/* ============================================================
   知数帮助中心 · 与官网共用品牌导航的文档体验
   ============================================================ */

.doc-page {
  --doc-surface: var(--home-paper-light);
  --doc-line: color-mix(in oklab, var(--home-ink) 16%, transparent);
  --doc-line-strong: color-mix(in oklab, var(--home-ink) 25%, transparent);
  --doc-shadow: 0 24px 70px color-mix(in oklab, var(--home-ink) 7%, transparent);
}

.doc-page main {
  min-height: calc(100svh - 4.75rem);
  background-image:
    radial-gradient(circle at 10% 9%, color-mix(in oklab, var(--home-purple) 8%, transparent) 0 1px, transparent 1.4px),
    linear-gradient(115deg, transparent 0 72%, color-mix(in oklab, var(--home-purple) 3%, transparent) 72% 88%, transparent 88%);
  background-size: 15px 15px, auto;
}

.doc-page .home-nav .nav-links a[aria-current] {
  color: var(--home-ink);
}

.doc-page .home-nav .nav-links a[aria-current]::after {
  scale: 1 1;
}

/* ---------- 布局骨架 ---------- */

.doc-layout {
  display: grid;
  grid-template-columns: 13.5rem minmax(0, 1fr);
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: start;
  padding-block: clamp(3.5rem, 7vw, 6.5rem) clamp(5rem, 9vw, 8rem);
}

.doc-side {
  position: sticky;
  top: 6.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--doc-line-strong);
}

.doc-side-label {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1.4rem;
  color: var(--home-ink);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.doc-side-label::before {
  content: "DOCS";
  color: var(--home-purple-deep);
}

.doc-side-label::after {
  content: "";
  width: 1.5rem;
  height: 1px;
  margin-left: auto;
  background: var(--home-purple);
}

.doc-side nav ul {
  display: grid;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.doc-group {
  margin: 1.45rem 0 0.45rem;
  color: var(--home-muted);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.doc-side nav li:first-child .doc-group { margin-top: 0; }

.doc-side nav a {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 2.65rem;
  padding: 0.55rem 0.75rem;
  border-radius: 0.55rem;
  color: var(--home-muted);
  font-size: 0.88rem;
  line-height: 1.4;
  text-decoration: none;
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease), translate 0.22s var(--ease);
}

.doc-side nav a:hover {
  color: var(--home-ink);
  background: color-mix(in oklab, var(--home-purple) 5%, var(--doc-surface));
  translate: 0.15rem 0;
}

.doc-side nav a.is-active {
  color: var(--home-purple-deep);
  background: color-mix(in oklab, var(--home-purple) 9%, var(--doc-surface));
  font-weight: 600;
}

.doc-side nav a.is-active::before {
  content: "";
  position: absolute;
  inset: 0.5rem auto 0.5rem 0;
  width: 2px;
  border-radius: 999px;
  background: var(--home-purple);
}

/* ---------- 文章 ---------- */

.doc-article {
  min-width: 0;
  max-width: 52rem;
  padding: clamp(2rem, 4vw, 3.75rem);
  border: 1px solid var(--doc-line);
  border-radius: 1.4rem;
  background: color-mix(in oklab, var(--doc-surface) 94%, transparent);
  box-shadow: var(--doc-shadow);
}

.doc-crumbs {
  margin-bottom: 1.35rem;
  color: var(--home-muted);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
}

.doc-crumbs a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.doc-crumbs a:hover { color: var(--home-purple-deep); }
.doc-crumbs .sep { margin-inline: 0.6em; color: var(--doc-line-strong); }

.doc-article h1 {
  margin-bottom: 0.8rem;
  color: var(--home-ink);
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 600;
  letter-spacing: -0.025em;
}

.doc-meta {
  margin-bottom: 2.4rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--doc-line);
  color: var(--home-muted);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.doc-article h2 {
  margin: 3rem 0 0.95rem;
  color: var(--home-ink);
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  letter-spacing: -0.015em;
}

.doc-article h2::before {
  content: "";
  display: inline-block;
  width: 1.1rem;
  height: 2px;
  margin-right: 0.65rem;
  vertical-align: 0.28em;
  background: var(--home-purple);
}

.doc-article h3 {
  margin: 2rem 0 0.7rem;
  color: var(--home-ink);
  font-size: 1.12rem;
}

.doc-article p {
  margin-bottom: 1rem;
  color: color-mix(in oklab, var(--home-ink) 88%, var(--home-muted));
  line-height: 1.95;
}

.doc-article ul,
.doc-article ol {
  margin: 0 0 1.25rem;
  padding-left: 1.35rem;
  color: color-mix(in oklab, var(--home-ink) 88%, var(--home-muted));
  line-height: 1.9;
}

.doc-article li { margin-bottom: 0.5rem; }
.doc-article li::marker { color: var(--home-purple); }

