/* ============ 使用教程页 · page-faq ============ */

.page-faq {
  --faq-maxw: 62ch;
}

/* ---------- 章节细点导航 ---------- */
.page-faq .faq-rail {
  display: none;
}

@media (min-width: 1440px) {
  .page-faq .faq-rail {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
    position: fixed;
    top: 148px;
    right: 22px;
    z-index: 30;
  }
}

.page-faq .faq-rail .anchor-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 5px 0;
  text-decoration: none;
  line-height: 1;
}

.page-faq .faq-rail-dot {
  display: block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid rgba(107, 124, 147, 0.72);
  background: transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-faq .faq-rail .anchor-link:hover .faq-rail-dot {
  transform: scale(1.25);
  border-color: var(--teal);
}

.page-faq .faq-rail .anchor-link[aria-current="true"] .faq-rail-dot {
  background: var(--teal);
  border-color: var(--teal);
}

.page-faq .faq-rail-text {
  position: absolute;
  right: 20px;
  white-space: nowrap;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: rgba(244, 241, 234, 0.96);
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  padding: 3px 9px;
  opacity: 0;
  transform: translateX(5px);
  transition: opacity 0.16s ease, transform 0.16s ease;
  pointer-events: none;
}

.page-faq .faq-rail .anchor-link:hover .faq-rail-text,
.page-faq .faq-rail .anchor-link:focus-visible .faq-rail-text {
  opacity: 1;
  transform: none;
}

.page-faq .faq-rail .anchor-link:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--on-dark);
  padding: calc(var(--head-h) + clamp(44px, 8vw, 92px)) 0 clamp(44px, 7vw, 84px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(31, 166, 166, 0.085) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 166, 166, 0.085) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(125% 92% at 78% 10%, #000 0%, transparent 68%);
  mask-image: radial-gradient(125% 92% at 78% 10%, #000 0%, transparent 68%);
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(620px, 72vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(31, 166, 166, 0.2) 0%, rgba(31, 166, 166, 0) 68%);
  pointer-events: none;
}

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

.page-faq .faq-hero .breadcrumb {
  position: relative;
  z-index: 2;
}

.page-faq .faq-hero-copy {
  margin-top: clamp(26px, 5vw, 52px);
  max-width: 64rem;
}

.page-faq .faq-hero .eyebrow {
  color: var(--teal-soft);
}

.page-faq .faq-hero-title {
  margin: 0.6rem 0 0;
  max-width: 820px;
}

.page-faq .faq-hero-lede {
  margin-top: clamp(16px, 3vw, 26px);
  max-width: 56ch;
  color: rgba(232, 237, 243, 0.78);
}

.page-faq .faq-hero-mark {
  display: none;
}

@media (min-width: 1024px) {
  .page-faq .faq-hero-mark {
    display: block;
    position: absolute;
    top: calc(var(--head-h) + 104px);
    right: clamp(14px, 3vw, 42px);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: rgba(126, 217, 217, 0.72);
    z-index: 2;
  }
}

/* ---------- 屏幕步骤区 ---------- */
.page-faq .faq-screens {
  background: var(--paper);
}

.page-faq .faq-screens-head {
  max-width: var(--faq-maxw);
}

.page-faq .faq-tabs {
  display: flex;
  gap: 4px;
  margin-top: clamp(26px, 4.4vw, 46px);
  border-bottom: 1px solid var(--line-light);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-tabs::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-tabs .tab {
  position: relative;
  flex: 0 0 auto;
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
  font-size: 0.875rem;
  line-height: 1.2;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line-light);
  border-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0.95rem 1.1rem 1rem;
  cursor: pointer;
  transition: color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.page-faq .faq-tabs .tab:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.6);
}

.page-faq .faq-tabs .tab[aria-selected="true"] {
  z-index: 1;
  color: var(--ink);
  font-weight: 700;
  background: #fff;
  box-shadow: inset 0 3px 0 0 var(--teal);
}

.page-faq .faq-tabs .tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: #fff;
}

