/* ===== VARIABLES CSS ===== */
:root {
    /* Colores principales */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2c3e50;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
    --info-color: #17a2b8;
    
    /* Colores de fondo */
    --bg-primary: #f4f7f9;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-dark: #343a40;
    
    /* Colores de texto */
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-muted: #95a5a6;
    
    /* Bordes y sombras */
    --border-color: #e0e6ed;
    --border-light: #f1f3f4;
    --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 15px rgba(0, 0, 0, 0.1);
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Bordes redondeados */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Transiciones */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== LOGO STYLES ===== */
.logo-icon {
    transition: transform 0.3s ease, filter 0.3s ease;
}

.logo-icon:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 4px 8px rgba(74, 144, 226, 0.3));
}

.bf-logo-icon .logo-icon {
    width: 32px;
    height: 32px;
}

/* ===== ESTILOS GENERALES ===== */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 16px;
}

/* ===== HEADER ===== */
header {
    background-color: var(--bg-white);
    padding: var(--spacing-md) var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

header h1 {
    color: var(--secondary-color);
    margin: 0;
    font-size: 1.8rem;
    font-weight: 700;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: var(--spacing-lg);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

nav a:hover {
    color: var(--primary-color);
    background-color: var(--bg-light);
}

/* ===== MAIN ===== */
main {
    padding: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

section {
    background-color: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-light);
}

h2 {
    color: var(--secondary-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: var(--spacing-sm);
    margin-top: 0;
    margin-bottom: var(--spacing-lg);
    font-size: 1.5rem;
    font-weight: 600;
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.1rem;
    line-height: 1.5;
}

/* ===== SISTEMA DE NOTIFICACIONES ===== */
.notification-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    max-width: 400px;
}

.notification {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid;
    background: var(--bg-white);
    position: relative;
    overflow: hidden;
    animation: slideInRight 0.3s ease;
}

.notification.success { border-left-color: var(--success-color); }
.notification.error { border-left-color: var(--error-color); }
.notification.warning { border-left-color: var(--warning-color); }
.notification.info { border-left-color: var(--info-color); }

.notification-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.notification-title {
    font-weight: 600;
    color: var(--text-primary);
}

.notification-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.notification-message {
    color: var(--text-secondary);
    margin: 0;
}

.notification-details {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ===== FORMULARIOS ===== */
.contract-form {
    max-width: 700px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.form-group label {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--secondary-color);
    font-size: 1rem;
}

.field-icon {
    margin-right: var(--spacing-sm);
    font-size: 1.1rem;
}

.required-indicator {
    color: var(--error-color);
    margin-left: var(--spacing-xs);
    font-weight: 700;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    transition: all var(--transition-normal);
    background-color: var(--bg-white);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group input.field-error,
.form-group select.field-error {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.form-group input.field-success,
.form-group select.field-success {
    border-color: var(--success-color);
    box-shadow: 0 0 0 3px rgba(39, 174, 96, 0.1);
}

.field-help {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    line-height: 1.4;
}

.field-error-message {
    color: var(--error-color);
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
    font-weight: 500;
    display: none;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.create-btn,
.preview-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    flex: 1;
}

.btn-icon {
    margin-right: var(--spacing-sm);
}

.create-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.create-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.preview-btn {
    background-color: var(--bg-light);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.preview-btn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* ===== ESTADÍSTICAS ===== */
.contracts-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== LISTA DE CONTRATOS ===== */
.contracts-list {
    display: grid;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.contract-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.contract-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.contract-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.blockchain-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blockchain-badge.bitcoin {
    background-color: #f7931a;
    color: white;
}

.blockchain-badge.ethereum {
    background-color: #627eea;
    color: white;
}

.blockchain-badge.solana {
    background-color: #14f195;
    color: #1a1a1a;
}

.status-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge.activo {
    background-color: var(--success-color);
    color: white;
}

.status-badge.pendiente {
    background-color: var(--warning-color);
    color: white;
}

.status-badge.completado {
    background-color: var(--text-muted);
    color: white;
}

.contract-details p {
    margin: var(--spacing-sm) 0;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contract-details strong {
    color: var(--text-primary);
    font-weight: 600;
}

.contract-actions {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
}

.btn-secondary {
    background-color: var(--text-secondary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 500;
}

.btn-secondary:hover {
    background-color: var(--text-primary);
    transform: translateY(-1px);
}

/* ===== MENSAJES DE ESTADO ===== */
.loading-message {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.no-contracts {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: var(--spacing-xl);
    background-color: var(--bg-light);
    border-radius: var(--border-radius-md);
    border: 2px dashed var(--border-color);
}

/* ===== FOOTER ===== */
footer {
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-light);
}

.version-info {
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    nav a {
        margin-left: var(--spacing-sm);
        margin-right: var(--spacing-sm);
    }
    
    main {
        padding: var(--spacing-md);
    }
    
    section {
        padding: var(--spacing-md);
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .contracts-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-value {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .contract-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
    
    .contract-details p {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}