.page-faq {
  background: var(--ink-0);
  color: var(--white);
}

.page-faq .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 24px);
  display: flex;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fog);
}

.page-faq .breadcrumb__link {
  color: var(--cyan);
  text-decoration: none;
}

.page-faq .breadcrumb__link:hover,
.page-faq .breadcrumb__link:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(24px, 4vw, 52px) 0 clamp(34px, 6vw, 76px);
  background:
    radial-gradient(760px 380px at 10% 0%, rgba(53, 242, 227, 0.13), transparent 64%),
    radial-gradient(640px 340px at 94% 14%, rgba(139, 92, 246, 0.14), transparent 68%),
    var(--ink-0);
  border-bottom: 1px solid var(--ink-2);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: 1fr;
  align-items: center;
}

.page-faq .faq-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.4vw, 52px);
  line-height: 1.16;
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-faq .faq-hero .lede {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-faq .faq-hero__stats {
  margin: 30px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-2);
  border: 1px solid var(--ink-2);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}

.page-faq .faq-stat {
  background: var(--ink-1);
  padding: 14px 16px;
}

.page-faq .faq-stat dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-faq .faq-stat dd {
  margin: 6px 0 0;
  font-size: 15px;
  color: var(--white);
}

.page-faq .faq-stat dd .data-num {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--cyan);
  margin-right: 4px;
}

.page-faq .faq-hero__media .media-frame {
  width: 100%;
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
  clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
  overflow: hidden;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-faq .faq-hero__caption {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- 技能树主体 ---------- */
.page-faq .faq-tree {
  padding-top: clamp(40px, 6vw, 88px);
}

.page-faq .faq-tree__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-faq .faq-tree__nav {
  border: 1px solid var(--ink-2);
  background: var(--ink-1);
  padding: 20px;
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
}

.page-faq .faq-steps {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .faq-steps__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 12px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--fog);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--t) var(--ease), background var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-faq .faq-steps__link .u-mono {
  font-size: 12px;
  color: var(--ink-2);
  color: var(--cyan);
  opacity: 0.72;
}

.page-faq .faq-steps__link:hover,
.page-faq .faq-steps__link:focus-visible {
  color: var(--white);
  background: rgba(53, 242, 227, 0.08);
  border-left-color: var(--cyan);
}

.page-faq .faq-tree__tip {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--ink-2);
}

.page-faq .faq-tree__tip p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fog);
}

.page-faq .faq-tree__tip .tag {
  margin: 0;
}

.page-faq .faq-tree__body {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

.page-faq .faq-group {
  scroll-margin-top: 96px;
}

.page-faq .faq-group__head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ink-2);
}

.page-faq .faq-node {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-0);
  background: var(--cyan);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.page-faq .faq-group__head h2 {
  margin: 4px 0 0;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.3;
  color: var(--white);
}

.page-faq .faq-group__intro {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fog);
}

.page-faq .faq-list {
  margin-top: 8px;
  display: grid;
  gap: 8px;
}

.page-faq .faq-item {
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-faq .faq-item:hover,
.page-faq .faq-item[open] {
  border-color: rgba(53, 242, 227, 0.55);
  background: var(--ink-1);
}

.page-faq .faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.65;
  color: var(--white);
}

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

.page-faq .faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.2;
  color: var(--cyan);
}

.page-faq .faq-item[open] summary::after {
  content: "\2212";
}

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

.page-faq .faq-item__body {
  padding: 0 18px 18px;
  border-top: 1px dashed var(--ink-2);
  margin-top: 2px;
  padding-top: 14px;
}

.page-faq .faq-item__body p,
.page-faq .faq-item__body li {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--fog);
}

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

.page-faq .faq-item__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 227, 0.5);
}

.page-faq .faq-item__body a:hover,
.page-faq .faq-item__body a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-faq .faq-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .faq-points li {
  padding-left: 14px;
  position: relative;
}

.page-faq .faq-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--violet);
  transform: rotate(45deg);
}

.page-faq .faq-points .u-mono {
  color: var(--cyan);
  font-size: 13px;
  margin-right: 6px;
}

/* ---------- 版本分档 ---------- */
.page-faq .faq-versions {
  margin-top: 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .faq-version {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
  border-top-width: 3px;
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-faq .faq-version:hover {
  transform: translateY(-4px);
}

.page-faq .faq-version--stable {
  border-top-color: var(--green);
}

.page-faq .faq-version--perf {
  border-top-color: var(--cyan);
}

.page-faq .faq-version--beta {
  border-top-color: var(--violet);
}

.page-faq .faq-version .tag {
  margin: 0;
}

.page-faq .faq-version h3 {
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-faq .faq-version p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-version .faq-version__line {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--ink-2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber);
}

.page-faq .faq-version__line .u-mono {
  color: var(--fog);
  margin-right: 8px;
}

.page-faq .faq-version__media {
  margin-top: 16px;
}

.page-faq .faq-version__media .media-frame {
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
  overflow: hidden;
  clip-path: polygon(16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%, 0 16px);
}

.page-faq .faq-version__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 5 / 3;
}

.page-faq .faq-group--version .faq-list {
  margin-top: 20px;
}

/* ---------- 联系支持 ---------- */
.page-faq .faq-support {
  padding-top: clamp(48px, 7vw, 104px);
  padding-bottom: clamp(48px, 7vw, 104px);
  background:
    linear-gradient(120deg, rgba(53, 242, 227, 0.1), rgba(139, 92, 246, 0.08) 55%, rgba(255, 106, 43, 0.09)),
    var(--ink-1);
  border-top: 1px solid var(--ink-2);
}

.page-faq .faq-support__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-faq .faq-support h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.3;
  color: var(--white);
}

.page-faq .faq-support__lede {
  margin: 14px 0 22px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
}

.page-faq .faq-support__panel {
  display: grid;
  gap: 1px;
  background: var(--ink-2);
  border: 1px solid var(--ink-2);
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
}

.page-faq .faq-contact__row {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  background: var(--ink-0);
}

.page-faq .faq-contact__row .footer-contact__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

.page-faq .faq-contact__value {
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
  text-decoration: none;
  word-break: break-word;
}

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

.page-faq .faq-contact__row--note .faq-contact__value {
  font-size: 13.5px;
  color: var(--fog);
}

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

  .page-faq .faq-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: 7fr 5fr;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-faq .faq-tree__inner {
    grid-template-columns: 300px minmax(0, 1fr);
  }

  .page-faq .faq-tree__nav {
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-group {
    position: relative;
    padding-left: 76px;
  }

  .page-faq .faq-group .faq-node {
    position: absolute;
    left: 0;
    top: 0;
  }

  .page-faq .faq-group::before {
    content: "";
    position: absolute;
    left: 21px;
    top: 56px;
    bottom: -32px;
    width: 2px;
    background: linear-gradient(180deg, rgba(53, 242, 227, 0.75), rgba(53, 242, 227, 0));
  }

  .page-faq .faq-group:last-child::before {
    display: none;
  }

  .page-faq .faq-support__inner {
    grid-template-columns: 6fr 6fr;
    gap: clamp(32px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-version:hover {
    transform: none;
  }

  .page-faq .faq-steps__link,
  .page-faq .faq-item,
  .page-faq .faq-version {
    transition: none;
  }
}