/* ================= 教程中心 · page-faq ================= */

.page-faq {
  display: block;
  background: var(--ink-950);
  color: var(--paper-000);
}

/* ---------- 面包屑 ---------- */
.page-faq .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-faq .tut-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--ink-800);
  background:
    radial-gradient(95% 140% at 92% -10%, rgba(63, 227, 210, 0.16), rgba(63, 227, 210, 0) 58%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-950) 100%);
}

.page-faq .tut-hero::before,
.page-faq .tut-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  width: 1px;
  height: 175%;
  background: var(--ink-800);
  pointer-events: none;
}

.page-faq .tut-hero::before {
  right: 22%;
  transform: rotate(11deg);
}

.page-faq .tut-hero::after {
  right: -4%;
  transform: rotate(11deg);
  opacity: 0.6;
}

.page-faq .tut-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  padding-top: 32px;
  padding-bottom: 48px;
}

.page-faq .tut-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 6.6vw, 50px);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--paper-000);
}

.page-faq .tut-hero__lede {
  max-width: 46ch;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--slate-400);
}

.page-faq .tut-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .tut-facts {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--ink-800);
  list-style: none;
}

.page-faq .tut-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate-400);
}

.page-faq .tut-facts strong {
  flex: 0 0 auto;
  min-width: 4.5em;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  color: var(--cyan-400);
}

/* ---------- 主体双栏 ---------- */
.page-faq .tut-body {
  display: grid;
  gap: 32px;
  padding-top: 28px;
  padding-bottom: var(--step);
}

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

/* ---------- 目录 ---------- */
.page-faq .tut-toc {
  padding: 14px 16px 12px;
  border: 1px solid var(--ink-800);
  background: var(--ink-900);
}

.page-faq .tut-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-board);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber-300);
}

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

.page-faq .tut-toc__list li {
  flex: 0 0 auto;
}

.page-faq .tut-toc .anchor-index__link {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--ink-800);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--slate-400);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .tut-toc .anchor-index__link:hover,
.page-faq .tut-toc .anchor-index__link:focus-visible {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}

.page-faq .tut-toc__note {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate-400);
}

/* ---------- 章节 ---------- */
.page-faq .tut-section {
  margin-top: 64px;
  scroll-margin-top: 96px;
}

.page-faq .tut-section:first-child {
  margin-top: 0;
}

.page-faq .tut-section--deep + .tut-section--deep {
  padding-top: 56px;
  border-top: 1px solid var(--ink-800);
}

.page-faq .chapter {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 16px;
}

.page-faq .chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-faq .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.4vw, 31px);
  font-weight: 600;
  line-height: 1.28;
  color: var(--paper-000);
}

.page-faq .tut-lead {
  max-width: 62ch;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--slate-400);
}

/* ---------- 纸面区块 ---------- */
.page-faq .tut-section.tut-paper {
  padding: 30px 20px 34px;
  background-color: var(--cream-100);
  background-image:
    linear-gradient(rgba(8, 19, 31, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 19, 31, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  color: var(--ink-950);
}

.page-faq .tut-paper .chapter__num {
  color: var(--cyan-700);
}

.page-faq .tut-paper .chapter__title {
  color: var(--ink-950);
}

.page-faq .tut-paper .tut-lead,
.page-faq .tut-paper .tut-step__result,
.page-faq .tut-paper .ts {
  color: rgba(8, 19, 31, 0.72);
}

.page-faq .tut-paper .tut-step {
  border-top-color: var(--cream-200);
}

.page-faq .tut-paper .tut-step__action {
  color: var(--ink-950);
}

.page-faq .tut-paper .tut-step__num {
  color: var(--cyan-700);
}

.page-faq .tut-paper .tut-step__num::after {
  background: var(--cyan-700);
}

.page-faq .tut-paper .tut-step__result::before {
  color: var(--orange-500);
}

/* ---------- 步骤 ---------- */
.page-faq .tut-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .tut-step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--ink-800);
}

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

.page-faq .tut-step__num {
  position: relative;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--cyan-400);
}

.page-faq .tut-step__num::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  margin-top: 9px;
  background: var(--cyan-400);
}

.page-faq .tut-step__action {
  margin: 0;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.72;
  color: var(--paper-000);
}

.page-faq .tut-step__result {
  display: flex;
  gap: 8px;
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate-400);
}

.page-faq .tut-step__result::before {
  content: "→";
  flex: 0 0 auto;
  color: var(--orange-500);
}

/* ---------- 链接 ---------- */
.page-faq .tut-link {
  color: var(--cyan-400);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(63, 227, 210, 0.5);
}

.page-faq .tut-link:hover {
  text-decoration-color: var(--cyan-400);
}

.page-faq .tut-paper .tut-link {
  color: var(--ink-950);
  text-decoration-color: var(--orange-500);
}

