:root {
    --primary-color: #ac63f1;
    --primary-dark: #ad46e5;
    --primary-light: #b581f8;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html, body {
    height: 100%;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    color: var(--text-dark);
    line-height: 1.6;
}

/* CONTENEDOR PRINCIPAL */
.contenedor {
    display: flex;
    height: 100vh;
    background-color: var(--bg-light);
}

/* MENU LATERAL */
.menu {
    width: 280px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 30px 0;
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    flex-shrink: 0;
}

.menu h2 {
    padding: 0 20px 30px;
    font-size: 24px;
    font-weight: 700;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.menu ul {
    list-style: none;
}

.menu li {
    padding: 14px 20px;
    margin: 5px 10px;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 15px;
    font-weight: 500;
    display: flex;
    align-items: center;
}

.menu li:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.menu li:active {
    background-color: rgba(255, 255, 255, 0.3);
}

/* CONTENIDO PRINCIPAL */
.contenido {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
    background-color: var(--bg-light);
}

.contenido h1 {
    font-size: 32px;
    color: var(--text-dark);
    margin-bottom: 10px;
    font-weight: 700;
}

.contenido > p {
    color: var(--text-gray);
    font-size: 16px;
    margin-bottom: 30px;
}

.contenido h2 {
    font-size: 28px;
    color: var(--text-dark);
    margin-bottom: 25px;
    font-weight: 700;
}

.contenido h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 600;
}

/* FORMULARIOS */
#formCarrera, #formMateria, #formGrupo {
    background: var(--bg-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

#formCarrera label, #formMateria label, #formGrupo label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-size: 14px;
}

input[type="text"], input[type="number"], input[type="email"], input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--bg-white);
}

input[type="text"]:focus, input[type="number"]:focus, input[type="email"]:focus, input[type="password"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background-color: var(--bg-white);
}

input[type="text"]::placeholder, input[type="number"]::placeholder, input[type="email"]::placeholder, input[type="password"]::placeholder {
    color: var(--text-gray);
}

/* BOTONES */
button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark) 0%, #4338ca 100%);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

button[onclick*="eliminar"] {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
    padding: 8px 16px;
    font-size: 13px;
}

button[onclick*="eliminar"]:hover {
    background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
}

/* TABLAS */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
}

thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

th {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 16px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.3px;
    border-bottom: 2px solid var(--primary-dark);
}

td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-dark);
}

tbody tr {
    transition: var(--transition);
}

tbody tr:hover {
    background-color: #f3f4f6;
    box-shadow: inset 0 0 0 1px var(--border-color);
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr td:first-child {
    font-weight: 600;
    color: var(--primary-color);
}

/* RESPONSIVE DESIGN */
@media (max-width: 1024px) {
    .contenedor {
        flex-direction: column;
        height: auto;
    }
    
    .menu {
        width: 100%;
        padding: 20px 0;
    }
    
    .menu h2 {
        font-size: 20px;
    }
    
    .contenido {
        padding: 25px;
    }
    
    .contenido h1, .contenido h2 {
        font-size: 24px;
    }
}

@media (max-width: 768px) {
    .menu {
        overflow-x: auto;
    }
    
    .menu ul {
        display: flex;
        gap: 10px;
    }
    
    .menu li {
        white-space: nowrap;
        margin: 0;
    }
    
    .contenido {
        padding: 15px;
    }
    
    #formCarrera, #formMateria, #formGrupo {
        padding: 15px;
    }
    
    table {
        font-size: 12px;
    }
    
    th, td {
        padding: 10px 8px;
    }
    
    button {
        padding: 8px 12px;
        font-size: 12px;
    }
}

/* SCROLLBAR PERSONALIZADA */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}