.page-faq {
  --faq-panel: #12151C;
  --faq-body-text: #C6CEDD;
  --faq-index-w: 236px;
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: 22px 0 36px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(900px 380px at 6% -30%, rgba(255, 106, 43, 0.18), transparent 62%),
    radial-gradient(760px 340px at 96% 4%, rgba(53, 198, 232, 0.15), transparent 66%),
    var(--ink);
}

.page-faq .faq-hero__inner {
  display: grid;
  gap: 16px;
}

.page-faq .faq-title {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 8vw, 82px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.page-faq .faq-title__accent {
  color: var(--orange);
  box-shadow: inset 0 -0.18em 0 rgba(255, 106, 43, 0.22);
}

.page-faq .faq-lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--faq-body-text);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 0;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-faq .faq-hero__facts li {
  flex: 1 1 190px;
  min-width: 0;
  padding: 14px 16px 12px 0;
  border-right: 1px solid var(--line);
}

.page-faq .faq-hero__facts li:last-child {
  border-right: 0;
}

.page-faq .faq-hero__facts strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: -0.01em;
}

.page-faq .faq-hero__facts span {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--steel);
  letter-spacing: 0.02em;
}

/* ---------- 两栏骨架 ---------- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-top: 20px;
  padding-bottom: 72px;
}

/* ---------- 左侧索引 ---------- */
.page-faq .faq-index {
  padding: 4px 0 20px;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .faq-index__nav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.page-faq .faq-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--steel);
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(18, 21, 28, 0.7);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-index__link .mono {
  font-size: 11px;
  color: var(--steel);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--line-strong);
}

.page-faq .faq-index__link[aria-current="true"] {
  color: var(--ink);
  background: var(--orange);
  border-color: var(--orange);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(53, 224, 176, 0.55);
}

.page-faq .faq-index__link[aria-current="true"] .mono {
  color: rgba(11, 18, 48, 0.72);
}

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

.page-faq .faq-section {
  padding: 26px 0 44px;
  border-top: 1px solid var(--line);
}

.page-faq .faq-section:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-faq .faq-section__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding-bottom: 22px;
}

.page-faq .faq-section__num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-faq .faq-section__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 34px);
  letter-spacing: -0.01em;
  line-height: 1.12;
  color: var(--paper);
}

.page-faq .faq-section__sub {
  flex: 1 1 100%;
  margin: 0;
  font-size: 13px;
  color: var(--steel);
  letter-spacing: 0.01em;
}

/* ---------- 快速上手 ---------- */
.page-faq .faq-start {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

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

.page-faq .steps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--line);
}

.page-faq .steps__item:first-child {
  padding-top: 0;
}

.page-faq .steps__num {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--orange);
  color: var(--ink);
  font-weight: 700;
  font-size: 16px;
  box-shadow: 4px 4px 0 var(--teal);
}

.page-faq .steps__body h3 {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-faq .steps__body h3 a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 198, 232, 0.42);
}

.page-faq .steps__body h3 a:hover,
.page-faq .steps__body h3 a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-faq .steps__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--faq-body-text);
}

.page-faq .faq-figure {
  margin: 0;
  border: 2px solid var(--line-strong);
  box-shadow: 6px 6px 0 var(--orange);
}

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

/* ---------- 问答 ---------- */
.page-faq .qa {
  display: grid;
  gap: 20px;
}

.page-faq .qa__item {
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--line);
  transition: border-color 0.24s ease, background 0.24s ease;
}

.page-faq .qa__item:hover {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(53, 198, 232, 0.07), transparent 72%);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-faq .qa__q .mono {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-faq .qa__a {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--faq-body-text);
}

.page-faq .qa__a a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 176, 0.4);
}

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

/* ---------- 联系与纠错 ---------- */
.page-faq .contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-faq .contact-cell {
  padding: 18px 16px;
  background: var(--faq-panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
}

