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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

/* Contenedor principal */
.login-container {
    width: 100%;
    max-width: 400px;
    padding: 0;
}

/* Caja de login */
.login-box {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 100%;
}

.login-box h2 {
    margin-bottom: 1.5rem;
    color: #2c3e50;
    font-size: 1.5rem;
    font-weight: 600;
}

/* Formulario */
.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: #2c3e50;
}

.form-group input {
    width: 100%;
    padding: 14px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: all 0.3s ease;
    background-color: #fafafa;
}

.form-group input:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
    background-color: white;
}

/* Botón */
button {
    width: 100%;
    padding: 15px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    margin-top: 0.5rem;
    min-height: 50px;
}

button:hover, button:active {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* Alertas */
.alert {
    padding: 12px;
    margin-bottom: 1.25rem;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-radius: 6px;
    font-size: 0.9rem;
    text-align: left;
}

/* Enlace de registro */
.register-link {
    margin-top: 1.5rem;
    font-size: 0.9rem;
}

.register-link a {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.register-link a:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* MEDIA QUERIES ESPECÍFICAS PARA MÓVILES */

/* Móviles pequeños (hasta 375px) */
@media (max-width: 375px) {
    body {
        padding: 0.75rem;
        align-items: flex-start;
        padding-top: 2rem;
    }
    
    .login-box {
        padding: 1.5rem 1.25rem;
        border-radius: 10px;
    }
    
    .login-box h2 {
        font-size: 1.3rem;
        margin-bottom: 1.25rem;
    }
    
    .form-group input {
        padding: 12px 10px;
        font-size: 0.95rem;
    }
    
    button {
        padding: 14px;
        font-size: 0.95rem;
        min-height: 48px;
    }
    
    .alert {
        padding: 10px;
        font-size: 0.85rem;
    }
}

/* Móviles medianos (376px - 480px) */
@media (min-width: 376px) and (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    .login-box {
        padding: 1.75rem 1.5rem;
    }
    
    .login-box h2 {
        font-size: 1.4rem;
    }
}

/* Tablets (481px - 768px) */
@media (min-width: 481px) and (max-width: 768px) {
    .login-container {
        max-width: 420px;
    }
    
    .login-box {
        padding: 2.5rem 2rem;
    }
}

/* Dispositivos con pantalla táctil */
@media (hover: none) {
    button:hover {
        transform: none;
    }
    
    button:active {
        transform: scale(0.98);
        background-color: #2471a3;
    }
}

/* Orientación landscape en móviles */
@media (max-height: 600px) and (max-width: 768px) {
    body {
        align-items: flex-start;
        padding-top: 1rem;
        min-height: auto;
    }
    
    .login-box {
        padding: 1.5rem;
        margin-top: 1rem;
    }
    
    .login-box h2 {
        font-size: 1.3rem;
        margin-bottom: 1rem;
    }
    
    .form-group {
        margin-bottom: 1rem;
    }
}

/* Para dispositivos con notch */
@supports(padding: max(0px)) {
    .login-box {
        padding-left: max(1.25rem, env(safe-area-inset-left));
        padding-right: max(1.25rem, env(safe-area-inset-right));
    }
    
    body {
        padding-left: max(0.75rem, env(safe-area-inset-left));
        padding-right: max(0.75rem, env(safe-area-inset-right));
    }
}

/* Mejora de accesibilidad para enfoque */
button:focus-visible,
.btn-login:focus-visible,
.form-group input:focus-visible {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}