:root {
  /* Nueva paleta oscura más sobria y accesible */
  --bg: #121820;            /* Fondo principal (mejor contraste que #0f1115) */
  --panel: #1d2732;         /* Panel base */
  --panel-alt: #25313d;     /* Panel alterno para secciones plegables */
  --border: #2e3c48;        /* Borde neutro consistente */
  --accent: #6366f1;        /* Indigo accesible */
  --accent-alt: #8b5cf6;    /* Variante para gradiente */
  --accent-grad: linear-gradient(135deg, var(--accent), var(--accent-alt) 55%, #3b82f6);
  --radius: 14px;
  --text: #e5e9ef;          /* Texto principal */
  --muted: #93a5b5;         /* Texto secundario ligeramente más legible */
  --danger: #ef4663;        /* Ajuste leve de rojo */
  --warn: #f9ae39;          /* Amarillo más suave */
  --ok: #10b981;            /* Verde accesible */
  --focus: #94a3ff;         /* Anillo de foco */
  --shadow-sm: 0 4px 18px -6px rgba(0,0,0,.55);
  --shadow-lg: 0 10px 32px -10px rgba(0,0,0,.6);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
body { margin:0; background: var(--bg); color: var(--text); -webkit-font-smoothing: antialiased; }

.site-header { padding: 2.5rem 1.2rem 1rem; text-align:center; background: linear-gradient(180deg, #f8f9fb 0%, #e8ecf1 100%); }
.site-logo { max-width: 180px; height: auto; margin: 0 auto 1.2rem; display: block; }
.site-header h1 { margin:0 0 .4rem; font-size: clamp(1.9rem,4.5vw,3rem); color: #023FA7; }
.subtitle { margin:0; color: #545659; font-weight:500; }

.grid { width: min(1400px,94%); margin: 0 auto; display: grid; gap: 1.6rem; padding: 1.5rem 0 3rem; grid-template-columns: repeat(auto-fill,minmax(330px,1fr)); }

.poc-card { background: var(--panel); border:1px solid var(--border); border-radius: var(--radius); display:flex; flex-direction:column; position:relative; overflow:hidden; box-shadow: var(--shadow-sm); transition:.35s ease box-shadow, .35s ease transform, .35s ease border-color; }
.poc-card:hover { transform:translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--accent); }
.poc-card__header { padding:1.1rem 1.1rem .4rem; }
.poc-title { margin:0 0 .15rem; font-size:1.15rem; letter-spacing:.5px; }
.badge { display:inline-block; background: var(--accent-grad); color:#fff; padding:.4rem .75rem; border-radius:40px; font-size:.62rem; text-transform:uppercase; letter-spacing:.85px; font-weight:600; box-shadow:0 0 0 1px rgba(255,255,255,.08) inset, 0 3px 10px -3px rgba(0,0,0,.5); }
.badge:hover { filter:brightness(1.08); }
.badge:active { transform:scale(.96); }
.poc-link { display:inline-block; margin-left:.6rem; font-size:.65rem; font-weight:600; padding:.42rem .8rem; border-radius:40px; background:#237FCF; color:#ffffff; text-decoration:none; letter-spacing:.8px; border:1px solid #237FCF; transition:.25s ease background,.25s ease border-color; box-shadow:0 2px 8px -2px rgba(35,127,207,.3); }
.poc-link:hover { background:#023FA7; border-color:#023FA7; color:#ffffff; }
.poc-link:active { transform:translateY(1px); }
.poc-link:focus-visible { outline:2px solid var(--focus); outline-offset:2px; }
.poc-inline-meta { display:flex; flex-wrap:wrap; gap:.4rem .6rem; padding:0 1.1rem .6rem; align-items:center; }
.poc-status-pill { font-size:.55rem; font-weight:600; letter-spacing:1px; text-transform:uppercase; padding:.35rem .7rem; border-radius:40px; border:1px solid var(--border); background:#2e3c48; color:#fff; }
.poc-status-pill.status-completado { background:var(--ok); color:#072f22; border-color:var(--ok); }
.poc-status-pill.status-en-progreso { background:#f59e0b; color:#412b00; border-color:#f59e0b; }
.poc-status-pill.status-planificado { background:#64748b; color:#10171f; border-color:#64748b; }
.poc-tags { display:flex; flex-wrap:wrap; gap:.35rem; }
.poc-tags .tag-chip { font-size:.55rem; font-weight:600; letter-spacing:.5px; padding:.32rem .6rem; background:#8DAA40; border:1px solid #8DAA40; color:#ffffff; border-radius:30px; }
.poc-tags .tag-chip:hover { background:#B2CA70; color:#ffffff; border-color:#B2CA70; }