.page-faq .faq-tabs .tab:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.page-faq .faq-panels {
  background: #fff;
  border: 1px solid var(--line-light);
  border-top: 0;
  border-radius: 0 0 var(--radius) var(--radius);
  padding: clamp(22px, 3.6vw, 40px) clamp(18px, 3.2vw, 36px) clamp(26px, 4vw, 44px);
}

.page-faq .faq-panel {
  max-width: var(--faq-maxw);
}

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

.page-faq .faq-panel:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 8px;
}

.page-faq .faq-density {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 0.7rem;
  padding: 0.9rem 1.1rem;
  margin-bottom: clamp(22px, 3.6vw, 34px);
  background: var(--paper);
  border: 1px solid var(--line-light);
  border-left: 3px solid var(--flame);
  border-radius: var(--radius);
}

.page-faq .faq-density-label {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .faq-density-num {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  color: var(--flame);
}

.page-faq .faq-density-unit {
  font-size: 0.8rem;
  color: var(--muted);
}

.page-faq .faq-density-range {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
}

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

.page-faq .faq-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 1rem;
  padding: 1.2rem 0 1.4rem;
  border-bottom: 1px solid var(--line-light);
}

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

.page-faq .faq-step:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-step-no {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 5vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--teal);
}

.page-faq .faq-step-title {
  margin: 0 0 0.42rem;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .faq-step-text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

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

/* ---------- 内容入口区 ---------- */
.page-faq .faq-entrances {
  background: var(--night);
  color: var(--on-dark);
}

.page-faq .faq-entrances .section-title {
  color: #fff;
}

.page-faq .faq-entrances .eyebrow {
  color: var(--teal-soft);
}

.page-faq .faq-entrances .lede {
  color: rgba(232, 237, 243, 0.72);
  max-width: 56ch;
}

.page-faq .faq-entrance-grid {
  margin-top: clamp(26px, 4.4vw, 46px);
  gap: clamp(14px, 2.4vw, 22px);
}

.page-faq .faq-entrance {
  display: flex;
  flex-direction: column;
  gap: 0.72rem;
  padding: clamp(20px, 3vw, 30px);
  background: var(--night-2);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-faq .faq-entrance--wide {
  border-color: rgba(242, 140, 40, 0.48);
}

.page-faq .faq-entrance-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--teal-soft);
  border: 1px solid rgba(126, 217, 217, 0.42);
  border-radius: var(--radius);
  padding: 0.24rem 0.56rem;
}

.page-faq .faq-entrance h3 {
  margin: 0;
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-faq .faq-entrance p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--on-dark);
}

.page-faq .faq-entrance a {
  color: var(--teal-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-entrance a:hover {
  color: #fff;
}

@media (min-width: 768px) {
  .page-faq .faq-entrance--wide {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem 1.6rem;
  }

  .page-faq .faq-entrance--wide h3 {
    flex: 0 0 auto;
  }

  .page-faq .faq-entrance--wide p {
    flex: 1 1 22rem;
  }
}

/* ---------- 术语速查 ---------- */
.page-faq .faq-glossary {
  background: var(--paper);
}

.page-faq .faq-glossary-grid {
  gap: clamp(22px, 4vw, 40px);
}

.page-faq .faq-glossary-aside p {
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-note {
  margin-top: 1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line-light);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-term-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.page-faq .faq-term-table thead th {
  text-align: left;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  font-weight: 600;
  color: var(--muted);
  padding: 0 1rem 0.6rem;
  border-bottom: 1px solid var(--ink);
  white-space: nowrap;
}

.page-faq .faq-term-table td {
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line-light);
  vertical-align: top;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .faq-term-table tbody tr:nth-child(odd) {
  background: var(--data-bg);
}

.page-faq .faq-term-table .faq-term {
  width: 9.5rem;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

/* ---------- 反馈区 ---------- */
.page-faq .faq-feedback {
  background: var(--data-bg);
}

.page-faq .faq-feedback-grid {
  gap: clamp(24px, 4vw, 44px);
}

.page-faq .faq-materials {
  list-style: none;
  margin: clamp(22px, 3.6vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-faq .faq-material {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 1rem;
  padding: 1.05rem 1.15rem;
  background: #fff;
}

