/* 使用教程页样式：沿用主站深色设计 token，左侧固定导航 + 右侧正文双栏布局。 */
:root {
  color-scheme: dark;
  --page: #0b0c0c;
  --surface: #151817;
  --surface-2: #1b1f1d;
  --ink: #f2f5f3;
  --muted: #a7b0ac;
  --line: #303734;
  --accent: #79d7a5;
  --sidebar-width: 268px;
  --header-height: 64px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
}

a {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--accent);
  border-radius: 8px;
  color: #06231a;
  font-weight: 700;
}

/* 顶栏：移动端承载抽屉开关，桌面端保持品牌与返回入口 */
.guide-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: var(--header-height);
  padding-inline: 20px;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.guide-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.guide-header-links {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.guide-header-links a {
  color: var(--muted);
  text-decoration: none;
}

.guide-header-links a:hover {
  color: var(--ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  font-size: 18px;
  cursor: pointer;
}

/* 双栏骨架 */
.guide-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 48px;
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
  align-items: start;
}

/* 左侧导航：桌面端固定吸附，滚动时保持可见 */
.guide-sidebar {
  position: sticky;
  top: var(--header-height);
  max-height: calc(100vh - var(--header-height));
  padding: 32px 0 40px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
}

.guide-sidebar h2 {
  margin: 0 0 14px;
  padding-right: 20px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.guide-nav-group {
  margin-bottom: 26px;
}

.guide-nav-group > span {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
}

.guide-nav-group ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}

.guide-nav-group li a {
  display: block;
  padding: 7px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.guide-nav-group li a:hover {
  color: var(--ink);
}

/* 当前阅读位置：由 IntersectionObserver 同步 */
.guide-nav-group li a.is-active {
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  color: var(--ink);
  font-weight: 600;
}

/* 右侧正文 */
.guide-main {
  min-width: 0;
  padding: 40px 0 96px;
}

.guide-intro {
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.guide-intro h1 {
  margin: 0 0 12px;
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1.1;
}

.guide-intro p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
}

.guide-section {
  padding-top: 56px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.guide-section > h2 {
  margin: 0 0 8px;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.2;
}

.guide-section > h2 + p {
  margin-top: 0;
  color: var(--muted);
}

.guide-section h3 {
  margin: 34px 0 10px;
  font-size: 18px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.guide-main p,
.guide-main li {
  color: var(--muted);
}

.guide-main strong {
  color: var(--ink);
}

/* 步骤列表：编号与内容分离，便于扫读 */
.guide-steps {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: guide-step;
}

.guide-steps > li {
  position: relative;
  padding: 0 0 20px 44px;
  counter-increment: guide-step;
}

.guide-steps > li::before {
  content: counter(guide-step);
  position: absolute;
  left: 0;
  top: 1px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

.guide-steps > li > strong {
  display: block;
  margin-bottom: 2px;
  color: var(--ink);
}

.guide-steps p {
  margin: 0;
}

/* 提示块 */
.guide-note {
  margin: 22px 0 0;
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
}

.guide-note p {
  margin: 0;
  font-size: 14px;
}

.guide-note strong {
  color: var(--accent);
}

/* 代码块 */
.guide-main pre {
  margin: 18px 0 0;
  padding: 16px 18px;
  overflow-x: auto;
  background: #0e100f;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.guide-main pre code {
  color: #d6e5dc;
  font-size: 13.5px;
}

.guide-main code {
  font-family: "Cascadia Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.guide-main :not(pre) > code {
  padding: 2px 6px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  color: #cfe6da;
  font-size: 0.9em;
}

/* 平台选项卡片 */
.guide-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.guide-card {
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.guide-card h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.guide-card p {
  margin: 0;
  font-size: 14px;
}

/* 表格 */
.guide-table-wrap {
  margin-top: 20px;
  overflow-x: auto;
}

.guide-main table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.guide-main th,
.guide-main td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.guide-main th {
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.guide-main td {
  color: var(--muted);
}

.guide-footer {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

/* 移动端：导航收进抽屉，避免挤压正文宽度 */
@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .guide-shell {
    display: block;
    width: min(760px, calc(100% - 36px));
  }

  .guide-sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    z-index: 25;
    width: min(300px, 82vw);
    height: calc(100vh - var(--header-height));
    max-height: none;
    padding: 24px 20px 40px;
    background: var(--page);
    border-right: 1px solid var(--line);
    transform: translateX(-100%);
    transition: transform 0.22s ease;
  }

  .guide-sidebar.is-open {
    transform: translateX(0);
  }

  .guide-footer {
    width: min(760px, calc(100% - 36px));
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .guide-sidebar {
    transition: none;
  }
}