/**
 * Loading States CSS - Polished Edition
 * Consistent styling for loading, error, skeleton, and empty states
 *
 * SPINNER GUIDE:
 * - .loading-spinner: Use for inline spinners, buttons, form fields, cards
 * - .spinner-container (spinner.css): Use for full-page loading states
 *
 * Features:
 * - Unified spinner sizes (sm: 16px, md: 32px, lg: 48px, xl: 64px)
 * - Smooth transitions between states
 * - Theme-aware colors
 * - Accessibility support (reduced motion, high contrast)
 * - Progress bar indicators
 * - Toast-style notifications
 * - Global timing variables (--transition-micro through --transition-sluggish)
 * - Standard easing curves (--ease-standard, --ease-bounce, etc.)
 */

/* ============================================
   CSS CUSTOM PROPERTIES
   ============================================ */

:root {
    /* Colors */
    --loading-color-primary: var(--color-primary, #8b7fff);
    --loading-color-secondary: var(--color-secondary, #ff7fcc);
    --loading-color-bg: rgba(var(--color-bg-card-rgb, 26, 31, 58), 0.9);
    --loading-color-text: var(--color-text-secondary, #9ca3af);
    --loading-color-text-bright: var(--color-text-primary, #e5e7eb);
    --loading-color-error: #ef4444;
    --loading-color-success: #22c55e;
    --loading-color-warning: #f59e0b;

    /* Timing - for all transitions and animations */
    --loading-transition-fast: 150ms;
    --loading-transition-normal: 300ms;
    --loading-transition-slow: 450ms;

    /* Interaction timing (expose globally for consistent UX) */
    --transition-micro: 100ms;       /* Hover states, small feedback */
    --transition-fast: 150ms;        /* Buttons, toggles */
    --transition-normal: 250ms;      /* Standard interactions */
    --transition-slow: 350ms;        /* Page transitions, modals */
    --transition-sluggish: 500ms;    /* Large animations */

    /* Easing curves (Material Design inspired) */
    --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-decelerate: cubic-bezier(0, 0, 0.2, 1);
    --ease-accelerate: cubic-bezier(0.4, 0, 1, 1);
    --ease-sharp: cubic-bezier(0.4, 0, 0.6, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Spinner sizes */
    --loading-spinner-sm: 16px;
    --loading-spinner-md: 32px;
    --loading-spinner-lg: 48px;
    --loading-spinner-xl: 64px;
}

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

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    min-height: 200px;
    animation: fadeIn var(--loading-transition-normal) ease-out;
}

.loading-state--inline {
    flex-direction: row;
    padding: 1rem;
    gap: 1rem;
    min-height: auto;
}

.loading-state--compact {
    padding: 2rem 1rem;
    min-height: 120px;
}

.loading-state--fullscreen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* ============================================
   UNIFIED SPINNER SYSTEM
   ============================================ */

.loading-spinner {
    width: var(--loading-spinner-lg);
    height: var(--loading-spinner-lg);
    border: 4px solid rgba(var(--color-primary-rgb, 139, 127, 255), 0.15);
    border-top-color: var(--loading-color-primary);
    border-right-color: rgba(var(--color-primary-rgb, 139, 127, 255), 0.5);
    border-radius: 50%;
    animation: spinner-rotate 0.75s linear infinite;
    box-shadow: 0 0 16px rgba(var(--color-primary-rgb, 139, 127, 255), 0.35);
    flex-shrink: 0;
}

/* Spinner Sizes */
.loading-spinner--sm,
.spinner-sm {
    width: var(--loading-spinner-sm);
    height: var(--loading-spinner-sm);
    border-width: 2px;
    box-shadow: 0 0 8px rgba(var(--color-primary-rgb, 139, 127, 255), 0.25);
}

.loading-spinner--md,
.spinner-md {
    width: var(--loading-spinner-md);
    height: var(--loading-spinner-md);
    border-width: 3px;
    box-shadow: 0 0 12px rgba(var(--color-primary-rgb, 139, 127, 255), 0.3);
}

.loading-spinner--lg,
.spinner-lg {
    width: var(--loading-spinner-lg);
    height: var(--loading-spinner-lg);
    border-width: 4px;
}

