/* ─── TOKENS ────────────────────────────────────────────── */
    :root {
      --bg:        #F5F2EC;
      --surface:   #EDEAE2;
      --border:    #D8D3C8;
      --ink:       #1A1814;
      --ink-soft:  #5C584F;
      --accent:    #2E6BE6;   /* azul profesional */
      --warm:      #E07B39;   /* naranja cálido    */
      --warm-lt:   #FBF0E6;
      --accent-lt: #E8EFFC;
      --node-size: 2.2rem;
      --path-color:#2E6BE6;
      --radius:    1rem;
      --font-disp: 'Playfair Display', serif;
      --font-body: 'DM Sans', sans-serif;
      --font-mono: 'DM Mono', monospace;
    }

    /* ─── RESET ─────────────────────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      background: var(--bg);
      color: var(--ink);
      font-family: var(--font-body);
      font-size: 1rem;
      line-height: 1.65;
      overflow-x: hidden;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }

    /* ─── NAV ───────────────────────────────────────────────── */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      background: rgba(245,242,236,0.88);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
      display: flex; align-items: center; justify-content: space-between;
      padding: 0.75rem 1.25rem;
    }
    .nav-logo {
      font-family: var(--font-disp);
      font-size: 1.1rem;
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    .nav-logo img {
      width: 34px; height: 34px;
      border-radius: 50%;
      object-fit: cover;
      border: 2px solid var(--accent);
      vertical-align: middle;
      margin-right: 0.5rem;
    }
    .nav-logo span { color: var(--accent); }
    .nav-links {
      display: flex; gap: 1.5rem; list-style: none;
    }
    .nav-links a {
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--ink-soft);
      transition: color .2s;
    }
    .nav-links a:hover { color: var(--accent); }
    .nav-toggle {
      display: none;
      background: none; border: none; cursor: pointer;
      flex-direction: column; gap: 5px; padding: 4px;
    }
    .nav-toggle span {
      display: block; width: 22px; height: 2px;
      background: var(--ink); border-radius: 2px;
      transition: all .3s;
    }

    /* ─── HERO ──────────────────────────────────────────────── */
    .hero {
      min-height: 100svh;
      display: grid;
      grid-template-columns: 1fr;
      align-items: center;
      padding: 7rem 1.25rem 3rem;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-circle {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.25;
      pointer-events: none;
    }
    .hero-bg-circle.c1 {
      width: 500px; height: 500px;
      background: var(--accent);
      top: -150px; right: -100px;
    }
    .hero-bg-circle.c2 {
      width: 350px; height: 350px;
      background: var(--warm);
      bottom: -80px; left: -80px;
    }
    .hero-content { position: relative; max-width: 700px; }
    .hero-tag {
      display: inline-block;
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--accent);
      background: var(--accent-lt);
      border: 1px solid var(--accent);
      border-radius: 2rem;
      padding: 0.25rem 0.75rem;
      margin-bottom: 1.25rem;
      letter-spacing: 0.05em;
    }
    .hero-content img {
      width: 90px; height: 90px; border-radius: 50%; object-fit: cover;
      border: 3px solid var(--accent);
      box-shadow: 0 4px 20px rgba(46,107,230,0.18);
      margin-bottom: 1.25rem;
    }
    .hero h1 {
      font-family: var(--font-disp);
      font-size: clamp(2.4rem, 8vw, 5rem);
      font-weight: 900;
      line-height: 1.05;
      letter-spacing: -0.03em;
      margin-bottom: 0.5rem;
    }
    .hero h1 .name-accent { color: var(--accent); }
    .hero h1 .name-warm  { color: var(--warm); }
    .hero-sub {
      font-size: clamp(1rem, 3vw, 1.2rem);
      color: var(--ink-soft);
      margin-bottom: 2rem;
      font-weight: 300;
      max-width: 520px;
    }
    .hero-sub strong { color: var(--ink); font-weight: 500; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
    .btn {
      display: inline-flex; align-items: center; gap: 0.4rem;
      padding: 0.7rem 1.4rem;
      border-radius: 0.5rem;
      font-weight: 500; font-size: 0.9rem;
      transition: all .2s;
      cursor: pointer; border: none;
    }
    .btn-primary {
      background: var(--accent); color: #fff;
    }
    .btn-primary:hover { background: #1a55cc; transform: translateY(-1px); }
    .btn-ghost {
      background: transparent; color: var(--ink);
      border: 1.5px solid var(--border);
    }
    .btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

    .hero-meta {
      margin-top: 2.5rem;
      display: flex; flex-wrap: wrap; gap: 1rem;
    }
    .hero-chip {
      display: flex; align-items: center; gap: 0.4rem;
      font-size: 0.8rem; color: var(--ink-soft);
    }
    .hero-chip .dot {
      width: 6px; height: 6px; border-radius: 50%;
      background: var(--warm); flex-shrink: 0;
    }

