.page-faq {
  --faq-index-w: 236px;
  --faq-shell-gap: clamp(24px, 3.6vw, 52px);
  color: var(--text);
}

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

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(52px, 8vw, 104px) clamp(38px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-faq .faq-hero__bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-faq .faq-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(120% 90% at 86% 0%, rgba(255, 106, 26, 0.3), transparent 56%),
    radial-gradient(90% 80% at 6% 100%, rgba(36, 224, 207, 0.2), transparent 58%),
    linear-gradient(180deg, rgba(5, 7, 13, 0.44), rgba(5, 7, 13, 0.96) 76%);
}

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

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(46px, 9.5vw, 104px);
  line-height: 0.92;
  letter-spacing: -0.03em;
}

.page-faq .faq-hero__title::before {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-bottom: 18px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-faq .faq-hero__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 780px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-faq .faq-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: rgba(11, 19, 34, 0.84);
}

.page-faq .faq-fact__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ice);
}

.page-faq .faq-fact__v {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
  color: var(--text);
}

.page-faq .faq-fact__v--hot {
  color: var(--orange);
}

/* ---------- 双栏知识库 ---------- */
.page-faq .faq-shell {
  padding-block: clamp(30px, 5vw, 72px) clamp(48px, 8vw, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-shell-gap);
}

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

.page-faq .faq-index {
  border: 1px solid var(--line-soft);
  background: var(--panel);
  padding: 16px;
}

.page-faq .faq-index__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.4;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--text);
  border-left-color: var(--cyan);
  background: rgba(36, 224, 207, 0.08);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

.page-faq .faq-index__foot {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(155, 169, 191, 0.28);
  display: grid;
  gap: 7px;
}

.page-faq .faq-index__foot p {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .faq-index__more {
  justify-self: start;
  font-size: 13px;
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(157, 246, 239, 0.32);
}

.page-faq .faq-index__more:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 分组与问答 ---------- */
.page-faq .faq-group {
  scroll-margin-top: calc(var(--bar-h) + 20px);
  margin-bottom: clamp(34px, 5vw, 58px);
}

.page-faq .faq-group__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-group__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-group__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-faq .faq-qa {
  margin-bottom: 8px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(14, 23, 40, 0.92), rgba(11, 19, 34, 0.92));
  transition: border-color 0.2s var(--ease);
}

.page-faq .faq-qa[open] {
  border-color: var(--line-strong);
  box-shadow: inset 0 0 0 1px rgba(36, 224, 207, 0.06);
}

.page-faq .faq-qa > summary {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) 16px;
  align-items: start;
  gap: 10px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--text);
}

.page-faq .faq-qa > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-qa > summary:hover {
  color: var(--ice);
}

.page-faq .faq-qa > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.4;
  text-align: right;
  color: var(--cyan);
}

.page-faq .faq-qa[open] > summary::after {
  content: "−";
  color: var(--orange);
}

.page-faq .faq-qa__no {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  line-height: 1.9;
  color: var(--muted);
}

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

.page-faq .faq-qa__body {
  padding: 0 16px 18px;
  border-top: 1px solid rgba(155, 169, 191, 0.14);
  padding-top: 14px;
}

.page-faq .faq-qa__body > p {
  margin: 0 0 10px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-faq .faq-link {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(157, 246, 239, 0.35);
}

.page-faq .faq-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 步骤条 */
.page-faq .faq-steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-faq .faq-steps li {
  counter-increment: faqstep;
  position: relative;
  padding-left: 34px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

.page-faq .faq-steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 3px;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  color: var(--ink);
  background: var(--cyan);
}

/* 术语卡 */
.page-faq .faq-term {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 5px;
  margin-top: 12px;
  padding: 11px 13px;
  border-left: 2px solid var(--orange);
  background: rgba(255, 106, 26, 0.07);
}

.page-faq .faq-term__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ember);
}

.page-faq .faq-term__v {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 路径示意图 ---------- */
.page-faq .faq-visual {
  position: relative;
  margin: 0 0 clamp(30px, 4vw, 52px);
  border: 1px solid var(--line-soft);
  background: var(--panel);
}

.page-faq .faq-visual::before {
  content: "PATH / 界面路径";
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--cyan);
}

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

.page-faq .faq-visual figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 联系面板 ---------- */
.page-faq .faq-help {
  scroll-margin-top: calc(var(--bar-h) + 20px);
}

.page-faq .faq-help__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.6vw, 40px);
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(255, 106, 26, 0.22), transparent 55%),
    linear-gradient(180deg, rgba(14, 23, 40, 0.96), rgba(11, 19, 34, 0.96));
}

.page-faq .faq-help__panel::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -12%;
  bottom: -46%;
  width: 320px;
  height: 320px;
  background: repeating-linear-gradient(135deg, rgba(36, 224, 207, 0.14) 0 2px, transparent 2px 12px);
  transform: rotate(8deg);
  pointer-events: none;
}

.page-faq .faq-help__title,
.page-faq .faq-help__prep-lead,
.page-faq .faq-help__prep,
.page-faq .faq-help__contact {
  position: relative;
  z-index: 1;
}

.page-faq .faq-help__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-faq .faq-help__prep-lead {
  margin: 0 0 14px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-help__prep {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 8px;
  max-width: 56ch;
}

.page-faq .faq-help__prep li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-faq .faq-help__prep li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px rgba(61, 242, 160, 0.7);
}

.page-faq .faq-help__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.page-faq .faq-help__contact {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-top: 16px;
  border-top: 1px dashed rgba(155, 169, 191, 0.3);
}

.page-faq .faq-help__contact dt {
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ice);
}

.page-faq .faq-help__contact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  word-break: break-word;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-faq .faq-help__contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-faq .faq-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-qa > summary {
    font-size: 16px;
    padding: 16px 18px;
  }

  .page-faq .faq-qa__body {
    padding-left: 18px;
    padding-right: 18px;
  }
}

@media (min-width: 560px) and (max-width: 959px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 24px;
  }
}

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