/* 
 * 🎨 Estilos Modernos para Autenticación - Control de Gastos v2.0
 * Diseño responsive y atractivo para login, registro, recuperación
 */

/* ===========================================
   🌐 VARIABLES CSS GLOBALES
   =========================================== */
:root {
    /* Paleta de colores principal */
    --primary-color: #667eea;
    --primary-dark: #764ba2;
    --secondary-color: #f093fb;
    --success-color: #4CAF50;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --info-color: #2196F3;
    
    /* Colores neutros */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --medium-gray: #6c757d;
    --dark-gray: #343a40;
    --border-color: #e0e0e0;
    
    /* Tipografía */
    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-xl: 24px;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Bordes y sombras */
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --box-shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.15);
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--dark-gray);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
}

/* ===========================================
   🏠 CONTENEDOR PRINCIPAL DE AUTENTICACIÓN
   =========================================== */
.auth-container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
    padding: var(--spacing-sm);
}

.auth-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    transition: all var(--transition-normal);
}

.auth-card:hover {
    box-shadow: var(--box-shadow-hover);
    transform: translateY(-2px);
}

/* Efecto de brillo sutil */
.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
}

.auth-card:hover::before {
    left: 100%;
}

/* ===========================================
   📝 ENCABEZADO
   =========================================== */
.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.auth-header h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-header p {
    color: var(--medium-gray);
    font-size: var(--font-size-small);
    margin-bottom: 0;
}

/* Línea decorativa bajo el título */
.auth-header::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

/* ===========================================
   📋 FORMULARIOS
   =========================================== */
.form-label {
    font-weight: 500;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: all var(--transition-fast);
    background: var(--white);
    position: relative;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.form-control:hover {
    border-color: var(--primary-color);
}

.form-control::placeholder {
    color: var(--medium-gray);
    font-style: italic;
}

/* Efecto de campo flotante */
.form-group {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.form-group.floating-label .form-control:focus + .form-label,
.form-group.floating-label .form-control:not(:placeholder-shown) + .form-label {
    transform: translateY(-25px) scale(0.8);
    color: var(--primary-color);
}

/* ===========================================
   🎛️ CHECKBOXES Y CONTROLES
   =========================================== */
.form-check {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xs) 0;
}

.form-check-input {
    width: 18px;
    height: 18px;
    margin-right: var(--spacing-xs);
    accent-color: var(--primary-color);
    cursor: pointer;
}

.form-check-label {
    font-size: var(--font-size-small);
    color: var(--medium-gray);
    cursor: pointer;
    user-select: none;
}

/* ===========================================
   🔲 BOTONES
   =========================================== */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    color: var(--white);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn.w-100 {
    width: 100%;
    margin-bottom: var(--spacing-md);
}

/* Efecto de ondas en botones */
.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transition: all var(--transition-normal);
    transform: translate(-50%, -50%);
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

/* ===========================================
   ⚠️ ALERTAS Y MENSAJES
   =========================================== */
.alert {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
    border: none;
    font-size: var(--font-size-small);
    font-weight: 500;
    position: relative;
    animation: slideInDown 0.3s ease;
}

.alert-success {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
    color: #721c24;
    border-left: 4px solid var(--danger-color);
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1, #bee5eb);
    color: #0c5460;
    border-left: 4px solid var(--info-color);
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd, #ffeaa7);
    color: #856404;
    border-left: 4px solid var(--warning-color);
}

/* Iconos en alertas */
.alert::before {
    content: '⚠️';
    margin-right: var(--spacing-xs);
    font-size: var(--font-size-large);
}

.alert-success::before {
    content: '✅';
}

.alert-danger::before {
    content: '❌';
}

.alert-info::before {
    content: 'ℹ️';
}

/* ===========================================
   📎 COMPONENTES ADICIONALES
   =========================================== */

/* Enlaces adicionales en el footer de autenticación */
.auth-links {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-small);
    color: var(--medium-gray);
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-fast);
}

.auth-links a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Iconos para alertas */
.alert-icon {
    font-size: var(--font-size-large);
    margin-right: var(--spacing-xs);
    display: inline-block;
    vertical-align: middle;
}

/* Mejoras para centrado de contenido en alertas de éxito */
.alert.alert-success {
    text-align: center;
}

/* Estilo especial para botones dentro de alertas */
.alert .btn {
    margin-top: var(--spacing-sm);
    display: inline-block;
}

/* ===========================================
   🔗 PIE DE PÁGINA
   =========================================== */
.auth-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-small);
    transition: all var(--transition-fast);
    position: relative;
}

.auth-footer a:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

.auth-footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

.auth-footer a:hover::after {
    width: 100%;
}

.auth-footer .mt-2 {
    margin-top: var(--spacing-xs) !important;
    color: var(--medium-gray);
    font-size: var(--font-size-small);
}

/* ===========================================
   📱 RESPONSIVE DESIGN
   =========================================== */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-xs);
    }
    
    .auth-container {
        padding: var(--spacing-xs);
    }
    
    .auth-card {
        padding: var(--spacing-lg);
    }
    
    .auth-header h1 {
        font-size: 22px;
    }
    
    .form-control {
        padding: 12px var(--spacing-sm);
        font-size: 16px; /* Evita zoom en iOS */
    }
    
    .btn {
        padding: 14px var(--spacing-md);
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    .auth-card {
        padding: var(--spacing-md);
        margin: var(--spacing-xs);
    }
    
    .auth-header {
        margin-bottom: var(--spacing-md);
    }
    
    .auth-header h1 {
        font-size: 20px;
    }
}

/* ===========================================
   ✨ ANIMACIONES
   =========================================== */
@keyframes slideInDown {
    0% {
        transform: translateY(-20px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes fadeInScale {
    0% {
        transform: scale(0.8);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.auth-card {
    animation: fadeInScale 0.5s ease;
}

/* ===========================================
   🎨 EFECTOS ESPECIALES
   =========================================== */

/* Partículas de fondo */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.1) 1px, transparent 1px),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 1px, transparent 1px),
        radial-gradient(circle at 40% 60%, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px, 30px 30px, 70px 70px;
    animation: particleFloat 20s linear infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes particleFloat {
    0% { transform: translateX(0) translateY(0); }
    33% { transform: translateX(30px) translateY(-30px); }
    66% { transform: translateX(-20px) translateY(20px); }
    100% { transform: translateX(0) translateY(0); }
}

/* Modo oscuro (futuro) */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1a1a1a;
        --light-gray: #2d2d2d;
        --medium-gray: #8e8e8e;
        --dark-gray: #f0f0f0;
        --border-color: #404040;
    }
}

/* ===========================================
   🔧 UTILIDADES
   =========================================== */
.text-center { text-align: center; }
.mt-2 { margin-top: var(--spacing-xs); }
.mb-4 { margin-bottom: var(--spacing-md); }
.w-100 { width: 100%; }

/* Loading spinner para formularios */
.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    transform: translate(-50%, -50%);
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}