.loading-spinner--xl,
.spinner-xl {
    width: var(--loading-spinner-xl);
    height: var(--loading-spinner-xl);
    border-width: 5px;
    box-shadow: 0 0 24px rgba(var(--color-primary-rgb, 139, 127, 255), 0.4);
}

/* Loading Message */
.loading-message {
    margin-top: 1.5rem;
    color: var(--loading-color-text);
    font-size: 1rem;
    animation: pulse-message 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    letter-spacing: 0.2px;
    line-height: 1.5;
    max-width: 300px;
}

.loading-state--inline .loading-message {
    margin-top: 0;
    margin-left: 0.5rem;
}

@keyframes pulse-message {
    0%, 100% {
        opacity: 0.6;
    }
    40%, 60% {
        opacity: 1;
    }
}

/* Inline Spinner (for buttons) */
.inline-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-top-color: rgba(255, 255, 255, 0.95);
    border-right-color: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: spinner-rotate 0.7s linear infinite;
    vertical-align: middle;
    margin-right: 0.5rem;
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.2);
}

@keyframes spinner-rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    border-radius: inherit;
}

.loading-overlay-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    background: rgba(30, 27, 75, 0.9);
    border: 2px solid rgba(147, 51, 234, 0.4);
    border-radius: 16px;
}

/* ============================================
   ERROR STATE - POLISHED
   ============================================ */

.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    text-align: center;
    background: linear-gradient(
        135deg,
        rgba(239, 68, 68, 0.08) 0%,
        rgba(239, 68, 68, 0.04) 100%
    );
    border: 2px solid rgba(239, 68, 68, 0.25);
    border-radius: 16px;
    margin: 1rem 0;
    animation: errorFadeIn var(--loading-transition-slow) ease-out;
    position: relative;
    overflow: hidden;
}

/* Subtle glow effect */
.error-state::before {
    content: '';
    position: absolute;
    inset: -50%;
    background: radial-gradient(
        circle at center,
        rgba(239, 68, 68, 0.1) 0%,
        transparent 50%
    );
    opacity: 0.5;
    animation: errorGlow 3s ease-in-out infinite;
    pointer-events: none;
}

@keyframes errorGlow {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.05); }
}

@keyframes errorFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.error-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    position: relative;
    z-index: 1;
    animation: errorShake 0.6s ease-in-out;
    filter: drop-shadow(0 4px 12px rgba(239, 68, 68, 0.4));
}

@keyframes errorShake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}

.error-title {
    color: #fca5a5;
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    margin: 0 0 0.75rem;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.error-message {
    color: var(--loading-color-text-bright);
    font-size: 1rem;
    line-height: 1.6;
    max-width: 500px;
    margin: 0 0 1.5rem;
    position: relative;
    z-index: 1;
    opacity: 0.9;
}

.error-details {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    font-size: 0.8rem;
    color: rgba(252, 165, 165, 0.7);
    background: rgba(0, 0, 0, 0.3);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    max-width: 100%;
    overflow-x: auto;
    word-break: break-word;
}

.error-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.error-retry-btn,
.btn-retry {
    padding: 0.875rem 2rem;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.25) 0%, rgba(239, 68, 68, 0.15) 100%);
    border: 2px solid rgba(239, 68, 68, 0.5);
    border-radius: 12px;
    color: #fca5a5;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--loading-transition-fast) ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 48px; /* WCAG touch target */
}

.error-retry-btn:hover,
.btn-retry:hover {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.35) 0%, rgba(239, 68, 68, 0.25) 100%);
    border-color: rgba(239, 68, 68, 0.7);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.3);
}

.error-retry-btn:active,
.btn-retry:active {
    transform: translateY(0);
}

.error-retry-btn:focus-visible,
.btn-retry:focus-visible {
    outline: 3px solid rgba(239, 68, 68, 0.6);
    outline-offset: 2px;
}

.btn-go-back {
    padding: 0.875rem 2rem;
    background: transparent;
    border: 2px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.5);
    border-radius: 12px;
    color: var(--loading-color-text);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--loading-transition-fast) ease;
    min-height: 48px;
}

.btn-go-back:hover {
    border-color: var(--loading-color-primary);
    color: var(--loading-color-text-bright);
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.1);
}

