/* ===== 使用指南（/help-center/） ===== */

.page-faq {
  --faq-rail-w: 200px;
  --faq-line: rgba(31, 107, 82, 0.45);
  background: var(--ink-deep);
  color: var(--warm);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  padding: clamp(1.6rem, 5vw, 3rem) 0 clamp(1.9rem, 5vw, 3.1rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(900px 340px at 6% -22%, rgba(255, 107, 26, 0.16), transparent 64%),
    radial-gradient(700px 320px at 97% -12%, rgba(61, 220, 255, 0.12), transparent 68%);
}

.page-faq .breadcrumb {
  margin-bottom: clamp(1rem, 3vw, 1.5rem);
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.15rem, 8.2vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 0.55rem 0 0;
  max-width: 18ch;
  color: var(--warm);
}

.page-faq .faq-hero__title em {
  font-style: normal;
  color: var(--flame);
}

.page-faq .faq-hero__lede {
  max-width: 60ch;
  margin: clamp(0.9rem, 2.6vw, 1.3rem) 0 0;
  font-size: clamp(1rem, 2.4vw, 1.08rem);
  color: var(--mist);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(1.4rem, 4vw, 2.1rem) 0 0;
  padding: 0;
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--faq-line);
}

.page-faq .faq-hero__fact {
  background: var(--ink-mid);
  padding: 0.85rem 1.05rem;
}

.page-faq .faq-hero__fact dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--flame-mist);
}

.page-faq .faq-hero__fact dd {
  margin: 0.3rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3.6vw, 1.45rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--warm);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-body {
  padding: clamp(2rem, 5vw, 3.4rem) 0 0;
}

.page-faq .faq-shell {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-faq .faq-shell > * {
  min-width: 0;
}

@media (min-width: 980px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }
}

/* ---------- 锚点轨道 ---------- */

.page-faq .faq-rail__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--flame-mist);
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--flame);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  background: var(--ink-mid);
  border-color: var(--line);
  color: var(--warm);
}

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

@media (min-width: 980px) {
  .page-faq .faq-rail {
    position: sticky;
    top: 1.75rem;
    align-self: start;
  }
  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 0.12rem;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-faq .faq-rail__link {
    white-space: normal;
  }
}

/* ---------- 分区 ---------- */

.page-faq .faq-cat {
  scroll-margin-top: clamp(1.5rem, 7vh, 5rem);
  padding-top: clamp(1.6rem, 4vw, 2.4rem);
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-main > .faq-cat:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-cat + .faq-cat {
  margin-top: clamp(2.3rem, 5vw, 3.6rem);
}

.page-faq .faq-cat__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(0.7rem, 2vw, 1.1rem);
  align-items: baseline;
  margin-bottom: clamp(1.05rem, 3vw, 1.7rem);
}

.page-faq .faq-cat__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  align-self: start;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 7vw, 3rem);
  font-weight: 800;
  line-height: 0.82;
  color: var(--flame);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-faq .faq-cat__num {
    color: transparent;
    -webkit-text-stroke: 1.5px var(--flame);
  }
}

.page-faq .faq-cat__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4.4vw, 2.1rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-faq .faq-cat__sub {
  grid-column: 2;
  grid-row: 2;
  margin: 0.45rem 0 0;
  max-width: 58ch;
  font-size: 0.94rem;
  color: var(--mist);
}

/* ---------- 五步走 ---------- */

.page-faq .faq-steps {
  list-style: none;
  margin: 0 0 clamp(1.3rem, 3.5vw, 1.9rem);
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--faq-line);
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  column-gap: 0.35rem;
  background: var(--ink-night);
  padding: 1rem 1.05rem;
  transition: background-color 180ms var(--ease);
}

.page-faq .faq-step:hover {
  background: var(--ink-mid);
}

.page-faq .faq-step__n {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--flame);
}

.page-faq .faq-step__t {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--warm);
}

.page-faq .faq-step__d {
  grid-column: 2;
  grid-row: 2;
  margin: 0.2rem 0 0;
  font-size: 0.93rem;
  color: var(--mist);
}

.page-faq .faq-step__d a {
  color: var(--volt);
  text-decoration-color: var(--line-volt);
  text-underline-offset: 3px;
}

.page-faq .faq-step__d a:hover {
  color: var(--flame-mist);
}

@media (min-width: 760px) {
  .page-faq .faq-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-faq .faq-step:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

/* ---------- 手风琴 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
}

.page-faq .faq-item {
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  background: var(--ink-mid);
  overflow: hidden;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-item[open] {
  border-color: rgba(255, 107, 26, 0.55);
  background-image: linear-gradient(180deg, rgba(255, 107, 26, 0.1), transparent 46%);
}

.page-faq .faq-item__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.5rem 0.8rem;
  padding: 0.95rem 1.05rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.8vw, 1.2rem);
  font-weight: 700;
  line-height: 1.38;
  color: var(--warm);
  transition: color 180ms var(--ease);
}

