/* Variables de Diseño (Light / Dark Mode) */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a1d20;
    --text-secondary: #4a5568;
    --accent: #2563eb; /* Azul corporativo moderno */
    --accent-gradient: linear-gradient(135deg, #2563eb, #3b82f6);
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --border-color: #334155;
    --card-bg: #1e293b;
}

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

html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

/* Contenedores */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
.max-width-md {
    max-width: 650px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
}
.logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-primary);
}
.logo span { color: var(--accent); }
.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.nav-menu a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}
.nav-menu a:hover { color: var(--accent); }

/* Botones */
.btn-primary, .btn-secondary {
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}
.btn-primary {
    background-color: var(--accent);
    color: #ffffff !important;
}
.btn-primary:hover { opacity: 0.9; }
.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover { background-color: var(--bg-secondary); }
.btn-block { width: 100%; display: flex; justify-content: center; align-items: center; gap: 0.5rem; }

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.2rem;
}

/* Hero Section */
.hero {
    padding: 8rem 0 5rem 0;
    text-align: center;
    background-color: var(--bg-secondary);
}
.hero h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}
.text-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-subtitle {
    max-width: 600px;
    margin: 0 auto 2rem auto;
    font-size: 1.2rem;
    color: var(--text-secondary);
}
.hero-cta { display: flex; justify-content: center; gap: 1rem; }

/* Secciones */
.section { padding: 5rem 0; }
.bg-light { background-color: var(--bg-secondary); }
.section-title { text-align: center; font-size: 2rem; margin-bottom: 3rem; }

/* Sobre Mí */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; }
.about-stats { display: flex; gap: 1rem; }
.stat-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
    flex: 1;
}
.stat-card h3 { font-size: 2.5rem; color: var(--accent); }

/* Timeline Experiencia */
.timeline { position: relative; border-left: 2px solid var(--border-color); margin-left: 1rem; }
.timeline-item { position: relative; padding-left: 2rem; margin-bottom: 2.5rem; }
.timeline-dot { position: absolute; left: -6px; top: 5px; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); }
.timeline-date { font-weight: bold; color: var(--accent); }
.timeline-content h3 { font-size: 1.3rem; margin-top: 0.25rem; }
.timeline-content h4 { color: var(--text-secondary); font-weight: 500; margin-bottom: 0.5rem; }

/* Habilidades */
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.skills-category { background: var(--card-bg); padding: 2rem; border-radius: 8px; border: 1px solid var(--border-color); }
.skills-category h3 { margin-bottom: 1rem; color: var(--accent); }
.skills-category ul { list-style: none; }
.skills-category ul li { padding: 0.5rem 0; border-bottom: 1px solid var(--border-color); }
.skills-category ul li:last-child { border: none; }

/* Formulario Dinámico */
.dynamic-form { background: var(--card-bg); padding: 2.5rem; border-radius: 8px; border: 1px solid var(--border-color); }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; }
.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 6px;
    outline: none;
    transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-message { margin-top: 1rem; text-align: center; font-weight: 500; display: none; }
.form-message.success { color: #10b981; display: block; }
.form-message.error { color: #ef4444; display: block; }

/* Footer */
.footer { text-align: center; padding: 2rem; border-top: 1px solid var(--border-color); background: var(--bg-primary); }

/* Responsivo */
@media (max-width: 768px) {
    .nav-menu { display: none; } /* En producción agregarías un menú hamburguesa */
    .about-grid, .skills-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.2rem; }
}