* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #0F172A;
    color: #F8F9FA;
    line-height: 1.6;
    padding-bottom: 2rem;
}

header {
    background-color: #1E293B;
    color: #FFFFFF;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

header p {
    font-weight: bold;
    font-size: 1.2rem;
    letter-spacing: 0.5px;
}
nav {
    display: flex;
    align-items: center;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}

nav a {
    color: #E2E8F0;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #38BDF8;
}
#btn-menu {
    display: none;
}
.hamburguesa {
    background-color: #334155;
    color: #F8F9FA;
    border: 1px solid #475569;
    border-radius: 6px;
    padding: 6px 12px;
    font: inherit;
    font-weight: bold;
    cursor: pointer;
    width: auto;
    margin: 0;
}


main {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

h1, h2, h3 {
    color: #38BDF8;
    margin-bottom: 0.8rem;
}

.tarjeta {
    background-color: #1E293B;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    color: #F8F9FA;
}

.tarjeta hr.separador {
    border: none;
    border-top: 1px solid #334155;
    margin: 1.5rem 0;
}

.tarjeta form label {
    display: block;
    font-weight: bold;
    margin: 12px 0 4px;
    color: #E2E8F0;
}

.tarjeta form input,
.tarjeta form textarea {
    width: 100%;
    display: block;
    padding: 10px;
    border: 1px solid #334155;
    border-radius: 6px;
    box-sizing: border-box;
    font: inherit;
    background-color: #0F172A;
    color: #F8F9FA;
    resize: vertical; 
}

.tarjeta form input::placeholder,
.tarjeta form textarea::placeholder {
    color: #64748B;
}

body.claro .tarjeta hr.separador {
    border-top-color: #CBD5E1;
}

body.claro .tarjeta form label {
    color: #334155;
}

body.claro .tarjeta form input,
body.claro .tarjeta form textarea {
    background-color: #FFFFFF;
    border-color: #CBD5E1;
    color: #0F172A;
}

button {
    background-color: #25D366;
    color: #FFFFFF;
    border: none;
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    width: 100%;
    margin-top: 1rem;
}

button:hover {
    background-color: #1EBE5D;
    transform: translateY(-1px);
}

.aviso {
    display: none;
    margin-top: 14px;
    padding: 10px 14px;
    border-radius: 6px;
    font-weight: bold;
}

.aviso.error {
    display: block;
    background-color: #f8d7da;
    color: #842029;
    border-left: 4px solid #dc3545;
}

.aviso.exito {
    display: block;
    background-color: #d1e7dd;
    color: #0f5132;
    border-left: 4px solid #198754;
}

footer {
    text-align: center;
    padding: 1.5rem;
    background-color: #1E293B;
    color: #94A3B8;
    margin-top: 3rem;
}

.boton-modo {
    background-color: #ff8f3c;
    color: #1a1208;
    border: none;
    border-radius: 20px;
    padding: 8px 18px;
    font: inherit;
    font-weight: bold;
    cursor: pointer;
    width: auto;
    margin-top: 0;
}

body.claro {
    background-color: #F8F9FA;
    color: #0F172A;
}

body.claro header {
    background-color: #1E293B;
    color: #ffffff;
}

body.claro header p {
    color: #FFFFFF;
}

body.claro nav a {
    color: #E2E8F0;
}
body.claro .hamburguesa {
    background-color: #334155;
    color: #FFFFFF;
    border-color: #475569;
}

body.claro h1{
    color: #d6d9e0;
} 
body.claro h2, 
body.claro h3 {
    color: #0F172A;
}

body.claro .tarjeta {
    background-color: #ffffff;
    border-color: #E2E8F0;
    color: #0F172A;
}

body.claro article {
    background-color: #F1F5F9;
    border-color: #CBD5E1;
}

body.claro footer {
    background-color: #1E293B;
    color: #94A3B8;
}
.btn-cerrar{
    background: none !important;
    padding: 0 !important;
    margin: 0 !important;
    color: #eb1741;
}
@media (max-width: 600px) {
    header {
        flex-direction: column; 
        gap: 1rem;
        padding: 1rem; 
        text-align: center;
    }

    nav {
        width: 100%;
        flex-direction: column;
        align-items: center;
    }

    #btn-menu {
        display: block;
        margin: 0 auto 10px auto;
    }

    nav ul {
        display: none;
        flex-direction: column; 
        align-items: center;
        gap: 0.8rem;
        padding-top: 12px;
        width: 100%;
    }
    nav ul.abierto {
        display: flex;
    }
}