/* components/loading/loading.css */

/**
 * Loading Component
Full accessibility support
 * Complete loading/spinner system with multiple variants
 */

/* ========================================
   LOADING CUSTOM PROPERTIES
   ======================================== */

.c-loading {
  /* Base properties */
  --c-loading-font-family: var(--ds-font-family-sans);
  --c-loading-font-weight: var(--ds-font-weight-medium);
  --c-loading-transition: opacity var(--ds-duration-normal) var(--ds-ease-out);
  
  /* Size-specific properties (default to medium) */
  --c-loading-size: 3rem; /* 48px */
  --c-loading-stroke-width: 4;
  --c-loading-font-size: var(--ds-font-size-s);
  --c-loading-gap: var(--ds-space-m);
  
  /* Colors */
  --c-loading-color-primary: var(--ds-color-accent);
  --c-loading-color-track: var(--ds-color-border);
  --c-loading-color-text: var(--ds-color-text-weak);
  
  /* Animation */
  --c-loading-animation-duration: 1.4s;
  --c-loading-animation-timing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   BASE LOADING STYLES
   ======================================== */

.c-loading {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--c-loading-gap);
  position: relative;
  isolation: isolate;
}

/* Spinner container */
.c-loading__spinner {
  width: var(--c-loading-size);
  height: var(--c-loading-size);
  position: relative;
  color: var(--c-loading-color-primary);
}

/* SVG element */
.c-loading__svg {
  width: 100%;
  height: 100%;
  animation: c-loading-rotate var(--c-loading-animation-duration) var(--c-loading-animation-timing) infinite;
}

/* Text label */
.c-loading__text {
  font-family: var(--c-loading-font-family);
  font-size: var(--c-loading-font-size);
  font-weight: var(--c-loading-font-weight);
  color: var(--c-loading-color-text);
  line-height: var(--ds-line-height-s);
  margin: 0;
  text-align: center;
}

/* ========================================
   SIZE VARIANTS
   ======================================== */

/* Extra Small (xs) - matches button xs */
.c-loading--size-xs {
  --c-loading-size: 1.75rem; /* 28px */
  --c-loading-stroke-width: 3;
  --c-loading-font-size: var(--ds-font-size-xs);
  --c-loading-gap: var(--ds-space-xs);
}

/* Small (s) - matches button s */
.c-loading--size-s {
  --c-loading-size: 2rem; /* 32px */
  --c-loading-stroke-width: 3;
  --c-loading-font-size: var(--ds-font-size-xs);
  --c-loading-gap: var(--ds-space-s);
}

/* Medium (m) - default - matches button m */
.c-loading--size-m {
  --c-loading-size: 3rem; /* 48px */
  --c-loading-stroke-width: 4;
  --c-loading-font-size: var(--ds-font-size-s);
  --c-loading-gap: var(--ds-space-m);
}

/* Large (l) - matches button l */
.c-loading--size-l {
  --c-loading-size: 3.5rem; /* 56px */
  --c-loading-stroke-width: 4;
  --c-loading-font-size: var(--ds-font-size-m);
  --c-loading-gap: var(--ds-space-m);
}

/* Extra Large (xl) - matches button xl */
.c-loading--size-xl {
  --c-loading-size: 4rem; /* 64px */
  --c-loading-stroke-width: 5;
  --c-loading-font-size: var(--ds-font-size-l);
  --c-loading-gap: var(--ds-space-l);
}

/* XXL - extra size */
.c-loading--size-xxl {
  --c-loading-size: 5rem; /* 80px */
  --c-loading-stroke-width: 5;
  --c-loading-font-size: var(--ds-font-size-l);
  --c-loading-gap: var(--ds-space-l);
}

/* XXXL - extra size */
.c-loading--size-xxxl {
  --c-loading-size: 6rem; /* 96px */
  --c-loading-stroke-width: 6;
  --c-loading-font-size: var(--ds-font-size-xl);
  --c-loading-gap: var(--ds-space-xl);
}

/* ========================================
   VARIANT: LINE SIMPLE
   ======================================== */

.c-loading--line-simple .c-loading__track {
  cx: 16;
  cy: 16;
  r: 14;
  fill: none;
  stroke: var(--c-loading-color-track);
  stroke-width: var(--c-loading-stroke-width);
}

