/* ===================================================================
   MATERIAL DESIGN 3 (M3) COMPONENTS
   Refactored for Production Readiness & Crisp White Theme
   =================================================================== */

/* Accessibility: Skip Link & Screen Reader Utilities */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1.5rem;
  background-color: var(--md-sys-color-primary);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border-radius: var(--md-shape-corner-medium);
  font-weight: 600;
  font-size: 0.9375rem;
  z-index: 9999;
  transition: top var(--md-motion-duration-short);
  text-decoration: none;
  box-shadow: var(--md-elevation-level3);
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--md-sys-color-tertiary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Accessible Focus Rings */
:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

/* Top App Bar */
.md-app-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background-color: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: box-shadow var(--md-motion-duration-medium) var(--md-motion-easing-standard),
              background-color var(--md-motion-duration-medium) var(--md-motion-easing-standard);
}

.md-app-bar.scrolled {
  box-shadow: var(--md-elevation-level2);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
}

.brand-logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--md-shape-corner-medium);
  background: linear-gradient(135deg, var(--md-sys-color-primary), #0284c7);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 10px var(--badge-glow);
}

.brand-name {
  font-family: var(--font-family-brand);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--md-sys-color-on-surface);
}

.brand-name span {
  color: var(--md-sys-color-tertiary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  text-decoration: none;
  color: var(--md-sys-color-on-surface-variant);
  font-family: var(--font-family-body);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.5rem 0.95rem;
  border-radius: var(--md-shape-corner-full);
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

.nav-link:hover, .nav-link.active {
  color: var(--md-sys-color-primary);
  background-color: var(--md-sys-color-surface-container);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Mobile Hamburger Toggle */
.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--md-shape-corner-medium);
  background: transparent;
  border: 1px solid var(--md-sys-color-outline);
  color: var(--md-sys-color-on-surface);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--md-motion-duration-short);
}

.mobile-menu-btn:hover {
  background-color: var(--md-sys-color-surface-container);
}

/* Mobile Navigation Drawer */
.mobile-drawer-scrim {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-motion-duration-medium) var(--md-motion-easing-standard);
}

.mobile-drawer-scrim.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  max-width: 85vw;
  background-color: var(--md-sys-color-surface);
  box-shadow: var(--md-elevation-level5);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
  z-index: 201;
  border-left: 1px solid var(--md-sys-color-outline);
}

.mobile-drawer-scrim.open .mobile-drawer {
  transform: translateX(0);
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--md-sys-color-outline);
}

.mobile-drawer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-drawer-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: var(--md-shape-corner-medium);
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
  font-family: var(--font-family-brand);
  font-size: 1rem;
  font-weight: 600;
  transition: background-color var(--md-motion-duration-short);
}

.mobile-drawer-link:hover {
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-primary);
}

/* Material 3 Buttons */
.md-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0 1.5rem;
  height: 44px;
  border-radius: var(--md-shape-corner-full);
  font-family: var(--font-family-brand);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  border: none;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
  position: relative;
  overflow: hidden;
  user-select: none;
  white-space: nowrap;
}

.md-btn:active {
  transform: scale(0.98);
}

.md-btn-filled {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  box-shadow: var(--md-elevation-level1);
}

.md-btn-filled:hover {
  box-shadow: var(--md-elevation-level2);
  filter: brightness(1.08);
}

.md-btn-warm {
  background: linear-gradient(135deg, var(--md-sys-color-tertiary), #b45309);
  color: var(--md-sys-color-on-tertiary);
  box-shadow: var(--md-elevation-level1);
}

.md-btn-warm:hover {
  box-shadow: var(--md-elevation-level2);
  filter: brightness(1.1);
}

.md-btn-tonal {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.md-btn-tonal:hover {
  background-color: color-mix(in srgb, var(--md-sys-color-primary-container) 85%, var(--md-sys-color-primary));
}

.md-btn-outlined {
  background-color: transparent;
  color: var(--md-sys-color-primary);
  border: 1.5px solid var(--md-sys-color-outline);
}

.md-btn-outlined:hover {
  background-color: var(--md-sys-color-surface-container);
  border-color: var(--md-sys-color-primary);
}

.md-btn-text {
  background: transparent;
  color: var(--md-sys-color-primary);
  padding: 0 1rem;
}

.md-btn-text:hover {
  background-color: var(--md-sys-color-surface-container);
}

.md-icon-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--md-shape-corner-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--md-sys-color-outline);
  color: var(--md-sys-color-on-surface);
  cursor: pointer;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

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

/* Material Chips */
.md-chip-group {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.md-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  height: 38px;
  padding: 0 1.15rem;
  border-radius: var(--md-shape-corner-full);
  border: 1px solid var(--md-sys-color-outline);
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface-variant);
  font-family: var(--font-family-body);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
  user-select: none;
}

.md-chip:hover {
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  border-color: var(--md-sys-color-primary);
}

.md-chip.active {
  background-color: var(--md-sys-color-primary);
  color: #ffffff;
  border-color: var(--md-sys-color-primary);
  font-weight: 600;
  box-shadow: var(--md-elevation-level1);
}

.md-chip .material-symbols-outlined {
  font-size: 1.125rem;
}

/* Material Badges & Tags */
.md-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--md-shape-corner-full);
  font-family: var(--font-family-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.md-badge-tonal {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-primary);
  border: 1px solid rgba(29, 78, 216, 0.15);
}

.md-badge-warm {
  background-color: var(--md-sys-color-tertiary-container);
  color: var(--md-sys-color-tertiary);
  border: 1px solid rgba(217, 119, 6, 0.2);
}

.md-badge-teal {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-secondary);
  border: 1px solid rgba(15, 118, 110, 0.2);
}

