/* Global Loading Spinner Component */
/* Enhanced with progressive messages and progress bar */

/* Inline Form Loading Spinner */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: var(--space-4);
    height: var(--space-4);
    top: 50%;
    left: 50%;
    margin-left: calc(var(--space-4) / -2);
    margin-top: calc(var(--space-4) / -2);
    border: calc(var(--space-1) / 2) solid transparent;
    border-top-color: currentColor;
    border-radius: var(--radius-md);
    animation: btn-spinner-rotate calc(var(--motion-dur-std) * 3) var(--motion-ease) infinite;
    color: var(--color-text-inverse);
}

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

/* Global Page Overlay Spinner */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--modal-backdrop);
    backdrop-filter: blur(var(--modal-backdrop-blur));
    -webkit-backdrop-filter: blur(var(--modal-backdrop-blur));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--motion-dur-slow) var(--motion-ease),
                visibility var(--motion-dur-slow) var(--motion-ease);
}

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

/* Enhanced Spinner Container */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    padding: var(--space-12) var(--space-10);
    background: var(--color-surface-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: calc(var(--space-1) / 4) solid var(--color-border-primary);
    width: calc(var(--space-16) * 4);
    min-height: calc(var(--space-16) * 5);
    position: relative;
    animation: slideUp var(--motion-dur-slow) var(--motion-ease);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(var(--space-5));
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Brain Icon Container with Pulse Effect */
.loading-spinner__brain-container {
    position: relative;
    width: calc(var(--space-16) + var(--space-4));
    height: calc(var(--space-16) + var(--space-4));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-2);
}

.loading-spinner__brain-icon {
    width: var(--space-12);
    height: var(--space-12);
    color: var(--color-accent);
    position: relative;
    z-index: 2;
    animation: brainPulse calc(var(--motion-dur-slow) * 4) var(--motion-ease) infinite;
}

.loading-spinner__brain-pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: var(--space-14);
    height: var(--space-14);
    border-radius: var(--radius-full);
    background: radial-gradient(
        circle,
        color-mix(in srgb, var(--color-accent) 25%, transparent) 0%,
        color-mix(in srgb, var(--color-accent) 8%, transparent) 50%,
        transparent 70%
    );
    animation: brainPulseRing calc(var(--motion-dur-slow) * 5) var(--motion-ease) infinite;
}

.loading-spinner__brain-pulse--delayed {
    animation-delay: calc(var(--motion-dur-slow) * 2.5);
}

@keyframes brainPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.08);
        opacity: 0.85;
    }
}

@keyframes brainPulseRing {
    0% {
        transform: translate(-50%, -50%) scale(0.6);
        opacity: 0.8;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.6);
        opacity: 0;
    }
}

/* Synapse Animations for Brain SVG */
.loading-spinner__brain-icon .synapse {
    opacity: 0.4;
    transform-origin: center center;
    transform-box: fill-box;
}

.loading-spinner__brain-icon .synapse-1 { animation: synapseFire 1.5s ease-in-out infinite 0s; }
.loading-spinner__brain-icon .synapse-2 { animation: synapseFire 1.5s ease-in-out infinite 0.2s; }
.loading-spinner__brain-icon .synapse-3 { animation: synapseFire 1.5s ease-in-out infinite 0.4s; }
.loading-spinner__brain-icon .synapse-4 { animation: synapseFire 1.5s ease-in-out infinite 0.6s; }
.loading-spinner__brain-icon .synapse-5 { animation: synapseFire 1.5s ease-in-out infinite 0.8s; }
.loading-spinner__brain-icon .synapse-6 { animation: synapseFire 1.5s ease-in-out infinite 1.0s; }
.loading-spinner__brain-icon .synapse-7 { animation: synapseFire 1.5s ease-in-out infinite 1.2s; }
.loading-spinner__brain-icon .synapse-8 { animation: synapseFire 1.5s ease-in-out infinite 0.3s; }
.loading-spinner__brain-icon .synapse-9 { animation: synapseFire 1.5s ease-in-out infinite 0.9s; }

@keyframes synapseFire {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.5);
    }
}

