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

body {
    font-family: "Segoe UI", Arial, sans-serif;
    background: #f4f4f4;
    color: #222;
    line-height: 1.5;
    max-width: 1100px;
    margin: auto;
    padding-bottom: 40px;
}

/* ================= CABECERA ================= */
header {
    background: #1a1a1a;
    color: #fff;
    text-align: center;
    padding: 25px 20px;
    border-bottom: 4px solid #00c18a;
}

header h1 {
    font-size: 32px;
    margin-bottom: 15px;
}

header img {
    width: 150px;
    margin-bottom: 20px;
}

/* ================= MENÚ ================= */
nav ul {
    list-style: none;
}

nav li {
    display: inline-block;
    margin: 0 12px;
}

nav a {
    color: white;
    font-weight: bold;
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 6px;
    transition: 0.3s ease;
}

nav a:hover {
    background: #00c18a;
    color: #000;
}

/* ================= TÍTULOS ================= */
main h2 {
    text-align: center;
    margin: 30px 0;
    font-size: 26px;
    color: #222;
}

article h3 {
    background: #00c18a;
    color: #fff;
    padding: 12px;
    font-size: 22px;
    text-align: center;
    border-radius: 6px 6px 0 0;
    margin-bottom: 0;
}

/* ================= ARTÍCULOS ================= */
article {
    background: white;
    margin-bottom: 35px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    overflow: hidden;
    border: 1px solid #dcdcdc;
}

.PieArt {
    padding: 12px;
    background: #fafafa;
    border-top: 1px solid #e0e0e0;
    font-weight: bold;
    text-align: center;
}

/* ================= TABLAS ================= */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0;
}

thead th {
    background: #333;
    color: #fff;
    padding: 12px;
    text-align: center;
    font-size: 15px;
}

tbody th {
    background: #e0e0e0;
    font-weight: bold;
    padding: 10px;
    text-align: center;
}

td {
    padding: 10px;
    text-align: center;
    background: #fff;
    border: 1px solid #ddd;
}

/* Alternancia de filas */
tbody tr:nth-child(even) td {
    background: #f7f7f7;
}

/* Celdas ocupadas por asignaturas */
td strong {
    font-size: 16px;
    color: #00695c;
}

td i {
    color: #444;
    font-size: 14px;
}

/* Mejorar apariencia de abbr */
abbr {
    text-decoration: none;
    border-bottom: 1px dashed #999;
    cursor: help;
}

/* ================= PIE DE PÁGINA ================= */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 25px;
    background: #1a1a1a;
    color: #fff;
    border-top: 4px solid #00c18a;
}

footer table {
    width: 80%;
    margin: 15px auto;
}

footer th {
    background: #00c18a;
    padding: 10px;
}

footer td {
    background: #f5f5f5;
    color: #000;
}

footer a {
    color: #00c18a;
    text-decoration: none;
    font-weight: bold;
}

footer i {
    font-size: 30px;
    margin-top: 15px;
}

footer p {
    margin: 10px 0;
}

footer time {
    color: #00c18a;
    font-weight: bold;
}