/* Material 3 Cards (Clean White Theme & Nocturne) */
.md-card {
  border-radius: var(--md-shape-corner-large);
  transition: transform var(--md-motion-duration-medium) var(--md-motion-easing-emphasized),
              box-shadow var(--md-motion-duration-medium) var(--md-motion-easing-emphasized),
              border-color var(--md-motion-duration-medium) var(--md-motion-easing-standard);
  position: relative;
  overflow: hidden;
  background-color: var(--md-sys-color-surface);
}

.md-card-elevated {
  box-shadow: var(--md-elevation-level1);
  border: 1px solid var(--md-sys-color-outline);
}

.md-card-elevated:hover {
  transform: translateY(-4px);
  box-shadow: var(--md-elevation-level3);
  border-color: var(--md-sys-color-primary);
}

.md-card-outlined {
  border: 1px solid var(--md-sys-color-outline);
  background-color: var(--md-sys-color-surface);
}

.md-card-outlined:hover {
  border-color: var(--md-sys-color-primary);
  box-shadow: var(--md-elevation-level2);
}

/* Material Text Fields & Form Controls */
.md-text-field {
  position: relative;
  margin-bottom: 1.25rem;
  width: 100%;
}

.md-input, .md-textarea, .md-select {
  width: 100%;
  padding: 1.1rem 1rem 0.6rem 1rem;
  border: 1.5px solid var(--md-sys-color-outline);
  border-radius: var(--md-shape-corner-medium);
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  font-family: var(--font-family-body);
  font-size: 0.9375rem;
  outline: none;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
  box-sizing: border-box;
}

.md-input:focus, .md-textarea:focus, .md-select:focus {
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 0 0 3px var(--badge-glow);
}

.md-floating-label {
  position: absolute;
  left: 1rem;
  top: 0.95rem;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.875rem;
  pointer-events: none;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
  background-color: transparent;
}

.md-input:focus ~ .md-floating-label,
.md-input:not(:placeholder-shown) ~ .md-floating-label,
.md-textarea:focus ~ .md-floating-label,
.md-textarea:not(:placeholder-shown) ~ .md-floating-label,
.md-select:focus ~ .md-floating-label,
.md-select:valid ~ .md-floating-label {
  top: -0.55rem;
  left: 0.75rem;
  font-size: 0.75rem;
  padding: 0 0.35rem;
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-primary);
  font-weight: 600;
}

/* Material Dialog / Modal */
.md-dialog-scrim {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-motion-duration-medium) var(--md-motion-easing-standard);
}

.md-dialog-scrim.open {
  opacity: 1;
  pointer-events: auto;
}

.md-dialog {
  background-color: var(--md-sys-color-surface);
  border-radius: var(--md-shape-corner-extra-large);
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--md-elevation-level5);
  border: 1px solid var(--md-sys-color-outline);
  transform: scale(0.94);
  transition: transform var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
  padding: 2.25rem;
  position: relative;
}

.md-dialog-scrim.open .md-dialog {
  transform: scale(1);
}

.md-dialog-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--md-sys-color-on-surface-variant);
  width: 36px;
  height: 36px;
  border-radius: var(--md-shape-corner-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

.md-dialog-close:hover {
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
}

/* Material Accordion */
.md-accordion-item {
  border: 1px solid var(--md-sys-color-outline);
  border-radius: var(--md-shape-corner-medium);
  margin-bottom: 0.85rem;
  background-color: var(--md-sys-color-surface);
  overflow: hidden;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

.md-accordion-item.open {
  border-color: var(--md-sys-color-primary);
  box-shadow: var(--md-elevation-level1);
}

.md-accordion-header {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: none;
  text-align: left;
  font-family: var(--font-family-brand);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--md-sys-color-on-surface);
  cursor: pointer;
}

.md-accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--md-motion-duration-medium) var(--md-motion-easing-standard);
  padding: 0 1.5rem;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.md-accordion-item.open .md-accordion-content {
  max-height: 400px;
  padding-bottom: 1.25rem;
}

.md-accordion-item .chevron {
  transition: transform var(--md-motion-duration-medium) var(--md-motion-easing-standard);
}

.md-accordion-item.open .chevron {
  transform: rotate(180deg);
  color: var(--md-sys-color-primary);
}

/* Extended Floating Action Button (FAB) */
.md-fab-extended {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0 1.5rem;
  height: 54px;
  border-radius: var(--md-shape-corner-full);
  background: linear-gradient(135deg, var(--md-sys-color-tertiary), #b45309);
  color: #ffffff;
  font-family: var(--font-family-brand);
  font-weight: 700;
  font-size: 0.9375rem;
  box-shadow: var(--md-elevation-level3);
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all var(--md-motion-duration-short) var(--md-motion-easing-emphasized);
}

.md-fab-extended:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--md-elevation-level4);
  filter: brightness(1.1);
}

/* Material Snackbar */
.md-snackbar {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--md-sys-color-on-surface);
  color: var(--md-sys-color-surface);
  padding: 0.9rem 1.75rem;
  border-radius: var(--md-shape-corner-full);
  box-shadow: var(--md-elevation-level4);
  font-family: var(--font-family-body);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 1000;
  opacity: 0;
  transition: all var(--md-motion-duration-medium) var(--md-motion-easing-emphasized);
  pointer-events: none;
}

.md-snackbar.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* Material Sliders */
.md-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--md-sys-color-surface-container-high);
  border-radius: var(--md-shape-corner-full);
  outline: none;
  margin: 1.25rem 0;
}

.md-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--md-sys-color-primary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
  transition: transform var(--md-motion-duration-short);
}

.md-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}