.page-faq {
  --faq-cut: 14px;
  --faq-hair: rgba(28, 26, 22, .16);
  --faq-hair-dark: rgba(245, 238, 226, .18);
  background: var(--sand-050);
  color: var(--ink-900);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4.2vw, 54px) 0 clamp(26px, 4vw, 46px);
  background: linear-gradient(178deg, var(--sand-100) 0%, var(--sand-050) 76%);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: 58%;
  height: 172%;
  background: repeating-linear-gradient(112deg, transparent 0 24px, rgba(176, 115, 39, .14) 24px 25px);
  transform: skewX(-9deg);
  pointer-events: none;
}

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

.page-faq .faq-hero__tag {
  margin: clamp(18px, 3vw, 30px) 0 10px;
  color: var(--clay-700);
}

.page-faq .faq-hero .display {
  margin: 0;
  max-width: 14ch;
  letter-spacing: -.03em;
  line-height: 1.02;
}

.page-faq .faq-hero__sub {
  margin: 12px 0 0;
  max-width: 30ch;
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--clay-700);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-900);
}

.page-faq .faq-hero__lead--dim {
  margin-top: 12px;
  color: var(--clay-700);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 760px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  background: var(--faq-hair);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-fact {
  background: var(--sand-050);
  padding: 12px 16px 14px;
}

.page-faq .faq-fact dt {
  margin: 0;
  color: var(--ash-500);
}

.page-faq .faq-fact dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.1;
  color: var(--ink-900);
}

/* ---------- 主体两栏 ---------- */

.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  padding-top: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-faq .faq-main {
  display: grid;
  gap: clamp(38px, 5vw, 68px);
  min-width: 0;
}

/* ---------- 目录 ---------- */

.page-faq .faq-toc__inner {
  padding: 16px 18px 16px;
  background: var(--sand-100);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-toc__title {
  margin: 0;
  color: var(--clay-700);
}

.page-faq .faq-toc__gt {
  margin: 14px 0 4px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink-900);
}

.page-faq .faq-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 14px;
}

.page-faq .faq-toc__list a {
  display: block;
  padding: 4px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ash-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .faq-toc__list a:hover,
.page-faq .faq-toc__list a:focus-visible {
  color: var(--ember-700);
  border-bottom-color: var(--ember-700);
}

.page-faq .faq-toc__backline {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-toc__back {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--clay-700);
  text-decoration: none;
  border-bottom: 1px solid var(--ochre-500);
}

.page-faq .faq-toc__back:hover,
.page-faq .faq-toc__back:focus-visible {
  color: var(--ember-700);
  border-bottom-color: var(--ember-600);
}

/* ---------- 分组标题 ---------- */

.page-faq .faq-group__head {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  padding-left: 16px;
  border-left: 3px solid var(--ochre-500);
}

.page-faq .faq-group__kicker {
  margin: 0 0 8px;
  color: var(--ash-500);
}

.page-faq .faq-group__head .section-title {
  margin: 0;
}

.page-faq .faq-group__intro {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--clay-700);
}

/* ---------- 问答说明牌 ---------- */

.page-faq .faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.6vw, 18px);
}

.page-faq .faq-item {
  position: relative;
  padding: 1px;
  background: var(--clay-700);
  clip-path: polygon(
    var(--faq-cut) 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%,
    0 var(--faq-cut)
  );
  transition: background-color .18s ease;
}

.page-faq .faq-item:hover {
  background: var(--ember-600);
}

.page-faq .faq-item > details {
  background: var(--sand-050);
  clip-path: polygon(
    var(--faq-cut) 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%,
    0 var(--faq-cut)
  );
}

.page-faq .faq-item__q {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0;
  padding: clamp(15px, 2vw, 22px) clamp(16px, 2.4vw, 26px);
  font-size: clamp(16px, 1.35vw, 19px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__num {
  flex: 0 0 auto;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ember-700);
}

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

.page-faq .faq-item__q::after {
  content: "+";
  flex: 0 0 auto;
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--ash-500);
  transition: color .18s ease;
}

