/**
 * Reusable Components
 * Button, card, and other component styles
 * Requirements: 4.2, 2.6, 7.1, 7.4, 7.7
 */

/* ===== Button Component ===== */

/**
 * Base button styles
 * Requirement 4.2: Buttons with glassmorphism
 * Requirement 2.6: Minimum 44x44px touch target size
 * Requirement 7.1: Hover state feedback within 100ms
 * Requirement 7.4: CSS transitions for state changes
 * Requirement 7.7: Button click feedback
 */

/* Base button - shared styles for all buttons */
.btn {
  /* Layout & Sizing */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  padding: var(--spacing-md) var(--spacing-xl);
  
  /* Typography */
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-normal);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  
  /* Visual */
  border: none;
  border-radius: var(--radius-base);
  cursor: pointer;
  user-select: none;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  
  /* Transitions - Requirement 7.4 */
  transition: all var(--transition-base) var(--easing-default);
  
  /* Accessibility */
  -webkit-tap-highlight-color: transparent;
  --liquid-pointer-x: 50%;
  --liquid-pointer-y: 50%;
  --liquid-pointer-o: 0;
}

/* Remove default button styles */
.btn::-moz-focus-inner {
  border: 0;
  padding: 0;
}

/* Button text wrapper */
.btn__text {
  display: inline-block;
}

/* ===== Size Variants ===== */

/**
 * Small button - compact size for secondary actions
 * Still maintains minimum 44x44px touch target
 */
.btn--small {
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
}

/**
 * Medium button - default size (already defined in .btn)
 */
.btn--medium {
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
}

/**
 * Large button - prominent CTAs and hero section
 */
.btn--large {
  min-width: 120px;
  min-height: 56px;
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

/* ===== Color Variants ===== */

/**
 * Primary button - main call-to-action
 * Uses secondary-dark color from palette
 */
.btn--primary {
  background: var(--color-secondary-dark);
  color: var(--color-primary-light);
  border: 1px solid transparent;
}

/* Fallback for browsers without backdrop-filter */
.btn--primary.btn--glass {
  background: rgba(38, 38, 38, 0.9);
  border: 1px solid var(--glass-border);
  box-shadow: var(--liquid-shadow-soft);
}

/* Enhanced glassmorphism for supported browsers */
@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
  .btn--primary.btn--glass {
    background: linear-gradient(
      155deg,
      rgba(255, 255, 255, 0.16) 0%,
      var(--glass-bg-medium) 60%,
      rgba(168, 168, 168, 0.22) 100%
    );
    backdrop-filter: blur(var(--blur-lg)) saturate(125%);
    -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(125%);
  }
}

/* Primary button hover state - Requirement 7.1 */
.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
  .btn--primary.btn--glass:hover {
    background: rgba(38, 38, 38, 0.5);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  }
}

/* Primary button focus state */
.btn--primary:focus {
  outline: 2px solid var(--color-light-accent);
  outline-offset: 2px;
}

/* Primary button active state - Requirement 7.7 */
.btn--primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/**
 * Secondary button - alternative actions
 * Uses light-accent color from palette
 */
.btn--secondary {
  background: var(--color-light-accent);
  color: var(--color-primary-dark);
  border: 1px solid transparent;
}

/* Fallback for browsers without backdrop-filter */
.btn--secondary.btn--glass {
  background: rgba(168, 168, 168, 0.9);
  border: 1px solid var(--glass-border);
  box-shadow: var(--liquid-shadow-soft);
}

/* Enhanced glassmorphism for supported browsers */
@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
  .btn--secondary.btn--glass {
    background: linear-gradient(
      160deg,
      rgba(255, 255, 255, 0.2) 0%,
      rgba(168, 168, 168, 0.3) 55%,
      rgba(92, 92, 92, 0.28) 100%
    );
    backdrop-filter: blur(var(--blur-lg)) saturate(120%);
    -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(120%);
  }
}

.btn--glass::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      circle at var(--liquid-pointer-x) var(--liquid-pointer-y),
      rgba(255, 255, 255, calc(var(--liquid-pointer-o) * 1.2)) 0%,
      rgba(255, 255, 255, calc(var(--liquid-pointer-o) * 0.5)) 26%,
      rgba(255, 255, 255, 0) 60%
    ),
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.26) 0%,
      rgba(255, 255, 255, 0) 100%
    );
  opacity: calc(0.55 + var(--liquid-pointer-o));
  transition: opacity var(--transition-base) var(--easing-default);
  pointer-events: none;
}

.btn--glass:hover::before {
  opacity: calc(0.6 + var(--liquid-pointer-o));
}

.btn--glass::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid var(--liquid-edge);
  pointer-events: none;
}

.card--glass {
  --liquid-pointer-x: 50%;
  --liquid-pointer-y: 50%;
  --liquid-pointer-o: 0;
}

