/* =========================================
   VARIABLES Y REINICIO
   ========================================= */
:root {
    --bg: #ffffff; --fg: #000000; --muted: #666666; --accent: #d4af37;
    --border: #f0f0f0; --transition: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    --nav-height: 70px;
}
body.dark-mode {
    --bg: #0a0a0a; --fg: #ffffff; --muted: #888888; --border: #1a1a1a;
}

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

body { 
    font-family: 'Inter', sans-serif; 
    background: var(--bg); 
    color: var(--fg); 
    transition: background 0.4s ease;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 1.5rem; }

/* =========================================
   NAVEGACIÓN (CORRECCIÓN RESPONSIVA)
   ========================================= */
.tab-nav {
    position: sticky; top: 0; background: var(--bg); z-index: 1000;
    border-bottom: 1px solid var(--border); padding: 0.8rem 0;
    transition: background 0.4s;
}
.nav-flex { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }

.nav-logo { 
    height: 45px; 
    width: auto;
    mix-blend-mode: multiply; 
    transition: transform 0.3s ease;
}
body.dark-mode .nav-logo { filter: invert(1); mix-blend-mode: screen; }

.tabs { 
    display: flex; 
    gap: 0.5rem; 
    overflow-x: auto; /* Permite scroll horizontal en móviles */
    scrollbar-width: none; /* Oculta scroll en Firefox */
    -webkit-overflow-scrolling: touch;
}
.tabs::-webkit-scrollbar { display: none; } /* Oculta scroll en Chrome/Safari */

.tab-btn {
    background: none; border: none; color: var(--muted); cursor: pointer;
    font-size: 0.75rem; text-transform: uppercase; font-weight: 700;
    padding: 0.6rem 1rem; transition: 0.3s;
    white-space: nowrap; /* Evita que el texto se rompa */
}
.tab-btn.active { color: var(--fg); position: relative; }
.tab-btn.active::after {
    content: ''; position: absolute; bottom: 0; left: 20%; width: 60%;
    height: 2px; background: var(--fg);
}

/* =========================================
   MODO OSCURO SWITCH
   ========================================= */
.mode-toggle { position: fixed; bottom: 2rem; left: 1.5rem; z-index: 1100; }
.checkbox { opacity: 0; position: absolute; }
.label {
    background: #111; display: flex; align-items: center; justify-content: space-between;
    padding: 5px; border-radius: 50px; position: relative; height: 26px; width: 50px; cursor: pointer;
    border: 1px solid var(--border);
}
.ball {
    background: #fff; border-radius: 50%; position: absolute; top: 2px; left: 2px;
    height: 20px; width: 20px; transition: transform 0.3s cubic-bezier(0.7, 0, 0.3, 1);
}
.checkbox:checked + .label .ball { transform: translateX(24px); }

/* =========================================
   HERO Y CONTENIDO
   ========================================= */
.hero { text-align: center; padding: 4rem 0; }
.hero-title { font-size: clamp(2.5rem, 8vw, 4.5rem); font-weight: 900; letter-spacing: -2px; line-height: 1; }
.hero-tagline { color: var(--muted); font-style: italic; margin: 1rem 0 2rem; font-size: 1.1rem; }

.stats { display: flex; justify-content: center; gap: 2rem; margin-bottom: 2.5rem; flex-wrap: wrap; }
.stat-item { font-size: 0.85rem; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }
.stat-item strong { color: var(--fg); font-size: 1.4rem; display: block; }

.hero-main-img { border-radius: 16px; overflow: hidden; box-shadow: 0 20px 40px rgba(0,0,0,0.1); }
.hero-main-img img { width: 100%; display: block; filter: grayscale(100%); transition: 0.8s var(--transition); }
.hero-main-img:hover img { filter: grayscale(0); transform: scale(1.02); }

/* GRIDS RESPONSIVOS */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 3rem; align-items: center; padding: 4rem 0; }
.section-title { font-size: 2.5rem; margin-bottom: 1.5rem; letter-spacing: -1px; }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.service-card { 
    background: var(--card); padding: 2.5rem; border-radius: 16px; 
    border: 1px solid var(--border); transition: 0.3s;
}
.service-card:hover { border-color: var(--muted); transform: translateY(-5px); }
.service-card h3 { margin-bottom: 1rem; letter-spacing: 1px; }

/* =========================================
   FOOTER Y BOTONES
   ========================================= */
.btn-primary, .btn-outline {
    display: inline-block; padding: 1rem 2rem; border-radius: 50px; 
    font-weight: 700; text-decoration: none; transition: 0.3s; font-size: 0.9rem;
}
.btn-primary { background: var(--fg); color: var(--bg); }
.btn-outline { border: 2px solid var(--fg); color: var(--fg); }
.btn-primary:hover { opacity: 0.8; transform: translateY(-2px); }

.wpp-float {
    position: fixed; bottom: 2rem; right: 1.5rem; background: #25d366;
    color: white; width: 55px; height: 55px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; box-shadow: 0 8px 20px rgba(37,211,102,0.3); z-index: 1000;
    text-decoration: none; transition: 0.3s;
}
.wpp-float:hover { transform: scale(1.1) rotate(10deg); }

/* ANIMACIONES */
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeInUp 0.6s ease; }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.reveal { opacity: 0; transform: translateY(30px); transition: 0.8s var(--transition); }
.reveal.active { opacity: 1; transform: translateY(0); }

/* MEDIA QUERIES PARA CELULARES */
@media (max-width: 600px) {
    .nav-flex { flex-direction: column; padding: 0.5rem 0; }
    .hero { padding: 2.5rem 0; }
    .stats { gap: 1.5rem; }
    .section-title { font-size: 2rem; }
    .grid-2 { gap: 2rem; }
    .mode-toggle { top: 1.2rem; bottom: auto; left: auto; right: 1rem; } /* Mover toggle arriba en movil */
}