/* ==========================================================================
   Material Design 3 Expressive - Adaptive Layout
   Home Agent Wave 2
   ========================================================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  font: var(--md-sys-typescale-body-large);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* App Container (Flex for Rail on Desktop, Column on Mobile) */
.m3-app-shell {
  display: flex;
  width: 100vw;
  min-height: 100vh;
}

/* --- 1. Desktop Navigation Rail (>= 960px) --- */
.m3-nav-rail {
  width: 96px;
  background-color: var(--md-sys-color-surface-container-low);
  border-right: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem 0.5rem;
  gap: 1.5rem;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 40;
}

.m3-rail-brand {
  width: 52px;
  height: 52px;
  border-radius: var(--md-sys-shape-corner-medium);
  background-color: var(--md-sys-color-surface-container-high);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid var(--md-sys-color-outline-variant);
  box-shadow: var(--md-sys-elevation-1);
}
.m3-rail-brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
}

.m3-rail-items {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  align-items: center;
}

.m3-rail-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0;
  width: 72px;
  border-radius: var(--md-sys-shape-corner-large);
  color: var(--md-sys-color-on-surface-variant);
  cursor: pointer;
  transition: all var(--md-sys-motion-duration-short);
  text-decoration: none;
}
.m3-rail-item:hover {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--md-sys-color-on-surface);
}

.m3-rail-pill {
  width: 56px;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: background-color var(--md-sys-motion-duration-short);
  position: relative;
}
.m3-rail-label {
  font: var(--md-sys-typescale-label-small);
  text-align: center;
}

.m3-rail-item.active {
  color: var(--md-sys-color-on-surface);
}
.m3-rail-item.active .m3-rail-pill {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

/* --- 2. Main Viewport & Layout --- */
.m3-main-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-width: 100%;
}

/* Top App Bar */
.m3-top-app-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background-color: var(--md-sys-color-surface);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  position: sticky;
  top: 0;
  z-index: 30;
}

.m3-top-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.m3-view-title {
  font: var(--md-sys-typescale-headline-medium);
  color: var(--md-sys-color-on-surface);
}
.m3-version-badge {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-primary);
  font: var(--md-sys-typescale-label-small);
  padding: 0.2rem 0.6rem;
  border-radius: var(--md-sys-shape-corner-full);
  border: 1px solid var(--md-sys-color-outline-variant);
}

.m3-top-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Content Area */
.m3-content {
  flex: 1;
  padding: 2rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* Tab Panels */
.m3-tab-panel {
  display: none;
  animation: fadeIn 200ms ease;
}
.m3-tab-panel.active {
  display: block;
}

/* Responsive Grids using CSS Grid & Container Queries */
.m3-grid-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.m3-grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

/* --- 3. Mobile Bottom Navigation Bar (< 960px) --- */
.m3-bottom-nav-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(68px + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background-color: var(--md-sys-color-surface-container);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  z-index: 50;
  justify-content: space-around;
  align-items: center;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.35);
}

.m3-bottom-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  flex: 1;
  height: 100%;
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  cursor: pointer;
  min-height: 48px;
}

.m3-bottom-pill {
  width: 64px;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  position: relative;
  transition: background-color var(--md-sys-motion-duration-short);
}
.m3-bottom-label {
  font: var(--md-sys-typescale-label-small);
  font-weight: 500;
}

.m3-bottom-item.active {
  color: var(--md-sys-color-on-surface);
}
.m3-bottom-item.active .m3-bottom-pill {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

/* --- Mobile Responsiveness Adjustments --- */
@media (max-width: 959px) {
  .m3-nav-rail {
    display: none;
  }
  .m3-bottom-nav-bar {
    display: flex;
  }
  .m3-top-app-bar {
    padding: 0.75rem 1rem;
    padding-top: max(0.75rem, env(safe-area-inset-top));
  }
  .m3-content {
    padding: 1rem;
    padding-bottom: calc(88px + env(safe-area-inset-bottom));
  }
  .m3-grid-metrics {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
  }
  .m3-grid-cards {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .m3-fab {
    bottom: calc(76px + env(safe-area-inset-bottom));
    right: 1rem;
  }
}