.page-faq .tut-link:focus-visible,
.page-faq .tut-toc .anchor-index__link:focus-visible,
.page-faq .tut-acc > summary:focus-visible,
.page-faq .btn:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

/* ---------- 配图 ---------- */
.page-faq .tut-figure {
  margin: 0 0 30px;
}

.page-faq .tut-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--ink-800);
  background: var(--ink-900);
  object-fit: cover;
}

.page-faq .tut-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate-400);
}

/* ---------- 三层数据 ---------- */
.page-faq .layer-list {
  display: grid;
  gap: 16px;
}

.page-faq .layer {
  padding: 20px 18px 22px;
  border: 1px solid var(--ink-800);
  border-top: 2px solid var(--cyan-700);
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-950) 100%);
}

.page-faq .layer__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-faq .layer__name {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper-000);
}

.page-faq .layer__what {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper-000);
}

.page-faq .layer__where {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--ink-800);
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-400);
}

/* ---------- 行内提示 ---------- */
.page-faq .tut-inline-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--ink-800);
}

.page-faq .tut-inline-cta .ts {
  flex: 1 1 240px;
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate-400);
}

/* ---------- 折叠问答 ---------- */
.page-faq .tut-acc-group {
  display: grid;
  gap: 12px;
}

.page-faq .tut-acc {
  border: 1px solid var(--ink-800);
  border-left: 3px solid var(--ink-800);
  background: var(--ink-900);
  padding: 0 18px;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-faq .tut-acc[open] {
  border-left-color: var(--orange-500);
  background: var(--ink-950);
}

.page-faq .tut-acc > summary {
  position: relative;
  padding: 17px 34px 17px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-board);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--paper-000);
}

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

.page-faq .tut-acc > summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan-400);
}

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

.page-faq .tut-acc__body {
  display: grid;
  gap: 16px;
  padding: 0 0 20px;
}

.page-faq .qa {
  padding-left: 14px;
  border-left: 1px solid var(--ink-800);
}

.page-faq .qa__q {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.65;
  color: var(--paper-000);
}

.page-faq .qa__a {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--slate-400);
}

/* ---------- 联系区块 ---------- */
.page-faq .tut-contact {
  display: grid;
  gap: 26px;
}

.page-faq .tut-contact__hint {
  margin: 0 0 12px;
  font-family: var(--font-board);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-700);
}

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

.page-faq .tut-contact__list li {
  font-family: var(--font-mono);
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink-950);
}

.page-faq .tut-contact__list .tut-contact__note {
  font-family: var(--font-body);
  font-size: 14px;
  color: rgba(8, 19, 31, 0.72);
}

.page-faq .tut-contact__body {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(8, 19, 31, 0.78);
}

/* ---------- 显现动画 ---------- */
.page-faq .tut-section[data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.page-faq .tut-section[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-faq .tut-hero__inner {
    padding-top: 44px;
    padding-bottom: 60px;
  }

  .page-faq .layer-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .tut-section.tut-paper {
    padding: 38px 34px 44px;
  }

  .page-faq .tut-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 36px;
  }

  .page-faq .tut-acc__body {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 24px;
  }

  .page-faq .qa:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-faq .tut-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(250px, 0.72fr);
    align-items: end;
    gap: 72px;
    padding-top: 60px;
    padding-bottom: 76px;
  }

  .page-faq .tut-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 52px;
  }

  .page-faq .tut-toc {
    position: sticky;
    top: 24px;
    padding: 20px 18px;
  }

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

  .page-faq .tut-toc__list li {
    flex: 1 1 auto;
  }

  .page-faq .tut-toc .anchor-index__link {
    display: block;
    padding: 9px 10px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 13px;
    white-space: normal;
  }

  .page-faq .tut-toc .anchor-index__link:hover {
    color: var(--paper-000);
    background: rgba(63, 227, 210, 0.05);
  }

  .page-faq .tut-toc .anchor-index__link.is-active {
    border-left-color: var(--cyan-400);
    color: var(--cyan-400);
    background: rgba(63, 227, 210, 0.07);
  }

  .page-faq .tut-lead {
    font-size: 16.5px;
  }

  .page-faq .tut-acc__body {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px 26px;
  }

  .page-faq .qa:first-child {
    grid-column: auto;
  }
}

@media (min-width: 1440px) {
  .page-faq .tut-hero h1 {
    font-size: 54px;
  }

  .page-faq .tut-body {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 72px;
  }

  .page-faq .tut-section.tut-paper {
    padding: 46px 44px 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .tut-section[data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-faq .tut-acc,
  .page-faq .tut-toc .anchor-index__link {
    transition: none;
  }
}