.c-loading--line-simple .c-loading__progress {
  cx: 16;
  cy: 16;
  r: 14;
  fill: none;
  stroke: var(--c-loading-color-primary);
  stroke-width: var(--c-loading-stroke-width);
  stroke-dasharray: 100;
  stroke-dashoffset: 75;
  stroke-linecap: round;
  transform-origin: center;
}

/* ========================================
   VARIANT: LINE SPINNER
   ======================================== */

.c-loading--line-spinner .c-loading__progress {
  cx: 16;
  cy: 16;
  r: 14;
  fill: none;
  stroke: var(--c-loading-color-primary);
  stroke-width: var(--c-loading-stroke-width);
  stroke-dasharray: 100;
  stroke-dashoffset: 40;
  stroke-linecap: round;
  transform-origin: center;
}

/* ========================================
   VARIANT: DOT CIRCLE
   ======================================== */

.c-loading--dots .c-loading__svg {
  animation: c-loading-rotate var(--c-loading-animation-duration) linear infinite;
}

.c-loading--dots .c-loading__path-1 {
  fill: none;
  stroke: url(#c-loading-gradient-1);
  stroke-width: var(--c-loading-stroke-width);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 0.1 8;
}

.c-loading--dots .c-loading__path-2 {
  fill: none;
  stroke: url(#c-loading-gradient-2);
  stroke-width: var(--c-loading-stroke-width);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 0.1 8;
}

/* Gradient definitions are inline in SVG */

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes c-loading-rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Pulse animation for text */
@keyframes c-loading-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.c-loading__text--animated {
  animation: c-loading-pulse 1.5s var(--c-loading-animation-timing) infinite;
}

/* ========================================
   COLOR VARIANTS
   ======================================== */

.c-loading--primary {
  --c-loading-color-primary: var(--ds-color-accent);
}

.c-loading--success {
  --c-loading-color-primary: var(--ds-color-status-success);
}

.c-loading--warning {
  --c-loading-color-primary: var(--ds-color-status-warning);
}

.c-loading--danger {
  --c-loading-color-primary: var(--ds-color-status-danger);
}

.c-loading--info {
  --c-loading-color-primary: var(--ds-color-status-info);
}

.c-loading--neutral {
  --c-loading-color-primary: var(--ds-color-text-weak);
}

/* ========================================
   LAYOUT VARIANTS
   ======================================== */

/* Inline loading (horizontal layout) */
.c-loading--inline {
  flex-direction: row;
  align-items: center;
}

.c-loading--inline .c-loading__text {
  margin: 0;
}

/* Overlay loading */
.c-loading--overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--ds-color-overlay);
  z-index: var(--ds-z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Centered in container */
.c-loading--centered {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Full page loading */
.c-loading--fullpage {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: var(--ds-z-modal);
}

/* ========================================
   LOADING CONTAINER
   ======================================== */

.c-loading-container {
  position: relative;
  min-height: 100px;
}

.c-loading-container--loading {
  pointer-events: none;
  user-select: none;
}

.c-loading-container--loading > *:not(.c-loading) {
  opacity: 0.3;
  filter: blur(1px);
  transition: opacity var(--ds-duration-normal) var(--ds-ease-out),
              filter var(--ds-duration-normal) var(--ds-ease-out);
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Screen reader only text */
.c-loading__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;
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .c-loading__track {
    stroke: Canvas;
    stroke-opacity: 0.3;
  }
  
  .c-loading__progress {
    stroke: LinkText;
  }
  
  .c-loading__text {
    color: CanvasText;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .c-loading__svg {
    animation-duration: 3s;
  }
  
  .c-loading__text--animated {
    animation: none;
  }
}

/* Print styles */
@media print {
  .c-loading {
    display: none;
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* Hide loading */
.c-loading--hidden {
  display: none;
}

/* Loading with backdrop */
.c-loading-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--ds-z-modal-backdrop);
  backdrop-filter: blur(2px);
}

/* Small inline loading for buttons/inputs */
.c-loading--button {
  --c-loading-size: 1em;
  --c-loading-stroke-width: 2;
  display: inline-block;
  vertical-align: middle;
  margin: 0 0.25em;
}