/* ============================================
   NERO — Loader Overlay
   Premium loading indicator
   ============================================ */

/* --- Variables --- */
:root {
    --loader-primary: #0A2E4D;
    --loader-bg: #ffffff;
    --loader-accent: #f1f5f9;
    --loader-overlay-opacity: 0.65;
    --loader-blur: 4px;
    --loader-size: 48px;
    --loader-border-width: 4px;
    --loader-radius: 16px;
    --loader-shadow: 0 8px 32px rgba(10, 46, 77, 0.18);
    --loader-z: 99999;
    --loader-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Overlay --- */
.loader-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--loader-z);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 46, 77, var(--loader-overlay-opacity));
    backdrop-filter: blur(var(--loader-blur));
    -webkit-backdrop-filter: blur(var(--loader-blur));
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--loader-transition), visibility var(--loader-transition);
    pointer-events: none;
    cursor: wait;
}

.loader-overlay.loader-active {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

/* --- Card --- */
.loader-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    padding: 36px 44px;
    background: var(--loader-bg);
    border-radius: var(--loader-radius);
    box-shadow: var(--loader-shadow);
    transform: scale(0.92);
    transition: transform var(--loader-transition);
}

.loader-overlay.loader-active .loader-card {
    transform: scale(1);
}

/* --- Spinner --- */
.loader-spinner {
    width: var(--loader-size);
    height: var(--loader-size);
    border-radius: 50%;
    border: var(--loader-border-width) solid var(--loader-accent);
    border-top-color: var(--loader-primary);
    animation: loader-spin 0.75s linear infinite;
}

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

/* --- Text --- */
.loader-text {
    font-family: 'Montserrat', Arial, sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--loader-primary);
    letter-spacing: 0.04em;
    user-select: none;
}

/* --- Pulse dots (optional alternative) --- */
.loader-dots {
    display: flex;
    gap: 6px;
}

.loader-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--loader-primary);
    animation: loader-pulse 1.2s ease-in-out infinite;
}

.loader-dots span:nth-child(2) { animation-delay: 0.15s; }
.loader-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes loader-pulse {
    0%, 80%, 100% { transform: scale(0.4); opacity: 0.3; }
    40% { transform: scale(1); opacity: 1; }
}

/* --- Body lock while loading --- */
body.loader-locked {
    overflow: hidden;
}