/**
 * ACS Loading Spinner - Professional Loading Component
 * Version: 1.0.0
 */

/* ========================================
   Loading Overlay
   ======================================== */
.acs-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 999999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

/* ========================================
   Loading Container
   ======================================== */
.acs-loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    animation: fadeInScale 0.3s ease;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ========================================
   Spinner Styles
   ======================================== */
.acs-loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: #667eea;
    border-right-color: #764ba2;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    position: relative;
}

.acs-loading-spinner::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border: 4px solid transparent;
    border-top-color: rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    animation: spin 1.2s linear infinite reverse;
}

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

/* ========================================
   Loading Text
   ======================================== */
.acs-loading-text {
    color: #ffffff;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

/* ========================================
   Success State
   ======================================== */
.acs-loading-success .acs-loading-spinner {
    border-color: rgba(76, 175, 80, 0.2);
    border-top-color: #4caf50;
    border-right-color: #4caf50;
    animation: spin 0.5s ease-out, checkmark 0.5s ease 0.5s;
}

.acs-loading-success .acs-loading-text {
    color: #4caf50;
}

@keyframes checkmark {
    to {
        border-radius: 0;
        border-width: 0 4px 4px 0;
        transform: rotate(45deg) scale(0.8);
    }
}

/* ========================================
   Error State
   ======================================== */
.acs-loading-error .acs-loading-spinner {
    border-color: rgba(244, 67, 54, 0.2);
    border-top-color: #f44336;
    border-right-color: #f44336;
    animation: shake 0.5s ease;
}

.acs-loading-error .acs-loading-text {
    color: #f44336;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

/* ========================================
   Progress Bar (Optional)
   ======================================== */
.acs-loading-progress {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 10px;
}

.acs-loading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 2px;
}

/* ========================================
   Small Inline Spinner
   ======================================== */
.acs-loading-inline {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(102, 126, 234, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-left: 8px;
}

/* ========================================
   Button Loading State
   ======================================== */
.acs-btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.acs-btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    right: 12px;
    margin-top: -8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ========================================
   Dots Animation (Alternative)
   ======================================== */
.acs-loading-dots {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

.acs-loading-dot {
    width: 8px;
    height: 8px;
    background: #667eea;
    border-radius: 50%;
    animation: dotPulse 1.4s ease-in-out infinite;
}

.acs-loading-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.acs-loading-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes dotPulse {

    0%,
    80%,
    100% {
        transform: scale(0.8);
        opacity: 0.5;
    }

    40% {
        transform: scale(1.2);
        opacity: 1;
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .acs-loading-spinner {
        width: 50px;
        height: 50px;
    }

    .acs-loading-text {
        font-size: 14px;
    }

    .acs-loading-progress {
        width: 150px;
    }
}

/* ========================================
   Dark Mode Support
   ======================================== */
@media (prefers-color-scheme: dark) {
    .acs-loading-overlay {
        background: rgba(0, 0, 0, 0.85);
    }
}

/* ========================================
   Accessibility
   ======================================== */
.acs-loading-overlay[aria-hidden="true"] {
    display: none;
}

@media (prefers-reduced-motion: reduce) {

    .acs-loading-spinner,
    .acs-loading-spinner::before,
    .acs-loading-inline,
    .acs-loading-dot {
        animation-duration: 2s;
    }
}