.page-faq .faq-item details[open] .faq-item__q::after {
  content: "—";
  color: var(--ember-600);
}

.page-faq .faq-item__a {
  padding: clamp(14px, 1.8vw, 18px) clamp(16px, 2.4vw, 26px) clamp(16px, 2.2vw, 24px);
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-item__a p {
  margin: 0;
  max-width: 66ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-900);
}

.page-faq .faq-item__a p + p {
  margin-top: .95em;
}

/* ---------- 口径公式行 ---------- */

.page-faq .faq-item__a p.faq-formula,
.page-faq .faq-formula {
  margin-top: 14px;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.7;
  color: var(--sand-050);
  background: var(--pitch-900);
  border-left: 3px solid var(--ember-600);
  overflow-wrap: anywhere;
}

.page-faq .faq-formula .faq-var {
  color: var(--cyan-400);
}

/* ---------- 图 ---------- */

.page-faq .faq-figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

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

.page-faq .faq-figure .figure__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash-500);
}

/* ---------- 收束面板 ---------- */

.page-faq .faq-cta {
  position: relative;
  margin-top: clamp(8px, 2vw, 18px);
  padding: clamp(24px, 3.4vw, 40px);
  color: var(--sand-050);
  background: var(--pitch-900);
  clip-path: polygon(
    var(--faq-cut) 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%,
    0 var(--faq-cut)
  );
}

.page-faq .faq-cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--ochre-500) 0%, var(--ember-600) 46%, var(--cyan-400) 100%);
}

.page-faq .faq-cta__tag {
  margin: 0 0 10px;
  color: var(--ochre-500);
}

.page-faq .faq-cta__title {
  margin: 0;
  color: var(--white);
}

.page-faq .faq-cta__text {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--sand-100);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-faq .faq-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-faq .faq-body {
    grid-template-columns: minmax(0, 1fr) 264px;
    gap: clamp(30px, 4vw, 58px);
    align-items: start;
  }

  .page-faq .faq-main {
    grid-column: 1;
    grid-row: 1;
  }

  .page-faq .faq-toc {
    grid-column: 2;
    grid-row: 1;
    align-self: stretch;
  }

  .page-faq .faq-toc__inner {
    position: sticky;
    top: 96px;
    padding: 4px 0 4px 20px;
    background: transparent;
    border: 0;
    border-left: 1px solid var(--faq-hair);
  }

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

  .page-faq .faq-toc__backline {
    margin-top: 22px;
  }
}

@media (max-width: 560px) {
  .page-faq .faq-item__q {
    gap: 10px;
    align-items: flex-start;
  }

  .page-faq .faq-item__num {
    padding-top: 4px;
  }

  .page-faq .faq-item__a p {
    font-size: 16px;
  }

  .page-faq .faq-item__a p.faq-formula,
  .page-faq .faq-formula {
    font-size: 12px;
    padding: 9px 12px;
  }

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

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

/* ---------- 打印：单栏黑白问答 ---------- */

@media print {
  .page-faq {
    background: #fff;
    color: #000;
  }

  .page-faq .faq-hero {
    background: #fff;
    border-bottom: 1px solid #000;
    padding: 0 0 12px;
  }

  .page-faq .faq-hero::after,
  .page-faq .faq-toc,
  .page-faq .faq-cta::before {
    display: none;
  }

  .page-faq .faq-body {
    display: block;
    padding: 12px 0 0;
  }

  .page-faq .faq-item,
  .page-faq .faq-item > details,
  .page-faq .faq-cta {
    background: #fff;
    color: #000;
    clip-path: none;
    border: 1px solid #000;
    padding: 0;
  }

  .page-faq .faq-item {
    margin-bottom: 12px;
    break-inside: avoid;
  }

  .page-faq .faq-formula {
    background: #fff;
    color: #000;
    border-left: 2px solid #000;
  }

  .page-faq .faq-formula .faq-var,
  .page-faq .faq-item__num {
    color: #000;
  }

  .page-faq .faq-cta__title,
  .page-faq .faq-cta__text,
  .page-faq .faq-cta__tag {
    color: #000;
  }
}