:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --tag-bg: #334155;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', sans-serif; scroll-behavior: smooth; }
body { background-color: var(--bg-color); color: var(--text-primary); line-height: 1.6; }

/* Container base */
.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: inherit; transition: 0.3s; }

/* Navegación */
nav { 
    padding: 10px 0; 
    position: sticky; 
    top: 0; 
    background: rgba(15, 23, 42, 0.95); 
    z-index: 100; 
    border-bottom: 1px solid #334155;
    transition: transform 0.3s ease-in-out;
}

.nav-hidden {
    transform: translateY(-100%);
}

.nav-content { display: flex; justify-content: space-between; align-items: center; }
.logo { color: var(--accent); font-weight: 700; font-size: 1.5rem; }
.nav-links { list-style: none; display: flex; gap: 20px; align-items: center; }
.nav-links a:hover {
    color: var(--accent);
}
.btn-contact {
    border: 1px solid var(--accent);
    padding: 5px 15px;
    border-radius: 5px;
    color: var(--accent);
    transition: 0.3s;
}
.nav-links .btn-contact:hover {
    background-color: var(--accent) !important; /* Fuerza el fondo celeste */
    color: var(--bg-color) !important;          /* Fuerza el texto oscuro */
    font-weight: 600;
}

/* Hero */
.hero { padding: 80px 0; text-align: center; }
.badge { background: rgba(56, 189, 248, 0.1); color: var(--accent); padding: 5px 12px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; text-transform: uppercase; }

/* El título principal se ajusta dinámicamente */
.hero h2 { 
    font-size: 3rem; 
    margin: 20px 0; 
    line-height: 1.2;
}

/* Efectos visuales */
.gradient-text {
    background: linear-gradient(45deg, #38bdf8, #818cf8, #38bdf8);
    background-size: 200% auto;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: shine 3s linear infinite;
}

@keyframes shine {
    to { background-position: 200% center; }
}

.typewriter-container {
    font-size: 1.5rem;
    min-height: 1.6em;
    color: var(--text-secondary);
}

#typewriter {
    font-weight: bold;
    color: var(--accent);
}

.cursor {
    display: inline-block;
    width: 3px;
    background-color: var(--text-primary);
    animation: blink 1s infinite;
    margin-left: 2px;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.accent { color: var(--accent); }
.hero p { color: var(--text-secondary); max-width: 600px; margin: 0 auto 30px; font-size: 1.1rem; }
.hero-btns { display: flex; gap: 15px; justify-content: center; }
.btn { padding: 10px 24px; border-radius: 6px; font-weight: 600; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; justify-content: center; }
.primary { background: var(--accent); color: var(--bg-color); }
.primary:hover { opacity: 0.9; }
.secondary { background: var(--tag-bg); }
.secondary:hover { background: #475569; }

/* Sobre Mi */
.about-section { padding: 60px 0; background: #162032; text-align: center; }
.about-content h3 { font-size: 2rem; margin-bottom: 20px; }
.tech-stack { margin-top: 20px; display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }
.tech-stack span { background: var(--tag-bg); padding: 5px 12px; border-radius: 4px; font-size: 0.9rem; border: 1px solid #475569; }

/* Proyectos */
.projects-section { padding: 60px 0; }
.section-title { font-size: 2rem; margin-bottom: 30px; text-align: center; }

/* Buscador y Filtros */
.filter-container { margin-bottom: 40px; text-align: center; }
.search-bar { width: 100%; max-width: 400px; padding: 12px; border-radius: 8px; border: 1px solid #334155; background: var(--card-bg); color: white; margin-bottom: 20px; font-size: 1rem; }
.tags-filter { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.filter-tag { background: transparent; border: 1px solid #334155; color: var(--text-secondary); padding: 8px 16px; border-radius: 20px; cursor: pointer; transition: 0.3s; }
.filter-tag:hover, .filter-tag.active { background: var(--accent); color: var(--bg-color); border-color: var(--accent); font-weight: 600; }

/* Cards */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; }
.project-card { background: var(--card-bg); border-radius: 12px; padding: 25px; border: 1px solid #334155; transition: transform 0.3s; display: flex; flex-direction: column; }
.project-card:hover { transform: translateY(-5px); border-color: var(--accent); }
.card-header { display: flex; justify-content: space-between; margin-bottom: 15px; font-size: 1.5rem; color: var(--accent); }
.project-title { font-size: 1.25rem; margin-bottom: 10px; }
.project-desc { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 20px; flex-grow: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.links a { color: var(--text-secondary); margin-left: 10px; font-size: 1.2rem; }
.links a:hover { color: white; }

/* Estilo para los Tags */
.tech-tag {
    font-size: 0.75rem;
    color: var(--accent);
    font-family: 'Inter', sans-serif;
    border: 1px solid var(--accent);
    padding: 3px 10px;
    border-radius: 15px;
    background-color: rgba(56, 189, 248, 0.1);
    display: inline-block;
    cursor: default;
}

/* Footer */
footer { padding: 50px 0; text-align: center; border-top: 1px solid #334155; }
.email-link { font-size: 1.2rem; color: var(--accent); font-weight: bold; }

#sobre-mi, #proyectos, #contacto {
    scroll-margin-top: 80px; /* Aumentado para compensar el header */
}

/* =========================================
   ESTILOS DEL MODAL (POPUP)
   ========================================= */
.modal {
    display: none;
    position: fixed; 
    z-index: 1000; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto;
    background-color: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto;
    padding: 30px;
    border: 1px solid var(--accent);
    border-radius: 12px;
    width: 90%; 
    max-width: 800px;
    position: relative;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    animation: fadeIn 0.3s;
}

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

.close-btn {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.close-btn:hover { color: var(--accent); }

.modal-header h2 { color: var(--accent); margin-bottom: 10px; }
.modal-body h3 { color: var(--text-primary); margin-top: 20px; margin-bottom: 10px; border-bottom: 1px solid #334155; padding-bottom: 5px; }
.modal-body p { margin-bottom: 10px; color: var(--text-secondary); }
.modal-body ul { margin-left: 20px; margin-bottom: 15px; color: var(--text-secondary); }
.modal-body li { margin-bottom: 5px; }
.modal-body img { width: 100%; border-radius: 8px; margin-top: 10px; border: 1px solid #334155; }
.modal-table { width: 100%; border-collapse: collapse; margin: 15px 0; font-size: 0.9rem; }
.modal-table th, .modal-table td { border: 1px solid #334155; padding: 8px; text-align: left; }
.modal-table th { background-color: var(--tag-bg); color: var(--accent); }
.modal-table td { color: var(--text-secondary); }

/* =========================================
   RESPONSIVE DESIGN (CELULARES)
   ========================================= */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .nav-content {
        flex-direction: row; /* Forzamos la fila */
        justify-content: space-between;
        align-items: center;
    }
    
    .nav-links {
        font-size: 0.85rem;
        gap: 10px; 
    }

    .typewriter-container {
        font-size: 1.2rem;
    }

    .hero h2 {
        font-size: clamp(2rem, 9vw, 2.5rem);
    }
    
    .hero p {
        font-size: 1rem;
        padding: 0;
    }

    .hero-btns {
        flex-direction: column;
        gap: 12px;
        width: 100%;
        max-width: 100%;
    }

    .btn { width: 100%; }

    /* Ajuste de modal para móvil */
    .modal-content {
        margin: 10% auto;
        width: 95%;
        padding: 20px;
    }
    .modal-table { display: block; overflow-x: auto; }
}