/* Error state variants */
.error-state--warning {
    background: linear-gradient(
        135deg,
        rgba(245, 158, 11, 0.08) 0%,
        rgba(245, 158, 11, 0.04) 100%
    );
    border-color: rgba(245, 158, 11, 0.25);
}

.error-state--warning .error-title {
    color: #fcd34d;
}

.error-state--warning .error-retry-btn {
    background: rgba(245, 158, 11, 0.2);
    border-color: rgba(245, 158, 11, 0.5);
    color: #fcd34d;
}

.error-state--info {
    background: linear-gradient(
        135deg,
        rgba(var(--color-primary-rgb, 139, 127, 255), 0.08) 0%,
        rgba(var(--color-primary-rgb, 139, 127, 255), 0.04) 100%
    );
    border-color: rgba(var(--color-primary-rgb, 139, 127, 255), 0.25);
}

.error-state--info .error-title {
    color: var(--loading-color-primary);
}

.error-state--compact {
    padding: 1.5rem;
}

.error-state--compact .error-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.error-state--compact .error-title {
    font-size: 1.125rem;
}

.error-state--compact .error-message {
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Success State */
.success-state {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: rgba(34, 197, 94, 0.1);
    border: 2px solid rgba(34, 197, 94, 0.4);
    border-radius: 12px;
    margin: 1rem 0;
}

.success-icon {
    font-size: 2rem;
}

.success-message {
    color: #86efac;
    font-size: 1.1rem;
    font-weight: 500;
    margin: 0;
}

/* ============================================
   EMPTY STATE - POLISHED
   ============================================ */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    animation: fadeIn var(--loading-transition-normal) ease-out;
    min-height: 300px;
}

.empty-state--compact {
    padding: 2rem 1.5rem;
    min-height: 200px;
}

.empty-state--inline {
    padding: 1.5rem;
    min-height: auto;
}

.empty-visual {
    position: relative;
    margin-bottom: 1.5rem;
}

.empty-icon {
    font-size: 4rem;
    opacity: 0.6;
    margin-bottom: 0;
    filter: drop-shadow(0 4px 8px rgba(var(--color-primary-rgb, 139, 127, 255), 0.2));
    animation: emptyIconFloat 3s ease-in-out infinite;
}

@keyframes emptyIconFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* SVG icon support */
.empty-icon-svg {
    width: 80px;
    height: 80px;
    opacity: 0.5;
    color: var(--loading-color-primary);
    filter: drop-shadow(0 4px 8px rgba(var(--color-primary-rgb, 139, 127, 255), 0.2));
}

.empty-state--compact .empty-icon {
    font-size: 3rem;
}

.empty-state--compact .empty-icon-svg {
    width: 60px;
    height: 60px;
}

.empty-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    color: var(--loading-color-text-bright);
    margin: 0 0 0.75rem;
}

.empty-message {
    color: var(--loading-color-text);
    font-size: 1rem;
    line-height: 1.6;
    margin: 0 0 2rem;
    max-width: 400px;
    opacity: 0.85;
}

.empty-state--compact .empty-title {
    font-size: 1.125rem;
}

.empty-state--compact .empty-message {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* Empty state actions */
.empty-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.empty-action-btn,
.btn-empty-action {
    padding: 0.875rem 2rem;
    background: linear-gradient(135deg, var(--loading-color-primary) 0%, rgba(var(--color-primary-rgb, 139, 127, 255), 0.8) 100%);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--loading-transition-fast) ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 48px;
    box-shadow: 0 4px 15px rgba(var(--color-primary-rgb, 139, 127, 255), 0.3);
}

.empty-action-btn:hover,
.btn-empty-action:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(var(--color-primary-rgb, 139, 127, 255), 0.4);
}

.empty-action-btn:active,
.btn-empty-action:active {
    transform: translateY(0);
}

.empty-action-btn:focus-visible,
.btn-empty-action:focus-visible {
    outline: 3px solid rgba(var(--color-primary-rgb, 139, 127, 255), 0.6);
    outline-offset: 2px;
}

.btn-empty-secondary {
    padding: 0.875rem 2rem;
    background: transparent;
    border: 2px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.5);
    border-radius: 12px;
    color: var(--loading-color-text);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--loading-transition-fast) ease;
    min-height: 48px;
}

