/* ===== ESTILOS MODERNOS 2025 ===== */
:root {
    /* Colores Modernos - Paleta Vibrante */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --danger-gradient: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    
    /* Colores Sólidos Modernos */
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #4facfe;
    --success-color: #43e97b;
    --warning-color: #fa709a;
    --danger-color: #ff9a9e;
    
    /* Colores de Fondo Modernos */
    --bg-primary: #0a0e1a;
    --bg-secondary: #1a1f2e;
    --bg-glass: rgba(255, 255, 255, 0.1);
    --bg-card: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    
    /* Efectos Modernos */
    --glass-blur: blur(20px);
    --border-glass: 1px solid rgba(255, 255, 255, 0.2);
    --shadow-soft: 0 8px 32px rgba(31, 38, 135, 0.37);
    --shadow-strong: 0 15px 50px rgba(0, 0, 0, 0.3);
    --shadow-neon: 0 0 20px rgba(102, 126, 234, 0.5);
    
    /* Bordes y Espaciado */
    --border-radius-sm: 12px;
    --border-radius-md: 20px;
    --border-radius-lg: 30px;
    --border-radius-full: 50px;
    
    /* Animaciones */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --transition-elastic: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Reset y Base Moderno */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 50%, #16213e 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animación de fondo flotante */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 198, 121, 0.3) 0%, transparent 50%);
    z-index: -1;
    animation: backgroundShift 20s ease-in-out infinite;
}

@keyframes backgroundShift {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-10px) rotate(1deg); }
    66% { transform: translateY(10px) rotate(-1deg); }
}

/* Tipografía Moderna */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px;
}

/* Header Moderno con Glassmorphism */
header {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    border: var(--border-glass);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
    padding: 40px 30px;
    margin-bottom: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

header:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-strong);
}

header h1 {
    font-size: 3rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    text-shadow: 0 0 30px rgba(102, 126, 234, 0.5);
}

header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* Layout Moderno */
.app-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 30px;
    align-items: start;
}

@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
    }
}

/* Cards con Glassmorphism */
.search-section,
.actions-panel,
.contacts-section {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    border: var(--border-glass);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-soft);
    padding: 30px;
    transition: var(--transition-smooth);
}

.search-section:hover,
.actions-panel:hover,
.contacts-section:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

/* Búsqueda Moderna */
.search-box {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    position: relative;
}

.search-box input {
    flex: 1;
    padding: 18px 25px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm) 0 0 var(--border-radius-sm);
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition-smooth);
    backdrop-filter: var(--glass-blur);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
    outline: none;
}

.search-box button {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 18px 25px;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-weight: 600;
    position: relative;
    overflow: hidden;
}

.search-box button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.search-box button:hover::before {
    left: 100%;
}

.search-box button:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-neon);
}

/* Títulos de Secciones */
.actions-panel h2,
.contacts-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.actions-panel h2::after,
.contacts-header h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* Botones Modernos con Gradientes */
.btn {
    display: block;
    width: 100%;
    padding: 18px 25px;
    margin-bottom: 12px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-bounce);
    text-align: center;
    text-decoration: none;
    color: white;
    position: relative;
    overflow: hidden;
    backdrop-filter: var(--glass-blur);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
}

.btn-success {
    background: var(--success-gradient);
    box-shadow: 0 4px 15px rgba(67, 233, 123, 0.4);
}

.btn-success:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(67, 233, 123, 0.6);
}

.btn-warning {
    background: var(--warning-gradient);
    box-shadow: 0 4px 15px rgba(250, 112, 154, 0.4);
}

.btn-warning:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(250, 112, 154, 0.6);
}

.btn-danger {
    background: var(--danger-gradient);
    box-shadow: 0 4px 15px rgba(255, 154, 158, 0.4);
}

.btn-danger:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(255, 154, 158, 0.6);
}

/* Tabla Moderna */
.contacts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.contacts-count {
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.1rem;
}

.contacts-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 8px;
}

.contacts-table th {
    background: var(--bg-card);
    padding: 18px 20px;
    text-align: left;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contacts-table td {
    padding: 18px 20px;
    background: var(--bg-glass);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.contacts-table tr {
    transition: var(--transition-smooth);
}

.contacts-table tr:hover td {
    background: var(--bg-card);
    transform: scale(1.02);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.contacts-table td:first-child {
    border-radius: var(--border-radius-sm) 0 0 var(--border-radius-sm);
}

.contacts-table td:last-child {
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

/* Categorías con Gradientes */
.contact-category {
    display: inline-block;
    padding: 8px 16px;
    border-radius: var(--border-radius-full);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    backdrop-filter: var(--glass-blur);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.category-personal {
    background: linear-gradient(135deg, rgba(65, 165, 255, 0.3), rgba(65, 165, 255, 0.1));
    color: #41a5ff;
    box-shadow: 0 2px 10px rgba(65, 165, 255, 0.3);
}

