:root {
    --red: #d60f0f;
    --dark-bg: #111111;
    --card-bg: #1c1c1c;
    --text-light: #ffffff;
    --text-gray: #b3b3b3;
    --border-subtle: #282828;
}

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

body { 
    background-color: var(--dark-bg); 
    color: var(--text-light); 
    line-height: 1.6; 
}

header { 
    background-color: #000; 
    text-align: center; 
}

.banner-img { 
    max-width: 100%; 
    height: auto; 
    display: block; 
    margin: 0 auto; 
}

/* BARRA DE NAVEGACIÓN */
.navbar { 
    background-color: #0d0d0d; 
    border-top: 2px solid var(--red); 
    border-bottom: 2px solid var(--red); 
    position: sticky; 
    top: 0; 
    z-index: 1000; 
}

.nav-container { 
    max-width: 1100px; 
    margin: 0 auto; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    list-style: none; 
    flex-wrap: wrap; 
}

.nav-container li a { 
    display: block; 
    padding: 15px 20px; 
    color: var(--text-light); 
    text-decoration: none; 
    font-weight: bold; 
    font-size: 0.95rem; 
    text-transform: uppercase; 
    transition: 0.3s; 
}

.nav-container li a:hover, 
.nav-container li a.active { 
    background-color: var(--red); 
}

.btn-nav-cita { 
    background-color: var(--red); 
    border-radius: 4px; 
    margin: 5px; 
}

/* ENCABEZADO */
.page-header { 
    background: #161616; 
    padding: 40px 20px; 
    text-align: center; 
    border-bottom: 1px solid var(--border-subtle); 
}

.page-header h1 { 
    font-size: 2.2rem; 
    color: #fff; 
    margin-bottom: 10px; 
}

.page-header h1 span { 
    color: var(--red); 
}

.page-header p { 
    color: var(--text-gray); 
    font-size: 1.05rem; 
}

/* CONTENEDOR Y FORMULARIO */
.container { 
    max-width: 800px; 
    margin: 0 auto; 
    padding: 40px 20px; 
}

.cita-card { 
    background-color: var(--card-bg); 
    padding: 35px; 
    border-radius: 8px; 
    border-top: 4px solid var(--red); 
    box-shadow: 0 4px 15px rgba(0,0,0,0.4);
}

.cita-card h2 { 
    color: #fff; 
    margin-bottom: 25px; 
    font-size: 1.5rem; 
    border-bottom: 1px solid var(--border-subtle); 
    padding-bottom: 10px; 
}

.cita-form { 
    display: flex; 
    flex-direction: column; 
    gap: 18px; 
}

.form-row { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 18px; 
}

@media (max-width: 600px) {
    .form-row { 
        grid-template-columns: 1fr; 
    }
}

.form-group { 
    display: flex; 
    flex-direction: column; 
    gap: 6px; 
}

.form-group label { 
    font-size: 0.85rem; 
    color: var(--text-gray); 
    font-weight: bold; 
}

.form-group input, 
.form-group select, 
.form-group textarea {
    background-color: #111;
    border: 1px solid #333;
    color: #fff;
    padding: 12px;
    border-radius: 4px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s;
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus { 
    border-color: var(--red); 
}

/* ICONO CALENDARIO MODO OSCURO */
::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}

.btn-submit-cita {
    background-color: var(--red);
    color: #fff;
    border: none;
    padding: 15px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 1.05rem;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 10px;
}

.btn-submit-cita:hover { 
    background-color: #b00c0c; 
}

/* BOTÓN WHATSAPP */
.whatsapp-float { 
    position: fixed; 
    width: 60px; 
    height: 60px; 
    bottom: 25px; 
    right: 25px; 
    background-color: #25d366; 
    color: #fff; 
    border-radius: 50px; 
    text-align: center; 
    font-size: 30px; 
    box-shadow: 2px 2px 10px rgba(0,0,0,0.5); 
    z-index: 10000; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    text-decoration: none; 
    transition: transform 0.3s; 
}

.whatsapp-float:hover { 
    transform: scale(1.1); 
}

footer { 
    text-align: center; 
    padding: 20px; 
    background-color: #000; 
    font-size: 0.9rem; 
    color: var(--text-gray); 
}