/* ============================================================
   教程中心 /tutorial/
   作用域：.page-guides
   ============================================================ */

.page-guides {
  --guides-stripe: var(--color-surface-alt);
  --guides-pad-x: var(--space-3);
}

/* ---------- 首屏 ---------- */

.page-guides .guides-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-top: var(--space-8);
  padding-bottom: var(--section-y);
}

.page-guides .guides-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-guides .guides-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-guides .guides-hero__media .media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

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

.page-guides .guides-hero__kicker {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

.page-guides .guides-hero__title {
  margin: var(--space-4) 0 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 1.04;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  max-width: 13ch;
  text-wrap: balance;
}

.page-guides .guides-hero__lead {
  margin: var(--space-4) 0 0;
  max-width: 52ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-guides .guides-figures {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

.page-guides .guides-figures > li {
  flex: 0 1 auto;
  min-width: 108px;
  padding-top: var(--space-2);
  border-top: var(--border-thick) solid var(--color-contrast-line);
}

.page-guides .guides-figures__n {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-guides .guides-figures__l {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

/* ---------- 目录刻度带 ---------- */

.page-guides .guides-scale {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-guides .guides-scale__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.page-guides .guides-scale__h {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.08em;
  color: var(--color-ink);
}

.page-guides .guides-scale__note {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-guides .guides-scale__track {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-guides .guides-scale__seg {
  padding: var(--space-2) var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
}

.page-guides .guides-scale__seg--a {
  background: var(--color-primary-soft);
}

.page-guides .guides-scale__seg--b {
  background: var(--color-highlight);
}

.page-guides .guides-scale__sn {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
}

.page-guides .guides-scale__sl {
  margin: var(--space-1) 0 var(--space-2);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-ink);
}

.page-guides .guides-scale__nodes {
  display: flex;
  gap: 4px;
}

.page-guides .guides-node {
  flex: 1 1 0;
  min-width: 0;
  display: block;
  padding: 6px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--color-primary-ink);
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s linear, color 0.15s linear;
}

.page-guides .guides-scale__nodes .guides-node:nth-child(2n) {
  background: var(--color-accent);
}

.page-guides .guides-node:hover,
.page-guides .guides-node:focus-visible {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}

.page-guides .guides-node:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

.page-guides .guides-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-guides .guides-chip {
  display: inline-block;
  padding: 8px 12px;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s linear, color 0.15s linear;
}

.page-guides .guides-chip:hover,
.page-guides .guides-chip:focus-visible {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-guides .guides-chip:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 分组外壳 ---------- */

.page-guides .guides-group--surface {
  --guides-stripe: var(--color-surface-alt);
}

.page-guides .guides-group--alt {
  --guides-stripe: var(--color-surface);
}

.page-guides .guides-group--dark {
  --guides-stripe: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
  color: var(--color-contrast-ink);
}

.page-guides .guides-group--accent {
  --guides-stripe: color-mix(in srgb, var(--color-accent-ink) 12%, transparent);
  color: var(--color-accent-ink);
}

.page-guides .guides-group__head {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

.page-guides .guides-group__h {
  margin: var(--space-3) 0 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: 1.14;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-guides .guides-group--dark .guides-group__h {
  color: var(--color-contrast-ink);
}

.page-guides .guides-group--accent .guides-group__h {
  color: var(--color-accent-ink);
}

.page-guides .guides-group__lead {
  margin: var(--space-3) 0 0;
  font-size: var(--text-lg);
  line-height: 1.58;
  color: var(--color-ink-soft);
}

.page-guides .guides-group--dark .guides-group__lead {
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-guides .guides-group--accent .guides-group__lead {
  color: color-mix(in srgb, var(--color-accent-ink) 86%, transparent);
}

/* ---------- 条目列表 ---------- */

.page-guides .guides-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-guides .guides-list > li {
  padding: var(--space-4) var(--guides-pad-x);
}

.page-guides .guides-list > li:nth-child(even) {
  background: var(--guides-stripe);
}

.page-guides .guides-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  align-items: start;
}

.page-guides .guides-item__no {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  color: var(--color-primary);
}

.page-guides .guides-group--dark .guides-item__no {
  color: var(--color-contrast-accent);
}

.page-guides .guides-group--accent .guides-item__no {
  color: var(--color-accent-ink);
}

.page-guides .guides-item__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.page-guides .guides-group--dark .guides-item__title {
  color: var(--color-contrast-ink);
}

.page-guides .guides-group--accent .guides-item__title {
  color: var(--color-accent-ink);
}