.card--glass::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      circle at var(--liquid-pointer-x) var(--liquid-pointer-y),
      rgba(255, 255, 255, calc(var(--liquid-pointer-o) * 0.9)) 0%,
      rgba(255, 255, 255, calc(var(--liquid-pointer-o) * 0.35)) 28%,
      rgba(255, 255, 255, 0) 64%
    ),
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.24) 0%,
      rgba(255, 255, 255, 0) 42%
    );
  pointer-events: none;
}

.card--glass::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid var(--liquid-edge);
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }

  .btn,
  .card--glass {
    --liquid-pointer-o: 0;
  }

  .btn--glass::before,
  .card--glass::before {
    transition: none;
  }
}

@media (pointer: coarse) {
  .btn,
  .card--glass {
    --liquid-pointer-o: 0;
  }
}

/* Secondary button hover state - Requirement 7.1 */
.btn--secondary:hover {
  background: var(--color-mid-tone);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
  .btn--secondary.btn--glass:hover {
    background: rgba(168, 168, 168, 0.5);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  }
}

/* Secondary button focus state */
.btn--secondary:focus {
  outline: 2px solid var(--color-secondary-dark);
  outline-offset: 2px;
}

/* Secondary button active state - Requirement 7.7 */
.btn--secondary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* ===== Button States ===== */

/**
 * Disabled button state
 */
.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/**
 * Loading button state (optional)
 */
.btn--loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn--loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  animation: btn-spin 0.6s linear infinite;
}

@keyframes btn-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== Button Groups ===== */

/**
 * Button group - for multiple buttons side by side
 */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}

/* ===== Accessibility & Performance ===== */

/**
 * Reduced motion support
 * Requirement 7.6: Respect user motion preferences
 */
@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
  
  .btn:hover,
  .btn:active {
    transform: none;
  }
  
  .btn--loading::after {
    animation: none;
    border-top-color: currentColor;
  }

  .btn--glass::before {
    transition: none;
  }
}

/**
 * High contrast mode support
 */
@media (prefers-contrast: high) {
  .btn {
    border: 2px solid currentColor;
  }
  
  .btn:focus {
    outline-width: 3px;
  }
}

/**
 * Responsive adjustments
 */
@media (max-width: 767px) {
  /* Ensure touch targets remain adequate on mobile */
  .btn {
    min-width: var(--touch-target-min);
    min-height: var(--touch-target-min);
  }
  
  /* Adjust large buttons for mobile */
  .btn--large {
    min-width: 100px;
    min-height: 52px;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
  }
}

/* ===== Card Component ===== */

/**
 * Base card styles with glassmorphism
 * Requirement 4.3: Cards with glassmorphism effects
 * Requirement 7.1: Hover effects with visual feedback
 */

/* Base card - shared styles for all cards */
.card {
  /* Layout */
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  
  /* Visual */
  background: var(--color-bg-light);
  border: 1px solid var(--color-mid-tone);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-base);
  
  /* Transitions - Requirement 7.4 */
  transition: transform var(--transition-base) var(--easing-default),
              box-shadow var(--transition-base) var(--easing-default);
}

/* ===== Glassmorphism Variant ===== */

/**
 * Glass card - card with glassmorphism effect
 * Requirement 4.3: Cards with glassmorphism
 * Requirement 4.6: Fallback for unsupported browsers
 */

/* Fallback for browsers without backdrop-filter support */
.card--glass {
  background: rgba(245, 245, 245, 0.95);
  border: 1px solid var(--glass-border);
  box-shadow: var(--liquid-shadow-soft);
  isolation: isolate;
}

/* Enhanced glassmorphism for supported browsers */
@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
  .card--glass {
    background: linear-gradient(
      155deg,
      rgba(255, 255, 255, 0.18) 0%,
      var(--glass-bg-light) 52%,
      rgba(255, 255, 255, 0.1) 100%
    );
    backdrop-filter: blur(var(--blur-lg)) saturate(130%);
    -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(130%);
  }
}


/* Dark glass variant - for use on light backgrounds */
.card--glass-dark {
  background: rgba(17, 17, 17, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-light);
}

@supports (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px)) {
  .card--glass-dark {
    background: rgba(17, 17, 17, 0.7);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
  }
}

/* ===== Card Hover Effects ===== */

/**
 * Card hover state - transform and shadow
 * Requirement 7.1: Hover state feedback within 100ms
 */
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--glass:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

/* Interactive card - for clickable cards */
.card--interactive {
  cursor: pointer;
  user-select: none;
}

.card--interactive:active {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ===== Card Structure Elements ===== */

/**
 * Card image container
 */
.card__image {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: var(--color-mid-tone);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-base) var(--easing-default);
}

/* Image zoom on card hover */
.card:hover .card__image img {
  transform: scale(1.05);
}

/**
 * Card content area
 */
.card__content {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--spacing-lg);
  gap: var(--spacing-md);
}

/**
 * Card header (optional)
 */
.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--glass-border);
}

/**
 * Card title
 */
.card__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

.card--glass-dark .card__title {
  color: var(--color-text-light);
}

/**
 * Card subtitle (optional)
 */
.card__subtitle {
  margin: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card--glass-dark .card__subtitle {
  color: var(--color-light-accent);
}

