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: -12% -6% auto auto;
  width: min(48vw, 520px);
  height: min(48vw, 520px);
  border-radius: 50%;
  background: radial-gradient(circle at 60% 40%, rgba(0, 229, 255, 0.1), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

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

.page-faq .faq-hero .breadcrumbs {
  margin: 0 0 clamp(1rem, 2.6vw, 1.75rem);
}

.page-faq .faq-hero__copy {
  max-width: min(100%, 60rem);
}

.page-faq .faq-hero__copy h1 {
  margin: 0.7rem 0 0;
  font-size: var(--step-4);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--ice);
}

.page-faq .faq-hero__copy .lede {
  margin: clamp(0.9rem, 2vw, 1.3rem) 0 0;
  max-width: 34em;
  color: var(--silver);
  line-height: 1.78;
}

.page-faq .faq-hero__media {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--night-2);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 600;
  object-fit: cover;
}

/* ---------- 主体骨架 ---------- */
.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3rem);
  align-items: start;
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
}

/* ---------- 侧栏锚点导航 ---------- */
.page-faq .faq-anchors {
  align-self: start;
}

.page-faq .faq-anchors__list {
  list-style: none;
  margin: 0.7rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.page-faq .faq-anchors__list a {
  display: block;
  padding: 0.3rem 0.72rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--step--1);
  color: var(--silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .faq-anchors__list a:hover,
.page-faq .faq-anchors__list a:focus-visible {
  color: var(--cyan);
  border-color: rgba(0, 229, 255, 0.45);
  background: rgba(0, 229, 255, 0.06);
}

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

/* ---------- 问答分区 ---------- */
.page-faq .faq-sec {
  padding-top: var(--faq-sec-gap);
}

.page-faq .faq-sec:first-child {
  padding-top: 0;
}

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

.page-faq .faq-sec__head {
  max-width: 44rem;
}

.page-faq .faq-sec__head h2 {
  margin: 0.55rem 0 0;
  font-size: var(--step-3);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.022em;
  color: var(--ice);
}

.page-faq .faq-sec__intro {
  margin: 0.85rem 0 0;
  max-width: 34em;
  color: var(--silver);
  line-height: 1.78;
}

/* ---------- 三档判定卡 ---------- */
.page-faq .tier-tree {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-faq .tier-tree__node {
  --node-accent: var(--silver);
  position: relative;
  padding: 1.05rem 1.15rem 1.15rem;
  border: 1px solid var(--line);
  border-top: var(--faq-branch-line) solid var(--node-accent);
  border-radius: 0 0 var(--radius) var(--radius);
  background: linear-gradient(180deg, rgba(18, 40, 61, 0.78), rgba(11, 27, 43, 0.48));
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-faq .tier-tree__node--instant {
  --node-accent: var(--cyan);
}

.page-faq .tier-tree__node--h24 {
  --node-accent: var(--orange);
}

.page-faq .tier-tree__node--std {
  --node-accent: var(--silver);
}

.page-faq .tier-tree__node:hover,
.page-faq .tier-tree__node:focus-within {
  border-color: var(--node-accent);
  background: linear-gradient(180deg, rgba(18, 40, 61, 1), rgba(11, 27, 43, 0.85));
  box-shadow: 0 24px 48px -34px rgba(0, 0, 0, 0.95);
}

.page-faq .tier-tree__label {
  margin: 0.65rem 0 0;
  font-size: var(--step-0);
  font-weight: 600;
  line-height: 1.6;
  color: var(--ice);
}

.page-faq .tier-tree__limit {
  margin: 0.5rem 0 0;
  font-size: var(--step--1);
  color: var(--silver);
  letter-spacing: 0.01em;
}

/* ---------- 季度轴 ---------- */
.page-faq .quarter-axis {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem 0.6rem;
}

.page-faq .quarter-axis__item {
  position: relative;
  padding: 0.95rem 0.4rem 0 0;
  border-top: 1px solid var(--line-strong);
  font-size: var(--step-0);
  font-weight: 600;
  line-height: 1.5;
  color: var(--ice);
}

.page-faq .quarter-axis__item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--violet);
}

