/* css/layout.css */
/* Material Design 3 Enterprise - AppShell, Sidebar, TopBar */

:root {
  --sidebar-width: 280px;
  --topbar-height: 64px;
}

/* ========================================================================
   APP SHELL
   ======================================================================== */
.app {
  display: flex;
  min-height: 100vh;
  width: 100%;
  background-color: var(--md-sys-color-background);
  position: relative;
  overflow: hidden;
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  margin-left: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  background-color: var(--md-sys-color-background);
}

.content {
  padding: var(--md-sys-spacing-6); /* 24px padding */
  flex: 1;
  max-width: 1600px; /* Enterprise wide-screen optimization */
  margin: 0 auto;
  width: 100%;
  padding-bottom: var(--md-sys-spacing-12);
}

/* ========================================================================
   VIEWS (SPA Routing Simulation)
   ======================================================================== */
.view {
  display: none;
  animation: md-fade-in var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.view.active {
  display: block;
}

@keyframes md-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================================================
   SIDEBAR (Google Workspace Style)
   ======================================================================== */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--md-sys-color-surface-container); /* MD3 Standard for standard drawers */
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: var(--md-sys-zindex-drawer);
  transition: transform var(--md-sys-motion-duration-long) var(--md-sys-motion-easing-standard);
  border-right: none; /* MD3 relies on color separation or soft borders */
}

/* Brand / Logo Area */
.brand {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: var(--md-sys-spacing-3);
  padding: 0 var(--md-sys-spacing-4) 0 var(--md-sys-spacing-6);
  margin-bottom: var(--md-sys-spacing-4);
  flex-shrink: 0;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  border-radius: var(--md-sys-shape-corner-button); /* 18px rounded */
  display: flex;
  align-items: center;
  justify-content: center;
  font: var(--md-sys-typescale-title-medium);
  font-weight: 700;
}

.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand-text strong {
  font: var(--md-sys-typescale-title-medium);
  color: var(--md-sys-color-on-surface);
  line-height: 1.2;
}

.brand-text span {
  font: var(--md-sys-typescale-label-small);
  color: var(--md-sys-color-primary);
  letter-spacing: 0.5px;
}

/* Navigation List */
.nav {
  display: flex;
  flex-direction: column;
  gap: var(--md-sys-spacing-1); /* 4px gap between items */
  padding: 0 var(--md-sys-spacing-3); /* 12px padding on sides */
  flex: 1;
  overflow-y: auto;
}

/* Nav Item (Workspace Capsule Style) */
.nav-item {
  display: flex;
  align-items: center;
  gap: var(--md-sys-spacing-3);
  height: 48px;
  padding: 0 var(--md-sys-spacing-4);
  border-radius: var(--md-sys-shape-corner-full); /* Fully rounded capsule */
  color: var(--md-sys-color-on-surface-variant);
  font: var(--md-sys-typescale-label-large);
  text-align: left;
  transition: background-color var(--md-sys-motion-duration-short) linear,
              color var(--md-sys-motion-duration-short) linear;
  position: relative;
  overflow: hidden;
  user-select: none;
}

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

.nav-item:active {
  background-color: var(--md-sys-state-pressed);
}

/* Active Nav Item */
.nav-item.active {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font-weight: 600; /* Bold for active state in Workspace */
}

/* Nav Icon (Material Symbols) */
.nav-icon {
  font-size: 24px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Material Symbols properties applied in components.css or HTML, but sizing here */
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  transition: font-variation-settings var(--md-sys-motion-duration-short) linear;
}

.nav-item.active .nav-icon {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* Badges in Nav */
.nav-badge,
.count-badge {
  margin-left: auto;
  font: var(--md-sys-typescale-label-small);
  height: 24px;
  min-width: 24px;
  padding: 0 var(--md-sys-spacing-2);
  border-radius: var(--md-sys-shape-corner-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface-variant);
  font-weight: 600;
}

.nav-item.active .nav-badge,
.nav-item.active .count-badge {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--md-sys-spacing-4) var(--md-sys-spacing-6);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  margin-top: auto;
}

.lang-toggle {
  display: flex;
  gap: var(--md-sys-spacing-2);
  margin-bottom: var(--md-sys-spacing-3);
  background-color: var(--md-sys-color-surface-container-high);
  border-radius: var(--md-sys-shape-corner-full);
  padding: var(--md-sys-spacing-1);
}

.lang-btn {
  flex: 1;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-full);
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--md-sys-motion-duration-short);
}

.lang-btn.active {
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  box-shadow: var(--md-sys-elevation-level1);
}

.sidebar-footer .hint {
  font: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}

/* ========================================================================
   TOPBAR (Chrome / Workspace Settings Style)
   ======================================================================== */
.topbar {
  height: var(--topbar-height);
  background-color: var(--md-sys-color-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--md-sys-spacing-6);
  position: sticky;
  top: 0;
  z-index: var(--md-sys-zindex-sticky);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  /* Optional: Soft elevation for scrolling */
  transition: box-shadow var(--md-sys-motion-duration-short);
}

/* Menu Toggle (Mobile) */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--md-sys-shape-corner-full);
  color: var(--md-sys-color-on-surface-variant);
  align-items: center;
  justify-content: center;
  margin-right: var(--md-sys-spacing-3);
}

.menu-toggle:hover {
  background-color: var(--md-sys-state-hover);
}

.topbar-title {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0; /* Text truncation support */
}

.topbar-title h1 {
  font: var(--md-sys-typescale-title-large);
  color: var(--md-sys-color-on-surface);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-title p {
  font: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
  margin-top: 2px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--md-sys-spacing-2);
}

/* ========================================================================
   RESPONSIVE (Mobile Drawer Behavior)
   ======================================================================== */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--md-sys-elevation-level3);
    border-right: none;
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main {
    margin-left: 0;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .topbar {
    padding: 0 var(--md-sys-spacing-4);
  }
  
  .content {
    padding: var(--md-sys-spacing-4);
  }
}