/* ============================================================
    1. RESET Y BASE
    ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background: #0A0A0F;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    color: #fff;
    position: relative;
    padding-top: 76px;
    padding-bottom: 50px; /* espacio para el footer */
}

/* ============================================================
    2. FONDO DE PARTÍCULAS
    ============================================================ */
#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* ============================================================
    3. NAVBAR (con enlaces a Inicio y Proyectos)
    ============================================================ */
.navbar-custom {
    background-color: #0A0A0F;
    border-bottom: 1px solid #2A2A35;
    padding: 0.5rem 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
}
.navbar-logo {
    height: 40px;
    width: auto;
    border-radius: 4px;
    transition: opacity 0.2s;
}
.navbar-logo:hover {
    opacity: 0.8;
}
.navbar-custom .navbar-nav .nav-link {
    color: #A0A0A0;
    font-weight: 500;
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.5rem 0.75rem;
    transition: color 0.25s ease;
}
.navbar-custom .navbar-nav .nav-link:hover,
.navbar-custom .navbar-nav .nav-link.active {
    color: #FFFFFF;
}
.navbar-custom .navbar-toggler {
    border-color: #2A2A35;
    color: #A0A0A0;
}
.navbar-custom .navbar-toggler:focus {
    box-shadow: none;
}

/* ============================================================
    4. CONTENEDOR DEL GRAFO
    ============================================================ */
#graph-container {
    position: relative;
    z-index: 1;
    width: 100vw;
    height: calc(100vh - 76px - 50px); /* resto navbar y footer */
}
svg {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
}
svg:active {
    cursor: grabbing;
}

/* ============================================================
    5. NODOS Y ENLACES
    ============================================================ */
.node-group {
    cursor: pointer;
    transition: filter 0.2s;
}
.node-group:hover {
    filter: drop-shadow(0 0 12px rgba(160, 160, 160, 0.6));
}
.node-circle {
    fill: #1A1A24;
    stroke: #7A7A8A;
    stroke-width: 1.5;
    transition: stroke 0.3s, fill 0.3s;
}
.node-group:hover .node-circle {
    stroke: #ffffff;
    fill: #2A2A35;
}
.node-label {
    fill: #e0e0e0;
    font-size: 10px;
    font-weight: 500;
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
    user-select: none;
    letter-spacing: 0.02em;
    text-shadow: 0 0 8px rgba(0,0,0,0.9);
}
.link {
    stroke: #4A4A5A;
    stroke-width: 1.2;
    stroke-opacity: 0.25;
    transition: stroke-opacity 0.4s, stroke 0.4s;
}
.link.highlight {
    stroke-opacity: 0.9;
    stroke: #c0c0d0;
}
.link.dim {
    stroke-opacity: 0.08;
}

/* ============================================================
    6. TOOLTIP / CARD DE INFORMACIÓN
    ============================================================ */
.node-tooltip {
    position: absolute;
    background: rgba(16, 16, 24, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid #3A3A4A;
    border-radius: 12px;
    padding: 16px;
    color: #ddd;
    font-size: 13px;
    max-width: 280px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.25s ease, transform 0.2s ease;
    transform: scale(0.96);
    z-index: 20;
    box-shadow: 0 12px 40px rgba(0,0,0,0.7);
    line-height: 1.5;
}
.node-tooltip.visible {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}
.node-tooltip .tooltip-img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 10px;
    background: #1A1A24;
}
.node-tooltip .tooltip-img.error {
    display: none;
}
.node-tooltip .tooltip-title {
    font-weight: 700;
    font-size: 1rem;
    color: #fff;
    margin-bottom: 4px;
}
.node-tooltip .tooltip-desc {
    font-size: 0.85rem;
    color: #b0b0b0;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.node-tooltip .tooltip-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.node-tooltip .tooltip-buttons a {
    background: transparent;
    color: #7A7A8A;
    border: 1px solid #7A7A8A;
    font-weight: 500;
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.25rem 1rem;
    border-radius: 50px;
    transition: background 0.25s, color 0.25s, border-color 0.25s;
    text-decoration: none;
    display: inline-block;
    cursor: pointer;
}
.node-tooltip .tooltip-buttons a:hover {
    background: #7A7A8A;
    color: #0A0A0F;
    border-color: #7A7A8A;
}
.node-tooltip .tooltip-buttons a.disabled {
    opacity: 0.3;
    pointer-events: none;
}

/* ============================================================
    7. BOTÓN CENTRAR (flotante, destacado)
    ============================================================ */
.btn-center-container {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 15;
    text-align: center;
    pointer-events: none;
}
.btn-center {
    background: rgba(20, 20, 30, 0.8);
    backdrop-filter: blur(8px);
    border: 1px solid #7A7A8A;
    color: #e0e0e0;
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.6rem 1.8rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    cursor: pointer;
    pointer-events: auto;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.btn-center:hover {
    background: #7A7A8A;
    color: #0A0A0F;
    border-color: #7A7A8A;
    transform: scale(1.05);
    box-shadow: 0 8px 30px rgba(122, 122, 138, 0.3);
}
.btn-center:active {
    transform: scale(0.95);
}

