.page-faq {
  --faq-axis-w: 220px;
  --faq-bd: 3px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

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

.page-faq .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-faq .kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--sand);
  margin: 0 0 16px;
}

/* ---------- hero ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--paper);
  padding: clamp(20px, 3vw, 32px) 0 clamp(48px, 7vw, 88px);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -22%;
  width: 54%;
  height: 82%;
  background: var(--sand);
  opacity: .14;
  transform: skewY(-11deg);
  pointer-events: none;
}

.page-faq .faq-trail {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--line);
  margin: 0 0 clamp(26px, 5vw, 52px);
}

.page-faq .faq-trail a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

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

.page-faq .faq-trail__sep {
  color: var(--sand);
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
}

.page-faq .faq-hero .kicker {
  color: var(--amber);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6.6vw, 70px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0 0 clamp(16px, 2.5vw, 24px);
  max-width: 15em;
}

.page-faq .faq-hero__text {
  font-size: 16px;
  line-height: 1.75;
  color: var(--line);
  margin: 0 0 28px;
  max-width: 42em;
}

.page-faq .faq-jump {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-faq .faq-jump a {
  display: inline-block;
  padding: 9px 16px;
  border: 2px solid var(--line);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.page-faq .faq-jump a:hover,
.page-faq .faq-jump a:focus-visible {
  background: var(--sand);
  border-color: var(--sand);
  color: var(--night-deep);
}

.page-faq .faq-hero__meter {
  border: var(--faq-bd) solid var(--line);
  background: var(--night-deep);
  padding: clamp(20px, 3vw, 28px);
  box-shadow: var(--shadow-sand);
}

.page-faq .faq-hero__meter-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
  margin: 0 0 18px;
}

.page-faq .faq-meter {
  display: flex;
  gap: 4px;
  height: 20px;
  margin: 0 0 20px;
}

.page-faq .faq-meter__seg {
  display: block;
  flex: 1 1 0;
}

.page-faq .faq-meter__seg--a { background: var(--sand); }
.page-faq .faq-meter__seg--b { background: var(--mint); }
.page-faq .faq-meter__seg--c { background: var(--amber); }

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

.page-faq .faq-meter__legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--paper);
}

.page-faq .faq-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
}

.page-faq .faq-dot--a { background: var(--sand); }
.page-faq .faq-dot--b { background: var(--mint); }
.page-faq .faq-dot--c { background: var(--amber); }

/* ---------- 上手清单 ---------- */

.page-faq .faq-kit {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-faq .faq-kit__head {
  max-width: 60em;
  margin: 0 0 clamp(28px, 4vw, 46px);
}

.page-faq .faq-kit h2,
.page-faq .faq-hub h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.2vw, 46px);
  line-height: 1.08;
  letter-spacing: -.005em;
  margin: 0 0 16px;
}

.page-faq .faq-kit__lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-faq .kit-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-bd);
  background: var(--ink);
  border: var(--faq-bd) solid var(--ink);
}

.page-faq .kit-col {
  background: var(--paper);
  padding: clamp(20px, 2.4vw, 28px);
}

.page-faq .kit-col__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: var(--faq-bd) solid var(--ink);
}

.page-faq .kit-col__title .num {
  color: var(--sand);
  font-size: 20px;
  letter-spacing: .06em;
}

.page-faq .kit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .kit-list li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 8px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink);
}

.page-faq .kit-list__n {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  padding-top: 4px;
  letter-spacing: .04em;
}

.page-faq .faq-kit__figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
}

/* ---------- 问答区 ---------- */

.page-faq .faq-hub {
  background: var(--night-deep);
  color: var(--paper);
  padding: clamp(44px, 7vw, 88px) 0 clamp(56px, 8vw, 96px);
}

.page-faq .faq-hub__head {
  max-width: 60em;
  margin: 0 0 clamp(28px, 4vw, 46px);
}

.page-faq .faq-hub .kicker {
  color: var(--amber);
}

.page-faq .faq-hub h2 {
  color: var(--paper);
}

.page-faq .faq-hub__lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--line);
  margin: 0;
}

.page-faq .faq-seg {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 44px);
}

.page-faq .faq-axis {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-faq .faq-axis__btn {
  flex: 0 0 auto;
  white-space: nowrap;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 16px;
  background: transparent;
  border: var(--faq-bd) solid var(--line);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-align: left;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.page-faq .faq-axis__btn .num {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--line);
}

.page-faq .faq-axis__btn:hover {
  border-color: var(--sand);
}

.page-faq .faq-axis__btn:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: 2px;
}

.page-faq .faq-axis__btn[aria-selected="true"] {
  background: var(--sand);
  border-color: var(--sand);
  color: var(--night-deep);
}

.page-faq .faq-axis__btn[aria-selected="true"] .num {
  color: var(--night-deep);
}

.page-faq .faq-panels {
  min-width: 0;
}

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

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

.page-faq .faq-panel__figure {
  margin: 0;
}

.page-faq .faq-panel__list {
  display: grid;
  gap: 12px;
}

.page-faq .faq-item {
  border: var(--faq-bd) solid var(--line);
  background: var(--night);
  transition: border-color var(--t-fast);
}

.page-faq .faq-item[open] {
  border-color: var(--sand);
  box-shadow: inset 6px 0 0 var(--sand);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  list-style: none;
}

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

.page-faq .faq-item summary::marker {
  content: "";
}

.page-faq .faq-item summary::before {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1.3;
  color: var(--sand);
}

.page-faq .faq-item[open] summary::before {
  content: "–";
}

.page-faq .faq-item summary:focus-visible {
  outline: 3px solid var(--mint);
  outline-offset: -3px;
}

.page-faq .faq-item__body {
  padding: 0 20px 20px 52px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--line);
}

.page-faq .faq-item__body p {
  margin: 0;
}

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

.page-faq .faq-item__body a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 排查流程图 ---------- */

.page-faq .faq-flow {
  margin: 0;
  border: var(--faq-bd) solid var(--line);
  background: var(--night);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-faq .faq-flow__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 420px;
  margin: 0 auto;
}

.page-faq .faq-flow__svg rect {
  fill: var(--night-deep);
  stroke: var(--line);
  stroke-width: 3;
}

.page-faq .faq-flow__svg text {
  fill: var(--paper);
  font-family: var(--font-mono);
  font-size: 15px;
}

.page-faq .faq-flow__svg path {
  fill: none;
  stroke: var(--mint);
  stroke-width: 3;
  stroke-linejoin: miter;
}

.page-faq .faq-flow figcaption {
  margin-top: 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--line);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-faq .faq-meter__legend {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 820px) {
  .page-faq .kit-cols {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-faq .faq-hero__meter {
    margin-top: clamp(8px, 2vw, 22px);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-seg {
    grid-template-columns: var(--faq-axis-w) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-faq .faq-axis {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-axis__btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-trail a,
  .page-faq .faq-jump a,
  .page-faq .faq-axis__btn,
  .page-faq .faq-item {
    transition: none;
  }
}