.page-faq .quarter-axis__meta {
  display: block;
  margin-top: 0.3rem;
  font-size: var(--step--1);
  font-weight: 400;
  color: var(--silver);
  letter-spacing: 0.01em;
}

/* ---------- 数据带 ---------- */
.page-faq .faq-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-stats > div {
  padding: 1rem 1.1rem 1.1rem;
  background: rgba(18, 40, 61, 0.7);
}

.page-faq .faq-stats dt {
  font-size: var(--step--1);
  color: var(--silver);
  letter-spacing: 0.04em;
}

.page-faq .faq-stats dd {
  margin: 0.4rem 0 0;
  font-size: var(--step-2);
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--cyan);
}

/* ---------- 问答列表与折叠块 ---------- */
.page-faq .qa-list {
  margin: clamp(1.5rem, 3.5vw, 2.25rem) 0 0;
  display: grid;
  gap: 0.3rem;
}

.page-faq .qa-list--flush {
  margin-top: 0;
}

.page-faq .qa {
  border-left: var(--faq-bar-w) solid var(--line-strong);
  padding: 0.9rem 0 0.9rem clamp(0.85rem, 2.4vw, 1.35rem);
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-faq .qa--instant {
  border-left-color: rgba(0, 229, 255, 0.72);
}

.page-faq .qa--h24 {
  border-left-color: rgba(255, 107, 53, 0.72);
}

.page-faq .qa--std {
  border-left-color: rgba(168, 179, 189, 0.6);
}

.page-faq .qa[open] {
  background: linear-gradient(90deg, rgba(18, 40, 61, 0.72), rgba(18, 40, 61, 0));
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-faq .qa__sum {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding-right: 0.2rem;
  cursor: pointer;
  list-style: none;
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ice);
  transition: color 200ms var(--ease);
}

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

.page-faq .qa__sum::marker {
  content: "";
}

.page-faq .qa__sum:hover {
  color: var(--cyan);
}

.page-faq .qa__sum:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 4px;
}

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

.page-faq .qa__sign {
  flex: 0 0 auto;
  position: relative;
  width: 1.05em;
  height: 1.05em;
  margin-top: 0.36em;
  color: var(--silver);
  transition: color 200ms var(--ease);
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  margin-top: -1px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 240ms var(--ease);
}

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

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

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

.page-faq .qa__body {
  padding: 0.7rem 1.5rem 0 0;
}

.page-faq .qa__body p {
  margin: 0 0 0.6rem;
  max-width: 34em;
  font-size: var(--step-0);
  line-height: 1.78;
  color: var(--silver);
}

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

.page-faq .qa__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .qa__foot {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.01em;
  color: var(--silver);
  opacity: 0.72;
}

/* ---------- 图文分栏 ---------- */
.page-faq .faq-split {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-faq .faq-split__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--night-2);
}

.page-faq .faq-split__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 联系方式（纯文本） ---------- */
.page-faq .contact-plain {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-faq .contact-plain li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1.25rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.page-faq .contact-plain__k {
  flex: 0 0 5.5em;
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-faq .contact-plain__v {
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--step-0);
  color: var(--ice);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-faq .contact-note {
  margin: 1.15rem 0 0;
  max-width: 38em;
  font-size: var(--step--1);
  line-height: 1.78;
  color: var(--silver);
}

.page-faq .contact-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .quarter-axis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.5rem;
  }

  .page-faq .tier-tree {
    gap: 1rem;
  }
}

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

  .page-faq .qa-list {
    gap: 0.4rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(0, 1fr) 190px;
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

  .page-faq .faq-anchors {
    position: sticky;
    top: 1.75rem;
    padding-left: 1.1rem;
    border-left: 1px solid var(--line);
  }

  .page-faq .faq-anchors__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.12rem;
  }

  .page-faq .faq-anchors__list a {
    padding: 0.34rem 0.6rem;
    border-color: transparent;
    border-radius: 6px;
    white-space: normal;
  }

  .page-faq .qa__sum {
    font-size: var(--step-1);
  }
}

@media (min-width: 1240px) {
  .page-faq .faq-hero__copy .lede {
    max-width: 36em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .qa,
  .page-faq .qa__sum,
  .page-faq .tier-tree__node,
  .page-faq .faq-anchors__list a {
    transition: none;
  }
}