:root {
  --md-sys-color-primary: #0061a4;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #d1e4ff;
  --md-sys-color-on-primary-container: #001d36;
  --md-sys-color-secondary: #535f70;
  --md-sys-color-on-secondary: #ffffff;
  --md-sys-color-secondary-container: #d7e3f7;
  --md-sys-color-on-secondary-container: #101c2b;
  --md-sys-color-surface: #fdfcff;
  --md-sys-color-on-surface: #1a1c1e;
  --md-sys-color-surface-variant: #dfe2eb;
  --md-sys-color-on-surface-variant: #43474e;
  --md-sys-color-outline: #73777f;
  --md-sys-color-outline-variant: #c3c7cf;
  --md-sys-color-error: #ba1a1a;
  --md-sys-color-on-error: #ffffff;
  --md-sys-color-background: #fdfcff;
  --md-sys-color-on-background: #1a1c1e;
  
  --nav-rail-width: 80px;
  --nav-rail-expanded-width: 280px;
  --nav-bar-height: 80px;
}

:root.dark {
  --md-sys-color-primary: #9ecaff;
  --md-sys-color-on-primary: #003258;
  --md-sys-color-primary-container: #00497d;
  --md-sys-color-on-primary-container: #d1e4ff;
  --md-sys-color-secondary: #bbc7db;
  --md-sys-color-on-secondary: #253140;
  --md-sys-color-secondary-container: #3b4858;
  --md-sys-color-on-secondary-container: #d7e3f7;
  --md-sys-color-surface: #1a1c1e;
  --md-sys-color-on-surface: #e2e2e6;
  --md-sys-color-surface-variant: #43474e;
  --md-sys-color-on-surface-variant: #c3c7cf;
  --md-sys-color-outline: #8d9199;
  --md-sys-color-outline-variant: #43474e;
  --md-sys-color-error: #ffb4ab;
  --md-sys-color-on-error: #690005;
  --md-sys-color-background: #1a1c1e;
  --md-sys-color-on-background: #e2e2e6;
}

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

body {
  font-family: 'Roboto', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
}

/* M3 Components */

.m3-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background-color: var(--md-sys-color-error);
  color: var(--md-sys-color-on-error);
  font-size: 10px;
  font-weight: 500;
  min-width: 16px;
  height: 16px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

.icon-button {
  width: 48px;
  height: 48px;
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--md-sys-color-on-surface-variant);
  transition: background-color 0.2s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.icon-button:hover {
  background-color: rgba(var(--md-sys-color-on-surface-variant-rgb, 67, 71, 78), 0.08);
}

.m3-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  height: 40px;
  border-radius: 20px;
  border: none;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.1px;
  transition: all 0.2s;
  background-color: transparent;
  color: var(--md-sys-color-primary);
  text-decoration: none;
  cursor: pointer;
}

.m3-button-filled {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.m3-button-filled:hover {
  box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

.m3-button-tonal {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.m3-button-outlined {
  border: 1px solid var(--md-sys-color-outline);
  color: var(--md-sys-color-primary);
}

.m3-card {
  background-color: var(--md-sys-color-surface-variant);
  color: var(--md-sys-color-on-surface-variant);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}

/* M3 FAB */

.m3-fab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  height: 56px;
  border-radius: 16px;
  border: none;
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  box-shadow: 0 3px 1px -2px rgba(0,0,0,.2), 0 2px 2px 0 rgba(0,0,0,.14), 0 1px 5px 0 rgba(0,0,0,.12);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.m3-fab:hover {
  box-shadow: 0 2px 4px -1px rgba(0,0,0,.2), 0 4px 5px 0 rgba(0,0,0,.14), 0 1px 10px 0 rgba(0,0,0,.12);
}

.m3-fab.extended {
  padding: 0 16px;
  width: auto;
  gap: 12px;
}

.m3-fab-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.m3-fab-label {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
}

.m3-fab-state-layer {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--md-sys-color-on-primary-container);
  opacity: 0;
  transition: opacity 0.2s;
}

.m3-fab:hover .m3-fab-state-layer {
  opacity: 0.08;
}

/* M3 Filled Text Field */

.m3-text-field-container {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
  width: 100%;
}

.m3-text-field-field {
  position: relative;
  height: 56px;
  background-color: var(--md-sys-color-surface-variant);
  border-radius: 4px 4px 0 0;
  overflow: hidden;
}

.m3-text-field-input {
  width: 100%;
  height: 100%;
  padding: 24px 16px 8px;
  border: none;
  background: transparent;
  color: var(--md-sys-color-on-surface);
  font-size: 16px;
  outline: none;
  z-index: 1;
}

