.page-faq {
  --faq-line: rgba(6, 23, 38, 0.1);
  --faq-line-strong: rgba(6, 23, 38, 0.2);
  --faq-wash: rgba(20, 59, 94, 0.06);
  --faq-sand-wash: rgba(224, 177, 94, 0.1);

  background: var(--paper-50);
  color: var(--ink-900);
  font-family: var(--font-sans);
  line-height: 1.85;
  overflow-x: hidden;
}

.page-faq h1,
.page-faq h2,
.page-faq h3 {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--sand-500);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */

.page-faq .tut-hero {
  position: relative;
  overflow: hidden;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  padding: clamp(24px, 5vw, 46px) 0 clamp(36px, 7vw, 76px);
  background:
    radial-gradient(90% 70% at 92% -10%, rgba(224, 177, 94, 0.2), transparent 62%),
    radial-gradient(70% 60% at 4% 110%, rgba(47, 191, 159, 0.13), transparent 60%),
    linear-gradient(170deg, var(--ink-900) 0%, var(--ink-700) 100%);
  color: var(--mist-200);
}

.page-faq .tut-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(200, 214, 228, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 214, 228, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
}

.page-faq .tut-hero > .container {
  position: relative;
  z-index: 1;
}

.page-faq .tut-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 4vw, 34px);
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: var(--slate-500);
}

.page-faq .tut-crumb a {
  color: var(--sand-200);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease-out);
}

.page-faq .tut-crumb a:hover {
  border-bottom-color: var(--sand-500);
}

.page-faq .tut-crumb__now {
  color: var(--slate-500);
}

.page-faq .tut-hero__eyebrow {
  margin: 0 0 14px;
  font-size: var(--step-12);
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--sand-500);
}

.page-faq .tut-hero__title {
  max-width: 18ch;
  margin-bottom: clamp(16px, 3vw, 26px);
  font-size: clamp(30px, 6vw, 58px);
  line-height: 1.12;
  color: var(--paper-50);
}

.page-faq .tut-hero__lede {
  max-width: 66ch;
  margin: 0 0 clamp(22px, 4vw, 34px);
  font-size: var(--step-17);
  line-height: 1.85;
  color: var(--mist-200);
}

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

.page-faq .tut-hero__chips li {
  padding: 8px 15px;
  border: 1px solid rgba(224, 177, 94, 0.35);
  border-radius: var(--radius-pill);
  background: rgba(224, 177, 94, 0.07);
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.04em;
  color: var(--sand-200);
}

/* ---------- 主体骨架 ---------- */

.page-faq .tut-body {
  display: grid;
  gap: clamp(28px, 5vw, 44px);
  padding-top: clamp(32px, 6vw, 64px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .tut-main {
  min-width: 0;
}

.page-faq .tut-chapter {
  scroll-margin-top: 96px;
  padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--faq-line);
}

.page-faq .tut-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .tut-chapter + .tut-chapter {
  margin-top: clamp(36px, 6vw, 62px);
}

.page-faq .tut-chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.6vw, 26px);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-faq .tut-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(38px, 6vw, 68px);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--cabin-500);
  opacity: 0.5;
}

.page-faq .tut-chapter__meta {
  min-width: 0;
}

.page-faq .tut-chapter__title {
  font-size: clamp(21px, 3.2vw, 32px);
  color: var(--ink-900);
}

.page-faq .tut-chapter__kicker {
  max-width: 56ch;
  margin: 8px 0 0;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--slate-500);
}

.page-faq .tut-lead {
  max-width: 72ch;
  margin: 0 0 clamp(16px, 3vw, 24px);
  font-size: var(--step-17);
  line-height: 1.85;
  color: var(--ink-700);
}

.page-faq .tut-note {
  max-width: 72ch;
  margin: clamp(16px, 3vw, 24px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--faq-line-strong);
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--slate-500);
}

.page-faq .tut-note a {
  color: var(--cabin-500);
  text-decoration: underline;
  text-decoration-color: var(--sand-500);
  text-underline-offset: 3px;
}