.page-faq .contact-cell__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-faq .contact-cell__value {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  word-break: break-word;
  color: var(--paper);
}

.page-faq .contact-cell__value--sm {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
}

.page-faq .contact-cell__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

.page-faq .fix-block {
  margin-top: 22px;
  padding: 22px 18px 24px;
  border: 2px solid var(--line-strong);
  background: linear-gradient(140deg, rgba(255, 106, 43, 0.12), rgba(18, 21, 28, 0.9) 58%);
}

.page-faq .fix-block__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 3.6vw, 24px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .fix-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.page-faq .fix-list__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-size: 14.5px;
  color: var(--paper);
  background: rgba(11, 18, 48, 0.62);
  border: 1px solid var(--line);
}

.page-faq .fix-list__item .mono {
  font-size: 11px;
  color: var(--amber);
}

.page-faq .fix-block__note {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--faq-body-text);
}

/* ---------- 术语表 ---------- */
.page-faq .glossary {
  position: relative;
  overflow: hidden;
  padding: 22px 16px 10px;
  border: 2px solid var(--line-strong);
  background: var(--faq-panel);
}

.page-faq .glossary__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  z-index: 0;
  pointer-events: none;
}

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

.page-faq .glossary__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
}

.page-faq .glossary__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.page-faq .glossary__item:first-child {
  border-top: 0;
}

.page-faq .glossary__term {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  line-height: 1.5;
}

.page-faq .glossary__no {
  display: inline-block;
  margin-right: 6px;
  font-size: 11px;
  color: var(--mint);
}

.page-faq .glossary__def {
  grid-column: 2;
  margin: 3px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

.page-faq .glossary__item {
  grid-template-areas: "no term" ". def";
}

.page-faq .glossary__term {
  grid-area: term;
}

.page-faq .glossary__no {
  grid-area: no;
}

.page-faq .glossary__def {
  grid-area: def;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-hero {
    padding: 30px 0 44px;
  }

  .page-faq .faq-hero__inner {
    gap: 20px;
  }

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

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

  .page-faq .glossary {
    padding: 26px 24px 12px;
  }

  .page-faq .glossary__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-faq .glossary__item:nth-child(2) {
    border-top: 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: 48px;
    padding-top: 34px;
    padding-bottom: 96px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    align-self: start;
    padding: 0;
    border-bottom: 0;
  }

  .page-faq .faq-index__nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-faq .faq-index__link {
    display: flex;
    width: 100%;
    padding: 10px 12px 10px 14px;
    border: 0;
    border-left: 2px solid var(--line);
    background: transparent;
    white-space: normal;
  }

  .page-faq .faq-index__link:hover,
  .page-faq .faq-index__link:focus-visible {
    background: rgba(238, 242, 248, 0.05);
  }

  .page-faq .faq-index__link[aria-current="true"] {
    color: var(--paper);
    background: rgba(255, 106, 43, 0.16);
    border-left-color: var(--orange);
    transform: none;
    box-shadow: none;
  }

  .page-faq .faq-index__link[aria-current="true"] .mono {
    color: var(--orange);
  }

  .page-faq .faq-section {
    padding: 30px 0 56px;
  }

  .page-faq .faq-section:first-child {
    padding-top: 20px;
  }

  .page-faq .faq-start {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 38px;
    align-items: start;
  }

  .page-faq .faq-figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-faq .qa__q {
    font-size: 17.5px;
  }

  .page-faq .qa__a {
    font-size: 15.5px;
  }

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

  .page-faq .fix-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-faq .fix-list__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    font-size: 13.5px;
    line-height: 1.5;
  }

  .page-faq .glossary {
    padding: 30px 30px 14px;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-index {
    --faq-index-w: 252px;
  }

  .page-faq .faq-index__link {
    font-size: 14.5px;
  }
}

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

  .page-faq .faq-index__link[aria-current="true"] {
    transform: none;
  }
}
</main>