.page-faq {
  --faq-rule: rgba(16, 22, 19, .16);
  --faq-rule-soft: rgba(16, 22, 19, .08);
  --faq-glow: rgba(217, 164, 65, .16);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-faq .faq-hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(28px, 4vw, 48px);
}

.page-faq .hero-frame {
  position: relative;
  margin-top: clamp(16px, 2.4vw, 28px);
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(194, 24, 43, .10), transparent 58%),
    linear-gradient(180deg, var(--faq-glow), rgba(246, 241, 231, 0) 42%),
    var(--paper);
  padding: clamp(20px, 3vw, 40px);
}

.page-faq .hero-frame::before,
.page-faq .hero-frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--c-gold) 0 1px, transparent 1px 15px);
  opacity: .7;
  pointer-events: none;
}

.page-faq .hero-frame::before { top: -1px; }
.page-faq .hero-frame::after { bottom: -1px; }

.page-faq .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
}

.page-faq .hero-copy h1 {
  margin: 10px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(29px, 6vw, 52px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--c-ink);
}

.page-faq .hero-lead {
  margin: 16px 0 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-faq .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-faq .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 26px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--faq-rule-soft);
}

.page-faq .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-faq .fact-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-red);
}

.page-faq .fact-key {
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--ink-mute);
}

.page-faq .hero-window {
  margin: 0;
  border: 2px solid var(--c-ink);
  background: var(--c-night);
  box-shadow: var(--shadow-paper);
  overflow: hidden;
}

.page-faq .window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  background: var(--c-moss);
  border-bottom: 1px solid rgba(217, 164, 65, .45);
}

.page-faq .window-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-gold);
  opacity: .8;
}

.page-faq .window-dot:nth-child(2) { background: var(--c-cyan); }
.page-faq .window-dot:nth-child(3) { background: var(--c-grass); }

.page-faq .window-url {
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(246, 241, 231, .78);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-faq .hero-window img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  max-width: 100%;
}

.page-faq .faq-toc {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
  padding: 10px 0;
  border-top: 1px solid var(--faq-rule);
  border-bottom: 1px solid var(--faq-rule);
}

.page-faq .toc-label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-red);
}

.page-faq .toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 2px 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .toc-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--faq-rule);
  background: var(--paper-2);
  color: var(--ink);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: background .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.page-faq .toc-list a:hover,
.page-faq .toc-list a:focus-visible {
  background: var(--c-red);
  border-color: var(--c-red);
  color: #fff;
  transform: translateY(-1px);
}

.page-faq .toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: .72;
}

.page-faq .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-faq .sec-head h2 {
  margin: 8px 0 0;
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -.015em;
}

.page-faq .sec-lead {
  margin: 14px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 三步开始 */
.page-faq .steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 4px;
  counter-reset: step;
}

.page-faq .step {
  position: relative;
  padding: 4px 0 30px 58px;
}

.page-faq .step::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 44px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-red), rgba(194, 24, 43, .12));
}

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

.page-faq .step-num {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--c-red);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  box-shadow: 0 0 0 4px rgba(194, 24, 43, .12);
}

.page-faq .step h3 {
  margin: 6px 0 0;
  font-size: clamp(18px, 2.2vw, 21px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-faq .step p {
  margin: 8px 0 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-faq .start-note {
  margin-top: 8px;
  padding: 20px 22px;
  border-left: 4px solid var(--c-gold);
  background: var(--paper-2);
  box-shadow: var(--shadow-paper);
}

.page-faq .note-title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-gold-deep);
}

.page-faq .start-note p:last-child {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 适配 */
.page-faq .faq-adapt {
  background:
    linear-gradient(180deg, rgba(237, 228, 210, .9), rgba(246, 241, 231, .2)),
    var(--paper);
  border-top: 1px solid var(--faq-rule-soft);
  border-bottom: 1px solid var(--faq-rule-soft);
}

.page-faq .adapt-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-faq .adapt-card {
  padding: clamp(20px, 2.6vw, 30px);
}

.page-faq .card-title {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--faq-rule);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-faq .spec-list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-faq .spec-row {
  display: grid;
  gap: 3px;
}

.page-faq .spec-row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-red);
}

.page-faq .spec-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-faq .adapt-card--fix {
  background: var(--c-moss);
  color: var(--paper);
  border: 1px solid rgba(217, 164, 65, .35);
}

.page-faq .adapt-card--fix .card-title {
  color: var(--paper);
  border-bottom-color: rgba(246, 241, 231, .22);
}

.page-faq .fix-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-faq .fix-list li {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
}

.page-faq .fix-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--c-cyan);
  padding-top: 2px;
}

.page-faq .fix-list h4 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .fix-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(246, 241, 231, .8);
}

/* 同步 */
.page-faq .sync-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 44px);
  align-items: center;
}

.page-faq .sync-copy h2 {
  margin: 8px 0 0;
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.26;
  letter-spacing: -.015em;
}

.page-faq .sync-copy > p {
  margin: 14px 0 0;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-faq .sync-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-faq .sync-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  border-left: 3px solid var(--c-grass);
  background: rgba(46, 125, 79, .09);
}

.page-faq .sync-device {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-grass);
}

.page-faq .sync-use {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink);
}

.page-faq .sync-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-gold);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-mute);
}

.page-faq .sync-figure {
  margin: 0;
}

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

/* 问答 */
.page-faq .qa-root {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 34px);
}

.page-faq .qa-side {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .qa-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-faq .qa-filters .filter-btn {
  padding: 8px 14px;
  border: 1px solid var(--faq-rule);
  background: var(--paper-2);
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-faq .qa-filters .filter-btn:hover,
.page-faq .qa-filters .filter-btn:focus-visible {
  border-color: var(--c-red);
  color: var(--c-red);
  outline: none;
}