.btn-empty-secondary:hover {
    border-color: var(--loading-color-primary);
    color: var(--loading-color-text-bright);
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.1);
}

/* Empty state suggestions */
.empty-suggestions {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.3);
    width: 100%;
    max-width: 500px;
}

.empty-suggestions-label {
    font-size: 0.875rem;
    color: var(--loading-color-text);
    margin-bottom: 1rem;
    opacity: 0.8;
}

.empty-suggestions-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.empty-suggestion-chip {
    padding: 0.5rem 1rem;
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.1);
    border: 1px solid rgba(var(--color-primary-rgb, 139, 127, 255), 0.2);
    border-radius: 20px;
    color: var(--loading-color-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--loading-transition-fast) ease;
}

.empty-suggestion-chip:hover {
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.2);
    border-color: var(--loading-color-primary);
    transform: translateY(-1px);
}

/* Empty state variants */
.empty-state--search {
    padding: 3rem 2rem;
}

.empty-state--list {
    grid-column: 1 / -1;
}

.empty-state--card {
    background: var(--loading-color-bg);
    border: 2px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.3);
    border-radius: 16px;
    padding: 3rem 2rem;
}

/* Skeleton Loaders */
.skeleton-container {
    animation: skeleton-fade-in 0.4s ease;
}

@keyframes skeleton-fade-in {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Skeleton shimmer effect */
@keyframes skeleton-shimmer {
    0% {
        background-position: -1000px 0;
    }
    50% {
        background-position: 1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.skeleton-shimmer {
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.05) 0%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.05) 100%
    );
    background-size: 1000px 100%;
    animation: skeleton-shimmer 2s infinite linear;
}

/* Skeleton Cards */
.skeleton-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.skeleton-card {
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid rgba(147, 51, 234, 0.15);
    border-radius: 12px;
    padding: 1.5rem;
    animation: pulse-subtle 2.4s ease-in-out infinite;
}

@keyframes pulse-subtle {
    0%, 100% {
        opacity: 0.85;
    }
    50% {
        opacity: 1;
    }
}

.skeleton-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: skeleton-shimmer 2s infinite linear;
    background-size: 1000px 100%;
}

.skeleton-title {
    height: 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    margin-bottom: 1rem;
    width: 80%;
    animation: skeleton-shimmer 2s infinite linear;
    background-size: 1000px 100%;
}

.skeleton-text {
    height: 14px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    margin-bottom: 0.75rem;
    animation: skeleton-shimmer 2s infinite linear;
    background-size: 1000px 100%;
}

.skeleton-text-short {
    width: 60%;
}

.skeleton-text-xs {
    height: 12px;
    width: 80px;
}

.skeleton-footer {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Skeleton List */
.skeleton-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skeleton-list-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(147, 51, 234, 0.2);
    border-radius: 8px;
}

.skeleton-list-content {
    flex: 1;
}

/* Skeleton Text Block */
.skeleton-text-block {
    padding: 1rem;
}

/* Skeleton Form */
.skeleton-form {
    padding: 2rem;
}

.skeleton-form-group {
    margin-bottom: 1.5rem;
}

.skeleton-label {
    height: 16px;
    width: 120px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    margin-bottom: 0.5rem;
    animation: skeleton-shimmer 2s infinite linear;
    background-size: 1000px 100%;
}

.skeleton-input {
    height: 42px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    animation: skeleton-shimmer 2s infinite linear;
    background-size: 1000px 100%;
}

.skeleton-textarea {
    height: 120px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    animation: skeleton-shimmer 2s infinite linear;
    background-size: 1000px 100%;
}

.skeleton-button {
    height: 44px;
    width: 150px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    margin-top: 1rem;
    animation: skeleton-shimmer 2s infinite linear;
    background-size: 1000px 100%;
}

/* ============================================
   PROGRESS INDICATORS
   ============================================ */

/* Linear Progress Bar */
.progress-bar-container {
    width: 100%;
    max-width: 400px;
    margin: 1rem 0;
}

.progress-bar-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--loading-color-text);
}