.page-guides .guides-item__desc {
  margin: var(--space-2) 0 0;
  max-width: 68ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-guides .guides-group--dark .guides-item__desc {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-guides .guides-group--accent .guides-item__desc {
  color: color-mix(in srgb, var(--color-accent-ink) 88%, transparent);
}

.page-guides .guides-item__fields {
  display: grid;
  gap: 6px;
  margin-top: var(--space-3);
}

.page-guides .guides-item__fields p {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-1);
  align-items: baseline;
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.62;
  color: var(--color-ink-soft);
}

.page-guides .guides-group--dark .guides-item__fields p {
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.page-guides .guides-group--accent .guides-item__fields p {
  color: color-mix(in srgb, var(--color-accent-ink) 84%, transparent);
}

.page-guides .guides-item__k {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--color-primary);
}

.page-guides .guides-group--dark .guides-item__k {
  color: var(--color-contrast-accent);
}

.page-guides .guides-group--accent .guides-item__k {
  color: var(--color-accent-ink);
}

.page-guides .guides-inline-link {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-guides .guides-inline-link:hover,
.page-guides .guides-inline-link:focus-visible {
  color: var(--color-ink);
}

/* ---------- 图片 ---------- */

.page-guides .guides-media {
  margin: var(--space-6) 0 0;
}

.page-guides .guides-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: calc(var(--radius-lg) * 4);
}

.page-guides .guides-media__cap {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-guides .guides-group--dark .guides-media__cap {
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ---------- 分屏示意 ---------- */

.page-guides .guides-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.page-guides .guides-split__grid {
  display: grid;
  gap: 3px;
  padding: 3px;
  aspect-ratio: 16 / 9;
  background: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  border-radius: var(--radius-sm);
}

.page-guides .guides-split__grid span {
  background: color-mix(in srgb, var(--color-contrast-accent) 42%, transparent);
  border-radius: 1px;
  transition: background-color 0.15s linear;
}

.page-guides .guides-split__item:hover .guides-split__grid span,
.page-guides .guides-split__grid:hover span {
  background: color-mix(in srgb, var(--color-contrast-accent) 82%, transparent);
}

.page-guides .guides-split__grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-guides .guides-split__grid--4 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
}

.page-guides .guides-split__grid--6 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
}

.page-guides .guides-split__grid--9 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(3, minmax(0, 1fr));
}

.page-guides .guides-split__cap {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

/* ---------- 相邻入口 ---------- */

.page-guides .guides-next__h {
  margin: var(--space-3) 0 0;
  max-width: 30ch;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: 1.2;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-guides .guides-next__list {
  display: grid;
  gap: var(--space-2);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

.page-guides .guides-next__list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px var(--space-2);
  align-items: baseline;
  padding: var(--space-3) 0;
  text-decoration: none;
  border-top: var(--border-thick) solid var(--color-ink-muted);
  transition: border-color 0.15s linear;
}

.page-guides .guides-next__list a:hover,
.page-guides .guides-next__list a:focus-visible {
  border-top-color: var(--color-primary);
}

.page-guides .guides-next__list a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 4px;
}

.page-guides .guides-next__no {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.page-guides .guides-next__name {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.04em;
  color: var(--color-ink);
  transition: color 0.15s linear;
}

.page-guides .guides-next__list a:hover .guides-next__name,
.page-guides .guides-next__list a:focus-visible .guides-next__name {
  color: var(--color-primary);
}

.page-guides .guides-next__desc {
  grid-column: 2 / -1;
  display: block;
  margin-top: 2px;
  max-width: 46ch;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 断点 ---------- */

@media (min-width: 760px) {
  .page-guides {
    --guides-pad-x: var(--space-4);
  }

  .page-guides .guides-hero {
    padding-top: var(--section-y-lg);
    padding-bottom: var(--section-y-lg);
  }

  .page-guides .guides-hero__title {
    max-width: 15ch;
  }

  .page-guides .guides-figures {
    margin-top: var(--space-8);
  }

  .page-guides .guides-scale {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .page-guides .guides-scale__track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-guides .guides-group__h {
    font-size: var(--text-4xl);
  }

  .page-guides .guides-item {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: var(--space-4);
  }

  .page-guides .guides-item__fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2) var(--space-4);
  }

  .page-guides .guides-split {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-guides .guides-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 var(--space-6);
  }
}

@media (min-width: 1040px) {
  .page-guides .guides-scale__track {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-guides .guides-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-guides .guides-next__h {
    font-size: var(--text-3xl);
  }
}

@media (max-width: 560px) {
  .page-guides .guides-figures {
    gap: var(--space-3) var(--space-4);
  }

  .page-guides .guides-figures > li {
    flex: 1 1 44%;
    min-width: 0;
  }

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

  .page-guides .guides-item__fields p {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }
}