.category-professional {
    background: linear-gradient(135deg, rgba(67, 233, 123, 0.3), rgba(67, 233, 123, 0.1));
    color: #43e97b;
    box-shadow: 0 2px 10px rgba(67, 233, 123, 0.3);
}

.category-family {
    background: linear-gradient(135deg, rgba(250, 112, 154, 0.3), rgba(250, 112, 154, 0.1));
    color: #fa709a;
    box-shadow: 0 2px 10px rgba(250, 112, 154, 0.3);
}

.category-friends {
    background: linear-gradient(135deg, rgba(255, 195, 113, 0.3), rgba(255, 195, 113, 0.1));
    color: #ffc371;
    box-shadow: 0 2px 10px rgba(255, 195, 113, 0.3);
}

/* Botones de Acción Modernos */
.contact-actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 10px 16px;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition-smooth);
    backdrop-filter: var(--glass-blur);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.edit-btn {
    background: var(--warning-gradient);
    color: white;
    box-shadow: 0 2px 10px rgba(250, 112, 154, 0.3);
}

.edit-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 15px rgba(250, 112, 154, 0.5);
}

.delete-btn {
    background: var(--danger-gradient);
    color: white;
    box-shadow: 0 2px 10px rgba(255, 154, 158, 0.3);
}

.delete-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 4px 15px rgba(255, 154, 158, 0.5);
}

/* Estado Vacío Moderno */
.no-contacts {
    text-align: center;
    padding: 60px 30px;
    color: var(--text-muted);
}

.no-contacts i {
    font-size: 4rem;
    margin-bottom: 20px;
    display: block;
    opacity: 0.5;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* Modal Moderno */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    border: var(--border-glass);
    width: 90%;
    max-width: 700px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-strong);
    overflow: hidden;
    animation: slideUp 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes slideUp {
    from { 
        transform: translateY(50px);
        opacity: 0;
    }
    to { 
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    background: var(--primary-gradient);
    color: white;
    padding: 25px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.modal-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1.8rem;
    cursor: pointer;
    transition: var(--transition-bounce);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: 30px;
    max-height: 70vh;
    overflow-y: auto;
}

/* Formularios Modernos */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition-smooth);
    backdrop-filter: var(--glass-blur);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
    outline: none;
    transform: translateY(-2px);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 576px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Opciones de Exportación */
.export-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}

.export-options .btn {
    margin-bottom: 0;
    font-size: 0.9rem;
    padding: 15px 20px;
}

/* Footer Moderno */
footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px;
    color: var(--text-muted);
    font-size: 0.9rem;
    background: var(--bg-glass);
    backdrop-filter: var(--glass-blur);
    border: var(--border-glass);
    border-radius: var(--border-radius-lg);
}

/* Scrollbar Personalizada */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-card);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-gradient);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-gradient);
}

/* Animaciones de Entrada */
@keyframes slideInFromLeft {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

@keyframes fadeInUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Clases de Animación */
.animate-slide-left {
    animation: slideInFromLeft 0.6s ease-out;
}

.animate-slide-right {
    animation: slideInFromRight 0.6s ease-out;
}

.animate-fade-up {
    animation: fadeInUp 0.5s ease-out;
}

/* Estados de Hover Mejorados */
.contacts-table tr {
    animation: fadeInUp 0.3s ease-out;
}

/* Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Estados de Focus Mejorados */
.btn:focus,
.form-control:focus,
.search-box input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

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

/* Responsive Design Mejorado */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    header {
        padding: 30px 20px;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    .search-section,
    .actions-panel,
    .contacts-section {
        padding: 25px 20px;
    }
    
    .contacts-table {
        font-size: 0.9rem;
    }
    
    .contacts-table th,
    .contacts-table td {
        padding: 12px 15px;
    }
}

@media (max-width: 576px) {
    header h1 {
        font-size: 2rem;
    }
    
    .contacts-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .contact-actions {
        flex-direction: column;
        gap: 5px;
    }
    
    .action-btn {
        width: 100%;
        text-align: center;
    }
}

/* Dark Mode Enhancement */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0a0e1a;
        --bg-secondary: #1a1f2e;
    }
}

/* Estados Interactivos Mejorados */
.btn:active,
.action-btn:active {
    transform: scale(0.98);
}

.search-box input:valid {
    border-color: var(--success-color);
}

/* Micro-interacciones */
.contacts-table tr:hover .contact-category {
    transform: scale(1.05);
}

.modal:hover .modal-content {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

/* Estados de Validación */
.form-control:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
    box-shadow: 0 0 0 2px rgba(67, 233, 123, 0.2);
}

.form-control:invalid:not(:placeholder-shown) {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 2px rgba(255, 154, 158, 0.2);
}