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

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

.page-faq .faq-item__q:hover {
  color: var(--flame-mist);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: -3px;
}

.page-faq .faq-item__idx {
  padding-top: 0.24rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--flame);
}

.page-faq .faq-item__sign {
  position: relative;
  align-self: start;
  width: 22px;
  height: 22px;
  margin-top: 0.14rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--flame);
  flex: none;
}

.page-faq .faq-item__sign::before,
.page-faq .faq-item__sign::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: currentColor;
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.page-faq .faq-item__sign::before {
  width: 9px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item__sign::after {
  width: 1.5px;
  height: 9px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-item[open] .faq-item__sign {
  border-color: var(--flame);
}

.page-faq .faq-item[open] .faq-item__sign::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 0.85rem 1.05rem 1.05rem;
  border-top: 1px dashed var(--line);
  font-size: 0.97rem;
  color: var(--warm);
}

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

.page-faq .faq-item__a p + p {
  margin-top: 0.6rem;
}

.page-faq .faq-item__a a {
  color: var(--volt);
  text-decoration-color: var(--line-volt);
  text-underline-offset: 3px;
}

.page-faq .faq-item__a a:hover {
  color: var(--flame-mist);
}

.page-faq .faq-item[open] .faq-item__a {
  animation: faq-reveal 200ms var(--ease) both;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 640px) {
  .page-faq .faq-item__a {
    padding-left: 3.1rem;
  }
}

/* ---------- 合作路径 ---------- */

.page-faq .faq-routes {
  display: grid;
  gap: 1px;
  margin: 0 0 clamp(1.2rem, 3vw, 1.7rem);
  border: 1px solid var(--faq-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--faq-line);
}

.page-faq .faq-route {
  background: var(--ink-night);
  padding: 1.1rem 1.15rem;
  transition: background-color 180ms var(--ease);
}

.page-faq .faq-route:hover {
  background: var(--ink-mid);
}

.page-faq .faq-route__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--volt);
}

.page-faq .faq-route__t {
  margin: 0.45rem 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--warm);
}

.page-faq .faq-route__d {
  margin: 0;
  font-size: 0.92rem;
  color: var(--mist);
}

@media (min-width: 820px) {
  .page-faq .faq-routes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 反馈流程 ---------- */

.page-faq .faq-flow {
  counter-reset: faqflow;
  list-style: none;
  margin: 0 0 clamp(1.3rem, 3.5vw, 1.9rem);
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-faq .faq-flow__item {
  border-left: 2px solid var(--line);
  padding: 0.1rem 0 0.1rem 0.85rem;
}

.page-faq .faq-flow__item::before {
  counter-increment: faqflow;
  content: "0" counter(faqflow);
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--volt);
}

.page-faq .faq-flow__t {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--warm);
}

.page-faq .faq-flow__d {
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-faq .faq-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
  }
}

/* ---------- 更新记录 ---------- */

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

.page-faq .faq-log__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.2rem 0.9rem;
  align-items: baseline;
  background: var(--ink-night);
  padding: 0.95rem 1.05rem;
}

.page-faq .faq-log__v {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--flame);
}

.page-faq .faq-log__t {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--warm);
}

.page-faq .faq-log__d {
  grid-column: 2;
  grid-row: 2;
  margin: 0.15rem 0 0;
  font-size: 0.92rem;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-faq .faq-log__item {
    grid-template-columns: auto minmax(0, 13rem) minmax(0, 1fr);
  }
  .page-faq .faq-log__d {
    grid-column: 3;
    grid-row: 1;
    margin: 0;
  }
}

/* ---------- 图片 ---------- */

.page-faq .faq-fig {
  margin: clamp(1.2rem, 3.5vw, 1.9rem) 0 0;
}

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

/* ---------- 结尾入口 ---------- */

.page-faq .faq-cta {
  position: relative;
  margin-top: clamp(2.4rem, 6vw, 3.8rem);
  padding: clamp(1.4rem, 4vw, 2.2rem);
  border: 1px solid rgba(255, 107, 26, 0.4);
  border-radius: var(--r-lg);
  background:
    radial-gradient(560px 220px at 0% 0%, rgba(255, 107, 26, 0.18), transparent 68%),
    var(--ink-mid);
}

.page-faq .faq-cta__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--flame-mist);
}

.page-faq .faq-cta__text {
  margin: 0.6rem 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 2.5vw, 1.1rem);
  color: var(--warm);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1rem, 3vw, 1.5rem);
}

/* ---------- 动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item[open] .faq-item__a {
    animation: none;
  }
  .page-faq .faq-step,
  .page-faq .faq-route,
  .page-faq .faq-item,
  .page-faq .faq-item__q,
  .page-faq .faq-rail__link,
  .page-faq .faq-item__sign::before,
  .page-faq .faq-item__sign::after {
    transition-duration: 0.01ms;
  }
}