/* ============================================================
    8. INSTRUCCIONES DE INTERACCIÓN (esquina inferior izquierda)
    ============================================================ */
.interaction-tips {
    position: fixed;
    bottom: 60px;
    left: 20px;
    z-index: 15;
    background: rgba(10, 10, 15, 0.75);
    backdrop-filter: blur(6px);
    border: 1px solid #2A2A35;
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 0.7rem;
    color: #aaa;
    line-height: 1.6;
    max-width: 180px;
    pointer-events: none;
    user-select: none;
    letter-spacing: 0.02em;
}
.interaction-tips strong {
    color: #ddd;
    display: block;
    margin-bottom: 4px;
    font-size: 0.75rem;
}
.interaction-tips span {
    display: block;
}
.interaction-tips .key {
    display: inline-block;
    background: #1A1A24;
    border: 1px solid #3A3A4A;
    border-radius: 3px;
    padding: 0 6px;
    font-size: 0.65rem;
    color: #ccc;
    margin: 0 2px;
}

/* ============================================================
    9. FOOTER (fijo abajo)
    ============================================================ */
.footer-custom {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(6px);
    border-top: 1px solid #2A2A35;
    padding: 0.6rem 0;
    text-align: center;
    color: #6C6C7A;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
}
.footer-custom a {
    color: #7A7A8A;
    text-decoration: none;
    transition: color 0.2s;
}
.footer-custom a:hover {
    color: #ffffff;
}

/* ============================================================
    10. RESPONSIVE: ajustes para tablets y móviles
    ============================================================ */

/* Tablets y pantallas medianas */
@media (max-width: 992px) {
    .navbar-custom .navbar-nav .nav-link {
        font-size: 0.7rem;
        padding: 0.4rem 0.5rem;
    }
    .btn-center {
        font-size: 0.75rem;
        padding: 0.5rem 1.4rem;
    }
    .interaction-tips {
        font-size: 0.65rem;
        padding: 8px 12px;
        max-width: 150px;
    }
    .interaction-tips strong {
        font-size: 0.7rem;
    }
    .node-label {
        font-size: 9px;
    }
    .node-tooltip {
        max-width: 240px;
        padding: 14px;
        font-size: 12px;
    }
    .node-tooltip .tooltip-img {
        height: 100px;
    }
    .node-tooltip .tooltip-title {
        font-size: 0.95rem;
    }
    .node-tooltip .tooltip-desc {
        font-size: 0.8rem;
        -webkit-line-clamp: 3;
    }
}

/* Móviles grandes y pequeños */
@media (max-width: 600px) {
    body {
        padding-top: 64px; /* navbar más compacto */
        padding-bottom: 40px;
    }
    .navbar-custom {
        padding: 0.3rem 0;
    }
    .navbar-logo {
        height: 32px;
    }
    .navbar-custom .navbar-nav .nav-link {
        font-size: 0.65rem;
        padding: 0.3rem 0.5rem;
    }
    #graph-container {
        height: calc(100vh - 64px - 40px);
    }
    .node-circle {
        r: 16px; /* reducimos tamaño de nodos */
    }
    .node-label {
        font-size: 7px;
        dy: 24px;
    }
    .link {
        stroke-width: 1;
    }
    .node-tooltip {
        max-width: 200px;
        padding: 10px;
        font-size: 11px;
        border-radius: 8px;
    }
    .node-tooltip .tooltip-img {
        height: 70px;
    }
    .node-tooltip .tooltip-title {
        font-size: 0.85rem;
    }
    .node-tooltip .tooltip-desc {
        font-size: 0.75rem;
        -webkit-line-clamp: 3;
    }
    .node-tooltip .tooltip-buttons a {
        font-size: 0.55rem;
        padding: 0.2rem 0.7rem;
    }
    .btn-center-container {
        bottom: 60px;
    }
    .btn-center {
        font-size: 0.65rem;
        padding: 0.4rem 1rem;
    }
    .interaction-tips {
        display: none; /* ocultamos en móviles para no saturar */
    }
    .footer-custom {
        font-size: 0.6rem;
        padding: 0.4rem 0;
    }
}

/* Móviles muy pequeños (menos de 400px) */
@media (max-width: 400px) {
    .node-circle {
        r: 12px;
    }
    .node-label {
        font-size: 6px;
        dy: 18px;
    }
    .node-tooltip {
        max-width: 160px;
        padding: 8px;
        font-size: 10px;
    }
    .node-tooltip .tooltip-img {
        height: 50px;
    }
    .node-tooltip .tooltip-title {
        font-size: 0.75rem;
    }
    .node-tooltip .tooltip-desc {
        font-size: 0.65rem;
        -webkit-line-clamp: 2;
    }
    .node-tooltip .tooltip-buttons a {
        font-size: 0.5rem;
        padding: 0.15rem 0.5rem;
    }
    .btn-center {
        font-size: 0.6rem;
        padding: 0.3rem 0.8rem;
    }
}

/* Ajuste para pantallas táctiles (mayor área de clic) */
@media (hover: none) and (pointer: coarse) {
    .node-circle {
        r: 26px; /* más grande para dedos */
    }
    .node-label {
        font-size: 10px;
        dy: 36px;
    }
    .node-tooltip {
        pointer-events: none; /* en táctil no se puede hacer hover, pero el tooltip se muestra al tocar? Mejor dejamos solo clic */
    }
}

/* ============================================================
    11. MEJORA DE ACCESIBILIDAD EN TÁCTIL
    ============================================================ */
@media (hover: none) {
    .node-group {
        cursor: default;
    }
    .node-tooltip.visible {
        pointer-events: none; /* evitamos que interfiera con clics */
    }
}