/**
 * T-0317: Loading States & Spinner Component
 * Reusable spinner and loading utilities
 */

/* ===== Spinner Component ===== */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 3px;
}

.spinner-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

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

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 15, 23, 0.85);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.loading-content {
    text-align: center;
    background: var(--surface);
    padding: var(--space-6);
    border-radius: var(--radius-2);
    box-shadow: var(--shadow-3);
    border: 1px solid var(--border);
}

.loading-text {
    margin-top: var(--space-3);
    color: var(--text);
    font-weight: 500;
}

/* ===== Skeleton Loading ===== */
.skeleton {
    background: linear-gradient(90deg,
            var(--surface) 0%,
            var(--surface-2) 50%,
            var(--surface) 100%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-1);
}

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

    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1em;
    margin-bottom: var(--space-2);
    width: 100%;
}

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

.skeleton-text.medium {
    width: 80%;
}

.skeleton-card {
    height: 120px;
    margin-bottom: var(--space-3);
}

.skeleton-line {
    height: 14px;
    margin-bottom: var(--space-2);
}

/* ===== Inline Field Errors ===== */
.field-error {
    display: none;
    color: var(--danger);
    font-size: var(--font-size-sm);
    margin-top: var(--space-1);
    line-height: 1.4;
}

.field-error.visible {
    display: block;
}

.form-field.has-error input,
.form-field.has-error select,
.form-field.has-error textarea {
    border-color: var(--danger);
    background: rgba(255, 77, 79, 0.05);
}

.form-field.has-error label {
    color: var(--danger);
}

/* ===== Button Loading States ===== */
.btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.btn-sm.loading::after {
    width: 14px;
    height: 14px;
}

/* Button disabled state (enhanced) */
.btn:disabled,
.btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}