.progress-bar-percent {
    font-weight: 600;
    color: var(--loading-color-primary);
    font-variant-numeric: tabular-nums;
}

.progress-bar-track {
    height: 8px;
    background: rgba(var(--color-primary-rgb, 139, 127, 255), 0.15);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(
        90deg,
        var(--loading-color-primary) 0%,
        var(--loading-color-secondary) 100%
    );
    border-radius: 4px;
    transition: width var(--loading-transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%
    );
    animation: progressGlow 1.5s ease-in-out infinite;
}

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

/* Indeterminate progress */
.progress-bar-track--indeterminate .progress-bar-fill {
    width: 30% !important;
    animation: progressIndeterminate 1.5s ease-in-out infinite;
}

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

/* Thin progress bar (for top of page) */
.progress-bar--thin {
    height: 3px;
}

.progress-bar--thin .progress-bar-track {
    height: 3px;
    border-radius: 0;
}

/* ============================================
   BUTTON LOADING STATES
   ============================================ */

.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.85;
}

.btn-loading .btn-text {
    opacity: 0.7;
}

.btn-loading .btn-spinner {
    display: inline-flex;
    margin-right: 0.5rem;
}

/* Button with integrated spinner */
.btn-loading-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-loading-inline .loading-spinner {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

/* Disabled state during loading */
.btn[disabled],
.btn-primary[disabled],
.btn-secondary[disabled],
.btn:disabled,
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(30%);
    transform: none !important;
    box-shadow: none;
    transition: opacity var(--loading-transition-fast, 150ms) ease,
                filter var(--loading-transition-fast, 150ms) ease;
}

/* Disabled button hover - prevent any hover effect */
.btn[disabled]:hover,
.btn-primary[disabled]:hover,
button:disabled:hover {
    transform: none !important;
    box-shadow: none;
    background: inherit;
}

/* ============================================
   FORM SUBMISSION STATES
   ============================================ */

.form-submitting {
    position: relative;
    pointer-events: none;
}

.form-submitting::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    border-radius: inherit;
    z-index: 10;
}

.form-submit-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border-radius: inherit;
    z-index: 11;
    animation: fadeIn var(--loading-transition-fast) ease-out;
}

.form-submit-message {
    margin-top: 1rem;
    color: var(--loading-color-text);
    font-size: 0.9rem;
}

/* Input loading state */
.input-loading {
    position: relative;
}

.input-loading::after {
    content: '';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid rgba(var(--color-primary-rgb, 139, 127, 255), 0.2);
    border-top-color: var(--loading-color-primary);
    border-radius: 50%;
    animation: spinner-rotate 0.75s linear infinite;
}

/* ============================================
   FILE UPLOAD PROGRESS
   ============================================ */

.upload-progress-container {
    background: var(--loading-color-bg);
    border: 2px solid rgba(var(--color-border-primary-rgb, 42, 47, 74), 0.3);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1rem 0;
}

.upload-file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.upload-file-icon {
    font-size: 2rem;
    opacity: 0.8;
}

.upload-file-details {
    flex: 1;
}

.upload-file-name {
    font-weight: 600;
    color: var(--loading-color-text-bright);
    margin-bottom: 0.25rem;
    word-break: break-all;
}

.upload-file-size {
    font-size: 0.875rem;
    color: var(--loading-color-text);
}

.upload-progress-bar {
    margin-bottom: 0.75rem;
}

.upload-progress-status {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--loading-color-text);
}

.upload-progress-status--success {
    color: var(--loading-color-success);
}

.upload-progress-status--error {
    color: var(--loading-color-error);
}

/* ============================================
   CONTENT TRANSITIONS
   ============================================ */

.content-fade-enter {
    opacity: 0;
    transform: translateY(10px);
}

.content-fade-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--loading-transition-normal) ease-out,
                transform var(--loading-transition-normal) ease-out;
}

.content-fade-exit {
    opacity: 1;
    transform: translateY(0);
}

.content-fade-exit-active {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--loading-transition-fast) ease-out,
                transform var(--loading-transition-fast) ease-out;
}

/* Skeleton to content transition */
.skeleton-transition {
    position: relative;
}

.skeleton-transition .skeleton-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    transition: opacity var(--loading-transition-normal) ease-out;
}