.page-faq .tut-note a:hover {
  color: var(--ink-900);
}

/* ---------- 步骤列表 ---------- */

.page-faq .tut-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: faqstep;
}

.page-faq .tut-step {
  position: relative;
  counter-increment: faqstep;
  padding: 16px 0 18px 44px;
  border-bottom: 1px solid var(--faq-line);
}

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

.page-faq .tut-step::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 17px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-pill);
  background: var(--ink-900);
  color: var(--sand-500);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.page-faq .tut-step__title {
  margin: 0 0 6px;
  font-size: var(--step-17);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-faq .tut-step__desc {
  max-width: 72ch;
  margin: 0;
  font-size: var(--step-17);
  line-height: 1.8;
  color: var(--ink-700);
}

.page-faq .tut-step__desc a {
  color: var(--cabin-500);
  text-decoration: underline;
  text-decoration-color: var(--sand-500);
  text-underline-offset: 3px;
}

.page-faq .tut-step__desc a:hover {
  color: var(--ink-900);
}

.page-faq .tut-step__result {
  max-width: 70ch;
  margin: 10px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--jade-400);
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--cabin-500);
}

/* ---------- 跳转胶囊 ---------- */

.page-faq .tut-jump {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
  padding: 11px 20px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-pill);
  font-size: var(--step-14);
  color: var(--cabin-500);
  text-decoration: none;
  transition: border-color 180ms var(--ease-out), background-color 180ms var(--ease-out), color 180ms var(--ease-out);
}

.page-faq .tut-jump::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: var(--step-14);
  transition: transform 180ms var(--ease-out);
}

.page-faq .tut-jump:hover,
.page-faq .tut-jump:focus-visible {
  border-color: var(--sand-500);
  background: var(--faq-sand-wash);
  color: var(--ink-900);
}

.page-faq .tut-jump:hover::after {
  transform: translateX(4px);
}

/* ---------- 图文分栏 ---------- */

.page-faq .tut-split {
  display: grid;
  gap: clamp(20px, 4vw, 34px);
}

.page-faq .tut-split > * {
  min-width: 0;
}

.page-faq .tut-figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-md);
  background: linear-gradient(155deg, var(--cabin-500), var(--ink-900));
}

.page-faq .tut-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: calc(var(--radius-md) - 8px);
  object-fit: cover;
}

.page-faq .tut-figure figcaption {
  padding: 10px 6px 4px;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--mist-200);
}

.page-faq .tut-figure--square {
  max-width: 400px;
}

/* ---------- 组合检索 ---------- */

.page-faq .tut-combos {
  display: grid;
  gap: 10px;
  margin: 0 0 clamp(16px, 3vw, 24px);
  padding: 0;
  list-style: none;
}

.page-faq .tut-combo {
  padding: 14px 18px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius-sm);
  background: var(--faq-wash);
}

.page-faq .tut-combo__code {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--step-14);
  letter-spacing: 0.01em;
  color: var(--cabin-500);
}

.page-faq .tut-combo__desc {
  margin: 0;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--ink-700);
}

/* ---------- 要点列表 ---------- */

.page-faq .tut-bullets {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .tut-bullets li {
  position: relative;
  padding-left: 22px;
  font-size: var(--step-17);
  line-height: 1.8;
  color: var(--ink-700);
}

.page-faq .tut-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sand-500);
}

/* ---------- 场景对照 ---------- */

.page-faq .tut-compare {
  border-top: 1px solid var(--faq-line-strong);
}

.page-faq .tut-compare__head {
  display: none;
}

.page-faq .tut-compare__row {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 3vw, 22px) 0;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .tut-compare__scene {
  margin: 0;
  font-size: var(--step-17);
  font-weight: 500;
  line-height: 1.7;
  color: var(--ink-900);
}

.page-faq .tut-compare__tier {
  margin: 0;
}

.page-faq .tut-compare__why {
  margin: 0;
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 折叠问答 ---------- */

