:root {
  --primary: #2c3e50;
  --secondary: #c0392b;
  --accent: #2980b9;
  --bg: #f4f7f6;
  --text: #333;
  --white: #ffffff;
}

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

body {
  font-family: 'Open Sans', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: var(--primary);
  color: var(--white);
  padding: 2rem 1rem;
  text-align: center;
  border-bottom: 5px solid var(--secondary);
}

.container {
  display: grid;
  grid-template-columns: 250px 1fr 200px;
  gap: 20px;
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 15px;
}

nav {
  background: var(--white);
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  height: fit-content;
}

nav h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--primary);
  border-bottom: 2px solid var(--bg);
  padding-bottom: 5px;
}

nav ul {
  list-style: none;
}

nav ul li {
  margin-bottom: 12px;
}

nav ul li a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.9rem;
  transition: 0.3s;
}

nav ul li a:hover {
  color: var(--secondary);
  font-weight: bold;
}

main {
  background: var(--white);
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1 {
  color: var(--secondary);
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
  text-transform: uppercase;
  border-left: 4px solid var(--secondary);
  padding-left: 15px;
}

.info-box {
  background: #e1f5fe;
  padding: 15px;
  border-left: 5px solid var(--accent);
  margin-bottom: 25px;
  font-size: 0.85rem;
}

.expediente-card {
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  transition: all 0.2s ease;
  position: relative;
}

.expediente-card:hover {
  border-color: var(--accent);
  background: #fafafa;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

.expediente-card h2 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.expediente-card p {
  font-size: 0.9rem;
  margin-bottom: 10px;
  color: #555;
}

.status-badge {
  display: inline-block;
  background: #27ae60;
  color: white;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.7rem;
  text-transform: uppercase;
  font-weight: bold;
  margin-bottom: 10px;
}

.dates {
  font-size: 0.85rem;
  padding: 10px;
  background: #f9f9f9;
  border-radius: 4px;
  margin: 10px 0;
  border: 1px dashed #ccc;
}

.dates strong {
  color: var(--secondary);
}

.links-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 15px;
}

.btn-download {
  background: var(--accent);
  color: white;
  padding: 6px 12px;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.8rem;
  transition: 0.3s;
}

.btn-download:hover {
  background: var(--primary);
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.sidebar-links img {
  width: 100%;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

@media (max-width: 900px) {
  .container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  nav {
    order: 2;
  }
}

@media (max-width: 900px) {
  main {
    order: 1;
  }
}

@media (max-width: 900px) {
  .sidebar-links {
    order: 3;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 900px) {
  .sidebar-links a {
    width: 45%;
  }
}