:root {
  --md-sys-color-primary: #6750A4;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-secondary-container: #E8DEF8;
  --md-sys-color-on-secondary-container: #1D192B;
  --md-sys-color-surface: #FEF7FF;
  --md-sys-color-on-surface: #1D1B20;
  --md-sys-color-surface-variant: #E7E0EC;
  --md-sys-color-on-surface-variant: #49454F;
  --md-sys-color-surface-container-lowest: #FFFFFF;
  --md-sys-color-surface-container-low: #F7F2FA;
  --md-sys-color-surface-container: #F3EDF7;
  --md-sys-color-surface-container-highest: #E6E0E9;
  --md-sys-color-outline: #79747E;
  --md-sys-color-outline-variant: #CAC4D0;
  --md-sys-color-background: #FEF7FF;
  --md-sys-color-on-background: #1D1B20;
  --md-elevation-1: 0px 1px 2px 0px rgba(0,0,0,0.3), 0px 1px 3px 1px rgba(0,0,0,0.15);
}

@media (prefers-color-scheme: dark) {
  :root {
    --md-sys-color-primary: #D0BCFF;
    --md-sys-color-on-primary: #381E72;
    --md-sys-color-secondary-container: #4A4458;
    --md-sys-color-on-secondary-container: #E8DEF8;
    --md-sys-color-surface: #141218;
    --md-sys-color-on-surface: #E6E0E9;
    --md-sys-color-surface-variant: #49454F;
    --md-sys-color-on-surface-variant: #CAC4D0;
    --md-sys-color-surface-container-lowest: #0F0D13;
    --md-sys-color-surface-container-low: #1D1B20;
    --md-sys-color-surface-container: #211F26;
    --md-sys-color-surface-container-highest: #36343B;
    --md-sys-color-outline: #938F99;
    --md-sys-color-outline-variant: #49454F;
    --md-sys-color-background: #141218;
    --md-sys-color-on-background: #E6E0E9;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Roboto', "Microsoft YaHei", sans-serif;
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  display: flex;
  min-height: 100vh;
}

.md-typescale-headline-medium { font-size: 28px; font-weight: 400; line-height: 36px; margin: 0 0 16px 0; }
.md-typescale-headline-small { font-size: 24px; font-weight: 400; line-height: 32px; margin: 0 0 16px 0; }
.md-typescale-title-large { font-size: 22px; font-weight: 500; line-height: 28px; margin: 24px 0 12px 0; }
.md-typescale-title-small { font-size: 14px; font-weight: 500; line-height: 20px; letter-spacing: 0.1px; }
.md-typescale-body-large { font-size: 16px; font-weight: 400; line-height: 24px; letter-spacing: 0.5px; margin: 0 0 16px 0; }
.md-typescale-body-medium { font-size: 14px; font-weight: 400; line-height: 20px; letter-spacing: 0.25px; }
.md-typescale-body-small { font-size: 12px; font-weight: 400; line-height: 16px; letter-spacing: 0.4px; }
.md-typescale-label-large { font-size: 14px; font-weight: 500; line-height: 20px; letter-spacing: 0.1px; }

.text-primary { color: var(--md-sys-color-primary); }
.text-outline { color: var(--md-sys-color-outline); }
.text-right { text-align: right; }
.text-center { text-align: center; }

.layout-container {
  display: flex;
  width: 100%;
}

.md-nav-drawer {
  width: 360px;
  background-color: var(--md-sys-color-surface-container-low);
  padding: 12px;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
}

.md-nav-header {
  padding: 18px 16px;
  margin-bottom: 8px;
}

.md-nav-content {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.md-nav-section {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
}

.md-nav-title {
  padding: 18px 16px;
  color: var(--md-sys-color-on-surface-variant);
}

.md-nav-item {
  display: flex;
  align-items: center;
  padding: 16px 24px;
  text-decoration: none;
  color: var(--md-sys-color-on-surface-variant);
  border-radius: 28px;
  margin-bottom: 4px;
  transition: background-color 0.2s;
}

.md-nav-item:hover {
  background-color: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface);
}

.md-nav-item.active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  font-weight: 500;
}

.md-nav-icon {
  margin-right: 12px;
  font-size: 24px;
}

.md-divider {
  height: 1px;
  background-color: var(--md-sys-color-outline-variant);
  margin: 16px 0;
  border: none;
}

.md-nav-footer {
  margin-top: auto;
  padding: 16px;
  color: var(--md-sys-color-on-surface-variant);
}

.md-main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.md-top-app-bar {
  display: flex;
  align-items: center;
  height: 64px;
  padding: 0 16px;
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

.md-icon-button {
  background: transparent;
  border: none;
  color: inherit;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin-right: 12px;
}

.md-icon-button:hover {
  background-color: var(--md-sys-color-surface-container-highest);
}

#menu-btn {
  display: none;
}

.md-content-body {
  padding: 24px;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}

.md-card {
  background-color: var(--md-sys-color-surface-container-lowest);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--md-elevation-1);
  margin-bottom: 24px;
  scroll-margin-top: 72px;
}

.md-list {
  padding-left: 24px;
}

.md-list li {
  margin-bottom: 8px;
}

.md-link {
  color: var(--md-sys-color-primary);
  text-decoration: none;
  font-weight: 500;
}

.md-link:hover {
  text-decoration: underline;
}

.md-table-container {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--md-sys-color-outline-variant);
  margin-bottom: 16px;
}

.md-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.md-table th, .md-table td {
  padding: 16px;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.md-table th {
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  font-weight: 500;
}

.md-footer {
  padding: 24px;
  text-align: center;
  color: var(--md-sys-color-outline);
  margin-top: auto;
}

.md-scrim {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.32);
  z-index: 50;
}

@media (max-width: 840px) {
  .md-nav-drawer {
    position: fixed;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }
  .md-nav-drawer.open {
    transform: translateX(0);
  }
  #menu-btn {
    display: flex;
  }
  .md-scrim.open {
    display: block;
  }
}

/* Compact Mobile Screen Tuning (MD3 Guidelines) */
@media (max-width: 600px) {
  .md-content-body {
    padding: 16px;
  }
  .md-card {
    padding: 16px;
    scroll-margin-top: 64px;
  }
  .md-typescale-headline-medium {
    font-size: 24px;
    line-height: 32px;
  }
  .md-table th, .md-table td {
    padding: 12px 8px;
  }
}