.page-faq .tut-faq {
  border-top: 1px solid var(--faq-line-strong);
}

.page-faq .tut-faq details {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .tut-faq summary {
  position: relative;
  display: block;
  padding: 18px 36px 18px 20px;
  font-size: var(--step-17);
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink-900);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .tut-faq summary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: var(--radius-pill);
  background: var(--slate-500);
  opacity: 0.45;
  transition: width 180ms var(--ease-out), background-color 180ms var(--ease-out), opacity 180ms var(--ease-out);
}

.page-faq .tut-faq details[open] > summary::before {
  width: 4px;
  background: var(--sand-500);
  opacity: 1;
}

.page-faq .tut-faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: var(--step-17);
  font-weight: 400;
  color: var(--slate-500);
}

.page-faq .tut-faq details[open] > summary::after {
  content: "−";
  color: var(--sand-500);
}

.page-faq .tut-faq__a {
  max-width: 72ch;
  padding: 0 36px 20px 20px;
}

.page-faq .tut-faq__a p {
  margin: 0;
  font-size: var(--step-17);
  line-height: 1.85;
  color: var(--ink-700);
}

.page-faq .tut-faq__a a {
  color: var(--cabin-500);
  text-decoration: underline;
  text-decoration-color: var(--sand-500);
  text-underline-offset: 3px;
}

.page-faq .tut-faq__a a:hover {
  color: var(--ink-900);
}

/* ---------- 章节索引 ---------- */

.page-faq .tut-index {
  order: -1;
  min-width: 0;
}

.page-faq .tut-index__title {
  margin: 0 0 10px;
  font-size: var(--step-12);
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--slate-500);
}

.page-faq .tut-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .tut-index__list li {
  flex: none;
}

.page-faq .tut-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--faq-line-strong);
  border-radius: var(--radius-pill);
  font-size: var(--step-14);
  white-space: nowrap;
  color: var(--cabin-500);
  text-decoration: none;
  transition: border-color 180ms var(--ease-out), background-color 180ms var(--ease-out), color 180ms var(--ease-out);
}

.page-faq .tut-index__list a:hover,
.page-faq .tut-index__list a:focus-visible {
  border-color: var(--sand-500);
  background: var(--faq-sand-wash);
  color: var(--ink-900);
}

.page-faq .tut-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--slate-500);
}

.page-faq .tut-index__label {
  font-weight: 500;
}

/* ---------- 响应式 ---------- */

@media (min-width: 780px) {
  .page-faq .tut-compare__head {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) 116px minmax(0, 1.4fr);
    gap: 24px;
    padding: 12px 0;
    border-bottom: 1px solid var(--faq-line-strong);
    font-size: var(--step-12);
    letter-spacing: 0.14em;
    color: var(--slate-500);
  }

  .page-faq .tut-compare__row {
    grid-template-columns: minmax(0, 1.15fr) 116px minmax(0, 1.4fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-faq .tut-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 348px);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-faq .tut-body {
    grid-template-columns: minmax(0, 1fr) 248px;
    column-gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

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

  .page-faq .tut-index {
    grid-column: 2;
    grid-row: 1;
    order: 0;
    position: sticky;
    top: 96px;
  }

  .page-faq .tut-index__title {
    margin-bottom: 14px;
  }

  .page-faq .tut-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .tut-index__list a {
    width: 100%;
    padding: 8px 12px;
    border-color: transparent;
    border-left: 2px solid var(--faq-line-strong);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  }

  .page-faq .tut-index__list a:hover,
  .page-faq .tut-index__list a:focus-visible {
    border-left-color: var(--sand-500);
    background: var(--faq-sand-wash);
  }
}

@media (max-width: 520px) {
  .page-faq .tut-step {
    padding-left: 38px;
  }

  .page-faq .tut-step::before {
    width: 26px;
    height: 26px;
    font-size: 10px;
  }

  .page-faq .tut-faq summary {
    padding: 16px 30px 16px 18px;
  }

  .page-faq .tut-faq__a {
    padding: 0 22px 18px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .tut-jump,
  .page-faq .tut-jump::after,
  .page-faq .tut-index__list a,
  .page-faq .tut-faq summary::before,
  .page-faq .tut-crumb a {
    transition: none;
  }
}