/* ==========================================================================
   Variables Globales y Reset
   ========================================================================== */
:root {
    --primary-color: #1a1a1a;    /* Negro Corporativo de Lujo */
    --accent-color: #d4af37;     /* Dorado Alta Costura */
    --bg-light: #f9f9f9;
    --text-dark: #333333;
    --text-light: #ffffff;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

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

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

/* Header & Footer */
.main-header, .main-footer {
    background-color: var(--primary-color);
    color: var(--text-light);
    text-align: center;
    padding: 40px 20px;
}
.main-header h1 {
    color: var(--accent-color);
    margin-bottom: 10px;
}
.section-divider {
    border: 0;
    height: 1px;
    background: #e0e0e0;
    margin: 60px 0;
}

/* ==========================================================================
   ACTIVIDAD 1: Galería Multimedia (Flexbox / Grid + Efectos Hover)
   ========================================================================== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.destination-card {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.responsive-img {
    width: 100%;
    display: block;
    height: 400px;
    object-fit: cover;
    /* Transición suave solicitada de 0.4s */
    transition: transform 0.4s ease-in-out; 
}

.card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
    color: var(--text-light);
    padding: 20px;
    /* Opacidad inicial variable según interacción */
    opacity: 0.85;
    transition: opacity 0.4s ease;
}

.card-overlay h3 {
    color: var(--accent-color);
    margin-bottom: 5px;
}

/* Interacción Dinámica (:hover) */
.destination-card:hover .responsive-img {
    transform: scale(1.05); /* Escala suave solicitada */
}

.destination-card:hover .card-overlay {
    opacity: 1; /* Altera la opacidad al pasar el cursor */
}

/* ==========================================================================
   ACTIVIDAD 2: Tabla Avanzada (Estructurada y Accesible)
   ========================================================================== */
.table-container {
    overflow-x: auto; /* Garantiza adaptabilidad móvil */
    margin-top: 30px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--text-light);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

caption {
    font-size: 0.95rem;
    font-style: italic;
    padding: 10px;
    color: #666;
    text-align: left;
}

thead th {
    background-color: var(--primary-color);
    color: var(--accent-color);
    padding: 15px;
    font-weight: 600;
    text-align: left;
    border-bottom: 3px solid var(--accent-color);
}

tbody th, tbody td {
    padding: 15px;
    border-bottom: 1px solid #e0e0e0;
}

tbody th {
    background-color: #f0f0f0;
    font-weight: 600;
}

.price {
    font-weight: bold;
    color: #c99212;
}

/* Criterio: Coloración alterna con :nth-child(even) */
tbody tr:nth-child(even) {
    background-color: #fcf8ee;
}

tbody tr:hover {
    background-color: #f1ebd9; /* Feedback visual */
}

/* ==========================================================================
   ACTIVIDAD 3: Formulario Seguro y Adaptativo
   ========================================================================== */
.booking-form {
    background-color: var(--text-light);
    padding: 40px;
    border-radius: 8px;
    max-width: 650px;
    margin: 30px auto 0 auto;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

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

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

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="date"],
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #cccccc;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 5px rgba(212, 175, 55, 0.4);
}

/* Estilo del Slider input[type="range"] */
.form-group input[type="range"] {
    width: 100%;
    accent-color: var(--accent-color);
}

.btn-submit {
    display: block;
    width: 100%;
    background-color: var(--primary-color);
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    padding: 15px;
    font-size: 1.1rem;
    font-weight: bold;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    background-color: var(--accent-color);
    color: var(--primary-color);
}