.page-faq {
  background: var(--ink-900);
  color: var(--text-100);
}

.page-faq .breadcrumb {
  padding-top: 20px;
  padding-bottom: 4px;
  font-size: 13px;
  color: var(--text-400);
}

.page-faq .breadcrumb a {
  color: var(--text-400);
  text-decoration: none;
}

.page-faq .breadcrumb a:hover {
  color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(20px, 4vw, 44px) 0 clamp(32px, 5vw, 64px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--line-500);
}

.page-faq .faq-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-faq .faq-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan-200);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 13em;
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-400);
}

.page-faq .faq-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-500);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-faq .faq-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-faq .faq-hero__facts strong {
  font-size: 20px;
  font-weight: 500;
  color: var(--cyan-200);
  letter-spacing: 0.02em;
}

.page-faq .faq-hero__facts span {
  font-size: 12px;
  color: var(--text-400);
}

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

.page-faq .faq-hero__frame {
  position: relative;
  margin: 0;
  padding: 14px;
  background: var(--ink-800);
  border: 1px solid var(--line-500);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
}

.page-faq .faq-hero__frame::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 38px;
  height: 38px;
  border-top: 2px solid var(--cyan-400);
  border-left: 2px solid var(--cyan-400);
}

.page-faq .faq-hero__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-500);
  object-fit: cover;
}

.page-faq .faq-hero__frame figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-400);
}

/* ---------- 检索区 ---------- */
.page-faq .faq-find {
  padding: clamp(32px, 5vw, 60px) 0;
  background: var(--ink-800);
  border-bottom: 1px solid var(--line-500);
}

.page-faq .faq-find__head h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-faq .faq-find__lead {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-400);
}

.page-faq .faq-search {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 16px 16px;
  background: var(--ink-900);
  border: 1px solid var(--line-500);
  border-radius: var(--radius);
  transition: border-color 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-faq .faq-search:focus-within {
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 1px var(--cyan-400);
}

.page-faq .faq-search__label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan-200);
}

.page-faq .faq-search__input {
  width: 100%;
  padding: 6px 0;
  background: transparent;
  border: 0;
  outline: none;
  color: var(--text-100);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
}

.page-faq .faq-search__input::placeholder {
  color: var(--text-400);
}

.page-faq .faq-search__hint {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-400);
}

.page-faq .faq-cats {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-faq .faq-cats a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-700);
  border: 1px solid var(--line-500);
  border-radius: var(--radius);
  color: var(--text-100);
  font-size: 15px;
  text-decoration: none;
  transition: transform 160ms var(--ease), border-color 160ms var(--ease);
}

.page-faq .faq-cats a:hover,
.page-faq .faq-cats a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan-400);
}

.page-faq .faq-cats .mono {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan-200);
}

/* ---------- 问答组 ---------- */
.page-faq .faq-group {
  padding: clamp(32px, 5vw, 64px) 0;
  border-bottom: 1px solid var(--line-500);
}

.page-faq .faq-group--alt {
  background: var(--ink-800);
}

.page-faq .faq-group__code {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan-200);
}

.page-faq .faq-group__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 33px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  max-width: 22em;
}

.page-faq .faq-group__lead {
  margin: 12px 0 0;
  max-width: 64ch;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-400);
}

.page-faq .faq-list {
  margin-top: 26px;
}

.page-faq .qa {
  border-top: 1px solid var(--line-500);
}

.page-faq .qa:last-of-type {
  border-bottom: 1px solid var(--line-500);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 16px 4px;
  list-style: none;
  cursor: pointer;
  transition: background 160ms var(--ease);
}

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

.page-faq .qa__q::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.15;
  color: var(--cyan-400);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

.page-faq .qa[open] .qa__q {
  background: var(--ink-700);
}

.page-faq .qa__idx {
  padding-top: 3px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan-200);
}

.page-faq .qa__title {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--text-100);
}

.page-faq .qa__a {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding: 14px 4px 22px;
}

.page-faq .qa__body p {
  margin: 0;
  max-width: 64ch;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-100);
}

.page-faq .qa__body a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .steps {
  list-style: none;
  margin: 0;
  padding: 14px 16px;
  background: var(--ink-900);
  border-left: 2px solid var(--cyan-400);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-faq .steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-400);
}

.page-faq .steps .mono {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan-200);
}

/* ---------- 小屏端专栏 ---------- */
.page-faq .faq-screen {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-faq .faq-screen__figure {
  margin: 0;
  padding: 12px;
  background: var(--ink-900);
  border: 1px solid var(--line-500);
  border-radius: var(--radius);
  align-self: start;
}

.page-faq .faq-screen__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border: 1px solid var(--line-500);
}

.page-faq .faq-screen__figure figcaption {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-400);
}

/* ---------- 术语表 ---------- */
.page-faq .faq-terms {
  padding: clamp(32px, 5vw, 64px) 0;
  background: var(--paper-050);
  color: #0B1421;
}

.page-faq .faq-terms__head h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: #0B1421;
}

.page-faq .faq-terms__lead {
  margin: 12px 0 0;
  max-width: 62ch;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.8;
  color: #3B4B60;
}

.page-faq .terms-list {
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid #C6D2E0;
}

.page-faq .term {
  padding: 16px 0;
  border-bottom: 1px solid #C6D2E0;
}

.page-faq .term dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: #0E7C8A;
}

.page-faq .term dd {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #2A3A4D;
}

.page-faq .term dd a {
  color: #B45A00;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 结尾通道 ---------- */
.page-faq .faq-cta {
  padding: clamp(32px, 5vw, 72px) 0;
}

.page-faq .faq-cta__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: clamp(22px, 4vw, 42px);
  background: var(--ink-800);
  border: 1px solid var(--cyan-400);
  border-radius: var(--radius);
  box-shadow: var(--shadow-2);
}

.page-faq .faq-cta__text h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-faq .faq-cta__text p {
  margin: 12px 0 0;
  max-width: 58ch;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-400);
}

.page-faq .faq-cta__panel .btn {
  justify-self: start;
}

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

  .page-faq .faq-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .qa__q {
    padding: 18px 6px;
  }

  .page-faq .qa__a {
    padding: 14px 6px 24px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-faq .faq-cats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .qa__a {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 24px;
  }

  .page-faq .faq-screen {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 32px;
  }

  .page-faq .terms-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 56px;
  }

  .page-faq .faq-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-faq .faq-cta__panel .btn {
    justify-self: end;
  }
}

@media (min-width: 1100px) {
  .page-faq .qa__a {
    grid-template-columns: minmax(0, 1fr) 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-cats a,
  .page-faq .faq-search,
  .page-faq .qa__q {
    transition: none;
  }

  .page-faq .faq-cats a:hover,
  .page-faq .faq-cats a:focus-visible {
    transform: none;
  }
}