* {
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --bg-soft: #f7f9fc;
  --text: #1f2a37;
  --text-muted: #5f6b7b;
  --line: #e5e8ef;
  --card: #ffffffd9;
  --shadow: 0 12px 30px rgba(18, 25, 38, 0.08);
  --primary: #2f78ff;
  --primary-strong: #1f62df;
}

[data-theme="dark"] {
  --bg: #0f1218;
  --bg-soft: #171d26;
  --text: #e7edf7;
  --text-muted: #a6b2c4;
  --line: #2a3342;
  --card: #1a2230d9;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  --primary: #6ba4ff;
  --primary-strong: #4b8cf7;
}

html,
body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

body {
  display: flex;
  flex-direction: column;
}


a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  --mobile-nav-top: 0px;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}

body.mobile-nav-open .navbar {
  --mobile-nav-top: 58px;
}

.navbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.brand img {
  width: 34px;
  height: 34px;
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-link {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 14px;
}

.nav-link.active,
.nav-link:hover {
  color: var(--text);
}

.btn {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-soft);
  color: var(--text);
  height: 36px;
  padding: 0 12px;
  cursor: pointer;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
}

.mobile-nav {
  position: fixed;
  top: var(--mobile-nav-top);
  left: 0;
  z-index: 70;
  width: min(320px, 86vw);
  height: calc(100dvh - var(--mobile-nav-top));
  border-right: 1px solid var(--line);
  background: var(--bg);
  box-shadow: 0 16px 40px rgba(16, 24, 40, 0.2);
  transform: translateX(-100%);
  transition: transform 0.24s ease;
  display: block;
  overflow: auto;
  visibility: hidden;
  pointer-events: none;
}

.mobile-nav-backdrop {
  position: fixed;
  top: var(--mobile-nav-top);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 60;
  background: rgba(15, 18, 24, 0.46);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.24s ease;
}

.mobile-nav-links {
  display: grid;
  gap: 6px;
  padding: 12px;
}

.mobile-nav-group {
  border-radius: 10px;
}

.mobile-nav-group + .mobile-nav-group {
  margin-top: 8px;
}

.mobile-nav-group-title {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  font-weight: 600;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
}

.mobile-nav-group-title::-webkit-details-marker {
  display: none;
}

.mobile-nav-group-title::marker {
  content: "";
}

.mobile-nav-group-title::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(-45deg);
  transition: transform 0.18s ease;
}

.mobile-nav-group[open] .mobile-nav-group-title::after {
  transform: rotate(45deg);
}

.mobile-nav-sublist {
  padding: 8px 10px 2px;
  display: grid;
  gap: 6px;
}

.mobile-nav-loading {
  color: var(--text-muted);
}

.mobile-nav-link {
  display: block;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text-muted);
  font-weight: 600;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
}

.mobile-nav-link.active {
  color: var(--text);
  border-color: color-mix(in srgb, var(--primary) 45%, var(--line));
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

.nav-toggle-icon {
  width: 18px;
  height: 14px;
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle-icon span {
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  display: block;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.navbar.mobile-open .nav-toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.navbar.mobile-open .nav-toggle-icon span:nth-child(2) {
  opacity: 0;
}

.navbar.mobile-open .nav-toggle-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

body.mobile-nav-open {
  overflow: hidden;
}

body.mobile-nav-open .mobile-nav {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

body.mobile-nav-open .mobile-nav-backdrop {
  opacity: 1;
  pointer-events: auto;
}

.page {
  padding: 28px 0 40px;
}

main {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

/* view containers no special scrolling */


.layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 20px;
  flex: 1;
  min-height: 0;
  height: 100%;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.sidebar {
  padding: 16px;
  overflow: auto;
  min-height: 0;
}

.sidebar h3 {
  margin: 0 0 12px;
  font-size: 16px;
}

.doc-list {
  display: grid;
  gap: 6px;
}

.sidebar a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-muted);
  font-weight: 600;
}

.sidebar a.active {
  background: color-mix(in srgb, var(--primary) 15%, transparent);
  color: var(--text);
}

.doc-link {
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text-muted);
  font-weight: 600;
  padding: 10px 12px;
  cursor: pointer;
}

.doc-link:hover {
  border-color: var(--line);
}

.doc-link.active {
  background: color-mix(in srgb, var(--primary) 15%, transparent);
  color: var(--text);
}

.content {
  padding: 22px;
  overflow: auto;
  min-height: 0;
}

.meta {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 14px;
}

.empty {
  margin-top: 18px;
  border: 1px dashed var(--line);
  border-radius: 12px;
  padding: 20px;
  color: var(--text-muted);
  background: var(--bg-soft);
}

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  display: grid;
  place-items: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 1200;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.back-to-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: color-mix(in srgb, var(--primary) 45%, var(--line));
  color: var(--primary);
  transform: translateY(-2px);
}

@media (max-width: 900px) {
  .page {
    padding: 16px 0 28px;
  }

  .navbar-inner {
    min-height: 58px;
    padding: 9px 0;
    flex-wrap: nowrap;
    gap: 10px;
  }

  .navbar {
    --mobile-nav-top: 58px;
  }

  .brand {
    min-width: 0;
    margin-right: auto;
  }

  .brand span {
    display: inline-block;
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    order: 0;
  }

  .btn[data-theme-toggle] {
    height: 40px;
    padding: 0 10px;
    font-size: 13px;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .content {
    padding: 16px;
  }

  .meta {
    margin-bottom: 10px;
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}