.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-primary {
    color: #fff;
    background-color: var(--primary);
    border-color: var(--primary);
}

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

.btn-secondary {
    color: #fff;
    background-color: var(--gray);
    border-color: var(--gray);
}

.btn-success {
    color: #fff;
    background-color: var(--success);
    border-color: var(--success);
}

.btn-danger {
    color: #fff;
    background-color: var(--danger);
    border-color: var(--danger);
}

.btn-warning {
    color: #fff;
    background-color: var(--warning);
    border-color: var(--warning);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.5rem 1rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

.card {
    position: relative;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, .125);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.card-header {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid rgba(0, 0, 0, .125);
    background-color: rgba(0, 0, 0, .03);
    border-top-left-radius: calc(var(--border-radius) - 1px);
    border-top-right-radius: calc(var(--border-radius) - 1px);
}

.card-body {
    padding: 1.25rem;
}

.card-title {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    font-weight: 500;
}

.card-text {
    margin-bottom: 0;
}

.form-group {
    margin-bottom: 1rem;
    margin-left: 12px;
    margin-right: 12px;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--dark);
    background-color: #fff;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-control:focus {
    border-color: #86b7fe;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-control.is-invalid {
    border-color: var(--danger);
}

.invalid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875em;
    color: var(--danger);
}

.alert {
    position: relative;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-dialog {
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 500;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: auto;
}

.modal-body {
    padding: 1.25rem;
}

.badge {
    display: inline-block;
    padding: 0.375em 0.75em;
    font-size: 0.75em;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.25rem;
}

.bg-success {
    background-color: var(--success) !important;
    color: white;
}

.bg-warning {
    background-color: var(--warning) !important;
    color: black;
}

.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-primary {
    color: #fff;
    background-color: var(--primary);
    border-color: var(--primary);
}

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

.btn-secondary {
    color: #fff;
    background-color: var(--gray);
    border-color: var(--gray);
}

.btn-success {
    color: #fff;
    background-color: var(--success);
    border-color: var(--success);
}

.btn-danger {
    color: #fff;
    background-color: var(--danger);
    border-color: var(--danger);
}

.btn-warning {
    color: #fff;
    background-color: var(--warning);
    border-color: var(--warning);
}

.btn-info {
    color: #fff;
    background-color: var(--info);
    border-color: var(--info);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.5rem 1rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

.card {
    position: relative;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, .125);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.card-header {
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid rgba(0, 0, 0, .125);
    background-color: rgba(0, 0, 0, .03);
    border-top-left-radius: calc(var(--border-radius) - 1px);
    border-top-right-radius: calc(var(--border-radius) - 1px);
}

.card-body {
    padding: 1.25rem;
}

.card-title {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    font-weight: 500;
}

.card-text {
    margin-bottom: 0;
}

.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--dark);
    background-color: #fff;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-control:focus {
    border-color: #86b7fe;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-control.is-invalid {
    border-color: var(--danger);
}

.invalid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875em;
    color: var(--danger);
}

.alert {
    position: relative;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-dialog {
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 500;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: auto;
}

.modal-body {
    padding: 1.25rem;
}

.badge {
    display: inline-block;
    padding: 0.375em 0.75em;
    font-size: 0.75em;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.25rem;
}

.bg-success {
    background-color: var(--success) !important;
    color: white;
}

.bg-warning {
    background-color: var(--warning) !important;
    color: black;
}

.bg-danger {
    background-color: var(--danger) !important;
    color: white;
}

.bg-info {
    background-color: var(--info) !important;
    color: white;
}

.form-control-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    line-height: 1.5;
}

.ejercicio-row {
    border-left: 3px solid var(--primary);
}

.ejercicio-row:hover {
    background-color: #f8f9fa;
}

textarea.form-control {
    resize: vertical;
    min-height: 60px;
}

ul,
li {
    margin-left: 16px;
}