/* ========================================
   TiendAPP - Estilos Principales
   ======================================== */

:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --danger-color: #f44336;
    --warning-color: #FF9800;
    --success-color: #4CAF50;
    --dark-color: #333;
    --light-color: #f5f5f5;
    --border-color: #ddd;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* ========================================
   HEADER
   ======================================== */
header {
    background: white;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

header h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.user-info {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* ========================================
   BOTONES
   ======================================== */
.btn-primary, .btn-secondary, .btn-logout, .btn-admin, .btn-back {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background: #45a049;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.btn-secondary:hover {
    background: #1976D2;
}

.btn-logout {
    background: var(--danger-color);
    color: white;
}

.btn-logout:hover {
    background: #da190b;
}

.btn-admin {
    background: var(--warning-color);
    color: white;
}

.btn-back {
    background: #666;
    color: white;
}

.btn-block {
    width: 100%;
    margin: 10px 0;
}

/* ========================================
   PÁGINA DE LOGIN
   ======================================== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.login-header p {
    color: #666;
}

.login-form {
    margin-top: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
}

.alert {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-error {
    background: #ffebee;
    color: #c62828;
    border: 1px solid #ef5350;
}

.alert-success {
    background: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #66bb6a;
}

.login-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

/* ========================================
   PANEL PRINCIPAL
   ======================================== */
main {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow);
}

.welcome-section {
    text-align: center;
    margin-bottom: 40px;
}

.welcome-section h2 {
    font-size: 2rem;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.buttons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.button-card {
    position: relative;
}

.btn-main {
    width: 100%;
    padding: 40px 20px;
    border: none;
    border-radius: 16px;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.btn-main:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.btn-main .icon {
    font-size: 3rem;
}

.btn-compra {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.btn-venta {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.btn-rebu {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

/* Submenu de VENTA */
.venta-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.submenu {
    display: none;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.submenu.active {
    display: flex;
}

.btn-submenu {
    width: 100%;
    padding: 20px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

.btn-submenu:hover {
    transform: translateX(5px);
}

.btn-submenu:nth-child(1) {
    background: linear-gradient(135deg, #FA8BFF 0%, #2BD2FF 100%);
}

.btn-submenu:nth-child(2) {
    background: linear-gradient(135deg, #FFA8A8 0%, #FCFF00 100%);
}

/* ========================================
   RESUMEN RÁPIDO
   ======================================== */
.quick-summary {
    margin-top: 40px;
}

.quick-summary h3 {
    margin-bottom: 20px;
    color: var(--dark-color);
}

#summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.summary-card {
    padding: 20px;
    border-radius: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: var(--shadow);
}

.summary-card.balance {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.summary-label {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 10px;
}

.summary-value {
    font-size: 1.8rem;
    font-weight: bold;
}

/* ========================================
   FORMULARIO DE MOVIMIENTOS
   ======================================== */
.form-movimiento {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    position: relative;
}

.currency {
    position: absolute;
    right: 15px;
    top: 42px;
    font-weight: bold;
    color: #666;
}

.total-ambos {
    padding: 15px;
    background: var(--light-color);
    border-radius: 8px;
    text-align: center;
    margin: 15px 0;
    font-size: 1.2rem;
}

.cambio-display {
    padding: 20px;
    background: #e8f5e9;
    border: 2px solid var(--success-color);
    border-radius: 12px;
    text-align: center;
    margin: 15px 0;
}

.cambio-label {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 5px;
}

.cambio-valor {
    font-size: 2rem;
    font-weight: bold;
    color: var(--success-color);
}

.form-actions {
    margin-top: 30px;
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .user-info {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .buttons-grid {
        grid-template-columns: 1fr;
    }
    
    #summary-cards {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   UTILIDADES
   ======================================== */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}