:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --success-dark: #15803d;
  --border: #e5e7eb;
  --shadow: 0 16px 35px rgba(17, 24, 39, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.hero {
  padding: 38px 20px;
  background: linear-gradient(135deg, #1cabe2, #1e3a8a);
  color: white;
  text-align: center;
}

.hero h1 {
  margin: 6px 0 8px;
  font-size: clamp(2rem, 5vw, 3.4rem);
}

.hero p { margin: 0; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  opacity: 0.85;
}

.layout {
  width: min(1180px, calc(100% - 28px));
  margin: 26px auto;
  display: grid;
  grid-template-columns: minmax(280px, 420px) 1fr;
  gap: 20px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 20px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
}

.panel h2 { margin: 0 0 6px; }
.panel p { margin: 0; color: var(--muted); line-height: 1.45; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  padding: 10px 13px;
  border-radius: 10px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); }
.btn-success:hover { background: var(--success-dark); }
.btn-secondary { background: #374151; }
.btn-secondary:hover { background: #1f2937; }
.btn.disabled {
  pointer-events: none;
  opacity: 0.45;
}

.lista {
  display: grid;
  gap: 12px;
}

.file-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 10px;
}

.file-title {
  font-weight: 800;
  word-break: break-word;
}

.file-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.file-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.estado {
  min-height: 22px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.visor-panel {
  min-height: 720px;
}

iframe {
  width: 100%;
  height: 650px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #f9fafb;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .panel-header { flex-direction: column; }
  iframe { height: 520px; }
}