.doc-article a {
  color: var(--home-purple-deep);
  text-decoration-color: color-mix(in oklab, var(--home-purple) 42%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.doc-article a:hover { text-decoration-color: var(--home-purple); }
.doc-article strong { color: var(--home-ink); font-weight: 650; }

code {
  padding: 0.12em 0.42em;
  border: 1px solid var(--doc-line);
  border-radius: 0.35rem;
  background: color-mix(in oklab, var(--home-purple) 5%, var(--doc-surface));
  font-family: var(--mono);
  font-size: 0.86em;
}

pre {
  margin: 0 0 1.35rem;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--doc-line);
  border-radius: 0.8rem;
  background: var(--home-paper);
  line-height: 1.8;
}

pre code {
  padding: 0;
  border: 0;
  background: none;
  font-size: 0.82rem;
}

.doc-article .kbd {
  border-color: var(--doc-line-strong);
  border-bottom-width: 2px;
  background: var(--doc-surface);
  color: var(--home-ink);
}

/* ---------- 帮助中心首页 ---------- */

.doc-home {
  max-width: none;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.doc-home-hero {
  max-width: 60rem;
  padding: 0.4rem 0 clamp(2.8rem, 6vw, 5rem);
}

.doc-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.4rem !important;
  color: var(--home-purple-deep) !important;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
}

.doc-eyebrow::before {
  content: "";
  width: 1.8rem;
  height: 2px;
  background: var(--home-purple);
}

.doc-home h1 {
  max-width: 54rem;
  margin-bottom: 1.35rem;
  font-size: clamp(3.2rem, 6.5vw, 5.9rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.055em;
}

.doc-home-lead {
  max-width: 46rem;
  margin-bottom: 2rem !important;
  color: var(--home-muted) !important;
  font-size: clamp(1.02rem, 1.7vw, 1.2rem);
  line-height: 1.85 !important;
}

.doc-home-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.4rem;
  color: var(--home-muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.doc-home-facts span {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.doc-home-facts span::before {
  content: "";
  width: 0.35rem;
  height: 0.35rem;
  border-radius: 50%;
  background: var(--home-purple);
}

.doc-index-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.doc-index-card {
  position: relative;
  display: flex;
  min-height: 20rem;
  flex-direction: column;
  padding: 1.55rem;
  overflow: hidden;
  border: 1px solid var(--doc-line);
  border-radius: 1rem;
  background: color-mix(in oklab, var(--doc-surface) 92%, transparent);
  color: var(--home-ink) !important;
  text-decoration: none !important;
  box-shadow: 0 12px 30px color-mix(in oklab, var(--home-ink) 4%, transparent);
  transition: border-color 0.28s var(--ease), box-shadow 0.28s var(--ease), translate 0.28s var(--ease);
}

.doc-index-card::after {
  content: "";
  position: absolute;
  inset: auto -2.5rem -3.8rem auto;
  width: 8rem;
  height: 8rem;
  border: 1px solid color-mix(in oklab, var(--home-purple) 18%, transparent);
  border-radius: 50%;
  transition: scale 0.35s var(--ease);
}

.doc-index-card:hover {
  border-color: color-mix(in oklab, var(--home-purple) 45%, transparent);
  box-shadow: 0 20px 44px color-mix(in oklab, var(--home-ink) 8%, transparent);
  translate: 0 -0.25rem;
}

.doc-index-card:hover::after { scale: 1.12; }

.doc-index-card:first-child {
  background: color-mix(in oklab, var(--home-purple) 7%, var(--doc-surface));
}

.doc-index-no {
  color: var(--home-purple-deep);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
}

.doc-index-title {
  margin-top: 2.4rem;
  font-family: var(--serif);
  font-size: clamp(1.4rem, 2vw, 1.75rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.doc-index-desc {
  margin-top: 0.9rem;
  color: var(--home-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}

.doc-index-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: auto;
  padding-top: 1.4rem;
  border-top: 1px solid var(--doc-line);
  color: var(--home-ink);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.doc-index-cta span {
  color: var(--home-purple-deep);
  font-size: 1rem;
  transition: translate 0.25s var(--ease);
}

.doc-index-card:hover .doc-index-cta span { translate: 0.18rem -0.18rem; }

/* ---------- 文章组件 ---------- */

.doc-toc {
  margin-bottom: 2.6rem;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--doc-line);
  border-radius: 0.9rem;
  background: color-mix(in oklab, var(--home-purple) 4%, var(--home-paper));
}

.doc-toc-label {
  margin-bottom: 0.7rem !important;
  color: var(--home-purple-deep) !important;
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.doc-toc ol {
  margin: 0;
  padding: 0;
  columns: 2;
  column-gap: 2rem;
  list-style: none;
}

.doc-toc li {
  margin: 0 0 0.35rem;
  break-inside: avoid;
}

.doc-toc a {
  color: var(--home-muted);
  font-size: 0.88rem;
  text-decoration: none;
}

.doc-toc a:hover { color: var(--home-purple-deep); }

.step-block { margin-top: 3rem; }

.step-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.6rem;
  color: var(--home-purple-deep);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
}

.step-tag::after {
  content: "";
  width: 2.2rem;
  height: 1px;
  background: color-mix(in oklab, var(--home-purple) 48%, transparent);
}