.skeleton-transition.content-ready .skeleton-overlay {
    opacity: 0;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    .skeleton-cards {
        grid-template-columns: 1fr;
    }

    .loading-state,
    .error-state,
    .empty-state {
        padding: 2rem 1rem;
    }

    .error-icon,
    .empty-icon {
        font-size: 2.5rem;
    }

    .error-actions,
    .empty-actions {
        flex-direction: column;
        width: 100%;
    }

    .error-retry-btn,
    .btn-retry,
    .btn-go-back,
    .empty-action-btn,
    .btn-empty-action,
    .btn-empty-secondary {
        width: 100%;
        justify-content: center;
    }

    .progress-bar-container {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .loading-state {
        padding: 1.5rem 1rem;
        min-height: 150px;
    }

    .error-state,
    .empty-state {
        padding: 1.5rem 1rem;
    }

    .loading-message {
        font-size: 0.9rem;
    }

    .error-title,
    .empty-title {
        font-size: 1.125rem;
    }

    .error-message,
    .empty-message {
        font-size: 0.9rem;
    }
}

/* ============================================
   ACCESSIBILITY: REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    .loading-spinner,
    .loading-spinner--sm,
    .loading-spinner--md,
    .loading-spinner--lg,
    .loading-spinner--xl,
    .spinner-sm,
    .spinner-md,
    .spinner-lg,
    .spinner-xl {
        animation: none !important;
    }

    .loading-message,
    .error-icon,
    .empty-icon {
        animation: none !important;
    }

    .skeleton-shimmer,
    .skeleton-card,
    .skeleton-avatar,
    .skeleton-title,
    .skeleton-text,
    .skeleton-label,
    .skeleton-input,
    .skeleton-textarea,
    .skeleton-button {
        animation: none !important;
        background: rgba(255, 255, 255, 0.08) !important;
    }

    .progress-bar-fill::after {
        animation: none !important;
    }

    .progress-bar-track--indeterminate .progress-bar-fill {
        animation: none !important;
        width: 50% !important;
        transform: translateX(100%);
    }

    .content-fade-enter,
    .content-fade-enter-active,
    .content-fade-exit,
    .content-fade-exit-active,
    .error-state,
    .empty-state,
    .loading-state {
        animation: none !important;
        transition: none !important;
        opacity: 1 !important;
        transform: none !important;
    }

    .error-state::before {
        animation: none !important;
    }
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */

@media (prefers-contrast: high) {
    .loading-spinner {
        border-width: 3px;
        box-shadow: none;
    }

    .error-state,
    .empty-state {
        border-width: 3px;
    }

    .error-retry-btn,
    .btn-retry,
    .btn-go-back,
    .empty-action-btn,
    .btn-empty-action,
    .btn-empty-secondary {
        border-width: 3px;
    }

    .progress-bar-track {
        border: 1px solid var(--loading-color-text);
    }

    .skeleton-card,
    .skeleton-list-item {
        border-width: 2px;
    }
}

/* ============================================
   THEME INTEGRATION
   ============================================ */

[data-theme="cosmic"] .loading-spinner {
    border-top-color: #00d4ff;
}

[data-theme="cosmic"] .progress-bar-fill {
    background: linear-gradient(90deg, #00d4ff 0%, #ff00d4 100%);
}

[data-theme="sacred"] .loading-spinner {
    border-top-color: #ffd700;
}

[data-theme="sacred"] .progress-bar-fill {
    background: linear-gradient(90deg, #ffd700 0%, #ff6b35 100%);
}

[data-theme="golden"] .loading-spinner {
    border-top-color: #daa520;
}

[data-theme="golden"] .progress-bar-fill {
    background: linear-gradient(90deg, #daa520 0%, #ffd700 100%);
}

[data-theme="ocean"] .loading-spinner {
    border-top-color: #00bcd4;
}

[data-theme="ocean"] .progress-bar-fill {
    background: linear-gradient(90deg, #00bcd4 0%, #80deea 100%);
}

[data-theme="fire"] .loading-spinner {
    border-top-color: #ff5722;
}

[data-theme="fire"] .progress-bar-fill {
    background: linear-gradient(90deg, #ff5722 0%, #ffeb3b 100%);
}