/* Lightbox */
.lightbox { position:fixed; inset:0; display:flex; align-items:center; justify-content:center; background:rgba(17,24,31,.78); backdrop-filter:blur(6px); z-index:999; padding:2rem 1.2rem; }
.lightbox[hidden] { display:none; }
.lightbox-content { position:relative; max-width:95vw; max-height:90vh; display:flex; flex-direction:column; align-items:center; gap:.9rem; }
.lightbox-figure { margin:0; display:flex; flex-direction:column; align-items:center; gap:.6rem; }
#lightbox-img { max-width:92vw; max-height:75vh; object-fit:contain; transition:transform .25s ease; cursor:grab; border-radius:10px; box-shadow:0 8px 40px -10px rgba(0,0,0,.7),0 0 0 1px rgba(255,255,255,.06) inset; }
.lightbox-close { position:absolute; top:-12px; right:-12px; background:#2e3c48; color:#fff; border:1px solid var(--border); font-size:1.1rem; width:38px; height:38px; border-radius:50%; cursor:pointer; box-shadow:0 4px 14px -4px rgba(0,0,0,.5); }
.lightbox-close:hover { background:var(--accent); border-color:var(--accent); }
.lightbox-tools { display:flex; gap:.5rem; }
.lightbox-tools button { background:#2a3640; color:#fff; border:1px solid var(--border); padding:.5rem .8rem; font-size:.65rem; font-weight:600; letter-spacing:.8px; border-radius:8px; cursor:pointer; }
.lightbox-tools button:hover { background:var(--accent); border-color:var(--accent); }
.lightbox-tools button:active { transform:translateY(1px); }
.lightbox-tools button:focus-visible { outline:2px solid var(--focus); outline-offset:2px; }
@media (prefers-color-scheme: light) {
  .lightbox { background:rgba(240,245,250,.82); }
  .lightbox-close { background:#fff; color:#1e2430; }
  .lightbox-close:hover { background:var(--accent); color:#fff; }
  .lightbox-tools button { background:#e9eef5; color:#1e2430; }
  .lightbox-tools button:hover { color:#fff; }
}

.poc-description { padding:0 1.1rem .9rem; margin:0; color: var(--muted); font-size:.9rem; line-height:1.35rem; }

.poc-details { background: var(--panel-alt); margin:0; border-top:1px solid var(--border); padding:.5rem 1.1rem 1.1rem; }
.poc-details summary { cursor:pointer; font-weight:600; color: var(--accent); }
.poc-details[open] summary { margin-bottom:.6rem; }
.poc-details summary:focus-visible { outline:2px solid var(--focus); outline-offset:3px; border-radius:6px; }

.meta { margin:0; display:grid; gap:.75rem; font-size:.75rem; }
.meta dt { font-weight:600; color: var(--text); }
.meta dd { margin:0; color: var(--muted); line-height:1.1rem; }
.meta div { background:#1f252c; padding:.6rem .7rem .55rem; border-radius:10px; border:1px solid var(--border); }

.diagram-wrap { margin:.9rem 0 0; display:flex; flex-direction:column; gap:.5rem; align-items:center; }
.diagram-wrap img { width:100%; max-height:220px; object-fit:contain; filter: drop-shadow(0 4px 12px rgba(0,0,0,.5)); }
.diagram-caption { font-size:.6rem; text-transform:uppercase; letter-spacing:1.3px; color: var(--muted); }

.site-footer { text-align:center; padding:2rem 0 3rem; font-size:.7rem; color: var(--muted); }

@media (prefers-color-scheme: light) {
  :root {
    --bg:#f5f7fa;
    --panel:#ffffff;
    --panel-alt:#f2f6fa;
    --border:#d9e2ea;
    --text:#1e2430;
    --muted:#5d6b78;
    --accent:#4f46e5;
    --accent-alt:#7c3aed;
    --accent-grad:linear-gradient(135deg,#4f46e5,#7c3aed 55%, #2563eb);
    --focus:#7d86ff;
    --shadow-sm:0 4px 16px -6px rgba(0,0,0,.12);
    --shadow-lg:0 10px 28px -10px rgba(0,0,0,.18);
  }
  body { color: var(--text); }
  .poc-card { box-shadow: var(--shadow-sm); }
  .poc-card:hover { box-shadow: var(--shadow-lg); }
  .meta div { background:#fff; }
  .diagram-caption { color:#6b7785; }
}