/* ===== 使用教程 / page-faq ===== */
.page-faq {
  --faq-gap: clamp(14px, 2.2vw, 28px);
  --faq-num-w: 40px;
  background: var(--bg);
  color: var(--body-text);
}
@media (min-width: 700px) {
  .page-faq { --faq-num-w: 56px; }
}

/* --- 面包屑条 --- */
.page-faq .faq-topstrip {
  background: var(--bg);
  border-bottom: 2px solid var(--bg-3);
}
.page-faq .faq-topstrip .wrap {
  padding-block: 14px;
}
.page-faq .crumbs {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel);
}
.page-faq .crumbs a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .15s var(--ease), border-color .15s var(--ease);
}
.page-faq .crumbs a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* --- 首屏 --- */
.page-faq .faq-intro {
  background:
    radial-gradient(120% 95% at 88% -10%, rgba(200, 255, 61, .10), transparent 58%),
    var(--bg);
  border-bottom: 2px solid var(--bg-3);
}
.page-faq .faq-intro-grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(32px, 5vw, 76px) clamp(28px, 4.5vw, 68px);
  align-items: center;
}
@media (min-width: 900px) {
  .page-faq .faq-intro-grid {
    grid-template-columns: 1.35fr 1fr;
  }
}
.page-faq .faq-h1 {
  margin: 14px 0 0;
  color: var(--white);
  letter-spacing: -.02em;
  text-wrap: balance;
}
.page-faq .faq-h1 em {
  font-style: normal;
  color: var(--lime);
}
.page-faq .faq-intro .lede {
  margin: 22px 0 0;
  max-width: 48ch;
  color: var(--body-text);
}
.page-faq .faq-intro .btn-row {
  margin-top: 28px;
}

/* 首屏图 */
.page-faq .faq-shot {
  margin: 0;
  border: 2px solid var(--bg-3);
  background: var(--bg-2);
  position: relative;
}
.page-faq .faq-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.page-faq .faq-shot-cap {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--steel);
  padding: 10px 14px;
  border-top: 2px solid var(--bg-3);
}

/* --- 三步流程带 --- */
.page-faq .faq-steps {
  background: var(--bg);
  border-bottom: 2px solid var(--bg-3);
  padding-block: clamp(34px, 5vw, 76px);
}
.page-faq .steps-head {
  margin-bottom: 28px;
}
.page-faq .steps-head h2 {
  margin: 10px 0 0;
  color: var(--white);
  letter-spacing: -.01em;
}
.page-faq .steps-band {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 2px solid var(--lime);
}
.page-faq .step-cell {
  padding: 24px 0 26px;
  border-bottom: 2px solid var(--bg-3);
}
.page-faq .step-cell:last-child { border-bottom: none; }
.page-faq .step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(46px, 8vw, 76px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-faq .step-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--white);
}
.page-faq .step-cell p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-text);
  max-width: 36ch;
}
.page-faq .step-cell a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  white-space: nowrap;
}
@media (min-width: 780px) {
  .page-faq .steps-band {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-faq .step-cell {
    padding: 30px 28px 34px;
    border-bottom: none;
    border-left: 2px solid var(--bg-3);
  }
  .page-faq .step-cell:first-child {
    border-left: none;
    padding-left: 0;
  }
}

/* --- 问答区 --- */
.page-faq .qa-area {
  background: var(--bg-2);
  border-bottom: 2px solid var(--bg-3);
  padding-block: clamp(36px, 5vw, 84px);
}
.page-faq .qa-head-block {
  display: grid;
  gap: 14px;
  align-items: end;
}
@media (min-width: 860px) {
  .page-faq .qa-head-block {
    grid-template-columns: 1fr auto;
  }
}
.page-faq .qa-head-block h2 {
  margin: 10px 0 0;
  color: var(--white);
  letter-spacing: -.01em;
}
.page-faq .qa-hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--steel);
}

