:root {
    --primary: #1eaa61;      /* Verde principal (manteniendo identidad WhatsApp) */
    --primary-dark: #00442a; /* Verde oscuro elegante (tu excelente propuesta) */
    --primary-light: #4ac57c; /* Verde claro para acentos */
    --secondary: #2d5a7c;    /* Azul para complementos */
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --light-gray: #e9ecef;
    --danger: #dc3545;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e2e8f0 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
}

/* Fondo con el nuevo verde oscuro */
body::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 40%;
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    z-index: -1;
    border-radius: 0 0 50% 50% / 0 0 30% 30%;
}

.login-container {
    width: 100%;
    max-width: 450px;
    z-index: 1;
}

.login-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    color: white;
    padding: 35px 20px;
    text-align: center;
    position: relative;
}

.login-header .logo {
    font-size: 3rem;
    margin-bottom: 15px;
}

.login-header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.login-header h2 {
    font-size: 1.1rem;
    font-weight: 400;
    opacity: 0.9;
}

.login-header h2 .bi-whatsapp {
    color: white;
    margin-right: 8px;
}

.login-header::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: white;
    opacity: 0.7;
}

.login-body {
    padding: 35px;
}

.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--dark);
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--light-gray);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s;
    background-color: #fafbfc;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(30, 170, 97, 0.15);
    background-color: white;
}

.btn {
    display: block;
    width: 100%;
    padding: 14px;
    background: linear-gradient(to right, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 10px rgba(30, 170, 97, 0.25);
}

.btn:hover {
    background: linear-gradient(to right, var(--primary-dark), #002c1c);
    box-shadow: 0 6px 15px rgba(0, 68, 42, 0.35);
}

.error-message {
    color: var(--danger);
    background: #fef5f5;
    border: 1px solid #fde2e2;
    border-radius: 8px;
    padding: 14px;
    margin-bottom: 25px;
    text-align: center;
    font-size: 0.95rem;
}

.footer-text {
    text-align: center;
    margin-top: 30px;
    color: var(--gray);
    font-size: 0.9rem;
    border-top: 1px solid var(--light-gray);
    padding-top: 20px;
}

/* Ajustes responsivos */
@media (max-width: 480px) {
    .login-container {
        max-width: 100%;
    }
    
    .login-body {
        padding: 25px;
    }
    
    body::before {
        height: 35%;
    }
    
    .login-header .logo {
        font-size: 2.5rem;
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
}