/* ==========================================================================
   ESTILOS GLOBALES Y VARIABLES - EJEMPLO 1
   ========================================================================== */
:root {
    --primary-dark: #0f172a;
    --secondary-dark: #1e293b;
    --accent-gold: #d97706;
    --accent-gold-hover: #b45309;
    --bg-light: #f8fafc;
    --bg-pure: #ffffff;
    --text-main: #334155;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --max-width: 1200px;
    --font-stack: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

body {
    font-family: var(--font-stack);
    line-height: 1.75;
    color: var(--text-main);
    background-color: var(--bg-light);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   HEADER Y NAVEGACIÓN
   ========================================================================== */
header {
    background-color: var(--primary-dark);
    border-bottom: 3px solid var(--accent-gold);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
}

.logo a {
    color: var(--bg-pure);
    text-decoration: none;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.logo span {
    color: var(--accent-gold);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 24px;
}

nav ul li a {
    color: #f1f5f9;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--accent-gold);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
footer {
    background-color: var(--primary-dark);
    color: #f1f5f9;
    padding: 40px 0 20px 0;
    margin-top: 60px;
    border-top: 1px solid var(--secondary-dark);
}

footer .footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
}

footer p {
    font-size: 0.9rem;
    color: #94a3b8;
}

.footer-legal-nav {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
}

.footer-legal-nav li a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.8rem;
    transition: color 0.2s ease;
}

.footer-legal-nav li a:hover {
    color: var(--accent-gold);
}

/* ==========================================================================
   COMPONENTES REUTILIZABLES
   ========================================================================== */
.hero {
    background: linear-gradient(rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.9)), url('https://images.unsplash.com/photo-1450133064473-71024230f91b?auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
    color: var(--bg-pure);
    padding: 90px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.6rem;
    margin-bottom: 20px;
    color: var(--bg-pure);
}

.hero p {
    font-size: 1.15rem;
    max-width: 850px;
    margin: 0 auto 30px auto;
    color: #cbd5e1;
}

.section-padding {
    padding: 60px 0;
    background-color: var(--bg-pure);
}

.section-padding:nth-child(even) {
    background-color: var(--bg-light);
}

h2 {
    font-size: 2rem;
    color: var(--primary-dark);
    margin-bottom: 25px;
}

h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--accent-gold);
    margin-top: 8px;
}

h3 {
    font-size: 1.35rem;
    color: var(--secondary-dark);
    margin: 20px 0 10px 0;
}

p {
    margin-bottom: 15px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background-color: var(--bg-pure);
    padding: 30px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

.gov-disclaimer {
    background-color: #fef3c7;
    border-left: 4px solid var(--accent-gold);
    padding: 20px;
    margin: 25px 0;
    border-radius: 0 6px 6px 0;
}

.gov-disclaimer p {
    font-size: 0.9rem;
    color: #78350f;
    margin-bottom: 0;
    font-weight: 600;
}

.btn-primary {
    display: inline-block;
    background-color: var(--accent-gold);
    color: var(--bg-pure);
    text-decoration: none;
    padding: 12px 30px;
    font-weight: 600;
    border-radius: 4px;
    transition: background-color 0.2s ease;
    border: none;
    cursor: pointer;
}

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

.image-wrapper {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 12px 24px rgba(0,0,0,0.06);
}

.responsive-img {
    width: 100%;
    height: auto;
    display: block;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    background-color: var(--bg-pure);
}

.data-table th, .data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: var(--secondary-dark);
    color: var(--bg-pure);
}

.data-table tr:nth-child(even) {
    background-color: var(--bg-light);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-light);
    color: var(--text-main);
    font-family: var(--font-stack);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-gold);
    background-color: var(--bg-pure);
}

textarea.form-control {
    min-height: 130px;
    resize: vertical;
}

ul.checked-list {
    list-style: none;
    margin: 20px 0;
}

ul.checked-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 12px;
}

ul.checked-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-weight: bold;
}

@media (max-width: 768px) {
    header .container { flex-direction: column; gap: 15px; }
    .grid-2 { grid-template-columns: 1fr; }
}