/**
 * Loading Component Styles
 * Loading overlays, spinners, and progress indicators
 *
 * @author Amit Haridas, ConcreteInfo
 */

/* ============================================
   LOADING OVERLAY
   ============================================ */
.loading-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 200ms ease, visibility 200ms ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-container {
    background-color: var(--bg-elevated, #ffffff);
    border-radius: var(--radius-xl, 0.75rem);
    box-shadow: var(--shadow-2xl, 0 25px 50px -12px rgba(0, 0, 0, 0.25));
    padding: var(--spacing-6, 1.5rem) var(--spacing-8, 2rem);
    min-width: 200px;
    text-align: center;
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4, 1rem);
}

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

/* Default spinner - rotating circle */
.loading-spinner {
    width: 40px;
    height: 40px;
    position: relative;
}

.loading-spinner::before {
    content: '';
    position: absolute;
    inset: 0;
    border: 3px solid var(--color-gray-200, #e5e7eb);
    border-radius: 50%;
}

.loading-spinner::after {
    content: '';
    position: absolute;
    inset: 0;
    border: 3px solid transparent;
    border-top-color: var(--color-brand);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Dots spinner */
.loading-spinner--dots {
    display: flex;
    gap: 6px;
    align-items: center;
    justify-content: center;
}

.loading-spinner--dots::before,
.loading-spinner--dots::after,
.loading-spinner--dots span {
    content: '';
    width: 8px;
    height: 8px;
    background-color: var(--color-brand);
    border-radius: 50%;
    animation: dots 1.4s infinite ease-in-out;
}

.loading-spinner--dots::before {
    animation-delay: -0.32s;
}

.loading-spinner--dots::after {
    animation-delay: -0.16s;
}

.loading-spinner--dots span {
    animation-delay: 0s;
}

/* Pulse spinner */
.loading-spinner--pulse {
    width: 40px;
    height: 40px;
    background-color: var(--color-brand);
    border-radius: 50%;
    animation: pulse 1.2s ease-in-out infinite;
}

/* ============================================
   LOADING MESSAGE
   ============================================ */
.loading-message {
    color: var(--text-secondary, #6b7280);
    font-size: var(--font-size-sm, 0.875rem);
    font-weight: var(--font-weight-medium, 500);
}

/* ============================================
   INLINE LOADING STATES
   ============================================ */
.is-loading {
    position: relative;
    pointer-events: none;
}

.is-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background-color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark .is-loading::after {
    background-color: rgba(0, 0, 0, 0.5);
}

/* Button loading state */
.btn.is-loading {
    color: transparent !important;
    pointer-events: none;
}

.btn.is-loading::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes dots {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(0.5); opacity: 0.5; }
    50% { transform: scale(1); opacity: 1; }
}

/* ============================================
   SKELETON LOADERS (for content placeholders)
   ============================================ */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-tertiary, #f3f4f6) 0%,
        var(--bg-secondary, #e5e7eb) 50%,
        var(--bg-tertiary, #f3f4f6) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-md, 0.5rem);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton--text {
    height: 1rem;
    margin-bottom: var(--spacing-2, 0.5rem);
}

.skeleton--title {
    height: 1.5rem;
    width: 60%;
    margin-bottom: var(--spacing-3, 0.75rem);
}

.skeleton--avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.skeleton--button {
    height: 40px;
    width: 100px;
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.progress-bar {
    width: 100%;
    height: 4px;
    background-color: var(--bg-tertiary, #f3f4f6);
    border-radius: var(--radius-full, 9999px);
    overflow: hidden;
}

.progress-bar__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-brand), var(--color-brand-light));
    border-radius: var(--radius-full, 9999px);
    transition: width 300ms ease;
}

/* Indeterminate progress */
.progress-bar--indeterminate .progress-bar__fill {
    width: 30%;
    animation: indeterminate 1.5s infinite ease-in-out;
}

@keyframes indeterminate {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(400%); }
}