:root {
    --bg-color: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #334155;
    --brand-blue: #005c8a;
    --nav-bg: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.9);
    --card-border: rgba(0, 0, 0, 0.1);
    /* Overlay mucho más suave (0.5) para ver el libro mejor */
    --overlay-gradient: linear-gradient(to right, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0.3) 100%);
    --ecg-color: #005c8a;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --brand-blue: #38bdf8;
    --nav-bg: #1e293b;
    --card-bg: rgba(30, 41, 59, 0.9);
    --card-border: rgba(255, 255, 255, 0.1);
    --overlay-gradient: linear-gradient(to right, rgba(15, 23, 42, 0.8) 0%, rgba(15, 23, 42, 0.5) 100%);
    --ecg-color: #38bdf8;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-color);
    overflow-x: hidden;
}

/* --- NAVEGACIÓN --- */
.top-nav {
    background-color: var(--nav-bg);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--card-border);
}

.nav-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-weight: 700; font-size: 1.3rem; display: flex; align-items: center; gap: 8px; }
.logo-icon { color: var(--brand-blue); font-size: 1.5rem;}
.logo span { color: var(--brand-blue); }

.nav-links { display: flex; list-style: none; gap: 2rem; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-primary); font-size: 0.95rem; font-weight: 500; transition: color 0.3s; }
.nav-links a:hover { color: var(--brand-blue); }

/* Hamburguesa CSS */
.menu-toggle { display: none; cursor: pointer; flex-direction: column; gap: 5px; }
.bar { width: 25px; height: 3px; background-color: var(--text-primary); transition: all 0.3s ease; }

/* Menú Desplegable (Escritorio) */
.dropdown { position: relative; }
.dropdown-menu {
    display: none; position: absolute; top: 100%; left: 0;
    background: var(--nav-bg); border: 1px solid var(--card-border);
    border-radius: 8px; min-width: 180px; padding: 0.5rem 0; box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}
.dropdown:hover .dropdown-menu { display: block; }
.dropdown-menu a { display: block; padding: 0.7rem 1.2rem; }

.theme-btn {
    background: var(--brand-blue); color: white; border: none;
    padding: 0.5rem 1rem; border-radius: 20px; font-size: 0.85rem; cursor: pointer; font-weight: 600;
}

/* --- HERO SECTION --- */
.hero-section {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: url(../img/photo-1456513080510-7bf3a84b82f8.avif) center/cover no-repeat;
    padding: 3rem 0;
}

.bg-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--overlay-gradient); z-index: 1;
}

.ecg-container {
    position: absolute; top: 45%; left: 0; width: 100%;
    z-index: 2; opacity: 0.2; pointer-events: none;
}
.ecg-line {
    fill: none; stroke: var(--ecg-color); stroke-width: 4;
    stroke-dasharray: 2000; animation: drawEcg 7s linear infinite;
}

@keyframes drawEcg {
    0% { stroke-dashoffset: 2000; }
    100% { stroke-dashoffset: -2000; }
}

/* --- CONTENIDO --- */
.content-wrapper {
    position: relative; z-index: 10;
    width: 90%; max-width: 1200px; margin: 0 auto;
    display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 4rem; align-items: center;
}

.hero-text h1 { font-size: 3.5rem; line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -1.5px; }
.hero-text p { font-size: 1.25rem; color: var(--text-secondary); line-height: 1.6; max-width: 500px; }

.hero-cards { display: flex; flex-direction: column; gap: 1.5rem; }

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    padding: 2rem; border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}
.card:hover { transform: translateY(-5px); border-color: var(--brand-blue); box-shadow: 0 15px 35px rgba(0,92,138,0.1); }

.card-header { display: flex; align-items: center; gap: 15px; margin-bottom: 1rem; }
.card-header h2 { font-size: 1.5rem; }
.card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 1.5rem; }
.card-footer { color: var(--brand-blue); font-weight: 700; font-size: 0.9rem; letter-spacing: 0.5px;}

/* --- RESPONSIVE --- */

@media (max-width: 992px) {
    .content-wrapper { grid-template-columns: 1fr; text-align: center; gap: 3rem; }
    .hero-text h1 { font-size: 2.8rem; }
    .hero-text p { margin: 0 auto; }
    .hero-cards { max-width: 500px; margin: 0 auto; width: 100%; }
}

@media (max-width: 768px) {
    .menu-toggle { display: flex; z-index: 1001; }
    
    .nav-links {
        position: fixed; top: 0; right: -100%; width: 80%; height: 100vh;
        background-color: var(--nav-bg); flex-direction: column;
        justify-content: center; transition: 0.4s; box-shadow: -10px 0 20px rgba(0,0,0,0.1);
        z-index: 1000;
    }

    .nav-links.active { right: 0; }

    /* Animación hamburguesa a X */
    .menu-toggle.is-active .bar:nth-child(2) { opacity: 0; }
    .menu-toggle.is-active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .menu-toggle.is-active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

    .hero-text h1 { font-size: 2.2rem; }
    .hero-section { background-position: 70% center; } /* Ajuste de foto para móvil */
}

/* --- FOOTER --- */
.site-footer {
    background-color: var(--nav-bg);
    border-top: 1px solid var(--card-border);
    padding: 4rem 0 0 0;
    margin-top: 0rem;
}

.footer-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.brand-col .logo {
    margin-bottom: 1rem;
}

.brand-col .disclaimer {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 400px;
}

.links-col ul {
    list-style: none;
}

.links-col ul li {
    margin-bottom: 0.8rem;
}

.links-col ul a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color 0.2s;
}

.links-col ul a:hover {
    color: var(--brand-blue);
}

.footer-bottom {
    text-align: center;
    padding: 1.5rem 0;
    border-top: 1px solid var(--card-border);
    background-color: rgba(0, 0, 0, 0.02); /* Un ligerísimo sombreado para separarlo */
}

[data-theme="dark"] .footer-bottom {
    background-color: rgba(255, 255, 255, 0.02);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Responsive del Footer */
@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: left;
    }
    
    .site-footer {
        padding: 3rem 0 0 0;
    }
}

/* --- PÁGINAS LEGALES --- */
.legal-section {
    min-height: calc(100vh - 70px);
    padding: 4rem 0;
    background-color: var(--bg-color);
}

.legal-content {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 3rem 4rem;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.02);
}

.legal-content h1 {
    font-size: 2.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.legal-content .last-update {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    display: block;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.legal-content h2 {
    font-size: 1.3rem;
    color: var(--brand-blue);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.legal-content p, .legal-content ul {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.2rem;
}

.legal-content ul {
    padding-left: 1.5rem;
}

.legal-content li {
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .legal-content { padding: 2rem 1.5rem; width: 90%; }
    .legal-content h1 { font-size: 1.8rem; }
}