.page-faq .faq-material-no {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--teal);
}

.page-faq .faq-material h3 {
  margin: 0 0 0.25rem;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink);
}

.page-faq .faq-material p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-faq .faq-contact {
  margin-top: clamp(22px, 3.4vw, 32px);
  padding: clamp(18px, 2.8vw, 26px);
  background: var(--night);
  border-radius: var(--radius);
  display: grid;
  gap: 0.85rem;
}

.page-faq .faq-contact-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 0.9rem;
}

.page-faq .faq-contact-label {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--teal-soft);
  min-width: 4.5rem;
}

.page-faq .faq-contact-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: #fff;
  word-break: break-all;
}

.page-faq .faq-contact-note {
  font-size: 0.8125rem;
  line-height: 1.72;
  color: var(--on-dark);
  flex: 1 1 16rem;
}

.page-faq .faq-contact-note a {
  color: var(--teal-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-contact-note a:hover {
  color: #fff;
}

.page-faq .faq-contact .copy-btn {
  font-size: 0.8125rem;
  line-height: 1.2;
  padding: 0.36rem 0.75rem;
  color: var(--teal-soft);
  background: transparent;
  border: 1px solid rgba(126, 217, 217, 0.45);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-faq .faq-contact .copy-btn:hover {
  color: #fff;
  border-color: rgba(126, 217, 217, 0.85);
  background: rgba(31, 166, 166, 0.16);
}

.page-faq .faq-contact .copy-btn[data-copied="true"] {
  color: var(--flame);
  border-color: rgba(242, 140, 40, 0.7);
}

.page-faq .faq-contact .copy-btn:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

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

/* ---------- 常见疑问 ---------- */
.page-faq .faq-questions {
  background: var(--paper);
}

.page-faq .faq-questions-head {
  max-width: var(--faq-maxw);
}

.page-faq .faq-accordion {
  margin-top: clamp(24px, 3.6vw, 38px);
  max-width: 78ch;
}

.page-faq .faq-accordion .timeline-item {
  margin-bottom: 0.62rem;
  background: #fff;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-faq .faq-accordion .timeline-item[data-open] {
  border-left: 3px solid var(--teal);
}

.page-faq .faq-accordion .timeline-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  margin: 0;
  text-align: left;
  font: inherit;
  font-size: 0.9688rem;
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
  background: transparent;
  border: 0;
  padding: 1.05rem 1.15rem;
  cursor: pointer;
  transition: color 0.16s ease;
}

.page-faq .faq-accordion .timeline-trigger:hover {
  color: var(--teal);
}

.page-faq .faq-accordion .timeline-trigger:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: -2px;
}

.page-faq .faq-accordion .timeline-caret {
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: -4px;
  border-right: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: rotate(45deg);
  transition: transform 0.2s ease, margin-top 0.2s ease;
}

.page-faq .faq-accordion .timeline-item[data-open] .timeline-caret {
  margin-top: 4px;
  transform: rotate(-135deg);
}

.page-faq .faq-accordion .timeline-body {
  padding: 0 1.15rem 1.15rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-faq .faq-accordion .timeline-body p {
  margin: 0;
}

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 640px) {
  .page-faq .faq-hero-lede,
  .page-faq .faq-entrances .lede {
    max-width: none;
  }

  .page-faq .faq-panels {
    border-left: 0;
    border-right: 0;
    padding-left: 0;
    padding-right: 0;
  }

  .page-faq .faq-density-range {
    margin-left: 0;
    flex: 1 1 100%;
  }

  .page-faq .faq-term-table .faq-term {
    width: auto;
    white-space: normal;
  }

  .page-faq .faq-step {
    gap: 0.3rem 0.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-rail-dot,
  .page-faq .faq-rail-text,
  .page-faq .faq-tabs .tab,
  .page-faq .faq-accordion .timeline-caret,
  .page-faq .faq-contact .copy-btn {
    transition: none;
  }
}