/* Variables de Color (Paleta Tecnológica Oscura y Elegante) */
:root {
    --bg-main: #0f172a;       /* Slate 900 */
    --bg-card: #1e293b;       /* Slate 800 */
    --bg-header: #111827;     /* Gray 900 */
    --accent: #38bdf8;        /* Sky 400 */
    --accent-hover: #0ea5e9;  /* Sky 500 */
    --text-main: #f8fafc;     /* Slate 50 */
    --text-muted: #94a3b8;    /* Slate 400 */
    --border-color: #334155;  /* Slate 700 */
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    padding-bottom: 40px;
}

/* Cabecera / Tarjeta de Presentación Principal */
header.profile-card {
    background-color: var(--bg-header);
    text-align: center;
    padding: 50px 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.avatar-container {
    margin-bottom: 16px;
}

.avatar-placeholder {
    width: 90px;
    height: 90px;
    background: linear-gradient(135deg, var(--accent), #2563eb);
    color: white;
    font-size: 32px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin: 0 auto;
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.3);
}

header h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.025em;
}

header .subtitle {
    color: var(--accent);
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

header .specialty {
    color: var(--text-muted);
    font-size: 14px;
}

/* Etiquetas de Habilidades */
.tags {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    border: 1px solid rgba(56, 189, 248, 0.2);
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
}

/* Contenedor Principal */
.container {
    max-width: 900px;
    margin: 40px auto 0 auto;
    padding: 0 20px;
}

h2 {
    font-size: 20px;
    color: white;
    margin-bottom: 12px;
    font-weight: 600;
}

.section-desc {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

/* Cuadrícula de Tarjetas de Enlaces */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

@media (max-width: 480px) {
    .links-grid {
        grid-template-columns: 1fr;
    }
}

.software-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    gap: 16px;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.software-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

.card-icon {
    font-size: 32px;
    display: flex;
    align-items: flex-start;
    padding-top: 4px;
}

.card-info h3 {
    font-size: 16px;
    color: white;
    margin-bottom: 6px;
    font-weight: 600;
}

.card-info p {
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 12px;
}

.link-label {
    display: inline-block;
    font-size: 12px;
    color: var(--accent);
    font-weight: 500;
}

/* Sección de Contacto */
.contact-section {
    background-color: var(--bg-header);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
}

.contact-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.contact-btn {
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    transition: background-color 0.2s ease;
}

.email-btn {
    background-color: var(--accent);
    color: #0f172a;
}

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

.github-btn {
    background-color: #334155;
    color: white;
    border: 1px solid var(--border-color);
}

.github-btn:hover {
    background-color: #475569;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-muted);
}