/**
 * Card description
 */
.card__description {
  margin: 0;
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

.card--glass-dark .card__description {
  color: var(--color-primary-light);
}

/**
 * Card footer (optional)
 */
.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
  margin-top: auto;
}

/**
 * Card tags/labels container
 */
.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: auto;
}

/**
 * Individual tag/label
 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  color: var(--color-text-primary);
  background: var(--color-light-accent);
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: background var(--transition-fast) var(--easing-default);
}

.tag:hover {
  background: var(--color-mid-tone);
}

/* Tag variant for glass cards */
.card--glass .tag,
.card--glass-dark .tag {
  background: rgba(168, 168, 168, 0.3);
  border: 1px solid var(--glass-border);
  color: var(--color-text-primary);
}

.card--glass-dark .tag {
  color: var(--color-text-light);
}

/* ===== Card Size Variants ===== */

/**
 * Small card - compact size
 */
.card--small .card__content {
  padding: var(--spacing-md);
  gap: var(--spacing-sm);
}

.card--small .card__title {
  font-size: var(--font-size-lg);
}

.card--small .card__description {
  font-size: var(--font-size-sm);
}

/**
 * Large card - prominent size
 */
.card--large .card__content {
  padding: var(--spacing-xl);
  gap: var(--spacing-lg);
}

.card--large .card__title {
  font-size: var(--font-size-2xl);
}

/* ===== Card Layout Variants ===== */

/**
 * Horizontal card - image and content side by side
 */
.card--horizontal {
  flex-direction: row;
}

.card--horizontal .card__image {
  width: 40%;
  min-height: 200px;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.card--horizontal .card__content {
  width: 60%;
}

/**
 * Centered card - center-aligned content
 */
.card--centered .card__content {
  align-items: center;
  text-align: center;
}

/* ===== Responsive Card Layouts ===== */

/**
 * Card grid container
 * Requirement 2.1, 2.2, 2.3: Responsive layouts
 */
.card-grid {
  display: grid;
  gap: var(--spacing-xl);
  width: 100%;
}

/* Mobile: Single column */
@media (max-width: 767px) {
  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  /* Horizontal cards stack on mobile */
  .card--horizontal {
    flex-direction: column;
  }
  
  .card--horizontal .card__image {
    width: 100%;
    min-height: 200px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }
  
  .card--horizontal .card__content {
    width: 100%;
  }
}

/* Tablet: Two columns */
@media (min-width: 768px) and (max-width: 1023px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  /* Allow single column variant on tablet */
  .card-grid--single {
    grid-template-columns: 1fr;
  }
}

/* Desktop: Three columns (default) */
@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
  }
  
  /* Two column variant */
  .card-grid--two {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Four column variant */
  .card-grid--four {
    grid-template-columns: repeat(4, 1fr);
  }
  
  /* Single column variant */
  .card-grid--single {
    grid-template-columns: 1fr;
    max-width: var(--container-md);
    margin: 0 auto;
  }
}

/* ===== Card States ===== */

/**
 * Loading card state
 */
.card--loading {
  pointer-events: none;
  opacity: 0.6;
}

.card--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 32px;
  height: 32px;
  margin-left: -16px;
  margin-top: -16px;
  border: 3px solid var(--color-mid-tone);
  border-radius: 50%;
  border-top-color: var(--color-secondary-dark);
  animation: card-spin 0.8s linear infinite;
}

@keyframes card-spin {
  to {
    transform: rotate(360deg);
  }
}

/**
 * Disabled card state
 */
.card--disabled {
  opacity: 0.5;
  pointer-events: none;
  cursor: not-allowed;
}

/**
 * Selected/Active card state
 */
.card--selected {
  border-color: var(--color-secondary-dark);
  border-width: 2px;
  box-shadow: 0 0 0 3px rgba(38, 38, 38, 0.2);
}

/* ===== Accessibility & Performance ===== */

/**
 * Reduced motion support
 * Requirement 7.6: Respect user motion preferences
 */
@media (prefers-reduced-motion: reduce) {
  .card,
  .card__image img,
  .tag {
    transition: none;
  }
  
  .card:hover,
  .card--interactive:active {
    transform: none;
  }
  
  .card:hover .card__image img {
    transform: none;
  }
  
  .card--loading::after {
    animation: none;
    border-top-color: var(--color-mid-tone);
  }
}

/**
 * High contrast mode support
 */
@media (prefers-contrast: high) {
  .card {
    border-width: 2px;
    border-color: currentColor;
  }
  
  .card--glass,
  .card--glass-dark {
    border-width: 2px;
  }
  
  .tag {
    border: 2px solid currentColor;
  }
}

/**
 * Focus styles for keyboard navigation
 * Requirement 10.5: Visible focus indicators
 */
.card--interactive:focus {
  outline: 2px solid var(--color-secondary-dark);
  outline-offset: 2px;
}

.card--interactive:focus:not(:focus-visible) {
  outline: none;
}

.card--interactive:focus-visible {
  outline: 2px solid var(--color-secondary-dark);
  outline-offset: 2px;
}