    /* ─── SECTIONS COMMON ───────────────────────────────────── */
    section { padding: 4.5rem 1.25rem; }
    .section-label {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--warm);
      letter-spacing: 0.12em;
      text-transform: uppercase;
      margin-bottom: 0.5rem;
    }
    .section-title {
      font-family: var(--font-disp);
      font-size: clamp(1.8rem, 5vw, 2.8rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.1;
      margin-bottom: 2.5rem;
    }
    .max-w { max-width: 760px; margin-left: auto; margin-right: auto; }

    /* ─── SOBRE MÍ ──────────────────────────────────────────── */
    #sobre-mi { background: var(--surface); }
    .about-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 2rem;
    }
    .about-text p {
      color: var(--ink-soft);
      margin-bottom: 1rem;
    }
    .about-text p:last-child { margin-bottom: 0; }
    .about-cards {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.75rem;
    }
    .about-card {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1rem;
    }
    .about-card .icon { font-size: 1.4rem; margin-bottom: 0.4rem; }
    .about-card strong { display: block; font-size: 0.85rem; margin-bottom: 0.2rem; }
    .about-card span { font-size: 0.78rem; color: var(--ink-soft); }

    /* ─── EDUCACIÓN (SERPENTEO) ─────────────────────────────── */
    #educacion { background: var(--bg); }
    .edu-path {
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 0;
      padding-bottom: 2rem;
    }
    .edu-item {
      display: flex;
      align-items: flex-start;
      gap: 1.25rem;
      position: relative;
      padding-bottom: 2.5rem;
    }
    /* Alterna dirección en desktop */
    .edu-item:nth-child(even) { flex-direction: row-reverse; text-align: right; }
    .edu-node-wrap {
      display: flex;
      flex-direction: column;
      align-items: center;
      flex-shrink: 0;
      position: relative;
    }
    .edu-node {
      width: var(--node-size);
      height: var(--node-size);
      border-radius: 50%;
      background: var(--accent-lt);
      border: 3px solid var(--accent);
      display: flex; align-items: center; justify-content: center;
      font-size: 1rem;
      position: relative;
      z-index: 1;
      flex-shrink: 0;
      transition: transform .2s, background .2s;
    }
    .edu-item:hover .edu-node {
      background: var(--accent);
      transform: scale(1.15);
    }
    /* Línea conectora zigzag via SVG in JS, aquí usamos pseudo + path divs */
    .edu-connector {
      width: 3px;
      flex: 1;
      min-height: 60px;
      background: linear-gradient(to bottom, var(--accent) 0%, var(--warm) 100%);
      border-radius: 3px;
      opacity: 0.35;
      margin-top: 0;
    }
    .edu-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1.1rem 1.25rem;
      flex: 1;
      transition: box-shadow .2s, border-color .2s;
    }
    .edu-item:hover .edu-card {
      border-color: var(--accent);
      box-shadow: 0 4px 20px rgba(46,107,230,0.1);
    }
    .edu-year {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--warm);
      letter-spacing: 0.08em;
      margin-bottom: 0.3rem;
    }
    .edu-title {
      font-weight: 500;
      font-size: 0.95rem;
      margin-bottom: 0.2rem;
    }
    .edu-inst {
      font-size: 0.8rem;
      color: var(--ink-soft);
    }
    /* Zigzag horizontal connector between alternating items */
    .edu-zigzag {
      display: none; /* shown in desktop via media query */
    }

    /* ─── HABILIDADES ───────────────────────────────────────── */
    #habilidades { background: var(--surface); }
    .skills-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1rem;
    }
    .skill-group {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1.25rem;
    }
    .skill-group h3 {
      font-size: 0.82rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--accent);
      margin-bottom: 0.85rem;
      display: flex; align-items: center; gap: 0.5rem;
    }
    .skill-group h3 span { font-size: 1rem; }
    .skill-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
    .skill-tag {
      font-size: 0.78rem;
      padding: 0.3rem 0.7rem;
      border-radius: 2rem;
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--ink-soft);
    }

    /* ─── EXPERIENCIA ───────────────────────────────────────── */
    #experiencia { background: var(--bg); }
    .exp-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-left: 4px solid var(--warm);
      border-radius: 0 var(--radius) var(--radius) 0;
      padding: 1.5rem;
      display: grid;
      gap: 0.5rem;
    }
    .exp-period {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--warm);
      letter-spacing: 0.08em;
    }
    .exp-role {
      font-family: var(--font-disp);
      font-size: 1.3rem;
      font-weight: 700;
    }
    .exp-org {
      font-size: 0.85rem;
      color: var(--ink-soft);
    }
    .exp-desc {
      font-size: 0.88rem;
      color: var(--ink-soft);
      margin-top: 0.25rem;
    }