/* 筛选按钮 */
.page-faq .filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
  padding-bottom: 26px;
  border-bottom: 2px solid var(--bg-3);
}
.page-faq .filter-btn {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  padding: 9px 14px;
  background: transparent;
  color: var(--steel);
  border: 2px solid var(--line);
  cursor: pointer;
  transition: color .15s var(--ease), border-color .15s var(--ease), background-color .15s var(--ease);
}
.page-faq .filter-btn:hover {
  color: var(--white);
  border-color: var(--steel);
}
.page-faq .filter-btn.is-active {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--bg);
  font-weight: 700;
}

/* 分组 */
.page-faq .qa-groups {
  margin-top: 36px;
}
.page-faq .qa-group + .qa-group {
  margin-top: 48px;
}
.page-faq .qa-group:not(:has(.qa:not(.is-hidden))) {
  display: none;
}
.page-faq .qa-group-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--lime);
  margin-bottom: 0;
}
.page-faq .qa-group-head .eyebrow {
  color: var(--lime);
}
.page-faq .qa-group-range {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--steel);
  font-variant-numeric: tabular-nums;
}

/* 单条问答 */
.page-faq .qa {
  border-left: 2px solid var(--lime);
  border-bottom: 1px solid var(--line);
  background: transparent;
  transition: background-color .18s var(--ease);
}
.page-faq .qa[open] {
  background: var(--bg-3);
}
.page-faq .qa.is-hidden {
  display: none;
}
.page-faq .qa-head {
  display: grid;
  grid-template-columns: var(--faq-num-w) 1fr 16px;
  gap: 0 12px;
  align-items: start;
  padding: 18px 16px;
  cursor: pointer;
  list-style: none;
  transition: background-color .15s var(--ease);
}
.page-faq .qa-head::-webkit-details-marker { display: none; }
.page-faq .qa-head::marker { content: ""; }
.page-faq .qa-head:hover {
  background: rgba(200, 255, 61, .06);
}
.page-faq .qa-num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--lime-2);
  font-variant-numeric: tabular-nums;
}
.page-faq .qa[open] .qa-num {
  color: var(--lime);
}
.page-faq .qa-q {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--white);
}
@media (min-width: 700px) {
  .page-faq .qa-q { font-size: 18px; }
}
.page-faq .qa-ind {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 7px;
  justify-self: end;
}
.page-faq .qa-ind::before,
.page-faq .qa-ind::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}
.page-faq .qa-ind::before {
  left: 0; top: 6px; width: 14px; height: 2px;
}
.page-faq .qa-ind::after {
  left: 6px; top: 0; width: 2px; height: 14px;
}
.page-faq .qa[open] .qa-ind::after {
  transform: scaleY(0);
  opacity: 0;
}
.page-faq .qa-body {
  padding: 0 16px 20px calc(16px + var(--faq-num-w) + 12px);
}
.page-faq .qa-body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--body-text);
  max-width: 60ch;
}
.page-faq .qa-body a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 中段图 */
.page-faq .qa-break {
  margin: 44px 0 0;
  border: 2px solid var(--bg-3);
  background: var(--bg);
}
.page-faq .qa-break img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-faq .qa-break figcaption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--steel);
  padding: 10px 14px;
  border-top: 2px solid var(--bg-3);
}
@media (min-width: 860px) {
  .page-faq .qa-break {
    max-width: 620px;
    margin-left: auto;
    margin-right: 0;
  }
}

/* --- 收尾 --- */
.page-faq .faq-tail {
  background: var(--bg);
  padding-block: clamp(36px, 5vw, 78px);
}
.page-faq .faq-tail-grid {
  display: grid;
  gap: 26px;
}
@media (min-width: 860px) {
  .page-faq .faq-tail-grid {
    grid-template-columns: 1.4fr auto;
    align-items: end;
  }
}
.page-faq .faq-tail-grid h2 {
  margin: 10px 0 0;
  color: var(--white);
  letter-spacing: -.01em;
}
.page-faq .faq-tail-text {
  margin: 16px 0 0;
  max-width: 52ch;
  color: var(--body-text);
  line-height: 1.75;
}
.page-faq .faq-tail .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
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