.step-block h2 { margin: 0 0 0.85rem; }
.step-block h2::before { content: none; }

.callout {
  position: relative;
  margin: 0 0 1.4rem;
  padding: 1rem 1.2rem 1rem 1.35rem;
  border: 1px solid var(--doc-line);
  border-left: 3px solid var(--home-purple);
  border-radius: 0.75rem;
  background: color-mix(in oklab, var(--home-purple) 5%, var(--doc-surface));
  color: var(--home-ink);
  font-size: 0.92rem;
  line-height: 1.85;
}

.callout-warn {
  border-left-color: var(--home-acid);
  background: color-mix(in oklab, var(--home-acid) 9%, var(--doc-surface));
}

.callout strong { color: var(--home-purple-deep); }

.doc-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-top: 3.5rem;
  padding-top: 1.7rem;
  border-top: 1px solid var(--doc-line-strong);
}

.pager-card {
  display: grid;
  gap: 0.35rem;
  min-height: 6.2rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--doc-line);
  border-radius: 0.8rem;
  background: var(--home-paper);
  text-decoration: none !important;
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease), translate 0.24s var(--ease);
}

.pager-card:hover {
  border-color: color-mix(in oklab, var(--home-purple) 38%, transparent);
  background: color-mix(in oklab, var(--home-purple) 4%, var(--home-paper));
  translate: 0 -0.12rem;
}

.pager-card.next { text-align: right; }

.pager-label {
  color: var(--home-muted);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.pager-title {
  color: var(--home-ink);
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
}

.pager-card.next .pager-title::after { content: " →"; color: var(--home-purple); }
.pager-card.prev .pager-title::before { content: "← "; color: var(--home-purple); }
.pager-spacer { visibility: hidden; }

/* ---------- 响应式 ---------- */

@media (max-width: 1040px) {
  .doc-layout {
    grid-template-columns: 12.5rem minmax(0, 1fr);
    gap: 2.5rem;
  }

  .doc-index-card { min-height: 18rem; padding: 1.3rem; }
}

@media (max-width: 900px) {
  .doc-layout {
    grid-template-columns: 1fr;
    gap: 2.2rem;
    padding-top: 2.5rem;
  }

  .doc-side {
    position: static;
    padding: 0 0 1rem;
    overflow: hidden;
    border-top: 0;
    border-bottom: 1px solid var(--doc-line);
  }

  .doc-side-label { margin-bottom: 0.65rem; }
  .doc-side-label::after { display: none; }

  .doc-side nav ul {
    display: flex;
    width: calc(100% + 2 * var(--gutter));
    margin-inline: calc(-1 * var(--gutter));
    padding-inline: var(--gutter);
    gap: 0.3rem;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scroll-snap-type: inline proximity;
    scrollbar-width: none;
  }

  .doc-side nav ul::-webkit-scrollbar { display: none; }
  .doc-side nav li { flex: 0 0 auto; scroll-snap-align: start; }
  .doc-group { display: none; }

  .doc-side nav a {
    min-height: 2.75rem;
    white-space: nowrap;
  }

  .doc-side nav a.is-active::before {
    inset: auto 0 0;
    width: auto;
    height: 2px;
  }

  .doc-article { max-width: none; }
}

@media (max-width: 720px) {
  .doc-page main { min-height: calc(100svh - 4.2rem); }

  .doc-layout {
    gap: 1.7rem;
    padding-block: 1.7rem 4rem;
  }

  .doc-article {
    padding: 1.35rem;
    border-radius: 1rem;
  }

  .doc-home { padding: 0; }

  .doc-home-hero { padding-bottom: 2.6rem; }

  .doc-home h1 {
    font-size: clamp(2.65rem, 13vw, 4.2rem);
    line-height: 1.08;
  }

  .doc-home-facts {
    display: grid;
    gap: 0.45rem;
  }

  .doc-index-grid { grid-template-columns: 1fr; }

  .doc-index-card {
    min-height: 14.5rem;
    padding: 1.25rem;
  }

  .doc-index-title { margin-top: 1.5rem; }

  .doc-article h1 { font-size: clamp(2.1rem, 11vw, 3rem); }
  .doc-article h2 { margin-top: 2.4rem; }

  .doc-article p,
  .doc-article li {
    font-size: 0.98rem;
    line-height: 1.85;
  }

  .doc-toc ol { columns: 1; }
  .doc-pager { grid-template-columns: 1fr; }
  .pager-card { min-height: 5.4rem; }
}

@media (max-width: 420px) {
  .doc-eyebrow { font-size: 0.6rem; letter-spacing: 0.1em; }
  .doc-home h1 { font-size: clamp(2.25rem, 10vw, 2.6rem); line-height: 1.12; }
  .doc-home-lead { font-size: 1rem; }
  .doc-article { padding: 1.15rem; }
  .doc-crumbs { font-size: 0.64rem; }
}

@media (prefers-reduced-motion: reduce) {
  .doc-index-card,
  .doc-index-card::after,
  .doc-index-cta span,
  .doc-side nav a,
  .pager-card {
    transition: none;
  }
}