.orange-studio-docs-prototype {
  --osd-ink: #1d1d1f;
  --osd-body: #4b4b50;
  --osd-muted: #86868b;
  --osd-primary: #ff6b00;
  --osd-primary-ink: #c2410c;
  --osd-soft: #fff7f1;
  --osd-soft-2: #f5f5f7;
  --osd-line: #e8eaee;
  --osd-max: 1520px;
  position: relative;
  background: #ffffff;
  color: var(--osd-ink);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.orange-studio-docs-prototype * {
  box-sizing: border-box;
}

.osd-main {
  padding: clamp(40px, 5vw, 64px) 0 clamp(56px, 7vw, 96px);
}

.osd-container {
  width: min(var(--osd-max), calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 208px;
  gap: clamp(32px, 4vw, 56px);
  align-items: start;
}

/* ---------- 左侧菜单 ---------- */
.osd-side {
  position: sticky;
  top: 104px;
}

.osd-nav__group + .osd-nav__group {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--osd-line);
}

.osd-nav__group-title {
  position: relative;
  margin: 0 0 10px;
  padding: 0 14px 0 25px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--osd-ink);
}

.osd-nav__group-title::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 14px;
  border-radius: 2px;
  background: var(--osd-primary);
}

.osd-nav__item {
  display: block;
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--osd-body);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.osd-nav__item:hover {
  background: var(--osd-soft-2);
  color: var(--osd-ink);
}

.osd-nav__item.is-active {
  background: var(--osd-soft);
  color: var(--osd-primary-ink);
  font-weight: 600;
}

/* ---------- 中间正文 ---------- */
.osd-doc {
  max-width: 980px;
  min-width: 0;
}

.osd-doc__title {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--osd-ink);
}

.osd-doc__intro {
  margin: 24px 0 0;
  padding: 18px 22px;
  border-left: 3px solid var(--osd-primary);
  border-radius: 0 10px 10px 0;
  background: var(--osd-soft);
  font-size: 15px;
  line-height: 1.85;
  color: var(--osd-body);
}

.osd-doc__body {
  margin-top: 8px;
}

.osd-doc__body h2 {
  margin: 48px 0 16px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--osd-ink);
  scroll-margin-top: 104px;
}

.osd-doc__body h2:first-child {
  margin-top: 32px;
}

.osd-doc__body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--osd-body);
}

.osd-doc__body ul,
.osd-doc__body ol {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}

.osd-doc__body > ul > li,
.osd-doc__body ul ul > li {
  position: relative;
  padding-left: 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--osd-body);
}

.osd-doc__body > ul > li {
  margin-bottom: 12px;
}

.osd-doc__body ul ul {
  margin: 8px 0 0;
  display: grid;
  gap: 8px;
}

.osd-doc__body > ul > li::before,
.osd-doc__body ul ul > li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--osd-primary);
}

.osd-doc__body ul ul > li::before {
  width: 5px;
  height: 5px;
  background: var(--osd-muted);
}

.osd-doc__body strong {
  color: var(--osd-ink);
  font-weight: 600;
}

.osd-doc__body a {
  color: var(--osd-primary-ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.osd-doc__updated {
  margin: 40px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--osd-line);
  font-size: 13px;
  color: var(--osd-muted);
}

/* ---------- 右侧本页目录 ---------- */
.osd-toc {
  position: sticky;
  top: 104px;
}

.osd-toc__title {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--osd-muted);
}

.osd-toc__list {
  display: grid;
  gap: 2px;
}

.osd-toc__link {
  display: block;
  padding: 7px 0 7px 12px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.5;
  color: var(--osd-muted);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.osd-toc__link:hover {
  color: var(--osd-ink);
}

.osd-toc__link.is-active {
  color: var(--osd-primary);
  border-left-color: var(--osd-primary);
  font-weight: 600;
}

.osd-toc.is-empty {
  display: none;
}

/* ---------- 最小幅度移动端适配 ---------- */
@media (max-width: 1024px) {
  .osd-container {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .osd-side {
    position: static;
  }

  .osd-nav__group {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .osd-nav__group-title {
    flex: 0 0 auto;
    margin: 0;
    padding: 0 4px 0 0;
    font-size: 13px;
    white-space: nowrap;
  }

  .osd-nav__group-title::before {
    display: none;
  }

  .osd-nav__item {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 8px 14px;
    border: 1px solid var(--osd-line);
  }

  .osd-toc {
    display: none;
  }
}

@media (max-width: 640px) {
  .osd-container {
    width: calc(100% - 32px);
  }

  .osd-doc__body h2 {
    margin-top: 36px;
    font-size: 21px;
  }
}