    /* ─── PROYECTOS / BONUS TRACK ───────────────────────────── */
    #proyectos { background: var(--surface); }
    .projects-intro {
      font-size: 1rem;
      color: var(--ink-soft);
      margin-bottom: 2rem;
      font-style: italic;
    }
    .projects-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1rem;
    }
    .project-card {
      border: 1.5px solid var(--border);
      border-radius: var(--radius);
      padding: 1.4rem;
      display: flex; align-items: flex-start; gap: 1rem;
      transition: border-color .2s, box-shadow .2s;
      background: var(--bg);
      text-decoration: none;
    }
    .project-card:hover {
      border-color: var(--accent);
      box-shadow: 0 4px 20px rgba(46,107,230,0.1);
    }
    .project-icon {
      font-size: 2rem;
      flex-shrink: 0;
      width: 3rem; height: 3rem;
      display: flex; align-items: center; justify-content: center;
      background: var(--accent-lt);
      border-radius: 0.6rem;
    }
    .project-info h3 {
      font-weight: 600;
      font-size: 1rem;
      margin-bottom: 0.25rem;
    }
    .project-info p {
      font-size: 0.82rem;
      color: var(--ink-soft);
      margin-bottom: 0.5rem;
    }
    .project-link {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--accent);
      letter-spacing: 0.04em;
    }
    .project-card.warm .project-icon { background: var(--warm-lt); }
    .project-card.warm:hover { border-color: var(--warm); box-shadow: 0 4px 20px rgba(224,123,57,0.1); }
    .project-card.warm .project-link { color: var(--warm); }

    /* ─── CONTACTO ──────────────────────────────────────────── */
    #contacto {
      background: var(--ink);
      color: #fff;
    }
    #contacto .section-label { color: var(--warm); }
    #contacto .section-title { color: #fff; }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 0.75rem;
    }
    .contact-item {
      display: flex; align-items: center; gap: 1rem;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius);
      padding: 1rem 1.25rem;
      transition: background .2s, border-color .2s;
    }
    .contact-item:hover {
      background: rgba(255,255,255,0.09);
      border-color: rgba(255,255,255,0.2);
    }
    .contact-icon { font-size: 1.2rem; flex-shrink: 0; }
    .contact-label { font-size: 0.72rem; color: rgba(255,255,255,0.45); margin-bottom: 0.1rem; }
    .contact-value { font-size: 0.9rem; color: #fff; }
    .contact-note {
      margin-top: 1.5rem;
      font-size: 0.8rem;
      color: rgba(255,255,255,0.4);
    }

    /* ─── FOOTER ────────────────────────────────────────────── */
    footer {
      background: var(--ink);
      border-top: 1px solid rgba(255,255,255,0.08);
      text-align: center;
      padding: 1.5rem;
      font-size: 0.78rem;
      color: rgba(255,255,255,0.3);
    }
    footer a { color: rgba(255,255,255,0.5); }

    /* ─── ANIMATIONS ────────────────────────────────────────── */
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity .6s ease, transform .6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* ─── DESKTOP ───────────────────────────────────────────── */
    @media (min-width: 640px) {
      section { padding: 5.5rem 2rem; }
      nav { padding: 0.85rem 2rem; }
      .about-grid { grid-template-columns: 1fr 1fr; }
      .skills-grid { grid-template-columns: 1fr 1fr; }
      .projects-grid { grid-template-columns: 1fr 1fr; }
      .contact-grid { grid-template-columns: 1fr 1fr; }

      /* Zigzag educación en desktop */
      .edu-path {
        padding-left: 0; padding-right: 0;
      }
      .edu-item { gap: 2rem; }
      .edu-node-wrap { position: absolute; left: 50%; transform: translateX(-50%); }
      .edu-item { position: relative; padding-left: calc(50% + 2.5rem); padding-bottom: 3.5rem; }
      .edu-item:nth-child(even) {
        padding-left: 0;
        padding-right: calc(50% + 2.5rem);
        flex-direction: row;
        text-align: left;
      }
      .edu-item:nth-child(even) .edu-node-wrap {
        left: 50%; transform: translateX(-50%);
      }
      .edu-connector { display: none; }

      /* Vertical center line */
      .edu-path::before {
        content: '';
        position: absolute;
        left: 50%;
        top: 0; bottom: 0;
        width: 3px;
        background: linear-gradient(to bottom, var(--accent), var(--warm));
        opacity: 0.25;
        transform: translateX(-50%);
      }
    }

    @media (min-width: 900px) {
      .skills-grid { grid-template-columns: repeat(3, 1fr); }
    }

    /* ─── MOBILE NAV OPEN ───────────────────────────────────── */
    @media (max-width: 639px) {
      .nav-toggle { display: flex; }
      .nav-links {
        position: fixed; top: 52px; left: 0; right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height .3s ease;
      }
      .nav-links.open { max-height: 400px; }
      .nav-links li { border-bottom: 1px solid var(--border); }
      .nav-links a {
        display: block;
        padding: 0.85rem 1.25rem;
        font-size: 1rem;
        color: var(--ink);
      }
    }