.m3-text-field-label {
  position: absolute;
  left: 16px;
  top: 16px;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 16px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  z-index: 2;
}

.m3-text-field-container.focused .m3-text-field-label,
.m3-text-field-container.filled .m3-text-field-label {
  top: 8px;
  font-size: 12px;
  color: var(--md-sys-color-primary);
}

.m3-text-field-active-indicator {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--md-sys-color-on-surface-variant);
  transition: height 0.2s, background-color 0.2s;
}

.m3-text-field-container.focused .m3-text-field-active-indicator {
  height: 2px;
  background-color: var(--md-sys-color-primary);
}

.m3-text-field-state-layer {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--md-sys-color-on-surface);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

.m3-text-field-field:hover .m3-text-field-state-layer {
  opacity: 0.08;
}

.m3-text-field-container.error .m3-text-field-label,
.m3-text-field-container.error .m3-text-field-active-indicator {
  color: var(--md-sys-color-error);
  background-color: var(--md-sys-color-error);
}

.m3-text-field-supporting-text {
  font-size: 12px;
  padding: 4px 16px 0;
  color: var(--md-sys-color-on-surface-variant);
}

.m3-text-field-container.error .m3-text-field-supporting-text {
  color: var(--md-sys-color-error);
}

/* Layout */

.app-container {
  display: flex;
  min-height: 100vh;
}

.main-content {
  flex: 1;
  padding: 16px;
}

/* Navigation Bar (Mobile) */

.navigation-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--nav-bar-height);
  background-color: var(--md-sys-color-surface-variant);
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 0 8px;
  z-index: 100;
  transition: transform 0.2s ease-in-out;
}

.navigation-bar.hidden {
  transform: translateY(100%);
}

.mobile-fab-container {
  position: fixed;
  right: 16px;
  bottom: calc(var(--nav-bar-height) + 16px);
  z-index: 99;
  transition: transform 0.2s ease-in-out, opacity 0.2s;
}

.mobile-fab-container.hidden {
  transform: translateY(calc(var(--nav-bar-height) + 16px));
  opacity: 0;
}

@media (min-width: 600px) {
  .navigation-bar { display: none; }
  .main-content { margin-left: var(--nav-rail-width); }
}

@media (min-width: 1240px) {
  .main-content.with-expanded-rail { margin-left: var(--nav-rail-expanded-width); }
}

@media (max-width: 599px) {
  .main-content { padding-bottom: calc(var(--nav-bar-height) + 16px); }
}

/* Navigation Rail (Tablet/Desktop) */

.navigation-rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--nav-rail-width);
  background-color: var(--md-sys-color-surface);
  display: flex;
  flex-direction: column;
  padding: 16px 0;
  border-right: 1px solid var(--md-sys-color-outline-variant);
  z-index: 100;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-x: hidden;
}

.navigation-rail.expanded {
  width: var(--nav-rail-expanded-width);
}

.rail-header {
  display: flex;
  align-items: center;
  padding: 0 16px;
  height: 56px;
  gap: 12px;
  margin-bottom: 8px;
}

.rail-title {
  font-size: 20px;
  font-weight: 500;
  white-space: nowrap;
}

.user-info {
  display: flex;
  align-items: center;
  padding: 16px;
  gap: 12px;
  margin-bottom: 8px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 20px;
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  flex-shrink: 0;
}

.user-details {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.user-name {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-group {
  font-size: 12px;
  opacity: 0.7;
}

.rail-items {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Nav Items Shared */

.nav-item {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--md-sys-color-on-surface-variant);
  height: 56px;
  padding: 0 12px;
  position: relative;
  transition: background-color 0.2s;
}

.navigation-bar .nav-item {
  flex-direction: column;
  justify-content: center;
  flex: 1;
  gap: 4px;
  padding: 0;
}

.nav-item-icon-wrapper {
  width: 64px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  transition: background-color 0.2s;
  position: relative;
}

.nav-item.active .nav-item-icon-wrapper {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.nav-item-label {
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}

.navigation-rail.expanded .nav-item {
  height: 56px;
  border-radius: 28px;
  margin: 0 12px;
}

.navigation-rail.expanded .nav-item-label {
  font-size: 14px;
  margin-left: 12px;
  flex: 1;
}

/* Submenu */

.submenu {
  display: flex;
  flex-direction: column;
  padding-left: 56px;
  margin-bottom: 8px;
}

.submenu-item {
  height: 48px;
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 14px;
  border-radius: 24px;
  margin: 0 12px;
  padding: 0 16px;
}

.submenu-item.active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.submenu-arrow {
  margin-right: 8px;
}