.page-faq .qa-filters .filter-btn[aria-pressed="true"] {
  background: var(--c-red);
  border-color: var(--c-red);
  color: #fff;
}

.page-faq .qa-side-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

.page-faq .qa-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--faq-rule);
}

.page-faq .qa-item {
  border-bottom: 1px solid var(--faq-rule-soft);
  transition: background .18s var(--ease);
}

.page-faq .qa-item[open] {
  background: rgba(217, 164, 65, .09);
  box-shadow: inset 3px 0 0 var(--c-red);
}

.page-faq .qa-item[hidden] { display: none; }

.page-faq .qa-item summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 40px 16px 16px;
  position: relative;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
}

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

.page-faq .qa-item summary::after {
  content: "+";
  position: absolute;
  right: 14px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-red);
}

.page-faq .qa-item[open] summary::after {
  content: "−";
  color: var(--c-gold-deep);
}

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

.page-faq .qa-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--c-gold-deep);
  padding-top: 3px;
}

.page-faq .qa-a {
  padding: 0 40px 18px 39px;
}

.page-faq .qa-a p {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-faq .qa-empty {
  margin: 20px 0 0;
  padding: 16px;
  border: 1px dashed var(--faq-rule);
  font-size: 14px;
  color: var(--ink-mute);
}

.page-faq .qa-empty[hidden] { display: none; }

/* 更新节奏 */
.page-faq .update-panel {
  padding: clamp(24px, 3.2vw, 44px);
  background:
    radial-gradient(90% 120% at 0% 0%, rgba(25, 224, 200, .12), transparent 55%),
    var(--c-moss);
  border: 1px solid rgba(217, 164, 65, .32);
}

.page-faq .update-panel .eyebrow { color: var(--c-cyan); }

.page-faq .update-head h2 {
  margin: 8px 0 0;
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.26;
  color: var(--paper);
}

.page-faq .update-head p {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246, 241, 231, .78);
}

.page-faq .update-track {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-faq .update-step {
  padding: 18px 18px 20px;
  background: rgba(11, 27, 43, .55);
  border-top: 2px solid var(--c-gold);
}

.page-faq .update-time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--c-gold);
}

.page-faq .update-time small {
  margin-left: 4px;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .06em;
  color: rgba(246, 241, 231, .7);
}

.page-faq .update-step h3 {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-faq .update-step p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 241, 231, .76);
}

.page-faq .update-foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(246, 241, 231, .2);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-cyan);
}

/* 人工协助 */
.page-faq .faq-help {
  padding: clamp(32px, 4vw, 56px) 0 clamp(40px, 5vw, 64px);
}

.page-faq .help-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(24px, 3.4vw, 44px);
  background:
    repeating-linear-gradient(135deg, rgba(217, 164, 65, .14) 0 10px, transparent 10px 24px),
    var(--c-red);
  color: var(--paper);
  border-bottom: 4px solid var(--c-gold);
}

.page-faq .help-band .eyebrow { color: rgba(246, 241, 231, .85); }

.page-faq .help-copy h2 {
  margin: 8px 0 0;
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 900;
  line-height: 1.26;
  letter-spacing: -.015em;
  color: #fff;
}

.page-faq .help-copy p {
  margin: 14px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246, 241, 231, .88);
}

.page-faq .help-copy .btn-ghost {
  margin-top: 22px;
  border-color: rgba(246, 241, 231, .7);
  color: #fff;
}

.page-faq .help-copy .btn-ghost:hover,
.page-faq .help-copy .btn-ghost:focus-visible {
  background: var(--paper);
  color: var(--c-red);
  border-color: var(--paper);
}

.page-faq .help-contact {
  padding: 20px 22px;
  background: rgba(11, 22, 19, .42);
  border: 1px solid rgba(217, 164, 65, .5);
}

.page-faq .help-contact .contact-list {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-faq .help-contact .contact-row {
  display: grid;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(246, 241, 231, .16);
}

.page-faq .help-contact .contact-row:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-faq .help-contact .contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-faq .help-contact .contact-val {
  font-size: 15px;
  line-height: 1.6;
  word-break: break-word;
  color: var(--paper);
}

.page-faq .help-contact .contact-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(246, 241, 231, .72);
}

.page-faq .help-legal {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-mute);
}

.page-faq .help-legal a {
  color: var(--c-red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 720px) {
  .page-faq .adapt-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-faq .update-track {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .hero-facts li + li {
    padding-left: 26px;
    border-left: 1px solid var(--faq-rule-soft);
  }
}

@media (min-width: 900px) {
  .page-faq .hero-grid {
    grid-template-columns: 1.1fr .9fr;
    align-items: center;
  }

  .page-faq .sync-grid {
    grid-template-columns: .92fr 1.08fr;
  }

  .page-faq .qa-root {
    grid-template-columns: 250px 1fr;
    align-items: start;
  }

  .page-faq .qa-side {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-faq .qa-filters {
    flex-direction: column;
    align-items: stretch;
  }

  .page-faq .qa-filters .filter-btn {
    text-align: left;
  }

  .page-faq .help-band {
    grid-template-columns: 1.05fr .95fr;
    align-items: center;
  }

  .page-faq .steps {
    max-width: 760px;
  }
}

@media (max-width: 420px) {
  .page-faq .step {
    padding-left: 48px;
  }

  .page-faq .step-num {
    width: 34px;
    height: 34px;
    font-size: 12px;
  }

  .page-faq .step::before {
    left: 16px;
  }

  .page-faq .qa-item summary {
    padding-right: 30px;
  }

  .page-faq .qa-a {
    padding: 0 20px 16px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .toc-list a,
  .page-faq .qa-item,
  .page-faq .qa-filters .filter-btn {
    transition: none;
  }
}