/* ============================================
                Taco Bell Colors
   ============================================ */
:root {
    /* Brand Colors */
    --primary-color: #5b2c74;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --background-light: #ecf0f1;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --white: #ffffff;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-light);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    padding: var(--spacing-md);
}

/* ============================================
   CONTAINER
   ============================================ */
.container {
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-lg);
}

.logo-container {
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo-image {
    max-width: 180px;
    width: 100%;
    height: auto;
    display: block;
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

/* ============================================
   CARD
   ============================================ */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   FORM STYLES
   ============================================ */
.form-section {
    margin-bottom: var(--spacing-xl);
}

.validation-form {
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.input-wrapper {
    position: relative;
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1.1rem;
    border: 2px solid #ddd;
    border-radius: var(--radius-md);
    background: var(--white);
    color: var(--text-dark);
    transition: all var(--transition-normal);
    font-family: 'Courier New', monospace;
    letter-spacing: 0.5px;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(91, 44, 116, 0.1);
}

.form-input.valid {
    border-color: var(--secondary-color);
}

.form-input.invalid {
    border-color: var(--accent-color);
}

.form-input::placeholder {
    color: var(--text-light);
}

/* Character Counter */
.character-counter {
    text-align: right;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
    font-weight: 500;
}

.character-counter.complete {
    color: var(--secondary-color);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn-primary,
.btn-secondary {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background: #4a2360;
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
    opacity: 0.6;
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    margin-top: var(--spacing-md);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
}

/* Button Loading State */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   INFO BOX
   ============================================ */
.info-box {
    background: rgba(91, 44, 116, 0.05);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
}

.info-text {
    font-size: 0.95rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.info-description {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   RESULT SECTION
   ============================================ */
.result-section {
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card {
    text-align: center;
}

.result-header {
    margin-bottom: var(--spacing-lg);
}

.success-icon,
.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.result-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0;
}

/* Success Card */
.success-card {
    border-top: 4px solid var(--secondary-color);
}

/* Error Card */
.error-card {
    border-top: 4px solid var(--accent-color);
}

.error-message {
    font-size: 1rem;
    color: var(--text-light);
    margin: var(--spacing-lg) 0;
    line-height: 1.6;
}

/* ============================================
   QR CODE
   ============================================ */
.qr-container {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border: 2px solid var(--background-light);
}

.qr-image {
    width: 100%;
    max-width: 280px;
    height: auto;
    cursor: pointer;
    transition: transform var(--transition-normal);
    border-radius: var(--radius-sm);
}

.qr-image:hover {
    transform: scale(1.05);
}

.qr-instruction {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-top: var(--spacing-md);
    margin-bottom: 0;
}

/* ============================================
   COMPROBANTE INFO
   ============================================ */
.comprobante-info {
    background: var(--background-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #ddd;
}

.info-item:last-child {
    border-bottom: none;
}

.info-label {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

.info-value {
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 600;
}

/* ============================================
   FOOTER
   ============================================ */
footer {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--white);
    border-top: 1px solid #ddd;
    margin-top: auto;
}

footer p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0;
}

/* ============================================
   RESPONSIVE - TABLET & DESKTOP
   ============================================ */
@media (min-width: 768px) {
    html {
        font-size: 18px;
    }
    
    main {
        padding: var(--spacing-xl);
    }
    
    .container {
        max-width: 600px;
    }
    
    .card {
        padding: var(--spacing-xl);
    }
    
    .qr-image {
        max-width: 320px;
    }
    
    .logo-image {
        max-width: 220px;
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: 700px;
    }
    
    .btn-primary,
    .btn-secondary {
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .logo-image {
        max-width: 250px;
    }
}

/* Animación para flash messages */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-left: 4px solid;
}

.alert-success {
    border-left-color: #28a745;
}

.alert-warning {
    border-left-color: #ffc107;
}

.alert-danger {
    border-left-color: #dc3545;
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}