/* Variables de diseño */
:root {
    --bg: #f9f9f9;
    --text: #222;
    --white: #ffffff;
}

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

body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    scroll-behavior: smooth;
}

/* Navegación Estándar */
header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 40px;
    background: rgba(255, 255, 255, 0.9);
    z-index: 1000;
    border-bottom: 1px solid #eee;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    text-transform: uppercase;
}

/* Contenedores y Tarjetas (Index) */
.container {
    padding: 120px 20px 60px;
    max-width: 800px;
    margin: 0 auto;
}

.card {
    background: var(--white);
    padding: 40px;
    margin-bottom: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* Galería (Travaux) */
.fullscreen img {
    width: 100%;
    height: 100vh;
    object-fit: cover;
    display: block;
}

.two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
}

.two-columns img {
    width: 100%;
    height: 100vh;
    object-fit: cover;
}

/* Botón Ascensor */
#elevator {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    background: #000;
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    justify-content: center;
    align-items: center;
}

/* Animaciones */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: 1s all ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}