.loading-spinner__brain-icon .brain-outline {
    animation: brainOutlinePulse 2s ease-in-out infinite;
}

@keyframes brainOutlinePulse {
    0%, 100% {
        stroke-opacity: 1;
    }
    50% {
        stroke-opacity: 0.7;
    }
}

/* Logo */
.loading-spinner__logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}

.loading-spinner__logo-text {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent);
    font-family: var(--font-body);
    letter-spacing: -0.02em;
}

/* Text Content */
.loading-spinner__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    text-align: center;
    width: 100%;
}

.loading-spinner__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    min-height: var(--space-7);
    transition: opacity var(--motion-dur-slow) var(--motion-ease);
}

.loading-spinner__subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--lh-body);
    min-height: var(--space-5);
    transition: opacity var(--motion-dur-slow) var(--motion-ease);
}

/* Progress Section with Percentage */
.loading-spinner__progress-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.loading-spinner__percentage {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-accent);
    font-family: var(--font-mono);
    letter-spacing: -0.02em;
    min-width: var(--space-14);
    text-align: center;
    transition: all var(--motion-dur-std) var(--motion-ease);
}

/* Progress Bar */
.loading-spinner__progress {
    width: 100%;
}

.loading-spinner__progress-track {
    width: 100%;
    height: var(--space-1);
    background: var(--color-surface-secondary);
    border-radius: var(--radius-sm);
    overflow: visible;
    position: relative;
}

.loading-spinner__progress-bar {
    height: 100%;
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    transition: width calc(var(--motion-dur-std) * 4) var(--motion-ease);
    position: relative;
    overflow: visible;
    box-shadow: 0 0 calc(var(--space-2) + var(--space-1)) color-mix(in srgb, var(--color-accent) 40%, transparent);
}

/* Progress bar breathing glow effect */
.loading-spinner__progress-bar::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 100%;
    transform: translate(-50%, -50%);
    width: calc(var(--space-4) + var(--space-2));
    height: calc(var(--space-4) + var(--space-2));
    background: radial-gradient(
        circle,
        color-mix(in srgb, var(--neutral-0) 60%, transparent) 0%,
        transparent 70%
    );
    border-radius: var(--radius-full);
    animation: breathe calc(var(--motion-dur-slow) * 6) var(--motion-ease) infinite;
    pointer-events: none;
}

@keyframes breathe {
    0%, 100% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0.6;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 1;
    }
}

/* Text fade transition */
.loading-spinner__title.fade,
.loading-spinner__subtitle.fade {
    opacity: 0;
}

/* Inline Spinner (for buttons and small areas) */
.spinner-inline {
    display: inline-block;
    width: calc(var(--space-3) + var(--space-1) / 2);
    height: calc(var(--space-3) + var(--space-1) / 2);
    border: calc(var(--space-1) / 2) solid var(--color-border-secondary);
    border-top-color: var(--color-accent);
    border-radius: var(--radius-md);
    animation: spinner-rotate calc(var(--motion-dur-std) * 3) var(--motion-ease) infinite;
    vertical-align: middle;
}

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

/* Minimal variant for auth forms */
.loading-overlay-minimal {
    background: color-mix(in srgb, var(--neutral-0) 70%, transparent);
}

[data-theme="dark"] .loading-overlay-minimal {
    background: color-mix(in srgb, var(--neutral-900) 40%, transparent);
}

/* Disabled state for form inputs during loading */
.form-loading input,
.form-loading textarea,
.form-loading select {
    opacity: var(--opacity-disabled, 0.6);
    pointer-events: none;
}

/* Responsive */
@media (max-width: calc(var(--space-16) * 6)) {
    .loading-spinner {
        width: calc(var(--space-16) * 3);
        min-height: calc(var(--space-16) * 4);
        padding: var(--space-8) var(--space-6);
    }
    
    .loading-spinner__logo-text {
        font-size: var(--font-size-xl);
    }
    
    .loading-spinner__brain-container {
        width: var(--space-14);
        height: var(--space-14);
    }
    
    .loading-spinner__brain-icon {
        width: var(--space-10);
        height: var(--space-10);
    }
    
    .loading-spinner__percentage {
        font-size: var(--font-size-2xl);
    }
}